Method and system for generating a power control metric in an orthogonal transmit diversity communication system
AssigneeMotorola, Inc.
InventorsKiran Kuchi, Mansoor Ahmed
Life of this patent
Estimating the term…
Abstract
In a wireless communications system having a transmitter that transmits a transmit diversity signal using multiple antennas, a channel quality metric is computed by measuring a first and second diversity branch signal quality for first and second diversity branches in the receiver. Thereafter, the channel quality metric is computed in response to a difference between the first and second diversity branch signal qualities. The first and second diversity branch signal quality measurements may be signal-to-noise measurements. In one embodiment, the channel quality metric is computed by taking a square root of a product of signal-to-noise ratios of the first and second diversity branches in the receiver.
Claims16
A method for computing a channel quality metric in a receiver in a wireless communications system, wherein a transmitter in the wireless communications system transmits a transmit diversity signal using multiple antennas, the method comprising the steps of:
- measuring a first and second diversity branch signal quality for the transmit diversity signal received in first and second diversity branches in the receiver;
- computing an imbalance compensation factor that is a function of a difference between the first and second diversity branch signal qualities;
- and
- computing the channel quality metric in response to the imbalance compensation factor.
A system for computing a channel quality metric in a receiver in a wireless communications system, wherein a transmitter in the wireless communications system transmits a transmit diversity signal using multiple antennas, the system comprising:
- means for measuring a first and second diversity branch signal quality for the transmit diversity signal received in first and second diversity branches in the receiver;
- means for computing an imbalance compensation factor that is a function of a difference between the first and second diversity branch signal qualities;
- and
- means for computing the channel quality metric in response to the imbalance compensation factor.
A system for computing a channel quality metric in a receiver in a wireless communications system, wherein a transmitter in the wireless communications system transmits a transmit diversity signal using multiple antennas, the system comprising:
- first and second diversity branch signal quality measurers for producing first and second diversity branch quality signals in the receiver in response to receiving the transmit diversity signal;
- and
- a channel quality metric computer, coupled to the first and second diversity branch quality signals, for producing a channel quality metric in response to an imbalance compensation factor computed as a function of a difference between the first and second diversity branch quality signals.
Dependencies are inferred from the claim text.