Methods and apparatus for signal and timing detection in wireless communication systems
View Patent ↗In accordance with a detection method in a wireless communication system, an initial hypothesis for a starting position of a desired signal within a received wireless communication signal may be determined. The desired signal may have a conjugate symmetric property. At least one correlation value may be determined based on the initial hypothesis. The at least one correlation value may indicate the extent to which at least one sample sequence selected from the received signal has the conjugate symmetric property.
1. A detection method in a wireless device, comprising:
determining an initial hypothesis for a starting position of a desired signal within a received signal, wherein the desired signal has a conjugate symmetric property; and
determining at least one correlation value based on the initial hypothesis, wherein the at least one correlation value indicates the extent to which at least one sample sequence selected from the received signal has the conjugate symmetric property and is determined using circular convolution.
2. The method of claim 1 , wherein the wireless device is part of a wireless communication system that utilizes orthogonal frequency division multiplexing, and wherein the desired signal comprises a preamble signal.
3. The method of claim 1 , wherein the at least one correlation value is determined in at least one of a frequency domain and a time domain.
4. The method of claim 1 , wherein the initial hypothesis is determined using a coarse detection method.
5. The method of claim 1 , further comprising setting samples y(n 0 +1) and
y
(
n
0
+
N
2
+
1
)
equal to zero, wherein y( )represents the received signal, n 0 represents a hypothesis for the starting position of the desired signal within the received signal and N represents number of samples of the received signal that are under consideration.
6. The method of claim 1 , further comprising:
generating a threshold value; and
comparing the at least one correlation value with the threshold value.
7. A wireless device, comprising:
a coarse detector that is configured to determine an initial hypothesis for a starting position of a desired signal within a received signal, wherein the desired signal has a conjugate symmetric property; and
a correlator that is configured to determine at least one correlation value based on the initial hypothesis, wherein the at least one correlation value indicates the extent to which at least one sample sequence selected from the received signal has the conjugate symmetric property and is determined using circular convolution.
8. The wireless device of claim 7 , wherein the wireless device is part of a wireless communication system that utilizes orthogonal frequency division multiplexing, and wherein the desired signal comprises a preamble signal.
9. The wireless device of claim 7 , wherein the at least one correlation value is determined in at least one of a frequency domain and a time domain.
10. The wireless device of claim 7 , wherein the correlator is also configured to set samples y(n 0 +1) and
y
(
n
0
+
N
2
+
1
)
equal to zero, wherein y( ) represents the received signal, n 0 represents a hypothesis for the starting position of the desired signal within the received signal and N represents number of samples of the received signal that are under consideration.
11. The wireless device of claim 7 , further comprising:
a threshold generator that is configured to generate a threshold value; and
a detector that is configured to compare the at least one correlation value with the threshold value.
12. The wireless device of claim 7 , wherein the wireless device is at least part of a mobile handset.
13. The wireless device of claim 7 , wherein the wireless device is at least part of a base station.
14. An apparatus, comprising:
means for determining an initial hypothesis for a starting position of a desired signal within a received signal, wherein the desired signal has a conjugate symmetric property; and
means for determining at least one correlation value based on the initial hypothesis, wherein the at least one correlation value indicates the extent to which at least one sample sequence selected from the received signal has the conjugate symmetric property and is determined using circular convolution.
15. The apparatus of claim 14 , wherein the apparatus is part of a wireless communication system that utilizes orthogonal frequency division multiplexing, and wherein the desired signal comprises a preamble signal.
16. The apparatus of claim 14 , wherein the at least one correlation value is determined in at least one of a frequency domain and a time domain.
17. The apparatus of claim 14 , wherein the initial hypothesis is determined using a coarse detection method.
18. The apparatus of claim 14 , further comprising means for setting samples y(n 0 +1) and
y
(
n
0
+
N
2
+
1
)
equal to zero, wherein y( )represents the received signal, n 0 represents a hypothesis for the starting position of the desired signal within the received signal and N represents number of samples of the received signal that are under consideration.
19. The apparatus of claim 14 , further comprising:
means for generating a threshold value; and
means for comparing the at least one correlation value with the threshold value.
20. A computer-program product for performing detection in a wireless communication device, the computer-program product comprising a non-transitory computer readable medium having instructions thereon, the instructions comprising:
code for determining an initial hypothesis for a starting position of a desired signal within a received signal, wherein the desired signal has a conjugate symmetric property; and
code for determining at least one correlation value based on the initial hypothesis, wherein the at least one correlation value indicates the extent to which at least one sample sequence selected from the received signal has the conjugate symmetric property and is determined using circular convolution.
21. The computer-program product of claim 20 , wherein the wireless device is part of a wireless communication system that utilizes orthogonal frequency division multiplexing, and wherein the desired signal comprises a preamble signal.
22. The computer-program product of claim 20 , wherein the at least one correlation value is determined in at least one of a frequency domain and a time domain.
23. The computer-program product of claim 20 , wherein the initial hypothesis is determined using a coarse detection method.
24. The computer-program product of claim 20 , further comprising code for setting samples y(n 0 +1) and
y
(
n
0
+
N
2
+
1
)
equal to zero, wherein y( ) represents the received signal, n 0 represents a hypothesis for the starting position of the desired signal within the received signal and N represents number of samples of the received signal that are under consideration.
25. The computer-program product of claim 20 , further comprising:
code for generating a threshold value; and
code for comparing the at least one correlation value with the threshold value.