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Abstract
To enhance the reliability of long wireless link, a relay is placed between transmitter and receiver which break the link into two parts: transmitter to relay called 1st hop and relay to receiver called 2nd hop; such arrangement is called two hop wireless links. In two-hop wireless communication sometimes 1st and 2nd hops are affected by different types of fading called asymmetric fading environment. In this paper we consider four different combinations of Rayleigh and Nakagami-m fading on 1st and 2nd hop to observe the profile of combined pdf (probability density function) and cdf (cumulative distribution function). With the help of cdf we determine the variation of outage probability of mixed fading. Finally we plot the SER (symbol error rate) against the SNR (signal to noise ratio) of the 2nd hop for all possible combinations of the two fading taking the SNR of 1st hop as a parameter. Although recent literature deals with asymmetric fading environment but in this paper instead of details statistical model of such fading we provide the relative scenario of mixed fading on 2-hop wireless link.
Highlights
Performance of wireless communication suffers from different fading effects and these effects can be reduced by using multiple-input multiple-output (MIMO), or relayed transmission technique
The variation of combined cdf and pdf against the instantaneous signal to noise ratio (SNR) are shown in Figures 1-4 taking average SNR of the 1st hop and the 2nd hop as a parameter
Both cdf and pdf are found stepper for lower values of SNR-1 and SNR-2 for all the four combinations of fading
Summary
Performance of wireless communication suffers from different fading effects and these effects can be reduced by using multiple-input multiple-output (MIMO), or relayed transmission technique. This leads to a great research interest in the MIMO and the relayed communications techniques. On the accessibility of instantaneous channel sate information (CSI) at the relay node, AF relaying scheme is generally categorized into two parts, one is variable-gain relaying [2] and the other is fixed gain AF relaying [3] In such communication networks, the signal may be affected by different types of fading. In practical scenario, relay network may have line of sight (LOS) communication from source to destination and multipath communication from relay to destination and vice versa
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