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Additional info for Energy Efficient Cooperative Wireless Communication and Networks
As an extension, we are interested in the interference impact on network performance, that is, under a realistic assumption that multiple nodes are active for transmission at the same time. 8) where pI is the summation of interfering power at the receiver. For Rayleigh fading, |aj,si+1 |2 is exponentially distributed with parameter dαj,si+1 . By taking pI , then the average of |aj,si+1 |2 and assuming the white noise power p0 the above SINR is p = SINR ≈ p = pI p = α p/d j,si+1 j 1 . 3 Si+2 Si+1 Si 37 One example of a cooperative route.
6) where SINR is defined as received power-to-noise-plus-interference ratio and xy f (x, y) = x+y+1 . 5), the delay performance of AF can be obtained © 2015 by Taylor & Francis Group, LLC 46 Energy-Efficient Cooperative Wireless Communication and Networks as 2(ρL − ln ) DAF ≥ ρ ln 1 + SINRs,d +f (SINRs,r ,SINRr,d ) 1+ρ . 7) Note that the source and relay transmit an identical codeword in two equal time slots; the extra factor of 2 is added in the delay. 2 Decode-and-Forward Transmission Let ds,d , ds,r , and dr,d be the respective distances among the source, relay, and destination.
From another aspect, the total power consumption can also be reduced by using cooperation. Various cooperative routing algorithms have been developed to further reduce the total transmission power of cooperative transmission [22, 23, 24, 25, 26]. However, most existing cooperative routing algorithms are implemented by identifying a shortest path first, and thus the performance gains of cooperative communication cannot be fully exploited. 1, we propose a power-efficient cooperative routing algorithm as follows.