Power control with signal quality estimation for smart antenna communications systems
View Patent ↗A method for power control with signal quality estimation for smart antenna communications system is described. The method, for example, starts with a transmit power assignment. Receive weight vector determination is carried out with this assigned transmit power, and the new weights used. An estimate of the resulting received signal quality is obtained and used for another power adjustment.
1. A method comprising:
transmitting a first radio signal from a first radio station to a second radio station, the first signal being sent according to a first power assignment and a first spatial weight vector;
receiving from the second station a quality of the first signal;
determining at the first station a second power assignment based on the received quality of the first signal; and
transmitting a second radio signal from the first station to the second station using the second power assignment.
2. The method of claim 1 , further comprising:
determining a second spatial weight vector at the first station based on the received quality of the first signal,
wherein transmitting the second signal comprises transmitting the second signal using the second power assignment and the second spatial weight vector.
3. The method of claim 2 , wherein the second power assignment is applied as a scaling factor to the second spatial weight vector.
4. The method of claim 1 , further comprising:
setting up an initial power assignment and spatial weight vector as the first power assignment and the first spatial weight vector, the initial assignments being the same for all radios to which the first station transmits a first signal.
5. The method of claim 1 , wherein receiving from the second station comprises receiving an uplink signal.
6. A machine-readable storage medium comprising data that when operated on by a machine causes the machine to perform operations comprising:
transmitting a first radio signal from a first radio station to a second radio station, the first signal being sent according to a first power assignment and a first spatial weight vector;
receiving from the second radio station a quality of the first signal;
determining a second power assignment based on the received quality of the first signal; and
transmitting a second radio signal from the first radio station to the second radio station using the second power assignment.
7. The machine-readable storage medium of claim 6 , the operations further comprising:
determining a second spatial weight vector at the first station based on the received quality of the first signal, wherein transmitting the second signal comprises transmitting the second signal using the second power assignment and the second spatial weight vector.
8. The machine-readable storage medium of claim 6 , the operations further comprising:
repeating at least a portion of:
transmitting an additional radio signal to the second station; receiving a quality of the additional signal from the second station;
determining an additional power assignment based on the received quality;
determining an additional spatial weight vector based on the received quality; and
transmitting an additional signal to the second station using the determined additional power assignment and the determined additional spatial weight vector.
9. A radio station comprising:
a transmitter to transmit a first radio signal from the radio station to a second radio station, the first signal being sent according to a first power assignment and a first spatial weight vector;
a receiver to receive from the second radio station a quality of the first signal; and
a signal processor to determine a second power assignment based on the received quality of the first signal,
wherein the transmitter is further operable to transmit a second radio signal from the first radio station to the second radio station using the second power assignment.
10. The radio station of claim 9 , wherein the signal processor is further to determine a second spatial weight vector based on the received quality of the first signal, wherein the transmitter is further to transmit the second signal using the second power assignment and the second spatial weight vector.
11. The radio station of claim 10 , wherein the signal processor applies the second power assignment as a scaling factor to the second spatial weight vector.
12. The radio station of claim 9 , wherein the transmitter transmits to a plurality of second radio stations as a base station in cellular radio communication system and wherein the signal processor further sets up an initial power assignment and spatial weight vector as the first power assignment and the first spatial weight vector, the initial assignments being the same for all radios to which the transmitter transmits a first signal.