Title :
Piecewise linear relaying: A low complexity parametric relaying
Author :
Khormuji, Majid N. ; Skoglund, Mikael
Author_Institution :
Sch. of Electr. Eng. & the ACCESS Linnaeus Center, R. Inst. of Technol. (KTH), Stockholm, Sweden
Abstract :
We investigate the Gaussian, three-nodes relay channel with orthogonal receive components, i.e., the transmitted signals from the source and the relay do not interfere with each other. We develop and analyze low-complexity symbol-wise (as opposed to block-wise) relaying strategies based on a one-dimensional, parametric piecewise linear (PL) mapping. We numerically compute and optimize the achievable rates obtained by the PL mapping for a certain number of design parameters. We conclude that optimized PL relaying always outperforms conventional instantaneous linear relaying (amplify-and-forward). We also illustrate that the proposed PL relaying can improve on sophisticated block Markov encoding (i.e., decode-and-forward) when the source-relay link is ill-conditioned (relative to other links). Furthermore, PL relaying can work at rates close to those achieved by side-information encoding (i.e., compress-and-forward), but at a much lower complexity.
Keywords :
Gaussian channels; Markov processes; block codes; channel coding; piecewise linear techniques; block Markov encoding; low complexity parametric relaying; piecewise linear relaying; relay channel; Ad hoc networks; Binary phase shift keying; Decoding; Delay; Design optimization; Frequency; Piecewise linear techniques; Relays; Signal mapping; Wireless sensor networks;
Conference_Titel :
Signal Processing Advances in Wireless Communications, 2009. SPAWC '09. IEEE 10th Workshop on
Conference_Location :
Perugia
Print_ISBN :
978-1-4244-3695-8
Electronic_ISBN :
978-1-4244-3696-5
DOI :
10.1109/SPAWC.2009.5161786