In this paper, the outage performance of automatic repeat request (ARQ) based opportunistic relaying is analyzed when the channel state information (CSI) for relay selection is outdated. The outage probability is derived in terms of correlation between SNR and outdated SNR of the channel from the selected relay to destination. It is shown that simulation results of the outage probability match ...

The discrete memoryless state-dependent relay channel (SD-RC) is considered in this study. Two main cases are investigated: SD-RC with non-causal channel state information (CSI) and SD-RC with causal CSI. In each case, the SD-RC with partial CSI at the source and the relay is considered. As special cases it includes three different situations in which perfect CSI is available: (i) only at the s...

We propose a joint network-channel coding scheme for the multiple-access relay channel. In this scenario, two users use a common relay which performs network coding. We show how a distributed Low-Density Parity-Check (LDPC) code can be applied as a joint network-channel code. The network-channel code is described by one single regular Tanner graph and is decoded with the iterative messagepassin...

In this study, compressed channel estimation method for sparse multipath two-way relay networks is investigated. Conventional estimation methods, e.g., Least Square (LS) and Minimum Mean Square Error (MMSE), are based on the dense assumption of relay channel and cannot exploit channel sparsity which has been verified by lots of channel measurements. Unlike the previous methods, we propose a com...

Wireless sensor networks (WSNs) will play a fundamental role in the realization of Internet of Things and Industry 4.0. Arising from the presence of spatially distributed sensor nodes in a sensor network, cooperative diversity can be achieved by using the sensor nodes between a given source-destination pair as intermediate relay stations. In this paper, we investigate the end-to-end average bit...

This report summarize some results from [1, 2, 3] in multiple-access channel (MAC) with user cooperative diversity. Also, a brief discussion over the relationship between this model and other channels, (e.g. MAC with feedback, relay channel), is presented and expected to inspire further discussion on the class as well as help to gain some insight over this particular model.

In this article, we propose multiple-relay selection schemes for multiple source nodes in amplify-and-forward wireless relay networks based on the sum capacity maximization criterion. Both optimal and sub-optimal relay selection criteria are discussed, considering that sub-optimal approaches demonstrate advantages in reduced computational complexity. Using semi-definite programming convex optim...

In this chapter, a cooperative broadband relay-based resource allocation technique is proposed for adaptive bit and power loading multiple-input-multiple-output/orthogonal frequency division multiplexing (MIMO-OFDM) system. In this technique, sub-channels allocation, M-QAM modulation order, and power distribution among different sub-channels in the relay-based MIMO-OFDM system are jointly optim...