Referring to the parity check matrix structure of Quasi Cycle LDPC code in IEEE 802. 16e, a new parity check matrix was designed and was applied to OFDM system. Comparing the design scheme with concatenated code scheme which was constructed by RS and convolution code, the simulation results show that the design and the concatenated code have almost the same coding gain. Using BPSK before OFDM modulation can have 2 dB more gain than the condition of using QPSK. For the purpose of comparison, under BPSK modulation, a simulated comparison between the design scheme and concatenated code is performed, and results show that the design has almost 3 dB gain than concatenated code.%参照IEEE 802.16e标准中的准循环LDPC码校验矩阵结构,设计了一种新的校验矩阵,并将其应用于OFDM系统中.同时,将该设计方案与RS和卷积编码级联方案进行比较,仿真显示,该方案与级联编码方案有几乎相同的编码增益.OFDM调制之前采用BPSK映射比采用QPSK映射有2 dB的增益.出于对比的目的,在BPSK调制模式下,对该设计方案与级联编码方案也做了仿真比较,结果显示,前者比后者有大约3 dB的编码增益.
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