Apparatus and method for transmission of sounding reference signal in uplink wireless communication systems with multiple antennas and sounding reference signal hopping
A sounding reference signal transmission method which is efficient in an uplink wireless telecommunications system using a multiple antenna technique and sounding reference signal hopping. A terminal using the multiple antenna technique is equipped with a plurality of antennas, and a base station receives the sounding reference signal transmitted from these antennas and estimates the uplink channel state of each antenna. Moreover, the sounding reference signal performs frequency hopping so that the base station determines the channel condition for the entire bandwidth to which data is transmitted in the uplink system. The sounding reference signal is transmitted through an antenna pattern in which the sounding reference signal can be transmitted through the entire data transmission bandwidth of the uplink system for each antenna of the terminal without additional overhead in this environment.
1. A method of Sounding Reference Signal (SRS) transmission in a terminal in a communications system using multiple antennas the method comprising:
generating an SRS to be transmitted to a base station in a transmission time of the SRS;
selecting an antenna used to transmit the SRS according to a antenna pattern 0110; and
transmitting the SRS through selected antenna according to the antenna pattern 0110, in each transmission time of the SRS,
wherein “0” of the antenna pattern 0110 is an index of a first antenna and “1” of the antenna pattern 0110 is an index of a second antenna.
2. The method of claim 1 , wherein each element of the antenna pattern 0110 is an antenna index to be used at each transmission time of the SRS.
3. The method of claim 1 , wherein the antenna pattern 0110 is applied, when the number of SRS bands is an even number.
4. The method of claim 1 , wherein the antenna pattern 0110 is applied for SRS transmission, when an SRS hopping is enabled.
5. The method of claim 1 , wherein the antenna pattern 0110 is repeated for next four transmission times of the SRS, when the number of SRS bands is not a multiple of 4.
6. The method of claim 1 , wherein the antenna pattern 0110 and an antenna pattern being a complementary form of the antenna pattern 0110 are alternatively repeated by four transmission times of the SRS, when the number of SRS bands is a multiple of 4.
7. The method of claim 1 , wherein the antenna pattern is a repetition of an antenna pattern 01 regardless of the number of SRS bands, when the number of SRS bands is an odd number.
8. The method of claim 1 , wherein an SRS transmit antenna is generated by
a
[
n
SRS
]
=
{
[
n
SRS
+
⌊
n
SRS
/
2
⌋
+
β
·
⌊
n
SRS
/
K
⌋
]
mod
2
when
K
is
even
n
SRS
mod
2
when
K
is
Odd
,
β
{
1
where
K
mod
4
=
0
0
otherwise
K
=
∏
b
′
=
b
hop
B
SRS
N
b
′
where, n SRS is the transmission time, a(n SRS ) is the SRS transmit antenna index, B_SRS is a level index for uplink data transmission bandwidth, b_hop is a parameter for determining a frequency domain in which SRS frequency hopping is available, and Nb′ is the number of an SRS BandWidth (BW) at a level b′.
9. A method of Sounding Reference Signal (SRS) reception in a base station in a communications system using multiple antennas the method comprising:
separating an SRS for a specific terminal in the SRS reception from a terminal; and
determining an antenna of the terminal which transmitted the received SRS by using an antenna pattern 0110,
wherein “0” of the antenna pattern 0110 is an index of a first antenna of the terminal and “1” of the antenna pattern 0110 is an index of a second antenna of the terminal.
10. The method of claim 9 , wherein each element of the antenna pattern 0110 is an antenna index to be used at each transmission time of the SRS.
11. The method of claim 9 , wherein the antenna pattern 0110 is applied, when the number of SRS bands is an even number.
12. The method of claim 9 , wherein the antenna pattern 0110 is applied for SRS transmission, when SRS hopping is enabled.
13. The method of claim 9 , wherein the antenna pattern 0110 is repeated for next four transmission times of the SRS, when the number of SRS bands is not a multiple of 4.
14. The method of claim 9 , wherein the antenna pattern 0110 and an antenna pattern being a complementary form of the antenna pattern 0110 are alternatively repeated by four transmission times of the SRS, when the number of SRS bands is a multiple of 4.
15. The method of claim 9 , wherein the antenna pattern is repetition of an antenna pattern 01 regardless of the number of SRS bands, when the number of SRS bands is an odd number.
16. The method of claim 9 , wherein an SRS transmit antenna index is generated by
a
[
n
SRS
]
=
{
[
n
SRS
+
⌊
n
SRS
/
2
⌋
+
β
·
⌊
n
SRS
/
K
⌋
]
mod
2
when
K
is
even
n
SRS
mod
2
when
K
is
Odd
,
β
{
1
where
K
mod
4
=
0
0
otherwise
K
=
∏
b
′
=
b
hop
B
SRS
N
b
′
where, n SRS is the transmission time, a(n SRS ) is the SRS transmit antenna index, B_SRS is a level index for uplink data transmission bandwidth, b_hop is a parameter for determining a frequency domain in which SRS frequency hopping is available, and Nb′ is the number of an SRS BandWidth (BW) at a level b′.
17. An apparatus for transmitting an Sounding Reference Signal (SRS) in communication system using multiple antennas, the apparatus comprising;
an SRS sequence generator for generating an SRS to be transmitted to a base station in a transmission time of the SRS;
an SRS transmit antenna selector selecting an antenna used to transmit the SRS according to an antenna pattern 0110, in each transmission time of the SRS; and
a transmitter for transmitting the SRS through the selected antenna according to the antenna pattern 0110, in each transmission time of the SRS,
wherein “0” of the antenna pattern 0110 is an index of a first antenna and “1” of the antenna pattern 0110 is an index of a second antenna.
18. The apparatus of claim 17 , wherein each element of the antenna pattern 0110 is an antenna index to be used at each transmission time of the SRS.
19. The apparatus of claim 17 , wherein the antenna pattern 0110 is applied, when the number of SRS bands is an even number.
20. The apparatus of claim 17 , wherein the antenna pattern 0110 is applied for SRS transmission, when SRS hopping is enabled.
21. The method of claim 17 , wherein the antenna pattern 0110 is repeated for next four transmission times of the SRS, when the number of SRS bands is not a multiple of 4.
22. The method of claim 17 , wherein the antenna pattern 0110 and an antenna pattern being a complementary form of the antenna pattern 0110 are alternatively repeated by four transmission times of the SRS, when the number of SRS bands is a multiple of 4.
23. The apparatus of claim 17 , wherein the antenna pattern is repetition of an antenna pattern 01 regardless of the number of SRS bands, when the number of SRS bands is an odd number.
24. The apparatus of claim 17 , wherein an SRS transmit antenna index is generated by
a
[
n
SRS
]
=
{
[
n
SRS
+
⌊
n
SRS
/
2
⌋
+
β
·
⌊
n
SRS
/
K
⌋
]
mod
2
when
K
is
even
n
SRS
mod
2
when
K
is
Odd
,
β
{
1
where
K
mod
4
=
0
0
otherwise
K
=
∏
b
′
=
b
hop
B
SRS
N
b
′
where, n SRS is the transmission time, a(n SRS ) is the SRS transmit antenna index, B_SRS is a level index for uplink data transmission bandwidth, b_hop is a parameter for determining a frequency domain in which SRS frequency hopping is available, and Nb′ is the number of an SRS BandWidth (BW) at a level b′.
25. An apparatus for receiving a Sounding Reference Signal (SRS) in a communications system using multiple antennas, the apparatus comprising:
a Fast Fourier Transform unit for Fast Fourier transforming an SRS transmitted from a terminal;
an SRS frequency separation unit for separating the SRS for a specific terminal transformed into a frequency domain;
an SRS code separation unit for separating the SRS code assigned to the specific terminal from a code domain; and
an SRS transmit antenna decision unit for determining an antenna of the terminal which transmitted the SRS by using an antenna pattern 0110,
wherein “0” of the antenna pattern 0110 is an index of a first antenna of the terminal and “1” of the antenna pattern 0110 is an index of a second antenna of the terminal.
26. The apparatus of claim 25 , wherein each element of the antenna pattern 0110 is an antenna index to be used at each transmission time of the SRS.
27. The apparatus of claim 25 , wherein the antenna pattern 0110 is applied, when the number of SRS bands is an even number.
28. The apparatus of claim 25 , wherein the antenna pattern 0110 is applied for SRS transmission, when SRS hopping is enabled.
29. The method of claim 25 , wherein the antenna pattern 0110 is repeated for next four transmission times of the SRS, when the number of SRS bands is not a multiple of 4.
30. The method of claim 25 , wherein the antenna pattern 0110 and an antenna pattern being a complementary form of the antenna pattern 0110 are alternatively repeated by four transmission times of the SRS, when the number of SRS bands is a multiple of 4.
31. The apparatus of claim 25 , wherein the antenna pattern is repetition of an antenna pattern 01 regardless of the number of SRS bands, when the number of SRS bands is an odd number.
32. The apparatus of claim 25 , wherein an SRS transmit antenna index is generated by
a
[
n
SRS
]
=
{
[
n
SRS
+
⌊
n
SRS
/
2
⌋
+
β
·
⌊
n
SRS
/
K
⌋
]
mod
2
when
K
is
even
n
SRS
mod
2
when
K
is
Odd
,
β
{
1
where
K
mod
4
=
0
0
otherwise
K
=
∏
b
′
=
b
hop
B
SRS
N
b
′
where, n SRS is the transmission, a(n SRS ) is the SRS transmit antenna index, B_SRS is a level index for uplink data transmission bandwidth, b_hop is a parameter for determining a frequency domain in which SRS frequency hopping is available, and Nb′ is the number of an SRS BandWidth (BW) at a level b′.