Doppler compensation for high-mobility communication systems using uniform linear array

作者：Zhang Ying; Yin Qinye^*; Mu Pengcheng

来源：Journal of Xi'an Jiaotong University, 2011, 45(8): 73-77+122.

• Doppler
• Doppler diversity
• Doppler frequency
• Doppler shifts
• Doppler spreading
• Error floor
• High mobility
• Intercarrier interference
• Maximal-ratio
• Orthogonal frequency division
• Orthogonal frequency division multiplexing systems
• Signal to interferences
• Simulation result
• Subchannels
• Uniform linear arrays

A scheme which employs uniform linear array and can compensate multiple Doppler shifts simultaneously is proposed to eliminate intercarrier interference caused by Doppler spreading in high-mobility orthogonal frequency division multiplexing systems. The scheme separates different paths with unique Doppler frequency in space-domain, and generates multiple sub-channels. The Doppler shift on each sub-channel is then corrected independently and finally, the compensated multiple sub-channels are combined together for maximal-ratio so that Doppler diversity gains are realized. The time-variance of each sub-channel is reduced after compensation, and the estimation and equalization processes on receivers are simplified. Simulation results show that when sufficient elements are used, the error floors in high-mobility scenario are effectively combated, and a 6-8 dB signal-to-interference gain over one-antenna reception is obtained by the proposed scheme.

• 出版日期2011