全相位FFT的OFDM系统ΣΔ量化噪声整形

doi:10.3969/j.issn.1001-2400.2017.04.015

Abstract

Abstract:

To solve the problem of quantization noise in OFDM systems, a study of sigma-delta quantization noise shaping based on the all phase FFT is presented. This paper first gives single zero and multiple zeros sigma-delta modulators used for the theoretical analysis of quantization noise shaping for the OFDM system, and points out that the non-cyclic quantization noise structure results in inter-carrier interference (ICI) and inter-symbol interference (ISI) of quantization noise at the frequency points of OFDM sub-carriers; then it gives the scheme and performance analysis based on the all phase FFT to further reduce the quantization noise at the frequency points. Simulations show that the multi-zero sigma delta modulator performs better in noise shaping compared to the conventional single-zero modulator in OFDM systems, and can further reduce the quantization noise, and that under the conditions of 2bit quantization and 5dB SNR, the bit error rate of the system deceases by 1 order of magnitude.

Key words: orthogonal frequency division multiplexing, quantization noise, shaping, all phase fast Fourier transform

GE Lijun;ZHAO Lan;LI Yue;GUO Hui;LI Mingyang;ZHAO Ruijun. Quantization noise shaping of the sigma-delta modulator based on the all phase FFT in OFDM systems[J].Journal of Xidian University, 2017, 44(4): 80-85+117.

References

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Quantization noise shaping of the sigma-delta modulator based on the all phase FFT in OFDM systems

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