TMRC-Filter: a subband filter design method for Filtered OFDM system

doi:10.7523/j.issn.2095-6134.2020.01.014

Abstract

Abstract: In order to satisfy requirements for the subband filter in Filtered-OFDM (filtered-orthogonal frequency division multiplexing) systems, the TMRC-Filter (truncate modified raised-cosine filter) is proposed based on the window function method. Compared with the traditional SinC-Filter (windowed sinc function filter) and RC-Filter (raised-cosine filter) whose linear phase filter ends with 0, the linear phase filter of the proposed TMRC-Filter ends with a non-zero roll-cut-off-amplitude factor, and the rolled-off bandwidth of the proposed TMRC-Filter can be flexibly adjusted. Moreover, the performance of the rpoposed TMRC-Filter is totally determined by the rolled-off bandwidth which is independent of the system parameter and roll-off factor, and it is simple to implement. The simulation results show that the TMRC-Filter achieves the lower ripple, larger stop-band attenuation, and better time localization than the SinC-Filter and the narrower transition band than the RC-Filter.

Key words: digital communication technology, TMRC-Filter, linear phase filter, Filtered OFDM

CLC Number:

TN929.5

LI Yingrui, XU Jing, LIU Xiang, YI Huiyue. TMRC-Filter: a subband filter design method for Filtered OFDM system[J]. , 2020, 37(1): 120-127.

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