| 64DAPSK-OFDM与64QAM-OFDM系统性能比较 |
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| 引用本文： | 秦雅娟,刘元安.64DAPSK-OFDM与64QAM-OFDM系统性能比较[J].电讯技术,2004,44(5):30-34. |
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| 作者姓名： | 秦雅娟 刘元安 |
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| 作者单位： | 北京邮电大学,电信工程学院,北京,100876;北京邮电大学,电信工程学院,北京,100876 |
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| 基金项目： | 国家863计划资助项目(2001AA121031) |
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| 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。
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| 关 键 词： | 编码OFDM 64QAM 64DAPSK 比特差错率 |
| 文章编号： | 1001-893X(2004)05-0030-05 |
Performance Comparison between 64DAPSK-OFDM and 64QAM-OFDM Systems |
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| QIN Ya-juan,LIU Yuan-an.Performance Comparison between 64DAPSK-OFDM and 64QAM-OFDM Systems[J].Telecommunication Engineering,2004,44(5):30-34. |
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| Authors: | QIN Ya-juan LIU Yuan-an |
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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. |
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| Keywords: | COFDM 64QAM 64DAPSK BER |
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