Exact and Asymptotic Outage Probability Analysis for Decode-and-Forward Networks

Abstract

We consider decode-and-forward cooperative networks and we derive analytical expressions as well as tractable asymptotic approximations for the outage probability of a network node. Our analysis sheds more light on the interplay between the channel conditions, the network size and the adopted transmission scheme, and provides a useful tool for the design of cooperative networks.

Outage Analysis of Low-Latency Cooperative Wireless Networks With Threshold-Based Protocol Over Composite Fading

“…Similarly, when cooperation is dropped and nodes act selfishly, resending their own packets, denoted with "self", there exists only one independent transmission path, but since a node sends its data packet a total of M times, those transmissions are viewed as a single transmission with M times the power [8,9]. The resulting expression for OP has the form self 2,1 0 0 1,3…”

“…The decoding and outage threshold are set to  0 = -0.441 dB, which accounts for convolutional coded data packets, length of 512 bits [9]. The impact of shadowing severity is shown in Fig.…”

“…In the past decade, extensive literature on the topic of cooperative communications can be found [1][2][3][4][5][6][7][8][9][10][11][12][13]. Laneman et al gave the mathematical framework for energy-efficient multiple-access cooperative strategies in [1].…”

“…Chatzigeorgiou et al have introduced repetition schemes over Rayleigh fading in their works regarding DF schemes, ensuring the destination will always receive the same amount of data per source node [8,9]. In [8], in the high SNR regime, all nodes relayed data to the destination if the channel between nodes was reliable and decoding was possible at all relays.…”

“…However, if the channel between nodes was poor, cooperation was dropped and every node re-sent its own data packets to the destination. In [9], the same authors improved the repetition protocol, and only those packets which are not successfully decoded were resent. These repetition protocols were further expanded in [10], where the network was subject to Nakagami-m fading, while in [11] the effects of unequal SNR and temporary node blockage were taken into account.…”