Cellular Systems with Non-Regenerative Relaying and Cooperative Base Stations

• Published in: IEEE transactions on wireless communications Vol. 9; no. 8; pp. 2654 - 2663
• Main Authors: Somekh, O, Simeone, O, Poor, H V, Shamai, S
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: amplify and forward; Base stations; Cellular; compress and forward; Decoding; Equations; Focusing; Interference; Interference elimination; Land mobile radio cellular systems; Mathematical models; multicell processing; Non-regenerative relaying; Relay; Relaying; Relays; Signal processing; Stations; Studies; Terminals; Time Division Multiple Access; Time invariant systems; Upper bound
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2010.061710.091603

In this paper, the performance of cellular networks with joint multicell processing and dedicated relay terminals is investigated. It is assumed that each relay terminal is capable of full-duplex operation and receives the transmission of relay terminals in adjacent cells. Focusing on intra-cell time division multiple access and non-fading channels, a simplified relay-aided uplink cellular model is considered. Addressing the achievable per-cell sum-rate, two non-regenerative relaying schemes are considered. Interpreting the received signal at the base stations as the outcome of a two-dimensional linear time invariant system, the multicell processing rate of an amplify-and-forward scheme is derived and shown to decrease with the inter-relay interference level. A novel form of distributed compress-and-forward scheme with decoder side information is then proposed. The corresponding multicell processing rate, which is given as a solution of a simple fixed-point equation, reveals that the compress-and-forward scheme is able to completely eliminate the inter-relay interference, and it approaches a "cut-set-like" upper bound for strong relay terminal transmission power. The benefits of base-station cooperation via multicell processing over the conventional single site processing approach is also demonstrated for both protocols.