Abstract
The performance of cooperative network can be increased by using relay selection technique. Therefore, interest in relay selection is sloping upward. We proposed two new relay selection schemes based on fuzzy logic for dual hop cooperative communication. These relay selection schemes require SNR (signal to noise ratio), cooperative gain and channel gain as input fuzzy parameters for selection of best relay. The performance of first proposed relay selection scheme is evaluated in term of BER (bit error rate) in Nakagami, Rician and Rayleigh fading channels. In second proposed relay selection scheme, threshold is used with the objective to minimize the power consumption and channel estimation load. Its performance is analyzed in term of BER, number of active relays and load of number of channel estimations.
Highlights
In future wireless communication networks, multipath fading is the key problem to achieve high data rate
Channel estimation load i.e. number of relays whose path coefficients are taken into account, is reduced, no need to turn ON all the relays, time for relay selection is reduced and calculations for all the relays is reduced
Our simulation result proved that number of channel estimations and number of active relays increases as the threshold increases
Summary
In future wireless communication networks, multipath fading is the key problem to achieve high data rate. More than one relays are present and use of all relays will leads to interference with the sources, high power consumption and consuming high bandwidth For covering up this problem a relay with better specifications and according to the requirements of the application is chosen which forwards the signal from source to destination. To the best of our knowledge, the discussed relay selection techniques are causing enormous control message overhead because of repeatedly relay selection for cooperation, when successive data transmission is carried out especially in case of audio or video session occurring between source and destination, causing degradation in network performance. To reduce the frequent selection of relays we propose two algorithms based on local channel state (CSI) information available with the use of fuzzy logic algorithm for computational complexity and control message overhead reduction while promising for selection of best relay and guaranteeing betterment in symbol error rate.
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