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AssigneesThe Board of Trustees of the Leland Stanford Jr. University, Cisco Technology, Inc.
InventorsGregory Gene Raleigh, Suhas Nagraj Diggavi, Vincent Knowles Jones, IV, Arogyaswami Joseph Paulraj
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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.
In a communications system including a first communications station and a second communications station, said first communications station having a transmitter antenna array for generating an antenna beam pattern used for transmission of information signals to said second communications station, a method for adaptively forming said beam pattern comprising:
A central communication station for adaptively forming a transmission beam pattern to communicate with a remote communications station using a transmitter antenna array, comprising:
Dependencies are inferred from the claim text.