DocumentCode :
1610991
Title :
A new scalable decoder for linear space-time block codes with intersymbol interference
Author :
Kuhn, Marc ; Wittneben, Armin
Author_Institution :
Inst. of Digital Commun., Saarlandes Univ., Saarbrucken, Germany
Volume :
4
fYear :
2002
fDate :
6/24/1905 12:00:00 AM
Firstpage :
1795
Abstract :
Space-time codes represent a key technology for future broadband wireless communication systems. A class of space-time block codes according to Wittneben and Kuhn (see VTC 2002 - Spring) is used which can lead to intersymbol interference (ISI) due to an optimized diversity performance. Therefore ISI compensation is an important task of the decoding process of these codes. Several known ISI compensation methods can be applied for example MMSE equalization or parallel or serial ISI cancellation. In this paper a new scalable ISI cancellation method is presented, that by using a posteriori information achieves almost the performance of the maximum likelihood decoder but with a much lower complexity. The key idea is to use estimated a posteriori probabilities to determine the order of the cancellation process. In each iteration the decoder jointly decodes a variable number of symbols, which meet a specified probability threshold. By varying the threshold, the decoder is scalable in such a way that the complexity of the decoder - and consequently the available data flow rate - can be adapted in a wide range to the requests of the transmission, to a given node complexity or a required quality of service.
Keywords :
AWGN channels; Rayleigh channels; block codes; decoding; diversity reception; equalisers; interference suppression; intersymbol interference; least mean squares methods; AWGN channel; ISI cancellation; ISI compensation methods; MMSE equalization; QoS; Rayleigh fading; broadband wireless communication systems; data flow rate; decoding; estimated a posteriori probability; intersymbol interference; linear space-time block codes; maximum likelihood decoder; node complexity; optimized diversity performance; parallel ISI cancellation; probability threshold; quality of service; scalable ISI cancellation method; scalable decoder; serial ISI cancellation; symbol error rate; Block codes; Broadband communication; Intersymbol interference; Iterative decoding; Maximum likelihood decoding; Maximum likelihood estimation; Space technology; Space time codes; Springs; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2002. VTC Spring 2002. IEEE 55th
Print_ISBN :
0-7803-7484-3
Type :
conf
DOI :
10.1109/VTC.2002.1002930
Filename :
1002930
Link To Document :
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