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Codeword to layer mapping for multiple layers MIMO systems

Published: 28 June 2010 Publication History

Abstract

Currently multiple-input multiple-output (MIMO) technology has been widely studied in both industrial and academic areas as it can be utilized to transmit multiple spatially parallel streams. The number of data streams (or layer), supported over MIMO channel, is the maximum number of Tx/Rx antennas, where one encoded block is conveyed over one layer or aggregated several layers. In some cases, the transmission quality on different layers are not the same, which can be utilized to optimize the encoded stream to layer mapping in order to improve the link level performance. In this paper, relying on non-equal importance of information and parity bits in decoding, a new method to map the information bits onto high quality layer, whereas parity bits onto low quality layers is proposed. The performance gain obtained from the optimized mapping scheme is verified via simulation results.

References

[1]
3GPP RP-090359, Work Item Description for "Enhanced DL transmission for LTE", CMCC, TSG-RAN Meeting #43, Biarritz, France, 3rd-6th March 2009.
[2]
3GPP R1-094318 "Issues on Layer Shifting for Dual-Layer Beamforming", ITRI, T SG-RAN Meeting #58bis, Miyazaki, Japan, 12th--16th October 2009.
[3]
3GPP R1-094255, "Rank3 Precoding Design for LTE-A UL-MIMO", Fujitsu, T SG-RAN Meeting #58bis, Miyazaki, Japan, 12th--16th October 2009.
[4]
A. Paulraj, R. Nabr, and D. Gore, Introduction to Space-Time Wireless Communications, Cambridge University Press, NY, 2003.
[5]
3GPP TS 36.211. "3rd Generation Partnership Project: Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)".

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      cover image ACM Other conferences
      IWCMC '10: Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
      June 2010
      1371 pages
      ISBN:9781450300629
      DOI:10.1145/1815396
      Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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      Published: 28 June 2010

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      Author Tags

      1. 3GPP LTE
      2. MIMO
      3. layer mapping
      4. precoding

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