| 摘要: |
| 针对OFDM系统中的MQAM和MDAPSK两种子载波高阶调制技术，介绍了64QAM和64DAPSK信号的比特软输出解调方法，比较了64DAPSK-OFDM和64QAM-OFDM系统的误码性能。仿真结果表明，在频率选择性和时间选择性衰落信道下，若信道相邻子载波或相邻OFDM符号的相关性能得到保证，采用64DAPSK调制可以用较少的信噪比损失换取OFDM系统复杂度的大大降低。 |
| 关键词: OFDM系统 QAM 子载波 高阶调制 频率选择性 软输出 误码性能 仿真结果 复杂度 性能比较 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目:国家863计划资助项目(2001AA121031) |
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| Performance Comparison between 64DAPSK-OFDM and 64QAM-OFDM Systems |
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| Abstract: |
| After describing the bit soft-output demodulation methods for 64QAM and 64DAPSK signals, the Bit Error Rate(BER) performance is compared using 64DAPSK and 64QAM modulation schemes for each COFDM sub-carrier in multilevel modulation OFDM systems. The simulation results show that the complexity of 64DAPSK system is considerably lower at the cost of a somewhat reduced Signal-to-Noise Ratio(SNR) performance in frequency-selective and time-selective fading channel in contrast with 64QAM system. |
| Key words: COFDM,64QAM,64DAPSK,BER, |
