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METHOD OF NON-UNIFORM DOPPLER COMPENSATION FOR WIDEBAND ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED SIGNALS
METHOD OF NON-UNIFORM DOPPLER COMPENSATION FOR WIDEBAND ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED SIGNALS
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机译:宽带正交频分复用信号的非均匀多普勒补偿方法
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摘要
Described is a method for compensation of an OFDM signal propagating through Doppler-distorted, time-varying multipath channels. The method is based on low-complexity post-FFT signal processing. Minimum mean square error combining of signals is performed for signals received at spatially-distributed receiver elements using adaptive channel estimation and phase tracking. Doppler shifts are modeled as a consequence of motion-induced time compression and dilation. The Doppler rate is assumed constant over one OFDM block but can vary between OFDM blocks. Thus a non-constant Doppler shift is accommodated by the method. Non-uniform Doppler compensation across subchannels is based on adaptive estimation and prediction of the Doppler rate. A single adaptively estimated parameter is used to track the phases of all the carriers and channel estimates are updated on a block by block basis.
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