UWB Signal Detection Based on Sequence Optimization

We propose a novel approach to UWB signal detection, where a spreading sequence is transmitted, and signal detection, based on sequence optimization for the multipath detection at the correlator-receiver is based on a fixed spread-transmission channel. The transmit waveform is made up of a train of delayed and scaled pulses, the amplitudes of which can he represented by a real-valued sequence. The correlator template at the receiver is formed of another real-valued sequence. Both sequences are jointly optimized such that the correlation of the received signal with the correlation template is maximized. These results in coherent combining of a substantial number of the multipath components at the receiver, leading to very high energy capture with the use of a simple receiver. Simulation results based on measured channel profiles show that the proposed scheme offers substantial improvements over a Rake receiver using a large number of fingers and maximum ratio combining. Also, the proposed scheme gives improved performance over a pilot-assisted template receiver with a heavy training overload