Fractionally Spaced Selective Rake Reception for MBOK DS-UWB Systems

This paper proposes fractionally spaced selective Rake (FSRake) receiver for M-ary bi-orthogonal keying based direct sequence ultra wideband (MBOK DS-UWB) wireless systems. Conventional Rake receiver combines resolved matched filter outputs by sampling with pulse duration. In the proposed FSRake reception, matched filter output is sampled by the fractional duration of pulse. A certain number of strongest paths are combined among these sampled outputs. This proposed FSRake receiver provides more energy capture than conventional Rake receiver. Simulation results show that the proposed FSRake reception provides more than 8 dB SNR gain at the 10^-5 bit error rate in comparison with the conventional Rake reception in 2BOK