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US 7,599,666 B2Granted
Communication system and method using transmit diversity
AssigneeNokia Corporation
InventorsJyri Hamalainen, Risto Wichman
Life of this patent
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Abstract
Influencing the transmission of signals from a transmitting device to a receiving device in a communication system comprising at least one transmitting device and at least one receiving device is disclosed. In a receiving station received transmission signals are processed and a feedback signal to be transmitted to a transmitting device is generated on the basis of the processed signals. Then, transmit weights to be applied to transmission signals are determined in accordance with the feedback signal.
Claims15
An apparatus comprising:
- a receiver configured to receive a feedback signal transmitted from a receiving device;
- and
- a processor configured to
- process feedback information received from the receiving device during a certain time period, the feedback information including the feedback signal and previous feedback signals received from the receiving device,
- determine transmit weights to be applied to transmission signals to be transmitted from the transmitting device to the receiving device in accordance with the feedback information, and
- select a feedback mode and a corresponding feedback word length on the basis of the feedback information,
- wherein the feedback signal comprises a feedback word which is to be generated by the receiving device according to the feedback mode selected by the transmitting device,
- wherein the processor is configured to control the corresponding feedback word length in accordance with temporal properties of a channel between the transmitting device and the receiving device by comparing previous feedback words and detecting the change in the feedback words of same length and selecting the corresponding feedback word length in accordance with the detected change in the feedback words.
5 more elements
A method comprising:
- receiving, at a transmitting device, a feedback signal transmitted from a receiving device;
- processing, by the transmitting device, feedback information received from the receiving device during a certain time period, the feedback information including the feedback signal and previous feedback signals received from the receiving device;
- determining, by the transmitting device, transmit weights to be applied to transmission signals to be transmitted from the transmitting device to the receiving device, in accordance with the feedback information;
- and
- selecting, by the transmitting device, a feedback mode and a corresponding feedback word length on the basis of the feedback information,
- wherein the feedback signal comprises a feedback word which is to be generated according to the feedback mode selected by the transmitting device,
- wherein the corresponding feedback word length is controlled in accordance with temporal properties of a channel between the transmitting device and the receiving device, and
- wherein the controlling of the corresponding feedback word length comprises
- comparing previous feedback words and detecting the change in the feedback words of same length;
- and
- selecting the corresponding feedback word length in accordance with the detected change in the feedback words.
8 more elements
An apparatus comprising:
- receiving means for receiving, at a transmitting device, a feedback signal transmitted from a receiving device;
- processing means for processing feedback information received from the receiving device during a certain time period, the feedback information including the feedback signal and previous feedback signals received from the receiving device;
- determining means for determining transmit weights to be applied to transmission signals to be transmitted from the transmitting device to the receiving device, in accordance with the feedback information;
- selecting means for selecting a feedback mode and a corresponding feedback word length on the basis of the feedback information, wherein the feedback signal comprises a feedback word which is to be generated according to the feedback mode selected by the transmitting device;
- and
- controlling means for controlling the corresponding feedback word length in accordance with temporal properties of a channel between the transmitting device and the receiving device,
- wherein the controlling means comprises
- comparing means for comparing previous feedback words and detecting the change in the feedback words of same length;
- and
- selecting means for selecting the corresponding feedback word length in accordance with the detected change in the feedback words.
7 more elements
Dependencies are inferred from the claim text.