An UWB cognitive radio system based on bridge function sequence matrix and PSWF pulse waveform

An Ultra Wideband (UWB) cognitive radio system using soft-spectrum adaptation (SSA) scheme is discussed. In this paper, SSA scheme is based on Bridge function sequence square matrix and PSWF-based orthogonal pulse waveform. Every information bit is transmitted over parallel Bridge function sequence square matrix, each row of which is carried by a different PSWF-based orthogonal chip pulse waveform. Each row sequence of Bridge function sequence square matrix has zero correction zones in its aperiodic autocorrelation function, which can reduce Inter-pulse-interference in the multipath fading environment. The simulation in SIMULINK/MATLAB is described in detail, and the result shows the system has better performance by comparison with that employing Walsh sequence square matrix.