The time domain-based interpolation and decimation processing for N-tone sigma-delta circuit in UWB-OFDM transceiver
Jeich Mar, You-Rong Lin · 2007
A new null quantization noise canceling structure designed with the time domain-based interpolation and decimation for the N-tone sigma-delta modulation (SDM) UWBOFDM transceiver is proposed. The required length of IFFT and FFT processing will not change with the interpolation factor. The bit error rate (BER) for QPSK, 16-QAM and 64-QAM UWBOFDM transceiver using the 128-tone SDM circuit with the optimum quantization size and additive white Gaussian noise (AWGN) channel are simulated. The null quantization noise floor generated from the 128-tone SDM circuit can be avoided when the proper interpolation factor is chosen. The proposed null quantization noise cancellation structure can greatly reduce the hardware gate count and processing time of the N-tone SDM UWB-OFDM transceiver.