Adaptive beam forming for transmitter operation in a wireless co

Details Adaptive beam forming for transmitter operation in a wireless co Adaptive beam forming for transmitter operation in a wireless co

1995-06-16

2000-08-08

Tsang, Fan

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455456, 455 65, 4552761, 342367, 375232, H04Q 730

Patent

active

061013994

ABSTRACT:
A method for forming an adaptive phased array transmission beam pattern at a base station without any knowledge of array geometry or mobile feedback is described. The approach is immune to the problems which plague methods which attempt to identify received angles of arrival from the mobile and map this information to an optimum transmit beam pattern. In addition, this approach does not suffer the capacity penalty and mobile handset complexity increase associated with mobile feedback. Estimates of the receive vector propagation channels are used to estimate transmit vector channel covariance matrices which form objectives and constraints in quadratic optimization problems leading to optimum beam former solutions for the single user case, and multiple user case. The new invention in capable of substantial frequency re-use capacity improvement in a multiple user cellular network.

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Per Zetterberg, The Spectrum Efficiency of a Basestation Antenna Array System For Spatially Selective Transmission , Jan. 24, 1994, pp. 1-37.
Per Zetterberg, Bjorn Ott4ersten, Experiments using an Antenna Array in a Mobile Communications Environment , Apr. 21, 1994, 5 pages.

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