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为了在正交频分复用(OFDM)系统中充分利用非正则低密度奇偶校验(LDPC)码编码比特错误概率不同的特性,提出了一种新的基于自适应排序LDPC码的OFDM传输技术.假设发射机已知信道状态信息(CSI),非正则LDPC码的编码比特根据度进行排序,并被分配到相应的子载波上,度高的比特分配到轻度衰落的子载波,度低的节点分配到深度衰落的子载波.为了降低反馈信道的开销,可以对反馈的CSI进行量化.该传输技术的性能可以由密度演进算法进行分析.分析和仿真结果表明,相对于传统的无排序LDPC码编码OFDM系统,所提出的基于自适应排序LDPC码的OFDM系统可以获得1 ~1.5dB的性能增益,并且对CSI的量化具有鲁棒性.
In order to make full use of the different characteristics of the bit error probability of non-LDPC codes in Orthogonal Frequency Division Multiplexing (OFDM) systems, a new OFDM transmission technique based on adaptive LDPC codes Assuming that the transmitter knows the channel state information (CSI), the encoded bits of the non-regular LDPC code are sorted according to degree and allocated to the corresponding subcarriers, the bits of higher degree are allocated to the subcarriers of light fading, the degree of low In order to reduce the overhead of the feedback channel, the feedback CSI can be quantified.The performance of the transmission technology can be analyzed by the density evolution algorithm.The analysis and simulation results show that compared with the traditional non-ordering LDPC coding OFDM system, the proposed OFDM system based on adaptive sorting LDPC code can gain 1 ~ 1.5dB performance gain, and the quantization of CSI is robust.