时变信道可以提供时间分集，也称为多普勒分集。
Time-varying channel can provide time diversity, also known as the Doppler diversity.
提出了一种新的频域多普勒分集技术的OFDM系统。
A novel frequency domain Doppler diversity technique for OFDM systems is proposed.
多普勒分集将多普勒扩展作为一种分集方式，通过增强信号能量来改善系统性能。
Doppler diversity considers Doppler spread as a way of diversity, and improves the system performance by enhancing the signal energy.
将多普勒分集技术应用于OFDM系统，可以有效地对抗多普勒扩展对系统性能的影响。
Applying Doppler diversity in OFDM system can combat the effect of Doppler spread on system performance.
大量的仿真结果表明，三个分集结合适当的频率变化，降低了误码率的命令时，归一化多普勒扩展是大于0.3。
Extensive simulations show that combining three diversity branches with proper frequency shifts reduces BER by an order when the normalized Doppler spread is larger than 0.3.
大量的仿真结果表明，三个分集结合适当的频率变化，降低了误码率的命令时，归一化多普勒扩展是大于0.3。
Extensive simulations show that combining three diversity branches with proper frequency shifts reduces BER by an order when the normalized Doppler spread is larger than 0.3.
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