DocumentCode :
2060006
Title :
On the Decoding Complexity of D-TR-STBC for Single Carrier Relay-Assisted Transmissions
Author :
Ganesan, Sudharsan ; Sellathurai, Mathini
Author_Institution :
ECIT, Queen´´s Univ. Belfast, Belfast
fYear :
2009
fDate :
26-29 April 2009
Firstpage :
1
Lastpage :
5
Abstract :
In this paper, we present a low complexity maximum likelihood (ML) detection based on the sphere decoder (SD) for distributed time-reversal space-time block code (D-TR-STBC) with frequency selective fading links. Unlike direct transmission, the relay-assisted transmission results in higher number of taps for the resultant end-end channel. The complexity of Viterbi algorithm (VA) grows exponentially with the channel memory and the signal modulation order. Hence makes it prohibitive for the above scenario. On the other hand, the complexity of SD is a low-degree polynomial in the block length and does not vary significantly with the channel memory and the modulation order over the signal to noise ratio (SNR) range of interest. This offers a significant computational reduction over VA specifically for relay networks that provide higher diversity. To corroborate our claims, we have shown the simulation results comparing the average complexities of SD and VA for various system settings. A further reduction in the average complexity of SD is achieved for D-TR-STBC with multiple relays and with relay selection.
Keywords :
Viterbi decoding; block codes; channel coding; fading channels; maximum likelihood detection; space-time codes; Viterbi algorithm; decoding complexity; distributed time-reversal space-time block codes; frequency selective fading; maximum likelihood detection; relay selection; signal to noise ratio; single carrier relay-assisted transmissions; sphere decoder; Block codes; Computer networks; Fading; Frequency; Maximum likelihood decoding; Maximum likelihood detection; Polynomials; Relays; Signal to noise ratio; Viterbi algorithm;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Conference_Location :
Barcelona
ISSN :
1550-2252
Print_ISBN :
978-1-4244-2517-4
Electronic_ISBN :
1550-2252
Type :
conf
DOI :
10.1109/VETECS.2009.5073726
Filename :
5073726
Link To Document :
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