Proceedings Article10.1109/GLOCOM.2003.1258371
Incremental redundancy and bit-mapping techniques for high speed downlink packet access
M. Dottling,T. Grundler,A. Seeger +2 more
- 01 Dec 2003
- Vol. 2, pp 908-912
28
TL;DR: The implementation and performance of HARQ and bit-to-symbol mapping functions are focused on and it is shown that depending on the code rate and the user terminal capabilities different HARQ types are favorable.
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Abstract: A major evolution of the UMTS standard is high speed downlink packet access (HSDPA), which provides higher cell throughput and peak data rates of 10.8 Mbps. Key enabling technologies include fast scheduling, adaptive modulation and coding (AMC), as well as hybrid automatic repeat request (HARQ). To ease the implementation of HSDPA all coding elements are identical to standard WCDMA. In particular, the rate 1/3 turbo code is reused and no trellis coded modulation scheme has been introduced. The resulting drawbacks are analyzed and it is shown how they are efficiently counteracted by bit-mapping techniques accounting for the different bit reliabilities within a 16-QAM symbol. This paper focuses on the implementation and performance of HARQ and bit-to-symbol mapping functions. The performance of different HARQ schemes is compared for QPSK and 16-QAM and varying code rates. It is shown that depending on the code rate and the user terminal capabilities different HARQ types are favorable.
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Automatic-repeat-request error-control schemes
TL;DR: In this article, a survey of various types of ARQ and hybrid ARQ schemes, and error detection using linear block codes is presented, where a properly chosen code is used for error detection, virtually error-free data transmission can be attained.
Hybrid ARQ and adaptive modulation and coding schemes for high speed downlink packet access
M. Dottling,Juergen Michel,Bernhard Raaf +2 more
- 10 Dec 2002
TL;DR: It is shown that the throughput gains offered by advanced HARQ schemes depend on the performance of the AMC function, and the gain offered by incremental redundancy techniques increases with increasing errors in selecting the appropriate modulation and code rate.
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Performance of hybrid ARQ techniques for WCDMA high data rates
E. Malkamaki,D. Mathew,Seppo Hämäläinen +2 more
- 06 May 2001
TL;DR: The hybrid ARQ schemes are shown to achieve higher throughput and capacity than the conventional ARZ schemes currently specified in the 3GPP WCDMA standard.
Automatic-repeat-request error control schemes
Shu Lin,D. J. Costello,M. J. Miller +2 more
- 01 Jan 1983
TL;DR: Various types of ARQ and hybrid ARQ schemes, and error detection using linear block codes are surveyed, and errors in these schemes are found to be low.