Ubiquitous Computing and Communication Journal
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Title: Modification of multiple antenna amplified and forward relay over NAKAGAMI FADING CHANNEL
Authors: Dr. Zachaeus Kayode Adeyemo, Dr. Robert OLUWAYIMIKA Abolade, Mr. Olusola Bankole Oladimeji, Mr. Samson Iyanda Ojo
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, long signal delay that results in long processing time and signal distortion. Hence, this paper addresses a Modified Multiple Antenna Amplify and Forward Relay (MMAAFR) over the Nakagami fading channel. MMAAFR model is developed using three fixed gain relays, modified Maximal Ratio Combiner (MRC) at Radio Frequency (RF) stage. The MMAAFR model is incorporated into a system model which consists of transmitter, Nakagami channel and receiver. The transmitter consists of randomly generated data used as source data, encoded and modulated using M-ary Phase Shift Keying (M-PSK) schemes. The modulated signals are then passed through a Nakagami fading channel. The faded signals are received by the three relays. The relays amplify the received signals with a fixed gain and forward the processed version to the modified MRC. The modified MRC combines the received signals. The system model is evaluated using the Outage Probability (OP) which is derived from the received signal using the Probability Density Function (PDF), Bit Error Rate (BER) and Processing Time (PT). The results obtained show that MMAAFR gives lower OP, BER, and PT values than MAAFR. Therefore, the paper shows hardware complexity reduction in MAAFR and MMAAFR can be used in wireless communication by network designer.