Method and apparatus for scheduling switched multibeam...

Details Method and apparatus for scheduling switched multibeam... Method and apparatus for scheduling switched multibeam...

2005-11-22

2005-11-22

Fan, Chieh M. (Department: 2634)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S147000, C375S148000, C375S316000

Reexamination Certificate

active

06968022

ABSTRACT:
The invention is a switched beam beamforming method and apparatus for wireless communication receiving stations utilizing an array of antenna elements in which only a single beam is generated at any given instant and the beam is switched at a very high rate, e.g., faster than the data rate of the system. An algorithm for scheduling the beamforming sequence is disclosed that optimizes performance by optimizing the signal/interference-plus-noise ratio for a given set of conditions at any instant in time. In particular, spatial diversity offered by antenna arrays for direct sequence-code division multiple access communication systems is exploited by an intelligent switched beam antenna at radio frequency level. The design is optimized to yield conditional mean estimates of the communication channel during uplink transmission and compute minimum variance estimates of the communication channel by optimally combining the signals of the spatially distributed antennas at chip rate.

REFERENCES:
patent: 5844951 (1998-12-01), Proakis et al.
patent: 5903826 (1999-05-01), Nowak
patent: 5933446 (1999-08-01), Bond et al.
patent: 6141335 (2000-10-01), Kuwahara et al.
Chang et al, “Chip-Level Beamforming vs. Symbol-Level Beamforming in Coherent CDMA Adaptive Antenna Array Systems”, Jun. 1999, Communications, 1999. ICC '99. 1999 IEEE International Conference on; page(s): 1588-1592 vol. 3.

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