A Reduced Overhead OFDM Relay System with Clusterwise TMRC Beamforming

Author

Xie, Baile ; Munoz, Daniel ; Minn, Hlaing

Author_Institution

Dept. of Electr. Eng., Univ. of Texas at Dallas, Dallas, TX, USA

Volume

16

Issue

12

fYear

2012

fDate

12/1/2012 12:00:00 AM

Firstpage

1913

Lastpage

1916

Abstract

We consider a relay clustering system using decode and forward (DF) relaying, orthogonal frequency division multiplexing (OFDM), and transmit maximal ratio combining beamforming (TMRC-BF) at the relays. We address channel estimation at the destination for the above system. A cluster pairing scheme with corresponding pilot designs is proposed. It reduces both necessary pilot overhead and computational complexity by half. Simulation results show that if the signal to noise ratio (SNR) of pilots for channel estimation for TMRC-BF at the relays is kept above a threshold (5 dB below the SNR of the pilots sent to the destination by the cluster pairing strategy), nearly optimal channel estimation performance can be achieved.

Keywords

OFDM modulation; array signal processing; channel estimation; computational complexity; decode and forward communication; diversity reception; channel estimation; cluster pairing scheme; cluster pairing strategy; clusterwise TMRC beamforming; computational complexity; decode and forward relaying; orthogonal frequency division multiplexing; pilot designs; pilot overhead; reduced overhead OFDM relay system; signal to noise ratio; transmit maximal ratio combining beamforming; Antennas; Array signal processing; Channel estimation; Frequency division multiplexing; OFDM; Relays; Signal to noise ratio; Relay; TMRC-BF; channel estimation; pilot designs; relay cluster pairing;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.101712.121450

Filename

6336852