Title :
Hybrid ARQ protocols using space-time codes
Author :
Nguyen, Anh ; Ingram, Mary
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
Automatic repeat-request (ARQ) protocols using transmit diversity are investigated. The performance of space-time codes (STC) in a pure ARQ protocol (ST-ARQ) is first examined. Two hybrid ARQ schemes using STC are then proposed: space-time hybrid ARQ (ST-HARQ) and turbo space-time hybrid ARQ (TST-HARQ). For the ST-HARQ scheme, the previous transmitted packets are combined with the current received packet. In this scheme, the diversity gain is increased with every retransmission resulting in a higher probability of an accepted packet. For TST-HARQ, the transmitted packets are code combined and iteratively decoded. Performance analysis of ST-ARQ and ST-HARQ are approximated and shown to agree well with simulated results. TST-HARQ is shown to have the highest throughput efficiency compared to ST-HARQ and ST-ARQ in quasi-static and fast flat Rayleigh fading channels
Keywords :
Rayleigh channels; access protocols; automatic repeat request; diversity reception; iterative decoding; packet radio networks; turbo codes; ST-ARQ; ST-HARQ; TST-HARQ; automatic repeat-request protocols; code combining; fast flat Rayleigh fading channels; hybrid ARQ protocols; multipath fading; packet transmission; quasi-static channels; simulated results; space-time codes; space-time hybrid ARQ; throughput efficiency; transmit diversity; turbo space-time hybrid ARQ; Analytical models; Automatic repeat request; Decoding; Diversity reception; Fading; Performance analysis; Protocols; Space time codes; Throughput; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.957172
