Low-Complexity Concatenated Soft-In Soft-Out Detector for Spreading OFDM Systems

• WANG Huan-Chun

  Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology

• HUANG De-Jhen

  Department of Electronic and Computer Engineering, National Taiwan University of Science and Technology

抄録

This paper proposes a low-complexity concatenated (LCC) soft-in soft-out (SISO) detector for spreading OFDM systems. The LCC SISO detector uses the turbo principle to compute the extrinsic information of the optimal maximum a priori probability (MAP) SISO detector with extremely low complexity. To develop the LCC SISO detector, we first partition the spreading matrix into some concatenated sparse matrices separated by interleavers. Then, we use the turbo principle to concatenate some SISO detectors, which are separated by de-interleavers or interleavers. Each SISO detector computes the soft information for each sparse matrix. By exchanging the soft information between the SISO detectors, we find the extrinsic information of the MAP SISO detector with extremely low complexity. Simulation results show that using the LCC SISO detector produces a near-optimal performance for both uncoded and coded spreading OFDM systems. In addition, by using the LCC SISO detector, the spreading OFDM system significantly improves the BER of the conventional OFDM system.

収録刊行物

• IEICE Transactions on Communications

  IEICE Transactions on Communications E95.B (11), 3480-3491, 2012

  一般社団法人 電子情報通信学会

キーワード

• maximum a priori probability SISO detector
• spreading OFDM
• extrinsic information
• turbo principle
• concatenated sparse matrices
• concatenated SISO detectors

詳細情報

• CRID: 1390282679351253888
• NII論文ID: 10031142743
• NII書誌ID: AA10826261
• DOI: 10.1587/transcom.e95.b.3480
• ISSN: 17451345
• ISSN: 09168516
• Web Site: https://www.jstage.jst.go.jp/article/transcom/E95.B/11/E95.B_3480/_pdf
• 本文言語コード: en
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