Optimization of Single-Carrier UWB Transmissions for Narrowband Interference Avoidance

Spectral shaping for narrowband interference avoidance is an important part of cognitive radio, and is essential in ultra wideband (UWB) communication systems. In this paper, a novel interference avoidance algorithm is proposed for use in next-generation single-carrier UWB block transmission systems. The proposed technique provides a means of implementing interference avoidance in a dynamic manner with the added expense of an increase in transmitter complexity. When constant modulus constellations are employed, the receiver does not need any additional information about the transmitted signal in order to recover the transmitted message. Even with this "blind" detection strategy, the proposed method performs within 1-2 dB of a system where interference avoidance is not required or implemented.