Title :
Pilot-Channel-Assisted Log-Likelihood-Ratio Selective Combining for Low-Rate DS-UWB Communications
Author :
Chu, Xiaoli ; Ghavami, Mohammad ; Murch, Ross
Author_Institution :
Div. of Eng., King´´s Coll. London, London
Abstract :
In this paper, we propose a pilot-channel-assisted log-likelihood-ratio selective combining (PCA-LLR-SC) scheme for Rake receivers that will be used in long-range low-rate UWB communications targeted by the IEEE 802.15.4a specification. The pilot and data channels are constructed using quadrature sinusoidal bursts that have the same Gaussian envelope. The system parameters are optimized through jointly minimizing the channel estimation mean square error and maximizing the receiver output signal-to-noise ratio. Simulation results show that the proposed PCA-LLR-SC scheme is able to provide robust low-rate UWB communications in fast-fading multipath channels.
Keywords :
Gaussian channels; channel estimation; fading channels; mean square error methods; multipath channels; radio receivers; ultra wideband communication; Gaussian envelope; IEEE 802.15.4a specification; Rake receiver; channel estimation; data channel; fading multipath channels; low-rate DS-UWB communication; mean square error; pilot-channel-assisted log-likelihood-ratio selective combining; quadrature sinusoidal burst; signal-to-noise ratio; Channel estimation; Delay effects; Fading; Fingers; Mean square error methods; Multipath channels; Physical layer; RAKE receivers; Signal to noise ratio; Ultra wideband communication;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.735
