APPARATUS AND METHOD FOR TRANSMITTING A REFERENCE SIGNAL IN A RADIO COMMUNICATION SYSTEM

• US 20110281536A1
• Filed: 01/29/2010
• Published: 11/17/2011
• Est. Priority Date: 01/30/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Ihm, Bin Chul, Lee, Moon Il, Chung, Jae Hoon
• Granted Patent: US 8,463,210 B2
• Time in Patent Office: Days
• US Class Current: 455/129
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0684 using different training sequences per antenna

Abstract

An apparatus and a method for transmitting a reference signal in a radio communication system are provided. The apparatus comprises: N antennas; and a processor which is connected to the N antennas and which generates K (wherein K<N) reference signal sequence vectors based on K reference signal sequences and K virtual antenna vectors, and which transmits the K reference signal sequence vectors via the N antennas.

Claims

1. An apparatus for transmitting a reference signal, comprising:

N antennas; and

a processor operatively coupled with the N antennas and configured to;

generate K reference signal sequence vectors based on K reference signal sequences and K virtual antenna vectors, where K<

N; and

transmit the K reference signal sequence vectors through the N antennas.

2. The apparatus of claim 1, wherein the K reference signal sequence vectors are transmitted during a first period and the processor is configured to:

generate N-K reference signal sequence vectors based on N-K reference signal sequences and N-K virtual antenna vectors; and

transmit the N-K reference signal sequence vectors through the N antennas during a second period.

3. The apparatus of claim 2, wherein the K virtual antenna vectors and the N-K virtual antenna vectors are different column vectors selected from a virtual antenna matrix having N×

N size.

4. The apparatus of claim 3, wherein a reference signal patterns for at least one reference signal sequence of the K reference signal sequences is same as a reference signal pattern for at least one reference signal sequence of the N-K reference signal sequences, and the reference signal pattern is a time-frequency resource pattern used to transmit a reference signal sequence.

5. The apparatus of claim 3, wherein each virtual antenna matrix is a unitary matrix.

6. The apparatus of claim 1, wherein the processor is configured to receive virtual antenna channel information from a user equipment.

7. The apparatus of claim 3, wherein the processor is configured to receive physical antenna channel information from a user equipment, and the physical antenna channel information is estimated based on virtual antenna channel and the virtual antenna matrix.

8. The apparatus of claim 1, wherein the K reference signal sequence vectors are transmitted in a first frequency domain, and the processor is configured to:

generate N-K reference signal sequence vectors based on N-K reference signal sequences and the N-K virtual antenna vectors; and

transmit the N-K reference signal sequence vectors through the N antennas in a second frequency domain.

9. A method for transmitting a reference signal in a wireless communication system, comprising:

generating K reference signal sequence vectors based on K reference signal sequences and K virtual antenna vectors, where K<

N; and

transmitting the K reference signal sequence vectors through N antennas.

10. The method of claim 9, wherein the K reference signal sequence vectors are transmitted during a first period and further comprising:

generating N-K reference signal sequence vectors based on N-K reference signal sequences and N-K virtual antenna vectors; and

transmitting the N-K reference signal sequence vectors through the N antennas during a second period.