Spreading sequence selection scheme for NBI suppression IN DS-UWB systems

Interference suppression is important for the ultra-wideband (UWB) systems to operate over spectrum occupied by pre-existing narrowband systems. In this paper, a spreading sequence selection scheme is proposed for code-aided interference suppression in direct-sequence UWB (DS-UWB) systems. Compared with a randomly selected spreading sequence, the presented scheme can ensure the system achieves suboptimal performance. Compared with our recently proposed eigenvector sign (EVS) spreading sequence, an equalizer can be avoided for high speed application by using the selected spreading sequence, which reduces the complexity of system implementation.