Novel non‐coherent and half‐coherent receivers for amplify‐and‐forward relaying. Issue 4 (6th November 2014)

• Record Type: Journal Article
• Authors: Khan, Fahd Ahmed; Chen, Yunfei; Alouini, Mohamed‐Slim
• Is Part Of: Wireless communications and mobile computing. Volume 16:Issue 4(2016)
• Page Start: 469
• Page End: 485
• Publication Date: 2014-11-06
• Subjects: cooperative communication -- amplify‐and‐forward relay -- non‐coherent receiver -- partial coherent receiver -- detector design; Wireless communication systems -- Periodicals; Mobile communication systems -- Periodicals; 621.38205
• DOI: 10.1002/wcm.2550
• Languages: English
• ISSNs: 1530-8669

Abstract

Abstract: Consider a system in which the signal is transmitted from the source to the destination via a relay. The source–relay link and the relay–destination link are assumed to have Rician fading. For such a system, in this paper, we propose a novel non‐coherent receiver that detects the signal without knowledge of channel state information (CSI). In addition, we also propose novel receivers for the situation when only partial CSI is available at the destination; that is, channel knowledge of either the source–relay link or the relay–destination link, but not both, is available. These receivers are termed as "half‐coherent receivers" because they have the CSI of only one of the two links in the system. These half‐coherent receivers can be used in applications in which only the relay can afford additional complexity (e.g., the relay may be a base station) and includes a channel estimation module to acquire channel knowledge of the source–relay link or only the destination includes the channel estimation module to acquire channel knowledge of the relay–destination link. The symbol error rate performances of the proposed receivers for M ‐ary frequency‐shift keying are derived for Rician fading. Numerical results show that considerable performance gains can be achieved by using these new receivers, especially at a low signal‐to‐noise ratio where the gain is needed most. Copyright © 2014 John Wiley & Sons, Ltd. Abstract : A novel non‐coherent receiver, which detects the signal without knowledge of channel state information, and novel half‐coherent receivers, which detect the signal utilizing the channel state information of only one of the two links in the system, are proposed for amplify and forward relaying. The symbol error rate performances of the proposed receivers are analyzed. Numerical results show that considerable performance gains can be achieved by using these new receivers, especially at low signal‐to‐noise ratio where the gain is needed most.