Delay Optimization in Cooperative Relaying with Cyclic Delay Diversity

— Cooperative relaying has recently been recognized as an alternative to MIMO in a typical multi cellular environment. Inserting random delays at the non-regenerative fixed relays, further improve the system performance. However, random delay results in limited performance gain from multipath diversity. In this paper, two promising delay optimization schemes are introduced for a multi cellular OFDM system with cooperative relaying with stationary multiple users and fixed relays. Both of the schemes basically aim to take the most advantages of the potential frequency selectivity by inserting pre-determined delays at the relays, in order to further improve the system performance (coverage and throughput). Evaluation results for different multipath fading environments show that the system performance with delay optimization increases tremendously compared with the case of random delay.

• Type: Conference
• Year: 2008
• Where: ICC
• Authors: S. Ben Slimane, Xuesong Li, Bo Zhou, Nauroze Syed, Mohammad Abu Dheim
• Keywords: Communications, Delay Optimization, Delay Optimization Schemes, ICC 2008, Random Delay