System and method of selecting antennas based on signal-to-noise ratios and signal quality values

1. A system comprising:

a receiver configured to receive (i) a first signal via a first antenna, and (ii) one of the first signal and a second signal via a second antenna;

at least one processor configured to determine (i) based on the first signal as received at the first antenna, a first signal-to-noise ratio and a first signal quality value, and (ii) based on the one of the first signal and the second signal as received at the second antenna, a second signal-to-noise ratio and a second signal quality value, wherein the first signal-to-noise ratio is different than the first signal quality value, and wherein the second signal-to-noise ratio is different than the second signal quality value; and

a decision device configured to select one of the first antenna and the second antenna based on

a difference between the first signal-to-noise ratio and the second signal-to-noise ratio if the first signal-to-noise ratio is greater than the second signal-to-noise ratio, or

the first signal quality value and the second signal quality value if the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is less than a predetermined threshold.

2. The system of claim 1 , wherein the at least one processor comprises:

a first processor configured to determine (i) based on the first signal as received at the first antenna, the first signal-to-noise ratio, and (ii) based on the one of the first signal and the second signal as received at the second antenna, the second signal-to-noise ratio; and

a second processor configured to determine (i) based on the first signal as received at the first antenna, the first signal quality value, and (ii) based on the one of the first signal and the second signal as received at the second antenna, the second signal quality value.

3. The system of claim 1 , wherein:

the first signal quality value is a first peak-to-average ratio; and

the second signal quality value is a second peak-to-average ratio.

4. The system of claim 3 , wherein the decision device is configured to select (i) the first antenna if the first peak-to-average ratio is greater than the second peak-to-average ratio, and (ii) the second antenna if the second peak-to-average ratio is greater than the first peak-to-average ratio.

5. The system of claim 1 , wherein the decision device is configured to select (i) the first antenna if the first signal quality value is greater than the second signal quality value, and (ii) the second antenna if the second signal quality value is greater than the first signal quality value.

6. The system of claim 1 , wherein the decision device is configured to:

determine which one the first signal-to-noise ratio and the second signal-to-noise ratio is larger; and

if the difference is greater than the predetermined threshold,

select the first antenna if the first signal-to-noise ratio is greater than the second signal-to-noise ratio, and

select the second antenna if the second signal-to-noise ratio is greater than the first signal-to-noise ratio.

7. The system of claim 1 , wherein:

the receiver is configured to receive the second signal via the second antenna;

the at least one processor is configured to

determine, based on the second signal as received at the second antenna, the second signal-to-noise ratio and the second signal quality value, and

determine which one the first signal-to-noise ratio and the second signal-to-noise ratio is larger; and

the decision device is configured to, if the difference is greater than the predetermined threshold, select one of the first antenna and the second antenna based on the first signal-to-noise ratio and the second signal-to-noise ratio.

8. The system of claim 7 , wherein the decision device is configured to, if the difference is greater than the predetermined threshold:

select the first antenna if the first signal-to-noise ratio is greater than the second signal-to-noise ratio; and

select the second antenna if the second signal-to-noise ratio is greater than the first signal-to-noise ratio.

9. The system of claim 1 , wherein:

the at least one processor is configured

receive a plurality of signals, each of the plurality of signals is received by a respective one of a plurality of antennas, wherein the plurality of signals include the first signal and the second signal, and wherein the plurality of antennas include the first antenna and the second antenna, and

determine which one of the plurality of signals has a largest signal-to-noise ratio; and

the decision device is configured to select the one of the plurality of antennas receiving the one of the plurality of signals with the largest signal-to-noise ratio.

10. The system of claim 1 , wherein:

the at least one processor is configured to

receive a plurality of signals, each of the plurality of signals is received by a respective one of a plurality of antennas, wherein the plurality of signals include the first signal and the second signal, and wherein the plurality of antennas include the first antenna and the second antenna, and

determine

which one of the plurality of signals has a largest signal-to-noise ratio, and

differences between (i) the largest signal-to-noise ratio of the one of the plurality of signals, and (ii) signal-to-noise ratios of other ones of the plurality of signals; and

the decision device is configured to, if each of the differences is greater than the predetermined threshold, select the one of the plurality of antennas which received the one of the plurality of signals with the largest signal-to-noise ratio.

11. The system of claim 10 , wherein:

the at least one processor is configured to determine a plurality of signal quality values for the plurality of signals, wherein the plurality of signal quality values include the first signal quality value and the second signal quality value; and

the decision device is configured to, if one of the differences is less than the predetermined threshold, select the one of the plurality of antennas based on the plurality of signal quality values.

12. The system of claim 1 , wherein:

the at least one processor is configured to

receive a plurality of signals, each of the plurality of signals is received by a respective one of a plurality of antennas, wherein the plurality of signals include the first signal and the second signal, and wherein the plurality of antennas include the first antenna and the second antenna, and

determine

which one of the plurality of signals has a largest signal quality value, and

differences between (i) a largest signal quality value of the one of the plurality of signals, and (ii) signal quality values of other ones of the plurality of signals; and

the decision device is configured to, if each of the differences is greater than a second predetermined threshold, select the one of the plurality of antennas which received the one of the plurality of signals with the largest signal quality value.

13. The system of claim 12 , wherein:

the at least one processor is configured to determine which one of the plurality of signals has a largest signal-to-noise ratio; and

the decision device is configured to, if one of the differences is less than the second predetermined threshold, select the one of the plurality of antennas which received the one of the plurality of signals with the largest signal-to-noise ratio.

14. A method comprising:

receiving (i) a first signal via a first antenna, and (ii) one of the first signal and a second signal via a second antenna;

determining (i) based on the first signal as received at the first antenna, a first signal-to-noise ratio and a first signal quality value, and (ii) based on the one of the first signal and the second signal as received at the second antenna, a second signal-to-noise ratio and a second signal quality value, wherein the first signal-to-noise ratio is different than the first signal quality value, and wherein the second signal-to-noise ratio is different than the second signal quality value; and

selecting one of the first antenna and the second antenna based on

a difference between the first signal-to-noise ratio and the second signal-to-noise ratio if the first signal-to-noise ratio is greater than the second signal-to-noise ratio, or

the first signal quality value and the second signal quality value if the difference between the first signal-to-noise ratio and the second signal-to-noise ratio is less than a predetermined threshold.

15. The method of claim 14 , wherein:

the first signal quality value is a first peak-to-average ratio; and

the second signal quality value is a second peak-to-average ratio.

16. The method of claim 14 , further comprising:

determining which one the first signal-to-noise ratio and the second signal-to-noise ratio is larger; and

if the difference is greater than the predetermined threshold,

selecting the first antenna if the first signal-to-noise ratio is greater than the second signal-to-noise ratio, and

selecting the second antenna if the second signal-to-noise ratio is greater than the first signal-to-noise ratio.

17. The method of claim 14 , further comprising:

receiving the second signal via the second antenna;

determining, based on the second signal as received at the second antenna, the second signal-to-noise ratio and the second signal quality value; and

determining which one the first signal-to-noise ratio and the second signal-to-noise ratio is larger; and

if the difference is greater than the predetermined threshold, selecting one of the first antenna and the second antenna based on the first signal-to-noise ratio and the second signal-to-noise ratio.

18. The method of claim 14 , further comprising:

receiving a plurality of signals, wherein each of the plurality of signals is received by a respective one of a plurality of antennas, wherein the plurality of signals include the first signal and the second signal, and wherein the plurality of antennas include the first antenna and the second antenna;

determining which one of the plurality of signals has a largest signal-to-noise ratio; and

selecting the one of the plurality of antennas receiving the one of the plurality of signals with the largest signal-to-noise ratio.

19. The method of claim 14 , further comprising:

receiving a plurality of signals, wherein each of the plurality of signals is received by a respective one of a plurality of antennas, wherein the plurality of signals include the first signal and the second signal, and wherein the plurality of antennas include the first antenna and the second antenna, and

determining

which one of the plurality of signals has a largest signal-to-noise ratio, and

differences between (i) the largest signal-to-noise ratio of the one of the plurality of signals, and (ii) signal-to-noise ratios of other ones of the plurality of signals; and

if each of the differences is greater than the predetermined threshold, selecting the one of the plurality of antennas which received the one of the plurality of signals with the largest signal-to-noise ratio.

20. The method of claim 14 , further comprising:

receiving a plurality of signals, wherein each of the plurality of signals is received by a respective one of a plurality of antennas, wherein the plurality of signals include the first signal and the second signal, and wherein the plurality of antennas include the first antenna and the second antenna, and

determining

which one of the plurality of signals has a largest signal quality value,

differences between (i) a largest signal quality value of the one of the plurality of signals, and (ii) signal quality values of other ones of the plurality of signals; and

if each of the differences is greater than a second predetermined threshold, selecting the one of the plurality of antennas which received the one of the plurality of signals with the largest signal quality value.