Outage performance of low-latency decode-and-forward cooperative wireless networks

Abstract

In this paper, we study a noise-limited low-latency decode-and-forward cooperative network set in a dynamic environment prone to link blockage. We analyse outage probability (OP) performance considering a temporally correlated fading channel between cooperating nodes employing a threshold-based protocol for internode communication. Exact and asymptotic analytical expressions for OP over Rayleigh fading, when maximal-ratio combining is applied at the destination, are derived. Asymptotic results give a better insight into outage performance at high average signal-to-noise ratio (SNR). We analyse the OP dependence on the SNR and link blockage probability and correlation coefficient of the estimated and actual internode SNR. The results illustrate that the internode protocol improves outage performance in the whole range of average uplink SNR. Internode channel correlation has a significant effect on the OP in the range of low average internode SNR. With increasing correlation, the OP increases up to an order of magnitude. The results also show that link blockage has a dominating effect on OP performance. The finite probability of all internode links being blocked reduces network performance to a single-link scenario, regardless of using the threshold-based protocol.

Outage analysis of clustered cooperative networks in generalized fading and shadowing

“…Performance analysis of DF cooperative wireless networks was performed in [2][3][4][5][6][7][8][9][10][11][12]. Outage probability over Rayleigh and Nakagami-m fading channels was analyzed in [2] and [3], respectively.…”

“…Outage performance and packet error rates in DF networks subject to Rayleigh fading employing repetition schemes to compensate for unsuccessfully decoded packets were analyzed in [7][8][9]. Exact and asymptotic outage behavior of low-latency cooperative networks set in a dynamic environment prone to link blockage, were examined in [10]. The presence of shadowing and its effects on overall network performance was analyzed in [11], and the combined effects of multipath fading and shadowing were addressed in [12].…”

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

“…Each source node monitors the internode channel and applies the threshold-based transmission protocol as seen in [12,13]. At the beginning of its transmission slot, node U i listens to the instantaneous value of the internode SNR, denoted with  i , and compares it to the predetermined transmission threshold  0 .…”

“…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].…”

“…Outage performance of low-latency DF cooperative networks was analyzed in [12,13], where a threshold-based protocol was utilized in the communication between nodes over Rayleigh fading. The protocol was based on monitoring the channel between nodes and sending data in different time periods depending on the estimated value of the instantaneous SNR.…”