X-MIMO Systems with Multi-Transmitters and Multi-Receivers

• US 20130010840A1
• Filed: 09/15/2012
• Published: 01/10/2013
• Est. Priority Date: 09/25/2008
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: Maddah-Ali, Mohammad Ali, Jia, Ming, Ma, Jianglei, Zhu, Peiying, Tong, Wen, Motahari, Seyed Abolfazi, Khandani, Amir, Baligh, Mohammadhadi
• Granted Patent: US 8,488,728 B2
• Time in Patent Office: Days
• US Class Current: 375/211
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0232 by interpolation between sounding signals
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

A method and apparatus for transmitting and receiving a wireless transmission of a plurality of data streams in a wireless communication system having a plurality of nodes is disclosed. Each node has multiple antennas. The method involves receiving first and second data streams from respective first and second nodes at a receiver node, causing the receiver node to generate a receive filter for decoding each of the received data streams, and causing the receiver node to transmit receive filter information for each of the first and second data streams, the receive filter information facilitating precoding of the first and second data streams for simultaneous transmission within a common frequency band to the receiver node.

Claims

1. For use in a wireless communication system having a plurality of nodes, each node having multiple antennas, a relay station configured to:

receive first and second data streams from respective first and second nodes;

generate a receive filter for decoding each of said first and second data streams; and

transmit receive filter information for each of said first and second data streams, said receive filter information facilitating precoding of simultaneous transmissions within a common frequency band to said relay station.

2. The relay station of claim 1, wherein the receive filter comprises a minimum mean squared error filter.

3. The relay station of claim 1, wherein the receive filter comprises a zero forcing filter.

4. The relay station of claim 1, wherein the wireless communication system is a Long Term Evolution (LTE) system.

5. The relay station of claim 1, wherein the receive filter information for each of said first and second data streams is associated with a compound filter.

6. The relay station of claim 1, wherein the first and second data streams include pilot signals.

7. The relay station of claim 6, wherein each filter is generated based on the pilot signals.