Method and apparatus for adaptive transmission beam forming in a wireless communication system
US6665545B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | May 2, 2000 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | May 2, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.