Method and system for synchronization in communication system
A method can be used for facilitating an uplink synchronization between a first transceiver and a second transceiver within a cell in a multi-user cellular communication system. The first transceiver receives a reference from the second transceiver and generates a set of signature sequences based on the reference. The first transceiver selects a first signature sequence from the set of signature sequences and incorporates the first signature sequence into a signal. The first transceiver transmits the signal to the second transceiver. The signal is used for a uplink synchronization between the first transceiver and the second transceiver. The set of signature sequences are generated from sequences with zero-correlation zone.
1. A method for facilitating an uplink synchronization between a first transceiver and a second transceiver within a cell in a multi-user cellular communication system, the method comprising:
receiving, by the first transceiver, a reference from the second transceiver;
generating, by the first transceiver, a set of signature sequences based on the reference;
selecting, by the first transceiver, a first signature sequence from the set of signature sequences;
incorporating, by the first transceiver, the first signature sequence into a signal; and
transmitting, by the first transceiver, the signal to the second transceiver, wherein the signal is used for a uplink synchronization between the first transceiver and the second transceiver, the set of signature sequences being generated from sequences with zero-correlation zone, and the sequences with zero-correlation zone being obtained from a Zadoff-Chu sequence, the Zadoff-Chu sequence being:
a
(
k
)
=
{
W
N
k
2
/
2
+
qk
,
N
even
W
N
k
(
k
+
1
)
/
2
+
qk
,
N
odd
,
k
=
0
,
1
,
…
,
N
-
1
,
where
W
N
=
exp
(
-
j
2
π
r
/
N
)
,
where r, q and N are integers and r is relatively prime to N.
2. The method of claim 1 , wherein each of the sequences with zero-correlation zone is obtained by modulating the Zadoff-Chu sequence with an orthogonal modulation sequence.
3. The method of claim 1 , wherein the reference received from the second transceiver is designated for the parameter r.
4. The method of claim 1 , further comprising incorporating a cyclic prefix into the signal.
5. The method of claim 1 , wherein the first signature sequence is used in a preamble portion of the signal and the signal is transmitted over a random access channel.
6. The method of claim 1 , further comprising receiving a command from the second transceiver, wherein the command corresponds to a time of arrival of the signal from the first transceiver to the second transceiver and the command is used for adjusting a transmission timing of the first transceiver.
7. The method of claim 2 , wherein the orthogonal modulation sequence is a Hadamard sequence originated from a Hadamard matrix Hm of order m, the Hadamard matrix consists of only 1 and/or −1, and the Hadamard matrix has the property HmHmT=mI, where I is the identity matrix, m is an integer and T denotes transpose.
8. An apparatus operable to communicate in a wireless communications system, the apparatus comprising a processor coupled to a memory, wherein the processor is programmed to operate in the wireless communication system by:
receiving a reference from a transceiver;
generating a set of signature sequences based on the reference;
selecting a first signature sequence from the set of signature sequences;
incorporating the first signature sequence into a signal; and
transmitting the signal to the transceiver, wherein the signal is used for a uplink synchronization between the apparatus and the transceiver, the set of signature sequences being generated from sequences with zero-correlation zone, and the sequences with zero-correlation zone being obtained from a Zadoff-Chu sequence, the Zadoff-Chu sequence being:
a
(
k
)
=
{
W
N
k
2
/
2
+
qk
,
N
even
W
N
k
(
k
+
1
)
/
2
+
qk
,
N
odd
,
k
=
0
,
1
,
…
,
N
-
1
,
where
W
N
=
exp
(
-
j
2
π
r
/
N
)
,
where r, q and N are integers and r is relatively prime to N.
9. The apparatus of claim 8 , wherein each of the sequences with zero-correlation zone is obtained by modulating the Zadoff-Chu sequence with an orthogonal modulation sequence.
10. The apparatus of claim 8 , wherein the reference received from the transceiver is designated for the parameter r.
11. The apparatus of claim 8 , wherein the processor is further programmed to incorporate a cyclic prefix into the signal.
12. The apparatus of claim 8 , wherein the first signature sequence is used in a preamble portion of the signal, and the signal is transmitted over a random access channel.
13. The apparatus of claim 8 , wherein the processor is further programmed to receive a command from the transceiver, wherein the command corresponds to a time of arrival of the signal from the apparatus to the transceiver and wherein the command is used for adjusting a transmission timing of the apparatus.
14. The apparatus of claim 9 , wherein the orthogonal modulation sequence is a Hadamard sequence originated from a Hadamard matrix H m of order m, the Hadamard matrix consisting of only 1 and/or −1, and the Hadamard matrix having the property H m H m T =mI, where I is the identity matrix, m is an integer and T denotes transpose.
15. A wireless communication system, comprising:
a first transceiver; and
a second transceiver,
wherein the first transceiver comprises a processor coupled to a memory, wherein the processor is programmed to:
receive a reference from the second transceiver;
generate a set of signature sequences based on the reference;
select a first signature sequence from the set of signature sequences;
incorporate the first signature sequence into a signal; and
transmit the signal to the second transceiver, wherein the signal is used for a uplink synchronization between the first transceiver and the second transceiver, the set of signature sequences being generated from sequences with zero-correlation zone, and the sequences with zero-correlation zone being obtained from a Zadoff-Chu sequence, the Zadoff-Chu sequence being:
a
(
k
)
=
{
W
N
k
2
/
2
+
qk
,
N
even
W
N
k
(
k
+
1
)
/
2
+
qk
,
N
odd
,
k
=
0
,
1
,
…
,
N
-
1
,
where
W
N
=
exp
(
-
j
2
π
r
/
N
)
,
where r, q and N are integers and r is relatively prime to N.
16. The wireless communication system of claim 15 , wherein each of the sequences with zero-correlation zone is obtained by modulating the Zadoff-Chu sequence with an orthogonal modulation sequence.
17. The wireless communication system of claim 15 , wherein the reference received from the second transceiver is designated for the parameter r.
18. The wireless communication system of claim 15 , wherein the first signature sequence is used in a preamble portion of the signal, and the signal is transmitted over a random access channel.
19. The wireless communication system of claim 15 , wherein the processor is further programmed to receive a command from the second transceiver, the command corresponding to a time of arrival of the signal from the first transceiver to the second transceiver, and the command being used for adjusting a transmission timing of the first transceiver.
20. The wireless communication system of claim 16 , wherein the orthogonal modulation sequence is a Hadamard sequence originated from a Hadamard matrix H m of order m, the Hadamard matrix consists of only 1 and/or −1, and the Hadamard matrix has the property H m H m T =mI, where I is the identity matrix, m is an integer and T denotes transpose.