Adeyemo Kayode

• B.Eng M.Eng Ph.D
• ladoke akintola university of technology, ogbomoso,oyo state nigeria

Spectrum manufacturers, operators and regulators are faced with the challenge of meeting the astronomical increase in demand by spectrum users due to the limited available radio spectrum already fixed for licensed or Primary Users (PUs). The emergence of Cognitive Radio Network (CRN) allows unlicensed or Secondary Users (SUs) to opportunistically a...

The rapid growth in the mobile industry due to increase in number of users accessing diverse services causes a high demand for radio spectrum. Nonetheless, the radio spectrum allocated for different wireless communication services is restricted. Cooperative Cognitive Radio (CCR) technique with Amplify and Forward (AF) relaying protocol used to addr...

The exponential growth and proliferation of wireless devices for different wireless applications have led to the emergence of cognitive radio network (CRN) for optimal utilization of scarce spectrum resources. However, these resources have grossly been under-utilized due to the inaccurate spectrum predictions. Existing spectrum occupancy and predic...

Noise suppression in speech signal has received great attention in signal processing research community. However, existing methods of noise suppression such as the time-domain Kalman filter suffers from the psychoacoustic and physiological characteristic feature while the spectral subtraction technique performed in the modulation domain is associat...

In Heterogeneous Wireless Networks (HWNs), Radio Access Technologies (RAT) can only consider the situation of one particular Radio Resource Management (RRM) which is unsuitable for managing multiple RATs. This study deployed an adaptive RAT selection scheme model to allocate users to the best RAT with the use of the cost function variable. The adop...

The quality of the signal received at any location in communication channel depends on the degree of losses and attenuation experience along its path. The existing models are not suitable for 5G network propagation due to heavy channel interference and signal loss applicable at millimeter wave (mmWave) spectrum. The issues of Path Loss (PL) and sig...

Prevention of authorized users from interference determine the accurate detection of Spectrum Hole (SH) is of great importance in a Spectrum Shearing Network (SSN). However, multipath fading and shadowing affect the accurate detection of SH resulting in interference. Cluster-Based Cooperative Spectrum Hole Detection (CBCSHD) used to address this pr...

Tropospheric scintillation which causes rapid fluctuation of signal due to the turbulence in the atmosphere is of significance in satellite link budget design. Existing models that predict the intensity of scintillation such as Karasawa, International Telecommunication Union Radiocommunication (ITU-R) Sector, Otung, Van de Kamp and Ortgies are not...

Transmission of high data rate over multipath environment is associated with many wireless applications. However, this transmission results in high delay which leads to ISI distortion and causes high error. The existing LE in MIMO systems such as ZF equalizer used in addressing this problem reduces the ISI distortion completely but results in noise...

Speech enhancement is of paramount importance in improving the intelligibility and audibility of speech signals in an uncontrolled noisy environment over wireless communication systems. However, the existing techniques used to achieve this such as spectral subtraction are characterized by remnant noise or musical note, while Kalman filter which can...

Spectrum Hole Detection (SHD) is a major operation in a Cognitive Radio (CR) network to identify empty spectrum for maximum utilization. However, SHD is often affected by multipath effects resulting in interference. The existing techniques used to address these problems are faced by poor detection rate, long sensing time and bandwidth inefficiency....

Acceptable Quality of Service (QoS) is of paramount importance in wireless communication system. However, QoS is affected by multipath propagation resulting in unreliable reception. Selection Combiner (SC) which is one of the techniques previously used to solve this problem is associated with poor performance due to fixed power level used in the te...

White Space Detection (WSD) is a core operation in a Cognitive Radio System (CRS) to identify idle spectrum for maximum utilization. However, WSD is often affected by multipath effects resulting in poor detection rate. Cooperative WSD (CWSD) which is one of the existing techniques used to address the problem is characterized by long sensing time, e...

5G Ultra-Dense Networks (UDNs) will involve massive deployment of small cells which in turn form complex backhaul network. This backhaul network must be energy efficient for the 5G UDN network to be green. V-band and E-band mmWave technologies are among the wireless backhaul solutions tipped for 5G UDN. In this paper, we have compared the performan...

Ultra-dense network (UDN) is characterized by massive deployment of small cells which resulted into complex backhauling of the cells. This implies that for 5G UDN to be energy efficient, appropriate backhauling solutions must be provided. In this paper, we have evaluated the performance of giga passive optical network (GPON) and V-band millimetre w...

Wireless communication system has found worldwide acceptability in providing acceptable services due to its portability, flexibility and ease of usage. However, the system is characterized by severe multipath propagation effects that degrade its performance. Selection Combiner (SC) as one of the techniques being used to address this problem is asso...

Abstract—The worldwide acceptability of wireless communication is due to its portability and flexibility. However, its performance is governed by the multipath propagation effects which make wireless communication modelling challenging. The existing technique being used to solve this propagation effects is based on Probability Density Function (PDF...

The Weight-Based Pricing System is developed in a way to quantify items in kilograms and give their prices which have been programmed into the system. Some of the existing systems have superimposed noise on useful signal which serves as a constraint in achieving higher accuracy and wastage of energy. Therefore, this paper developed a weight-based p...

1 zkadeyemo, 2 doaborisade, 3 roabolade@yahoo.com} ABSTRACT Satellite communication systems have become an essential part of the world's telecommunications infrastructure, serving millions of people with multimedia services all over the world. The communications are now an accepted fact of everyday life, as evidenced by the antennas or dish that do...

Channel Estimation (CE) in multicarrier system especially in Orthogonal Frequency Division Multiplexing (OFDM) systems has become an important technique in wireless communication to reduce the overall effect of high data rate and increase links performance. In wireless channel, which has frequency selective distribution, the transmitted signals are...

The fastest growing segment of the communication industry is the mobile wireless communication system. However, the systems faced a lot of challenges such as delay in the propagation of signals due to time-varying channel and effect of high speed transmission over Rayleigh fading which result into Inter-Symbol Interference (ISI) distortion. Least M...

Managing attendance in institutions and organizations has become a difficult challenge. The ability to compute attendance becomes a major task as manual computation produces errors, and also wastes a lot of time. Radio-frequency identification (RFID) and Biometrics have been individually used to solve the problem of attendance in recent years. RFID...

Managing attendance in institutions and organizations has become a difficult challenge. The ability to compute attendance becomes a major task as manual computation produces errors, and also wastes a lot of time. Radio-frequency identification (RFID) and Biometrics have been individually used to solve the problem of attendance in recent years. RFID...

This paper presents the performance of adaptive modulation with multiple input multiple output orthogonal space time block coding MIMO-OS TBC over frequency selective Rayleigh fading channel using Bit Error Rate (BER) and spectral efficiency (S E) as performance measures. The increase in demand for communication networks has turned the spectrum int...

Link adaptation is an important strategy for achieving robust wireless multimedia communications based on quality of service (QoS) demand. Scheme switching in multiple-input multiple-output (MIMO) systems is an aspect of link adaptation, and it involves selecting among different MIMO transmission schemes or modes so as to adapt to the varying radio...

Acceptable Quality of Service (QoS) without increasing the transmitter power is of paramount importance in wireless communication system. However, QoS is affected by wireless channel leading to unreliable reception. Multiple Antenna Amplify and Forward Relay (MAAFR) previously used to address this problem, is associated with hardware complexity, lo...

Wireless communication system has a great impact in the world of telecommunication and is expected to be a leading role in the developing a nation. However, the system is characterized by multipath propagation effects that lead to signal fluctuation at the receiver, thereby degrading the performance of the system. Maximal Ratio Combiner (MRC) being...

Wireless communication system is the processing, transmitting and receiving signals over an open space. This system suffers from time varying environment disturbance due to propagation of signals through different paths which prompt the signals to have different statistical distributions. The existing modified diversity combiners diversity such as...

Spectrum sensing is of paramount importance in the Cognitive Radio Network (CRN) due to massive spread of wireless services. However, spectrum sensing in CRN is affected by multipath effects that make detection difficult. Square-Law Combining (SLC) technique, which is one of the methods previously used to address this problem, is associated with ha...

Wireless communication encountered lots of issues in the channel as the signal is being propagated from transmitter to the receiver. The mobile users continue increasing and the quality of service is very poor due to unreliable nature of the channel. There has been signaling fading, attenuation, calls drop, interference, network capacity and signal...

Propagation of signals in wireless communication is the travelling of signals from one location to another without physical connection. In the course of propagating, the signals are susceptible to channel impediments such as obstacles, atmospheric factors which change in unpredictable manner and result in path loss and shadowing. The path loss occu...

Rain height is one of the key parameters in rain attenuation prediction. However, few studies on it had been carried out due to unavailability of data especially over tropics. Presented here is the result of eleven years zero degree isotherm height for eight locations over Malaysia. The studies had been carried out over two main seasons in the coun...

The prediction of the signal strength received at a particular location is of paramount importance in the determination of overall performance of any wireless system. This prediction depends on the propagation path loss between the base stations and the mobile user. Some of the existing propagation path loss models such as Free Space, Okumura, Okum...

The signal strength in any wireless communication system is being governed by the environment. The strength of signal at any location depends on the distance, frequency of transmission and obstacles along the path. This makes the signal strength unpredictable and exact analysis so difficult to obtain in planning of any communication system. Subsequ...

Channel estimation is one of the techniques used to achieve high data rates and low bit error rates in wireless communications. In wireless communication system, where Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) exists, the effect of channel causes the received signal to be distorted which necessitates the...

This paper presents the effect of rician factors in satellite communications with Maximum A Posteriori (MAP) demodulation. Conventional QAM presently in use where the high capacity signaling scheme is required, is characterized with high errors due to the Doppler Effect and the nature of the channel as the order of modulation increases in rician fa...

The increasing demand for multimedia data transmission in mobile wireless communication poses a challenge to reliable signal reception. In order to have good signal quality, a robust digital modulation scheme is required at the transmitter. However, the conventional M-ary Phase Shift Keying (MPSK) commonly used in multiple-input multiple-output (MI...

The increasing demand for multimedia data transmission in mobile wireless communication poses a challenge to reliable signal reception. In order to have good signal quality, a robust digital modulation scheme is required at the transmitter. However, the conventional M-ary Phase Shift Keying (MPSK) commonly used in multiple-input multiple-output (MI...

The increasing demand for multimedia data transmission in mobile wireless communication poses a challenge to reliable signal reception. In order to have good signal quality, a robust digital modulation scheme is required at the transmitter. However, the conventional M-ary Phase Shift Keying (MPSK) commonly used in multiple-input multiple-output (MI...

Transmission of multimedia signals over Rician fading channel in wireless communication is faced with different challenges such as noise, delay and impairment which make the multimedia signal unreliable. The conventional methods such as Automatic Repeat Request (ARQ), Reed Solomon code (RSC) and Forward Error Correction (FEC) which are used in comb...

Data transmission through the internet over the worst channel is increasing everyday due to its convenience. However, hackers interrupt the integrity and availability of the data being transmitted. Conventional method used to combat these challenges such as one-factor authentication is prone to hacking because of its weakest in validating the ident...

Multimedia services are increasing due to necessity of life. As a result, issue of poor quality of services (QOS) and data rate need to be considered for their sustainability. The conventional Multiple Input Multiple Output (MIMO) previously in use can only improve Qos at low data rate while OFDM only reduces data rate. Therefore, this paper aims a...

This paper presents the effect of rician factors in satellite communications with Maximum A Posteriori (MAP) demodulation. Conventional QAM presently in use where the high capacity signaling scheme is required, is characterized with high errors due to the Doppler Effect and the nature of the channel as the order of modulation increases in rician fa...

Signal over fast and frequency selective channel suffers from Doppler and delay effects due to propagation mechanism such as reflection, refraction and diffraction resulting in poor quality reception. Maximal Ratio Combining (MRC) and Adaptive Modulation are some of the techniques previously used to address this problem, but each of these technique...

Mobile satellite communication (MSC) system has become an essential part of the world telecommunication infrastructure. However, it is characterized by multipath fading effects. Equal Gain Combining (EGC) which was one of the techniques previously used to address this problem also suffers from hardware complexity. A modified EGC (mEGC) with single...

Mobile Satellite Communications (MSC) have become an essential part of the world telecommunication infrastructure. However, the systems suffer from multipath propagation effects. In this paper, error analysis of M-ary quadrature amplitude modulation (M-QAM) with Equal Gain Combiner (EGC) over mobile satellite channel was carried out. The satellite...

Mobile Satellite Communications (MSC) have become an essential part of the world telecommunication infrastructure. However, the systems suffer from multipath propagation effects. In this paper, error analysis of M-ary quadrature amplitude modulation (M-QAM) with Equal Gain Combiner (EGC) over mobile satellite channel was carried out. The satellite...

This paper presents a modified maximum Ratio Combiner (MRC) for correcting inter symbol interference (ISI) distortion in mobile wireless channel. Mobile wireless system produces fast frequency selective fading channel which is due to the variation of the channel in such a way that the coherent time will be less than the symbol period of the modulat...

This paper investigates the effect of orthogonal frequency division multiplexing (OFDM) transmission mode on the performance of the cyclic prefix- (CP) based frequency synchronization technique. An OFDM block consists of the inverse fast Fourier transform (IFFT) window and the CP. A transmission mode refers to the IFFT size used for the OFDM symbol...

This paper describes the analysis of multiple input multiple output (MIMO) Beamforming with adaptive modulation using spectral efficiency as a figure of merit in multipath fading environment. Multipath fading environment causes the transmitted signals to be unreliable due to effects of tall buildings, trees, mountains, moving objects and so on. As...

The major drawback of the orthogonal frequency division multiplexing (OFDM) system is high sensitivity to synchronization errors caused by carrier frequency offsets (CFOs), which result in degradation in the bit error rate (BER) performance. This paper investigates the performance of a hybrid fractional carrier frequency offset estimator (FCFOE) fo...

This paper compares the performance of Rayleigh, Rician and Log-normal distributions in mobile wireless transmission system. In these distributions link quality cannot be predicted accurately enough to achieve reliable performance because of the unpredictable nature of the time-varying channel at different mobile speeds in sub-urban environment and...

This paper presents the investigation into the effect of rain on satellite communication link in Nigeria at a frequency of 30 GHz, using six cities in each geographical zone of the country. The annual rainfalls of the cities spanning a period of three years were collected from the Nigerian Meteorological Centre for proper analysis. The ITU-R rain a...

This paper investigates the use of multicarrier system to provide solutions to the net effect of propagation which include atmospheric gases terrestrial obstacles which cause degradation in the link. Orthogonal Frequency Division Multiplexing (OFDM) that is a form of multicarrier transmission strategy. The total transmission bandwidth is split into...

This paper investigates a three-state simulation model for a frequency-selective land mobile satellite communication (LMSC) channel. Aside from ionospheric effects, the propagation channels for LMSC systems are also characterized by wideband effects due to multipath fading which makes the channels time-variant and exhibit frequency-selective distor...

This paper presents the investigation of two transmission schemes with a diversity combining technique over Rayleigh fading channels. Each of Gaussian Minimum Shift Keying (GMSK) and Binary Differential Phase Shift Keying (BDPSK) transmission schemes was considered with a diversity combining technique known as Maximal Ratio Combining (MRC). Rayleig...

With recent increase in the demand for mobile communication services, future generations of mobile systems are expected to provide very high data rate transmissions as well as improved quality of service to users within commercial feasibility so as to avoid poor reception which the users are experiencing nowadays. OFDM which is a form of multicarri...

Mobile wireless communication is the fastest growing segment of the communication industry. However, it is faced with the challenge of providing reliable high-speed communications due to channel impediments which change over time in unpredictable ways. This paper presents a joint decision feedback equalizer and diversity combiner called adaptive di...

Mobile communications have experienced massive growth in recent years. It is also in high demand nowadays. However, these systems suffer from much impairment such as multipath propagation effects and thermal noise. The study investigates the effect of using Binary Phase Shift Keying (BPSK) and Binary Differential Phase Shift Keying (BDPSK) with Max...

Mobile communications have experienced massive growth in recent years. It is also in high demand nowadays. However, these systems suffer from much impairment such as multipath propagation effects and thermal noise. The study investigates the effect of using Binary Phase Shift Keying (BPSK) and Binary Differential Phase Shift Keying (BDPSK) with Max...

In this paper, we study the performance of Binary phase shift keying (BPSK) and Quartenary phase shift keying (QPSK) modulation signalling over fast and frequency non-selective Rayleigh fading channel with mobile digital communication and usually a decision feedback equalizer (DFE) at the receiver. Mobile communication is generally a complex proces...