Performance of N-tone sigma-delta modulators for UWB-OFDM

Kai Chuan Chang, Gerald E Sobelman, Ebrahim Saberinia, Ahmed H. Tewfik

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Due to the spectrum gap between subcarriers in a UWB-OFDM system, an N-tone sigma-delta modulator can be used to introduce appropriately placed nulls into the noise spectrum of such systems. The resulting performance is evaluated in terms of in-band quantization noise and excess resolution gained. Moreover, we relate the performance of our system to that of a traditional oversampled sigma-delta modulator operating in a lowpass system. A higher-order N-tone sigma-delta modulator having better noise shaping ability is also introduced for use in UWB-OFDM systems.

Original languageEnglish (US)
Pages (from-to)2483-2486
Number of pages4
JournalIEEE International Conference on Communications
StatePublished - Aug 30 2004
Event2004 IEEE International Conference on Communications - Paris, France
Duration: Jun 20 2004Jun 24 2004


  • Noise shaping
  • Sigma-delta


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