Method and system for generating a power control metric in an orthogonal transmit diversity communication system
First Claim
1. 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.
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Accused Products
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.
111 Citations
16 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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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. - View Dependent Claims (8, 9, 10, 11, 12)
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13. 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:
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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. - View Dependent Claims (14, 15, 16)
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Specification