US 7,139,324 B1 · Closed loop feedback system for improved down link performance

Abstract

A method includes receiving at least two space-time coded signals from an antenna system associated with a first station, determining complex channel state information based on the received space-time coded signals, and sending the complex channel state information to the first station. In an alternative embodiment, a method includes transmitting at least two space-time coded signals in respective beams of a multi-beam antenna array, measuring a channel impulse response for each space-time coded signal at a second station, and sending an indicia of a selected set of least attenuated signals from the second station to the first station. The multi-beam antenna array is associated with a first station. The beams transmit a signature code embedded in each respective space-time coded signal, and the signature codes are orthogonal so that the second station can separate and measure the channel impulse response corresponding to each space-time coded signal.

Claims35

Dependent claims

A method comprising steps of:

receiving at least two space-time coded signals from an antenna system associated with a first station;
determining complex channel state information based on the received space-time coded signals;
segmenting the complex channel state information into a plurality of channel state information segments;
and
sending the complex channel state information to the first station, wherein the step of sending the complex channel state information includes sending the plurality of channel state information segments in a sequence.

2 more elements

A system comprising a remote station, the remote station including:

a receiver to receive at least two space-time coded signals from an antenna system;
a processor to determine complex channel state information from the received space-time coded signals;
and
a transmitter to send the complex channel state information to a base station,
wherein the processor includes a processor module to segment the complex channel state information into a plurality of channel state information segments;
and the transmitter includes circuitry to send the complex channel state information in a sequence of the channel state information segments;
and wherein said processor module includes:
logic to determine a number of phase bits allocated for phase information according to a mode of operation;
logic to shorten a correction phase angle to fit into the number of phase bits;
logic to determine a number of amplitude bits allocated for amplitude information according to the mode of operation;
and
logic to shorten a correction amplitude according to the number of amplitude bits.

9 more elements

Dependencies are inferred from the claim text.

Closed loop feedback system for improved down link performance

Life of this patent

Closed loop feedback system for improved down link performance

Life of this patent

Abstract

Claims35