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 language||English (US)|
|Number of pages||4|
|Journal||IEEE International Conference on Communications|
|State||Published - Aug 30 2004|
|Event||2004 IEEE International Conference on Communications - Paris, France|
Duration: Jun 20 2004 → Jun 24 2004
- Noise shaping