Soft-decision-and-forward protocol for cooperative communication networks with multiple antennas

Author

Yang, Jae-Dong ; Song, Kyoung-Young ; No, Jong-Seon ; Shin, Dong-Joon

Author_Institution

Samsung Electron. Co., Ltd., Suwon, South Korea

Volume

13

Issue

3

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

257

Lastpage

265

Abstract

In this paper, a cooperative relaying protocol called soft-decision-and-forward (SDF) with multiple antennas in each node is introduced. SDF protocol exploits the soft decision source symbol values from the received signal at the relay node. For orthogonal transmission (OT), orthogonal codes including Alamouti code are used and for non-orthogonal transmission (NT), distributed space-time codes are designed by using a quasi-orthogonal space-time block code. The optimal maximum likelihood (ML) decoders for the proposed protocol with low de coding complexity are proposed. For OT, the ML decoders are derived as symbolwise decoders while for NT, the ML decoders are derived as pairwise decoders. It can be seen through simulations that SDF protocol outperforms AF protocol for both OT and NT.

Keywords

antenna arrays; cooperative communication; maximum likelihood decoding; orthogonal codes; protocols; space-time block codes; Alamouti code; cooperative communication network; cooperative relaying protocol; distributed space-time codes; multiple antennas; nonorthogonal transmission; optimal maximum likelihood decoder; orthogonal code; quasi-orthogonal space-time block code; relay node; soft decision and forward protocol; Covariance matrix; Decoding; Noise; Protocols; Receiving antennas; Relays; Transmitting antennas; Amplify-and-forward (AF); cooperative communications; distributed space-time code (DSTC); maximum-likelihood (ML) decoder; soft-decision-and-forward (SDF);

fLanguage

English

Journal_Title

Communications and Networks, Journal of

Publisher

ieee

ISSN

1229-2370

Type

jour

DOI

10.1109/JCN.2011.6157435

Filename

6157435