| US 7,555,035 B2 | ||
| Communication system and method using a relay node | ||
| Hui Shi, Yokosuka (Japan); Tetsushi Abe, Yokohama (Japan); Takahiro Asai, Yokosuka (Japan); and Hitoshi Yoshino, Yokosuka (Japan) | ||
| Assigned to NTT DoCoMo, Inc., Tokyo (Japan) | ||
| Filed on Aug. 30, 2005, as Appl. No. 11/213,883. | ||
| Claims priority of application No. 2004-252879 (JP), filed on Aug. 31, 2004; application No. 2004-306171 (JP), filed on Oct. 20, 2004; and application No. 2005-248824 (JP), filed on Aug. 30, 2005. | ||
| Prior Publication US 2006/0050655 A1, Mar. 09, 2006 | ||
| Int. Cl. H04L 25/52 (2006.01); H04B 7/14 (2006.01) | ||
| U.S. Cl. 375—211 [370/315] | 15 Claims |
| 1. A wireless communication system for delivering a transmission signal from a source node via a plurality of relay nodes
toward a destination node,
wherein each of the relay nodes comprises:
a QR decomposition unit configured to perform QR decomposition on a first channel matrix between the source node and the relay
node and/or a second channel matrix between the relay node and the destination node;
a transformation matrix calculation unit configured to calculate one or more transformation matrices based on the QR of at
least one of the first and second channel matrices;
a relaying signal generator configured to generate a relaying signal by multiplying a received signal by a prescribed signal
comprised of at least one of the transformation matrices; and
a transmission unit configured to transmit the relaying signal to the destination node; and
wherein the destination node receives the relaying signal as a received signal and detects a desired signal from the received
signal.
|