Reduced feedback transmit beamforming
US8233556B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2007 |
| Grant date | Jul 31, 2012 |
| Priority date | — |
| Expiry date | Oct 26, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and system for reduced feedback transmit beamforming computes a matrix of channel transfer function coefficients. The matrix of channel transfer function coefficients is compressed by applying a rotation matrix having orthogonal columns to the matrix of channel transfer function coefficients to produce a compressed transfer function matrix having a reduced number of non-zero coefficients. The compressed matrix is fed back to a transmitting unit. Decompression of the transfer function coefficient matrix is not required. This compression does not cause any performance degradation for transmit beamforming. The transmitting unit computes a set of beamsteering coefficients from the compressed matrix and applies the coefficients to signals prior to transmission. The beamformed signals are transmitted to the receiving unit and post-coded to allow the receiving unit to see an effective diagonalized channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.