US 2010/0246494 A1 · System and Method for Communications Using Spatial Multiplexing with Incomplete Channel Information

Abstract

A system and method for communications using spatial multiplexing with incomplete channel information are provided. A method for wireless communications includes receiving, at a controller, a reference signal transmitted by a communications device, computing channel statistics based on the received reference signal, computing a first beamforming vector and a second beamforming vector, and transmitting information to the communications device. The reference signal being transmitted using a subset of antennas used for data reception at the communications device, and the controller and the communications device utilize cross-polarized antennas. The computing being based on the channel statistics, the transmitting uses the first beamforming vector and the second beamforming vector, the first beamforming vector precodes information for a first antenna at the communications device, and the second beamforming vector precodes information for a second antenna at the communications device.

Claims23

Dependent claims

A method for wireless communications, the method comprising:

receiving, at a controller, a reference signal transmitted by a communications device, wherein the reference signal is transmitted using a subset of antennas used for data reception at the communications device, wherein the controller and the communications device utilize cross-polarized antennas;
computing channel statistics based on the received reference signal;
computing a first beamforming vector and a second beamforming vector, wherein the computing is based on the channel statistics;
and
transmitting information to the communications device, wherein the transmitting uses the first beamforming vector and the second beamforming vector, wherein the first beamforming vector precodes information for a first antenna at the communications device, and wherein the second beamforming vector precodes information for a second antenna at the communications device.

2 more elements

A communications controller comprising:

a receiver configured to receive a reference signal transmitted by a communications device, wherein the communications device transmits with a subset of antennas used for receiving information;
a beamforming vector compute unit coupled to the receiver, the beamforming vector compute unit configured to compute beamforming vectors for a communications device based on estimates of elements of correlation matrices for antennas in the subset of antennas based on a transmission of the reference signal by the communications device;
and
a beamforming unit coupled to the receiver and to the beamforming vector compute unit, the beamforming unit configured to precode data to be transmitted to the communications device with the beamforming vectors computed by the beamforming vector compute unit for the communications device.

1 more element

Dependencies are inferred from the claim text.

System and Method for Communications Using Spatial Multiplexing with Incomplete Channel Information

Life of this patent

System and Method for Communications Using Spatial Multiplexing with Incomplete Channel Information

Life of this patent

Abstract

Claims23