Title :
Update Rate of Channel Estimation for UMTS-HSDPA in Time-Varying Channels
Author :
Freudenthaler, Klemens ; Springer, Andreas ; Wehinger, Joachim ; Mecklenbrauker, Christoph F.
Author_Institution :
Johannes-Kepler Univ. Linz
Abstract :
We investigate the update rate for channel estimation in time-varying channels for UMTS-HSDPA. Our channel estimator is based on correlation of the received chip stream and the known pilot stream. This results in an averaging of the estimated channel over a block. First, we investigate the influence of the update rate by averaging over the perfectly known channel at the receiver. This corresponds to the upper bound for block averaging. Second, we examine the throughput by averaging over correlation based channel estimation. We find specific update rates for the ITU-channel models PB3, VA30, and VA120 in combination with RAKE reception or LMMSE equalization for 16-QAM symbol constellation
Keywords :
3G mobile communication; access protocols; channel estimation; least mean squares methods; packet radio networks; quadrature amplitude modulation; time-varying channels; 16-QAM symbol constellation; ITU-channel models PB3; LMMSE equalization; RAKE reception; UMTS-HSDPA; VA120; VA30; block averaging; channel estimation; chip stream; pilot stream; time-varying channels; update rate; 3G mobile communication; Channel estimation; Downlink; Equalizers; Modulation coding; Multiaccess communication; RAKE receivers; Throughput; Time-varying channels; Upper bound;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd
Conference_Location :
Melbourne, Vic.
Print_ISBN :
0-7803-9391-0
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2006.1683152
