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A New Five-Bit 128-Tone Sigma-Delta Modulation D/A and A/D Converters for UWB-OFDM Transceiver
Jeich MAR You-Rong LIN
Publication
IEICE TRANSACTIONS on Communications
Vol.E91-B
No.1
pp.183-196 Publication Date: 2008/01/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.1.183 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Devices/Circuits for Communications Keyword: N-tone sigma-delta modulation (SDM), UWB-OFDM, peak-to-average power ratio, D/A, A/D, time domain-based interpolator and decimator,
Full Text: PDF>>
Summary:
For the purpose of reducing the quantization noise and power consumption of UWB-OFDM transceiver, a new time domain-based interpolator and decimator structure is proposed to realize five-bit D/A and A/D converters in the five-bit 128-tone sigma-delta modulation (SDM) UWB-OFDM transceiver. The five-bit 128-tone SDM UWB-OFDM transceiver using time domain-based interpolator and decimator in place of time spreader and de-spreader can obtain time-domain spread spectrum processing gain and reduce quantization noise simultaneously. The structure of the five-bit 128-tone SDM A/D converter, which employs 32 parallel analog SDM circuits without up-sampling, is designed. Simulation results demonstrate that BER of the proposed five-bit 128-tone SDM D/A and A/D converters based on time domain-based interpolator and decimator scheme can satisfy the performance requirements of the five-bit 128-tone SDM UWB-OFDM transceiver for the QPSK, 16-QAM and 64-QAM modulations.
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