Title: A combining technique based on channel shortening equalisation for ultra wideband cooperative systems
Authors: Asma Ouardas; Sid Ahmed Elahmar
Addresses: TTNS Laboratory, Department of Telecommunication, University of Djillali Liabès, 22000 Sidi Bel Abbes, Algeria ' TTNS Laboratory, Department of Telecommunication, University of Djillali Liabès, 22000 Sidi Bel Abbes, Algeria
Abstract: This paper presents a novel combining technique based on the channel shortening approach for cooperative diversity in the context of time hopping ultra wideband (TH-UWB) systems. Since UWB channel has very long impulse response, TH-UWB performances are affected by inter-symbol interference (ISI). Therefore, the use of the rake diversity combining is very effective, but it increases the receiver complexity due to its large number of correlations. The idea is to introduce a channel shortening equaliser (CSE) before the rake reception in first and second time slots at the relay and destination, respectively. The decode and forward (DF) is used as a relay protocol to retransmit signals and the relay is supposed equipped with multiple antennas and antenna selection criterion is used to exploit the diversity. Numerical results show that significant improvement in the BER is obtained by our proposed structure comparing to cases where the relay is equipped with a single antenna and multiple antennas (full diversity).
Keywords: time hopping ultra wideband; TH-UWB; rake receiver; cooperative diversity; antenna selection; decode-and-forward; channel shortening equaliser; CSE; inter-symbol interference; ISI; full diversity.
International Journal of Computer Aided Engineering and Technology, 2020 Vol.12 No.2, pp.219 - 236
Received: 24 Apr 2017
Accepted: 02 Oct 2017
Published online: 17 Jan 2020 *