Slowing the observed rate of channel fluctuations in a...

Details Slowing the observed rate of channel fluctuations in a... Slowing the observed rate of channel fluctuations in a...

2006-02-14

2006-02-14

Nguyen, Lee (Department: 2682)

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

C455S065000, C455S101000, C455S103000, C455S276100, C455S504000, C342S370000

Reexamination Certificate

active

06999724

ABSTRACT:
A method and apparatus for reducing the observed rate of change of the channel characteristics in a system with multiple antennas at a mobile terminal. The slowing down of the observed channel fluctuations is effectuated on the downlink by either calculating or receiving signals that have a similar Doppler shift, referred to herein as Doppler-compensatable signals, and processing one or more of the Doppler-compensatable signals to compensate for Doppler shift. The slowing down of the observed channel fluctuations is effectuated on the uplink by pre-compensating symbol streams with the Doppler shift associated with the direction in which they are transmitted, so that the observed Doppler shift of these signals when they are received is reduced or even eliminated.

REFERENCES:
patent: 3757335 (1973-09-01), Gruenberg
patent: 2003/0053412 (2003-03-01), Yoshida et al.
T. L. Marzetta, “BLAST Training: Estimating Channel Characteristics for High Capacity Space-Time Wireless”, Proceedings 37thAnnual Allerton Conference on Communication, Control, and Computing, Monticello, IL, 9 pages, Sep. 22-24, 1999.
H. Xu, et als., “Spatial and Temporal Variations of MIMO Channels and Impacts on Capacity”, IEEE International Conference on Communications, 2002. ICC 2002., vol. 1, pp. 262-266.

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