DocumentCode :
2160110
Title :
Improved layered space time architecture over quasi-static fading channels with unequal power allocation and multistage decoding
Author :
Rezk, Dherar ; Wang, Xiaofeng
Author_Institution :
ECE Dept., Concordia Univ., Montreal, QC
fYear :
2009
fDate :
3-6 May 2009
Firstpage :
630
Lastpage :
634
Abstract :
The Bell labs layered space-time (BLAST) architecture pioneered by Foschini was found to achieve high spectral efficiency with moderate complexity. However, the redundancy in error correcting codes in BLAST receiver is not used in detection improvement, as detection and decoding are carried out separately. In this paper, we investigate a new approach for improved performance of BLAST based on multi-stage decoding (MSD) and unequal transmit power allocation among layers, for transmission over flat quasi-static Rayleigh fading channels. The use of MSD exploits the inherent redundancy in the employed channel codes to improve detection in BLAST without the need for complex iterative decoding approaches. In addition, we investigate unequal transmit power allocation among layers for transmission over flat quasi-static Rayleigh fading channels. We first derive a theorem for power allocation that maximizes outage capacity. We then find the unequal power allocation required to guarantee equal outage capacities among layers in BLAST combined with MSD detection. The proposed power allocation simplifies implementation and improves error performance. Simulation results show that the proposed architecture significantly outperforms existing BLAST schemes in terms of error performance for transmission over flat quasi-static Rayleigh fading channels.
Keywords :
MIMO communication; Rayleigh channels; channel coding; decoding; error correction codes; radio receivers; signal detection; space-time codes; spectral analysis; BLAST receiver; Bell labs layered space-time architecture; MIMO; channel code; error correcting code; high spectral efficiency; iterative decoding; multistage decoding; quasistatic Rayleigh fading channel; signal detection; unequal transmit power allocation; Degradation; Error correction codes; Fading; Interference cancellation; Interleaved codes; Iterative decoding; MIMO; Modulation coding; Receiving antennas; Redundancy; BLAST; MIMO; MSD; power allocation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical and Computer Engineering, 2009. CCECE '09. Canadian Conference on
Conference_Location :
St. John´s, NL
ISSN :
0840-7789
Print_ISBN :
978-1-4244-3509-8
Electronic_ISBN :
0840-7789
Type :
conf
DOI :
10.1109/CCECE.2009.5090205
Filename :
5090205
Link To Document :
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