INVESTIGATION OF RADIO FREQUENCY LICENSED SPECTRUM UTILIZATION IN NIGERIA: A STUDY OF RUMUOKWUTA, PORT HARCOURT, NIGERIA

International Journal of Wireless & Mobile Networks (IJWMN), Vol.13, No.5, October 2021
DOI:10.5121/ijwmn.2021.13503 31
INVESTIGATION OF RADIO FREQUENCY LICENSED
SPECTRUM UTILIZATION IN NIGERIA: A STUDY OF
RUMUOKWUTA, PORT HARCOURT, NIGERIA
Nkwachukwu Chukwuchekwa, Enwume Joshua U,
Longinus S. Ezema and Cosmas K Agubor
Department of Electrical and Electronic Engineering, School of Engineering and
Engineering Technology, Federal University of Technology, Owerri, Nigeria
ABSTRACT
This study was carried out to investigate the spectrum utilization of the licensed Radio Frequency (RF)
spectrum in Rumuokwuta, Port Harcourt. An outdoor measurement of spectrum occupancy was carried out
in a high-rise building situated at Rumuokwuta urban area in Port Harcourt, Nigeria using RF explorer
spectrum analyzer and a personal computer laptop system. Spectrum activities in the band of 240-960 MHz
were monitored for 24 hours. The frequency band was subdivided into 24 sub bands each with a span size
of 30 MHz. Scanning of bands was made efficient using a python script that scans a range, analyzed the
frequencies and signal strengths for 112 data points, saves data in CSV file format, scans the next range
until the 24 ranges were scanned. The process was repeated to achieve 15 iterations. With a noise floor of -
110dBm, a threshold of -95dBm was used to determine the presence of signal, hence the spectrum
occupancy of measured bands. Results showed that out of the 24 investigated sub bands; only one band
was completely occupied with spectrum occupancy of 100%. 12 bands were partially occupied while 11
were completely free. The average spectrum occupancy for the whole band was obtained as 11.64%. This
showed good location for dynamic spectrum access and cognitive radio deployment, especially in
Television White Space (TVWS).
KEYWORDS
Cognitive radio, Dynamic spectrum access, RF spectrum, TV white space & Wireless communication.
1. INTRODUCTION
The Radio Frequency (RF) spectrum is a natural scarce resource that requires optimum
utilization. It is that portion of electromagnetic spectrum which ranges from 3 Hz to 300 GHz that
is used for communication purposes [1]. The enormous pressure on it has caused significant
scarcity on the availability of the RF resource [2][3][4]. Spectrum occupancy measurement
carried out in various parts of the world showed underutilization of the resource [5][6][7] in the
frequency range of 2.4-2.7 GHz The locations cut across rural, suburban and urban areas. From
their investigations, rural locations have the least duty cycle of approximately 0%. This is
apparently due to very small or no wireless connectivity. The result showed absolute unoccupied
bands. The occupancy levels for suburban regions were better compared to the rural locations.
The urban locations have the highest occupancy level.
As the very first occupancy measurement campaign in Nigeria, [8] considered an insight into
spectrum occupancy in Nigeria. The objective of the study was to carry out an indoor spectrum
occupancy measurement within the region of 0.7 GHz to 2.5 GHz in Gwarimpa, Abuja, Nigeria.

32
Each band was studied for 12 hours daily; from 9am to 9pm. An Aarona spectrum analyzer and
Omnilog 90200 antenna with a frequency range of 0.7-2.5 GHz were used in the measurement. A
decision threshold of -76dBm was used to determine the active and idle states of a licensed user.
The measurement showed that the cellular bands have the highest degree of utilization at 26%
and 25.56% for the 2G and 3G cellular standards respectively. 2-2.2 GHz band has the least
utilization level. As expected, the result showed spectrum white space that could be exploited
through cognitive radio.
The Radio Frequency (RF) spectrum is a natural scarce resource that requires optimum utilization
[1]. However, to optimize the scarce resources, spectrum sharing through adaptive power
allotment has been proposed by many authors. This is a way forward in achieving spectrum
optimization. Cognitive radio network allows primary and secondary resource user to share the
same frequency band while ensuring minimal interference [9][10][11]. The TVWS network can
be made to share the spectrum as a secondary user to provide internet services.
2. REVIEW OF LITERATURES
In recent years, spectrum management has been a major concern for researchers. This is due to
the rising demand for wireless connectivity. The astronomical growth in number of mobile
subscribers, as well as the high demand for multimedia access spurs interest in querying the
efficiency of present radio frequency management. The command and control method of
spectrum management has shown to be ineffective. Researches on spectrum management showed
that high proportion of assigned radio frequency band is unused. The spectrum usage of licensed
radio spectrum varied from 15% to 85% in the United States of America [12]. This conventional
system of spectrum management would need to be replaced by a more intelligent system that
accesses the spectrum dynamically.
Dynamic Spectrum Access (DSA) is basically the process and system of accessing spectrum
white space of a licensed user referred to as Primary User (PU) by an opportunistic user known as
the Secondary User (SU). The idea of Cognitive Radio (CR) was first presented in [13]. Mitola
analyzed CR as a radio that is aware of its environment and can adjust its parameters to respond
to environmental changes. For safe deployment of CR without harmful interference and
infringement on the right of the licensed user, it is therefore necessary to have the knowledge
about the degree of utilization of a particular band to ascertain which band(s) would be suitable
for DSA.
2.1. Traditional Spectrum Management System
Spectrum is a finite resource and therefore its continuous use depends on how efficiently
spectrum bandwidth is used within a given portion of the radio spectrum and geographical
location. Traditionally, the spectrum management system is a command and control approach
where a user has an exclusive right to operate within a certain band. This is to ensure that the
activities of spectrum users are devoid of interference. The spectrum management system has
been in existence for several years since licensing became part of spectrum resource control[14].
It has been a wide practiced system by every spectrum administrator as well as management
authorities. In this management approach, a spectrum manager outlined certain rules and
constraints that determine how, where and when spectrum can be used, as well as who has access
to the resource. In this management model, different services are sometimes allocated to different
frequency bands, although for some frequency bands, more than a radio service is allocated. The
traditional spectrum management system is a hierarchical management system with International
Telecommunication Union (ITU) at top hierarchy. ITU oversees radio spectrum management

33
internationally and ensures compliance at the national level. The next in hierarchy is the national
planning process and down to licensing and interference management. Basically, the traditional
management system uses three managerial tools which include spectrum allocation, spectrum
assignment and interference management.
2.2. Dynamic Spectrum Management System
The limitations of the traditional fixed management system are enough to embrace a system that
would access spectrum dynamically [2]. The old spectrum management system does not consider
spectrum white space and as such renders the system ineffective. The dynamic spectrum
management system is a proposed spectral management system that relies on dynamic spectrum
access which showed the dependent of spectrum on location, time, measurement conditions, and
equipment [15]. Dynamic spectrum management system births dynamic spectrum access which is
a recent spectrum sharing paradigm in which a licensed user, otherwise known as Primary User
(PU) shares the licensed band with an opportunistic user known as the Secondary User [16][17].
With DSA, SUs search for the spectrum bands dynamically, and temporarily access them for
wireless communications. To avoid interference to PUs, SUs continuously monitor the spectrum
bands and yield to PUs whenever the latter start using the band [18].
2.3. Spectrum Sensing
Spectrum is a limited wireless communication resource, and licensed spectrum can only be used
by the paid company owners. Cognitive radio (CR) is a new model of using a licensed spectrum
when not use in an unlicensed manner [19]. The motivation for cognitive radio is to carry out
analyses of various spectrum or channel utilization to detect vacant and occupied spectrum. It
immediately switches to the vacant spectrum while avoiding the licensed occupied spectrum
thereby avoiding interference with the licensed channel. To ensure interference free, the
secondary user must keep monitoring the primary user and be able to sense weak PU signals. The
Cognitive radio should be able to switch to another available channel on sensing PU signal in
occupied channel [20].
Spectrum sensing is a key component of DSA. Sensing is so important that a slight neglect in the
process of DSA could cause huge effect to the PU. For a SU to transmit there would be need to
sense the spectral environment of the PU. Sensing ensures adequate white space before the SU
can share the spectrum band with the PU.Spectrum sensing could be implemented locally or
could be carried out via cooperative sensing. Sensing is done locally if and only if a SU senses
the spectrum environment independently and selects an unused band.
In order to improve sensing by providing accurate detection technique, as well as combating
fading, shadowing and other channel impairments, cooperative sensing has been proposed in this
study. Cooperative sensing improves accuracy in detection through cooperation among SUs,
hence the name [21].
2.4. Reviewed Work
In [22], the authors focused on evaluation of spectrum usage for GSM band in indoor and outdoor
scenarios for dynamic spectrum access. They presented the current spectrum usage of GSM band
in Pune, India. A fibre optic cable was used as an interface between a Rohde and Schwarz
spectrum analyzer and a Dell laptop computer. A 0.7-3 GHz band AOR DA 500 antenna was
used in the campaign. Four different scenarios were considered. The first scenario was an outdoor
measurement taken in suburban India. The second case scenario was an indoor measurement
carried out in outskirts of the city of Pune, India. The third and fourth scenarios were conducted

34
in the busy places of Pune. Results and analysis showed that though there is an underutilization
for both uplink and downlink frequencies for GSM900 and GSM1800, the downlink band
occupancy is higher than uplink band occupancy.
The authors in [23] conducted spectrum investigation for TV white space In the band of 240-960
MHz. Part of the investigation were carried out in suburban Hall of Mercy, FUTO, Owerri;
Obinze; while the rest were carried out in two different locations of Oweri metropolis. With a
noise floor of -110dBm, they chose -95dBm as a suitable threshold. The measurement was done
outdoor in four different locations. The result of their investigation showed that 7.8% of the
spectrum was fully occupied, 31.5% was moderately occupied while 60.7% was unoccupied.
Obviously the result showed high percentage of unused spectral portion which will be a
promising band for cognitive radio deployment. However, their investigation lacks automation of
frequency scan, as a result; it requires manual changing of frequency range which could have
caused measurement error.
Spectrum occupancy measurement in the frequency range of 2.4-2.7 GHz in nine various
locations in Kwara State of Nigeria for 12 hours were carried out in [24]. The locations cut across
rural, suburban and urban areas. From their investigations, rural locations have the least duty
cycle of approximately 0%. This is apparently due to very small or no wireless connectivity. The
result showed absolute unoccupied bands. The occupancy levels for suburban regions were better
compared to the rural locations. The urban locations have the highest occupancy level. For duty
cycles of 0.08% and 0.95% for suburban locations and 18.56% and 22.56% for urban locations, it
is crystal clear that the radio frequency spectrum bands used in those locations are highly
underutilized. The result showed good environment for cognitive radio technology. The
measurements were done in so many locations, nevertheless, it were not done for a long period of
time.
In [25], the authors carried out a survey on the availability of TV white spaces in Eastern Nigeria.
The measurement was done in the analog television band of the UHF using a resolution
bandwidth of 20 KHz. The ambient noise of their spectrum analysis was measured as -100dBm
with a flat average noise level of - 114dBm and frequency range of 100 MHz. They investigated
the TV white space in two different locations of Eastern Nigeria. Results showed that the spectral
usage of the UHF frequency band within the study region is 32%. Again, the result, which is not
different from other campaigns, is a good location for dynamic spectrum access. While the
graphical representation of the TV white space was clearly presented, the research lacks clear
methodology as evident in the Resolution Bandwidth (RBW) of 20 KHz which does not conform
to the 100 MHz frequency range.
A new paradigm of converting radio spectrum wastage to wealth was proposed in [26]. Analysis
of spectrum occupancy verification in three different urban cities of Nigeria was carried out. The
investigation was done in the spectral range of 80-2200 MHz. The locations considered are Ado-
Ekiti, Akure and Ikeja, which are the capitals of Ekiti, Ondo and Lagos state respectively. The
three western Nigerian states were chosen due to population density, industrial activities and
socio-economic developments. Their verification showed variation in the usage of each
frequency band with location. It also showed that though a specific frequency is much more
utilized in a particular location, it is underutilized in a different location. The results generally
showed that the total spectrum occupancy for the three locations ranges from 0.08%-64.4%. The
limitation of this work is the use of very high average threshold of 70.64 in Ado-Ekiti
measurement location.
It is obvious from the aforementioned section that spectrum occupancy measurement is rich in
literature. However, there are noticeable gaps in the measurement of spectrum occupancy. None

35
of these works considered several measurement iterations to obtain the mean (actual) value of
spectrum occupancy. Again, some of the work done has high resolution bandwidth as adjacent
frequencies could hardly be resolved. While this research work seeks to provide spectral
activities in Port Harcourt, Rivers State, Nigeria, it also aims to breach other research gaps in
spectrum occupancy measurement
This research aims to investigate for the first time the level of spectrum usage within the band of
240 MHz to 960 MHz in Rumuokwuta, Port Harcourt, Rivers State, Nigeria, using RF Explorer
and efficient python script. Unlike previous work, the spectrum activities were monitored for
24hours instead of 12hours. This is full day coverage. The Rumuokwuta area of the state was
considered because the population and the high level of commercial activities. In this area, there
are no commensurate available and low cost quality internet services to match the demand.
Therefore, result of this research will aid in the deployment of TVWS for internet provision in the
rural and suburban areas of the state.
3. METHODOLOGY
The methods adopted in this work are discussed in the following sections.
3.1. Conducting Spectrum Occupancy Measurements for Outdoor Scenario
The spectrum occupancy measurements were done outdoor in a high rise building in a residential
apartment in Rumuokwuta, Port Harcourt, Rivers State, Nigeria using RF Explorer spectrum
analyzer, python script and personal laptop computer. This site is positioned at latitude
N4o48’36” and longitude 6o55’12”. Port Harcourt, with an estimated population of 1,865,000 is
a densely populated city with various commercial activities in southern Nigeria. The location site
has direct line of sight with several telecommunication systems, sub systems and base stations.
The site was strategically chosen, being an urban setting with obvious high level of wireless
connectivity. This location being in direct line of sight with various transmitters ensures
measurements of signals that have suffered little or no form of channel impairments. The ambient
noise of the spectrum analyser was determined and a threshold value of -95dBm was gotten based
on noise floor.
For additional functionality of the RF Explorer spectrum analyzer, as well as efficient, broader,
automatic and quality display of the spectrum analysis, a Dell laptop computer was connected to
the spectrum analyzer with a USB cord as an interface. The system enables wider view of
spectrum environment, data capturing/saving, automation of tasks and additional features and
programmability. The experimental setup for data measurement and aggregation is as shown in
Fig. 1.
Fig. 1. Measurement setup

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Installed in the PC is python programming, version 3.5.0. The software is responsible for
automation. The RF explorer spectrum analyzer is designed to be configured manually, with a
maximum scanning range of 100 MHz. This limitation means a script is needed to repeatedly
scan the spectrum from 240 to 960 MHz for 24 hours.The 24 frequency bands analyzed in this
work are 240-270MHz, 270-300MHz, 300-330MHz, 330-360MHz, 360-390MHz, 390-420MHz,
420-450MHz, 450-480MHz, 480-510MHz, 510-540MHz, 540-570MHz, 570-600MHz, 600-
630MHz, 630-660MHz, 660-690MHz, 690-720MHz, 720-750MHz, 750-780MHz, 780-810MHz,
810-840MHz, 840-870MHz, 870-900MHz, 900-930MHz and 930-960MHz.
The step by step procedure or the algorithm designed to perform scanning, analysis and data
aggregation is outlined below.
1. Import modules from python 3.5.0 library.
2. Initialize global and local variables.
3. While WholeDay < (Iteration×24); continue; else; Go To 26.
4. Define RF Explorer object and sets its properties.
5. Connect system to module using RFEObj.ConnectPort(COMPort,DataRate).
6. Reset RF Explorer using RFEObj.SendCommand(“r”).
7. Wait for reset notification.
8. Wait for unit to stabilize using time.Sleep().
9. Send a request command for RF Explorer configuration.
10. Wait for the arrival of configuration and model details.
11. Process received configuration using RFEObj.ProcessReceivedString(True).
12. Update device configuration with new start, stop and span frequencies
13. While (StopFreq <= MaxStopFreq and StartFreq < StopFreq); continue;
14. Process all received from RF Explorer spectrum analyzer.
15. Save data to appropriate CSV file for a new sweep and start frequencies.
16. Set new range of frequencies.
17. If (StopFreq > MaxStopFreq); StopFreq = MaxStopFreq;
18. If (StartFreq < StopFreq); continue; else; Go To 21.
19. Update device with new settings.
20. Wait for fresh configuration to arrive.
21. Increment RoundOf Data.
22. Print round of saved data on console.
23. If WholeDay < (Iteration×24); time statement.
24. RFEObj.Close(); ##Close port.
25. Wait for the processing of the next round of data.
26. Compute total elapsed time.
Scanning started with the first frequency range and data saved in CSV file format; after which the
next range was scanned until the 24 iterations were completed.Investigation started from 9.00am
on 27-09-2017 to 9.00am on 28-09-2017.For each band, 112 data points were resolved with a
Resolution Bandwidth (RBW) of 268 KHz. Each frequency range with 112 data points was
further subdivided into 8 frequency ranges for efficient computation.Spectrum Resource
Occupancy (SRO) for each range is calculated as in equation 1.
(1)
Where: NOCAT is the Number of Channel Above Threshold and TNMC is the Total Number of
measured Channels

37
3.2. Estimation of Spectrum Utilization Level of the Measured Spectrum
Python script, as discussed in the previous section was employed to manipulate and automatically
change the settings of the digital device. The software changes the range of frequency to be
scanned at uniform time interval. A 112 data points comprising frequencies and corresponding
amplitudes of 24 frequency ranges were dumped in CSV file. The process was repeated until 15
sets of 112 data points were saved in each of the 24 files for 24 hours. The comma separated
value files were latter converted to Microsoft Excel files with .xlsx as the file extension. For a
range of frequencies with 268 KHz as resolution bandwidths, 15 columns, each with 112
amplitudes with corresponding frequencies were entered in excel worksheet. The tool allows the
computation of average amplitude in dBm which gives the mean amplitude for each sweep step.
The average values of the signal strength were further segmented for efficient computation. Each
segment consists of 14 sweep steps, which give rise to a total of 8 segments. The tool compares
these values with the threshold value to determine the extent of spectrum usage. Plots of
Spectrum Resource Occupancy versus frequency band were obtained. For more visualization of
spectrum usage level, various degrees of spectrum usage were shown with the use of a pie chart.
3.3. Identification of Potential Bands Suitable for CR
The tool used for identifying potential frequency bands suitable for cognitive radio deployment is
the Microsoft Excel 2016. By combining excel efficient functions, amplitude returned values
were compared with threshold value to estimate the percentage of occupancy for each frequency
range. To identify bands that could be accessed using cognitive radio, a threshold of 45% was
used. Percentage values less than or equal to 45% would be ideal bands for dynamic spectrum
access.
4. RESULTS AND DISCUSSION
Results of various analysis carried out in this work include the results of spectrum occupancy for
24 frequency bands for the range of 240-960MHz. For each band, with a band size of 30MHz, the
results of the mean amplitudes with corresponding Spectrum Resource Occupancy were
tabulated. Plots of Spectrum Resource Occupancy versus frequency range were presented.
Results of spectrum utilization level as well as identified bands suitable for cognitive radio were
shown.
The 24 possible bands of 240-960MHz were analyzed and occupancy level presented. From
analysis, 240-270MHz has the highest spectrum occupancy of 100%. For a threshold of -95dBm,
average signal strength of -88.18dBm shows maximum spectral activity within the region 240-
270MHz. The band has decibel maximum value of -85.89dBm and a minimum decibel value of -
91.42dBm.270-300MHz band is second most occupied with 51% occupancy. This band has
average strength of -95.93dBm, with maximum and minimum values of -93.24dBm and -
99.61dBm respectively.480-510MHz band with 47.63% occupancy is another measured band
whose spectrum resource occupancy is close to half of the total spectrum occupancy. The average
signal strength for this band is -101.21dBm with upper limit of -91.08dBm and lower limit of -
113.82dBm.
Aside aforementioned bands, as well as 450-480MHz and 510-540MHz with Average Spectrum
Occupancy (ASO) of 27.50% and 23.25% respectively, every other bands have average
spectrum occupancy of less than 7%. Bands 300-330MHz, 330-360MHz, 360-390MHz, 630-
660MHz, 660-690MHz, 690-720MHz, 720-750MHz, 810-840MHz, 840-870MHz, 870-
900MHz and 900-930MHz have the least spectrum occupancy with ASO of 0% each. The
comparative analysis of the various spectrum occupancies is as shown in Fig. 2. The degree of

38
spectrum usage for the measurement location is shown in table 1.
Figure 2. Comparative Analysis on Spectrum Resource Occupancy for Various Bands
Table 1. Spectrum Utilization Table for 240-960 MHz
S/N Bands (MHz) Mean Amplitude(dBm) Level of Utilization
1 240-270 100.00% Completely utilized
2 270-300 51.00% Partially utilized
3 300-330 0.00% Unutilized
4 330-360 0.00% Unutilized
5 360-390 0.00% Unutilized
14 630-660 0.00% Unutilized
15 660-690 0.00% Unutilized
16 690-720 0.00% Unutilized
17 720-750 0.00% Unutilized
20 810-840 0.00% Unutilized
21 840-870 0.00% Unutilized
22 870-900 0.00% Unutilized
23 900-930 0.00% Unutilized
From table 1, it is clear that unutilized bands are by far greater than completely utilized band. A
band is completely utilized, twelve bands are partially utilized while eleven bands are devoid of
0.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
Spectrum
Resource
Occupancy
Frequency Band(MHz)
240-960 MHz

39
spectral activities. The detailed analysis shows that 4.17% spectrum is completely utilized, 50%
is partially occupied while 45.83% is free. Table 2 and figure 3 show the level of utilization.
Table 2. Percentage Utilization
Utilization Level Percentage Utilization
Complete utilization 4.17%
Partial utilization 50%
Un utilization 45.83%
Figure 3. Percentage Utilization for 240-960 MHz
From table 1, one completely active band and two other fairly occupied bands are out of context
for cognitive radio technology, hence those bands should not be accessed dynamically. Twenty-
one bands have been identified for exploitation via cognitive radio technology. These are 300-
330 MHz, 330-360 MHz, 360-390 MHz, 390-420 MHz, 420-450 MHz, 450-480 MHz, 510-540
MHz, 540-570 MHz, 570-600 MHz, 600-630 MHz, 630-660 MHz, 660-690 MHz, 690-720 MHz,
720-750 MHz, 750-780 MHz, 780-810 MHz, 810-840 MHz, 840-870 MHz, 870-900 MHz and
900-930 MHz.
5. CONCLUSION
Radio frequency spectrum is a useful and finite resource and therefore need efficient
management system for complete utilization. As part of spectrum occupancy measurement
campaign, investigation of spectrum utilization in the frequency band of 240-290 MHz was
carried out in Rumuokwuta axis of Port Harcourt. The spectrum bands utilization was
investigated for 24hours using RF Explorer and efficient python script. Measurements and data
analysis show that the location is a good environment for dynamic spectrum access and
cognitive radio deployment. Spectrum occupancy measurements should indeed be carried out in
every parts of the whole world with sensitive and efficient spectrum detectors.
Spectrum Utilization Level
Complete
utilization
Partial utilization
Un utilization

40
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Occupancy Measurements and Analysis in the 2.4-2.7 GHz Band in Urban and Rural Environments”.
International Journal of Future Computer and Communication, Vol. 5, No.3.2016
[25] E. Atimati, L.S. Ezema, G.N. Ezeh, U.C. Iwuchukwu and C.K. Agubor “A Survey on the
Availability of TV White Spaces in Easter Nigeria”, International of Scientific and Engineering
Research, Volume 6, Issue 12, December 2015.
[26] J. Jide, A. Oluwaseun, O. Ferdinad, O. Olaleye, A. Olufemi, S. M.Ani-Initi and K. Sunday.
“Dynamic Spectrum Access: A New Paradigm of Converting Radio Spectrum Wastage to Wealth.
International Journal of Engineering Technologies, Vol. 2. No. 3, 2016
AUTHOR BIOGRAPHY
Engr. Dr. Nkwachukwu Chukwuchekwa is an Associate Professor in the department of Electrical and
Electronic Engineering (EEE), Federal University of Technology, Owerri (FUTO), Nigeria. He obtained
his Bachelor of Engineering (B.Eng) degree in Electronic and Computer
Engineering from FUTO in 2000. His Master of Engineering degree was obtained in
Communication Engineering from the same University in 2006. Dr. Chukwuchekwa
proceeded to the United Kingdom precisely at Cardiff University where he obtained
his PhD in Electrical Engineering in 2012 using the United Kingdom’s Engineering
and Physical Sciences Research Council (EPSRC) scholarship. He spent the Spring
Semester of 2014 as a Postdoctoral Research Fellow at Massachusetts Institute of
Technology (MIT) USA sponsored by Total E&P, Nigeria National Petrolem Corporation (NNPC) and
Google. He has published many research articles and presented papers at reputable International
conferences in United Kingdom, Czech Republic, Italy, Greece, Poland etc. Dr. Chukwucchekwa is a
registered member of Council for the Regulations of Engineering in Nigeria (COREN), a corporate
member of the Nigerian Society of Engineers (NSE) and a member of Institute of Electrical and Electronic
Engineering (IEEE), USA. He was EEE departmental examination officer for several years and is at
present the Departmental Postgraduate Cordinator. Nkwachukwu enjoys playing football, reading, Internet
browsing, prayer and evangelism.
Longinus Sunday Ezema (Ph.D) is a senior lecturer and passionate student mentor
with about 10 years of postgraduate lecturing and research experience at the
Department of Electrical and Electronic Engineering, Federal University of
Technology, Owerri, Imo State, Nigeria. He received his B. Eng, in Electrical and
Electronic Engineering from the Nnamdi Azikiwe University (NAU), Awka. He
obtained M. Eng in Telecommunication System from Blekinge Institute of
Technology (BTH), Sweden and Ph.D in Electronic Engineering at University of
Nigeria Nsukka (UNN). He is a registered member of Nigerian Society of
Engineers (NSE), and Council for the Regulation of Engineering in Nigeria (COREN).
Cosmas Kemdirim Agubor has a B.Eng in Electrical and Electronic Engineering,
M.Eng in Electronic and Telecommunication Engineering and PhD in
Communication Engineering Technology. He is a registered member of the Nigerian
Society of Engineers (NSE) and the Council for the Regulation of Engineering in
Nigeria (COREN). He was an Engineer with the Nigerian Telecommunications
Limited (NITEL) and rose to the rank of an Assistant Manager. He is now the Head
of the Department of Electronic Engineering, Federal University of Technology,
Owerri, Imo State, Nigeria. He has several publications in both national and
international journals. His research area is in wireless communication with special interest in Antenna
systems.

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INVESTIGATION OF RADIO FREQUENCY LICENSED SPECTRUM UTILIZATION IN NIGERIA: A STUDY OF RUMUOKWUTA, PORT HARCOURT, NIGERIA