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This paper proposes probability-based rake receiver (PRR) as a new concept of error concealment in ultra-wideband multiple access systems in the presence of frequency-selective fading according to the COST 207 channel model. To form a beam pattern, after despreading with specified user code and signal integrating by a bank of integrator, signal weights are calculated based on signal strength at each...
This paper proposes a low complex frequency domain channel estimation for ultra-wideband indoor environment. The channel parameters are the attenuations and delays incurred by the signal echoes along the propagation paths. Time-hopping (TH) modulation with binary symbols is assumed. Codewords span a transmission frame. Frames are separated by a guard time to cope with the channel time dispersion....
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