Title :
TX selection diversity with prediction: systematic nonadaptive predictor design
Author :
Wittneben, A. ; Kaltenschnee, T.
Author_Institution :
ASCOM Tech Ltd., Maegenwil, Switzerland
Abstract :
In a time division duplex personal communications system uplink and downlink use different time slots on the same carrier. This makes transmit antenna selection diversity possible to combat performance loss in slow fading channels. The best transmit antenna is selected on the basis of signal measurements in preceding receive time slots. Previously proposed selection algorithms have poor performance, if the signal measurements are corrupted by noise. The structure of the optimum selection algorithm for noisy coherent signal measurements is reviewed. It involves an adaptive linear predictor. The design of an optimum nonadaptive predictor is described and the error performance of a system with DECT-like parameters is given. Almost the full diversity gain can be maintained for mobile speeds up to 12 km/h
Keywords :
cordless telephone systems; diversity reception; fading; land mobile radio; personal communication networks; time division multiplexing; time-varying channels; DECT-like parameters; TX selection diversity; adaptive linear predictor; diversity gain; downlink; noisy coherent signal measurements; optimum nonadaptive predictor; optimum selection algorith; performance loss; selection algorithms; slow fading channels; systematic nonadaptive predictor; time division duplex personal communications system; transmit antenna selection diversity; uplink; Antenna measurements; Downlink; Fading; Noise measurement; Performance loss; Propagation losses; Receiving antennas; Slot antennas; Time measurement; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
Print_ISBN :
0-7803-1927-3
DOI :
10.1109/VETEC.1994.345292
