LTE系统中可配置FFT／IFFT的设计与实现

doi:10.3969/j.issn.1001-2400.2010.05.007

Abstract

Abstract:

A design of the variable-point FFT／IFFT for non-2ⁿ is proposed in consideration of the characteristics of the variable-length and non-2ⁿ subcarriers in the 3GPP LTE system. A high speed and configurable FFT／IFFT is designed by using the mixed radix with radix-2, radix-3, and radix-4 based on the pipelined ping-pong architecture. It will save about 100kbits storage space since all the twiddle factors are stored in the same space and RAM is shared by I／O data after optimizing the address generation unit. Simulation results show that the design can satisfy the need of the FFT／IFFT for different bandwidths in a high-speed LTE system.

Key words: orthogonal frequency division multiplexing(OFDM), LTE, FFT／IFFT

LIU De-fu;LEI Tian-min;MA Zhuo;LI Ying;WANG Yang. Design and implementation of configurable FFT／IFFT in the LTE system[J].J4, 2010, 37(5): 813-816+824.

References

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Design and implementation of configurable FFT／IFFT in the LTE system

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