一种单载波频域均衡输出符号的软信息计算方法

张磊; 蒋伟; 项海格

doi:10.3724/SP.J.1146.2006.02070

一种单载波频域均衡输出符号的软信息计算方法

doi: 10.3724/SP.J.1146.2006.02070

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出版历程
- 收稿日期: 2006-12-28
- 修回日期: 2007-07-17
- 刊出日期: 2008-08-19

A Soft Output Information Calculation Method for SC-FDE

摘要

摘要: 在单载波传输中，对多径接收信号进行单载波频域均衡(SC-FDE)可令系统以较低的复杂度获得较强的抗多径能力，但传统SC-FDE不能直接为后续的软输入软输出(SISO)迭代译码模块提供译码所需的软信息。而SISO迭代译码器恰是Turbo码、LDPC码等Shannon极限码发挥良好纠错能力的重要手段。为了使SC-FDE与SISO迭代译码相结合，该文在导频数据时分复接块传输(TD-PABT)系统中给出了一种SC-FDE输出符号软信息的计算方法，并进行了仿真验证。仿真结果表明，采用该文所述的输出符号软信息计算方法的软输出SC-FDE能够与LDPC码很好地结合，且该系统误码性能明显好于采用传统SC-FDE和卷积码的TD-PABT系统。
- 单载波频域均衡; 导频辅助的块传输; 软输出; Shannon极限码
Abstract: Frequency Domain Equalization for Single Carrier transmission (SC-FDE) attracted much attention due to its low complexity and performance in suppressing ISI. But SC-FDE usually can not provide soft information for Soft-In Soft-Out (SISO) decoders which Shannon limit codes relies on to achieve outstanding BER performance. In order to combine SISO decoders with SC-FDE, a method to calculate the soft information of SC-FDE output symbols is proposed in this paper, and its validity is confirmed by simulations.

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Tong L, Sadler B M, and Dong M. Pilot-assisted wirelesstransmissions: general model, design criteria, and signalsprocessing[J].IEEE Signal Processing Magazine.2004, 21(11):12-25[2]焦现军. 导频辅助的块传输技术. [博士论文], 北京大学, 2006.Jiao Xianjun. Pilot assisted block transmission. [Dissertation],PKU, 2006.[3]ETSI. Digital Video Broadcasting (DVB); Framing structure,channel coding and modulation for digital terrestrialtelevision. European Telecommunication Standard EN300744,2004.[4]Wang Z and Giannakis G B. Wireless multicarriercommunications: where fourier meets Shannon[J].IEEE SignalProcessing Magazine.2000, 17(3):29-48[5]Muquet B, Wang Z D, and Giannakis G B, et al.. Cyclicprefixing or zero padding for wireless multicarriertransmissions[J].IEEE Trans. on Communications.2002,50(12):2136-2148[6]Falconer D, Ariyavisitakul S, and Benyamin-Seeyar A, et al..Frequency domain equalization for single-carrier broadbandwireless systems. IEEE Communications Magazine, 2002,40(4): 58-66.[7]Berrou C, Glavieux A, and Thitimajshima P. Near shannonlimit error-correcting coding and decoding: Turbo-codes.IEEE International Conference on Communications, Geneva,1993, 1: 1064-1070.[8]Gallager R G. Low-Density Parity-Check Codes. [Thesis],MIT, 1963.[9]Kschischang F R, Frey B J, and Loeliger H A. Factor graphsand the sum-product algorithm[J].IEEE Trans. on InformaitonTheory.2001, 47(2):498-519[10]Muquet B, Courville M, and Duhamel P, et al.. Turbodemodulation of zero-padded OFDM transmissions. IEEETrans. on Communications, 2002, 50(11): 1725-1728.[11]Erceg V, Hari K V S, and Smith M S. Channel models forfixed wireless applications. IEEE 802.16.3c-01/29rl Feb. 23,2001.[12]Song Bowei, Gui Lin, and Guan Yunfeng, et al.. On channelestimation and equalization in TDS-OFDM based terrestrialHDTV broadcasting system. IEEE Trans. on ConsumerElectronics, 2005, 51(3): 790-797.

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