Pragmatic Physical Layer Abstraction Method Based on Bit-LLR-Wise Exponential Effective SNR Mapping for Bit Interleaved Coded Orthogonal Frequency Division Multiplexing System 被引量：1

Pragmatic Physical Layer Abstraction Method Based on Bit-LLR-Wise Exponential Effective SNR Mapping for Bit Interleaved Coded Orthogonal Frequency Division Multiplexing System

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摘要 In this paper, we analyze the physical layer abstraction for bit interleaved coded orthogonal frequency division multiplexing(BIC-OFDM) system from a parallel bit channel perspective. By combining the exponential effective SNR(signal-to-noise ratio) mapping(EESM) with the maximum a posteriori(MAP) algorithm, a bit LLR(log-likelihood ratio) wise EESM(BL-EESM) method is proposed. This method can abstract the link performance with high accuracy, especially for the case when channel estimation is imperfect. Afterward, the BL-EESM method is simplified by utilizing the non-linear quantization idea, which can reduce the times of exponential operation by two orders of magnitude at wide system bandwidth, yet shows little loss in accuracy. Our proposal can be applied to both system level simulations to save the time consumption and to practical terminals to facilitate the adaptive modulation and coding(AMC) procedure, bringing about throughput improvement at low hardware cost. In this paper, we analyze the physical layer abstraction for bit interleaved coded orthogonal frequency division multiplexing （BIC-OFDM） system from a parallel bit channel perspective. By combining the exponential effective SNR （signal-to-noise ratio） mapping （EESM） with the maximum a posteriori （MAP） algorithm, a bit LLR （log-likelihood ratio） wise EESM （BL-EESM） method is proposed. This method can abstract the link performance with high accuracy, especially for the case when channel estimation is imperfect. Afterward, the BL-EESM method is simplified by utilizing the non-linear quantization idea, which can reduce the times of exponential operation by two orders of magnitude at wide system bandwidth, yet shows little loss in accuracy. Our proposal can be applied to both system level simulations to save the time consumption and to practical terminals to facilitate the adaptive modulation and coding （AMC） procedure, bringing about throughput improvement at low hardware cost.

作者李孟实俞晖罗汉文徐友云

机构地区 Institute of Wireless Communication Technology

出处《Journal of Shanghai Jiaotong university(Science)》 EI 2014年第2期173-180,共8页 上海交通大学学报（英文版）

基金 the Shanghai Basic Research KeyProject(No.11DZ1500206) the NationalScience and Technology Major Project of China(No.2012ZX03001013-003)

关键词正交频分复用系统交织编码物理层抽象比特映射信噪比编码正交频分复用 physical layer abstraction, parallel bit channel, signal-to-noise ratio （SNR）, exponential effective SNR mapping （EESM）, adaptive modulation and coding （AMC）, quantization

分类号 TN92 [电子电信—通信与信息系统] TN911.22 [电子电信—通信与信息系统]

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