Adjustable transmit diversity
View Patent ↗Systems and methods for adjustable transmit diversity (adjustable PSTD) are provided. A base station transmits information to a mobile station over two antennas. Using information received from the mobile station related to channel conditions, the base station can adjust a frequency offset between the information transmitted over the two antennas.
1. A method for a base station transmitting information to a mobile station, the method comprising the acts of:
transmitting information over a first antenna to the mobile station at a first frequency;
transmitting the information over a second antenna to the mobile station at a second frequency;
receiving information from the mobile station related to signal quality; and
adjusting a sweeping frequency of the transmission of information over one of the first and second antennas based on the received information;
wherein the sweeping frequency is added to one of the first frequency and the second frequency, and the first and second frequency are within a single channel.
2. The method of claim 1 , wherein the frequency of the transmission is adjusted by 50 or 100 Hertz.
3. The method of claim 2 , wherein the information is transmitted over the first and second antennas at different frequencies.
4. The method of claim 1 , wherein the information received from the mobile station is a frame error rate.
5. The method of claim 1 , wherein the information received from the mobile station is a signal-to-noise ratio.
6. The method of claim 1 , wherein the information is transmitted to the mobile station using code division multiple access transmission.
7. The method of claim 1 , wherein the mobile station is not explicitly informed of the adjustment.
8. The method of claim 1 , wherein the information is transmitted over the first antenna at a first frequency and the information is transmitted over the second antenna at the same first frequency.
9. A base station comprising:
a first antenna;
a second antenna; and
a processor, the processor comprising:
logic for controlling transmission of information over a first antenna to the mobile station at a first frequency;
logic for controlling transmission of information over a second antenna to the mobile station at a second frequency;
logic for receiving information from the mobile station related to signal quality; and
logic for adjusting a sweeping frequency of the transmission of information over one of the first and second antennas based on the received information;
wherein the sweeping frequency is added to one of the first frequency and the second frequency, and the first and second frequency are within a single channel.
10. The base station of claim 9 , wherein the frequency of the transmission is adjusted by 50 or 100 Hertz.
11. The base station of claim 10 , wherein the information is transmitted over the first and second antennas at different frequencies.
12. The base station of claim 9 , wherein the information received from the mobile station is a frame error rate.
13. The base station of claim 9 , wherein the information received from the mobile station is a signal-to-noise ratio.
14. The base station of claim 9 , wherein the information is transmitted to the mobile station using code division multiple access transmission.
15. The base station of claim 9 , wherein the mobile station is not explicitly informed of the adjustment.
16. The base station of claim 9 , wherein the information is transmitted over the first antenna at a first frequency and the information is transmitted over the second antenna at the same first frequency.
17. The base station of claim 9 , wherein the information is transmitted over the first antenna at a first frequency and the information is transmitted over the second antenna at a second frequency.