METHOD OF TRANSMITTING REFERENCE SIGNALS IN A WIRELESS COMMUNICATION HAVING MULTIPLE ANTENNAS

• US 20130230123A1
• Filed: 04/05/2013
• Published: 09/05/2013
• Est. Priority Date: 09/26/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Noh, Yu Jin, Lee, Dae Won, Kim, Bong Hoe, Kim, Ki Jun
• Granted Patent: US 9,385,906 B2
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/0248 Eigen-space methods
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided

Abstract

A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end.

Claims

1. A method of transmitting signals using orthogonal subcarriers by an apparatus in a wireless communication system, the method comprising:

generating two or more demodulation reference signals (DMRSs) for two or more data layers; and

mapping the two or more DMRSs to resource elements (REs) on a subframe, wherein the subframe consists of two slots and each slot consists of six or seven symbols,

wherein the two or more DMRSs are mapped to a same set of REs by code division multiplexing, the two or more DMRSs mapped on two symbols per slot,

wherein the same set of REs includes REs separated by N subcarriers per slot, and

wherein N is an integer equal to or greater than 2.

2. The method of claim 1, wherein the two or more DMRSs are precoded.

3. The method of claim 1, wherein the two or more DMRSs are staggered within the subframe or slot.

4. The method of claim 1, wherein N is equal to 2, 3 or 4.

5. The method of claim 1, wherein one of two or more multiple access schemes is selectively used among depending on a rank, wherein the two or more multiple access schemes include an Orthogonal Frequency Division Multiple Access (OFDMA) and a Single Carrier Frequency Division Multiple Access (SC-FDMA).

6. The method of claim 1, wherein the two or more DMRSs are cyclic-shifted in a frequency domain or a time domain.

7. An apparatus used for transmitting signals using orthogonal subcarriers in a wireless communication system, the apparatus comprising:

a transmitting unit; and

a processor, wherein the processor is adapted to generate two or more demodulation reference signals (DMRSs) for two or more data layers, and to map the two or more DMRSs to resource elements (REs) on a subframe, wherein the subframe consists of two slots and each slot consists of six or seven symbols,

wherein the two or more DMRSs are mapped to a same set of REs by code division multiplexing, the two or more DMRSs mapped on two symbols per slot,

wherein the same set of REs includes REs separated by N subcarriers per slot, and

wherein N is an integer equal to or greater than 2.

8. The apparatus of claim 7, wherein the two or more DMRSs are precoded.

9. The apparatus of claim 7, wherein the two or more DMRSs are staggered within the subframe or slot.

10. The apparatus of claim 7, wherein N is equal to 2, 3 or 4.

11. The apparatus of claim 7, wherein one of two or more multiple access schemes is selectively used among depending on a rank, wherein the two or more multiple access schemes include an Orthogonal Frequency Division Multiple Access (OFDMA) and a Single Carrier Frequency Division Multiple Access (SC-FDMA).

12. The apparatus of claim 7, wherein the two or more DMRSs are cyclic-shifted in a frequency domain or a time domain.