Method and apparatus for transmitting or detecting a primary synchronization signal
A method and apparatus for transmitting or detecting primary synchronization signal. The receiver receives primary synchronization signal from a transmitter, and detects the sequence used in the received primary synchronization signal by using three root indexes. Here, the primary synchronization signal is generated by using a Zadoff-Chu sequence having one of the three root indexes. The three root indexes comprise a first index and a second index, and a sum of the first index and the second index corresponds to the length of the Zadoff-Chu sequence.
1. A system, comprising:
a radio frequency module comprising a receiver for a mobile communication system that can receive a radio signal from a transmitter; and
a processor connected to the radio frequency module that can detect a sequence in the radio signal,
wherein the sequence is generated by utilizing a Zadoff-Chu sequence having one of indexes contained in a predetermined index set,
wherein the predetermined index set comprises a first index and a second index,
wherein a sum of the first index and the second index corresponds to a length of the Zadoff-Chu sequence, and
wherein the mobile communication system can utilize orthogonal frequency division multiplexing (OFDM).
2. The system of claim 1 , wherein the Zadoff-Chu sequence has an odd number length, and
wherein an equation for generating the sequence from the Zadoff-Chu sequence is based on the following equation:
exp
(
-
i
M
π
n
(
n
+
1
)
N
)
wherein the length of the Zadoff-Chu sequence is “N”, “M” is a root index of the Zadoff-Chu sequence, and “n” is index of each of constituent components of the sequence.
3. The system of claim 2 , wherein “N” is 63, the first index is 34, and the second index is 29.
4. The system of claim 1 , wherein the radio signal is a P-SCH (Primary-SCH) signal.
5. The system of claim 4 , wherein the receiver comprises a user equipment.
6. The system of claim 1 , wherein the receiver can perform synchronization with the transmitter based on sequence detection performed on the radio signal.
7. The system of claim 1 , wherein the radio signal is generated in a frequency domain.
8. The system of claim 1 , wherein the processor comprises an index Demapper.
9. A system, comprising:
a processor including a mapping module that can map a sequence generated by using a Zadoff-Chu sequence having one of indexes contained in a predetermined index set to resource elements, wherein the predetermined index set comprises a first index and a second index, wherein a sum of the first index and the second index corresponds to a length of the Zadoff-Chu sequence;
an Inverse Fast Fourier Transform (IFFT) converter module that can convert the sequence into a time-domain transmission signal; and
a radio frequency (RF) module comprising a transmitter for a mobile communication system that can transmit the time-domain transmission signal to at least one receiver,
wherein the mobile communication system can utilize orthogonal frequency division multiplexing (OFDM).
10. The system of claim 9 , wherein the Zadoff-Chu sequence has an odd number length, and
wherein an equation for generating the sequence from the Zadoff-Chu sequence is based on the following equation:
exp
(
-
i
M
π
n
(
n
+
1
)
N
)
wherein the length of the Zadoff-Chu sequence is “N”, “M” is a root index of the Zadoff-Chu sequence, and “n” is index of each of constituent components of the sequence.
11. The system of claim 10 , wherein “N” is 63, the first index is 34, and the second index is 29.
12. The system of claim 9 , wherein the system can utilize the sequence as a P-SCH (Primary-SCH) transmission sequence.
13. The system of claim 9 , wherein the system comprises a base station.
14. The system of claim 9 , wherein the sequence is generated in a frequency domain.
15. A system, comprising:
a radio frequency (RF) module including a receiver for a mobile communication system that can receive a radio signal from a transmitter in a network; and
a processor that can detect a sequence used in the radio signal,
wherein the sequence used in the radio signal corresponds to a Zadoff-Chu sequence having one of indexes contained in a predetermined index set,
wherein the predetermined index set comprises a first index and a second index, wherein a sum of the first index and the second index corresponds to a length of the Zadoff-Chu sequence, and wherein the system can perform synchronization.
16. The system of claim 15 , wherein the processor can detect the sequence using correlation operation.
17. The system of claim 15 , wherein the Zadoff-Chu sequence has an odd number length, and wherein the Zadoff-Chu sequence is based on the following equation:
exp
(
-
i
M
π
n
(
n
+
1
)
N
)
wherein the length of the Zadoff-Chu sequence is “N”, “M” is a root index of the Zadoff-Chu sequence, and “n” is index of each of constituent components of the sequence.
18. The system of claim 17 , wherein “N” is 63, the first index is 34, and the second index is 29.
19. The system of claim 15 , wherein the radio signal is a P-SCH (Primary-SCH) signal.
20. The system of claim 15 , wherein the predetermined index set further comprises a third index other than the first index and the second index.