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Efficient Rate-Adaptive Modulation for LDPC-Coded OFDM System

机译：LDPC编码OFDM系统的高效速率自适应调制

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摘要

Adaptive coded modulation (ACM) is a key technique to increase spectral as well as power efficiency for orthogonal frequency division multiplexing (OFDM) systems. In this paper, an efficient rate adaptive low density parity check (LDPC) coded modulation (RALCM) algorithm is proposed, which maximizes the payload rate for OFDM systems under the constraint of the given transmit power and the target bit error rate (BER). Taking advantage of the two dimensional look up table for the signal to noise ratio (SNR) thresholds, the RALCM algorithm assigns different combinations of the LDPC code rates and quadrature amplitude modulation (QAM) modulations for subcarriers according to the channel frequency response (CFR). Both theoretical analysis and computer simulation show that the proposed algorithm not only efficiently improves the payload rate of the LDPC coded OFDM system over frequency selective fading channels, but also inherently reduces the computational complexity of the system optimization.
机译：自适应编码调制（ACM）是提高正交频分复用（OFDM）系统频谱和功率效率的关键技术。本文提出了一种高效的速率自适应低密度奇偶校验（LDPC）编码调制（RALCM）算法，该算法在给定发射功率和目标误码率（BER）的约束下，使OFDM系统的有效负载率最大化。利用二维查找表的信噪比（SNR）阈值，RALCM算法根据信道频率响应（CFR）为子载波分配LDPC码率和正交幅度调制（QAM）调制的不同组合。理论分析和计算机仿真均表明，该算法不仅有效地提高了频率选择性衰落信道下LDPC编码OFDM系统的有效负载率，而且从本质上降低了系统优化的计算复杂度。

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