Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2007-10-23
2007-10-23
Sobutka, Philip J. (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S063400, C455S273000
Reexamination Certificate
active
10688770
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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Diggavi Suhas Nagraj
Jones, IV Vincent Knowles
Paulraj Arogyaswami Joseph
Raleigh Gregory Gene
Cisco Technology Inc.
Kaplan Cindy
Sobutka Philip J.
The Board of Trustees of the Leland Stanford Jr. University
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