METHOD FOR REDUCING INTERFERENCE IN A RADIO COMMUNICATION SYSTEM

• US 20080125154A1
• Filed: 11/21/2007
• Published: 05/29/2008
• Est. Priority Date: 05/25/2005
• Status: Abandoned Application

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: CHEN, Haifeng, WEBER, Tobias, ZIRWAS, Wolfgang, JUNGNICKEL, Volker, POHL, Volker
• Application Number:
  US11/943,669
• Publication Number:
  US 20080125154A1
• Time in Patent Office: Days
• US Class Current: 455/501
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence

Abstract

According to the invention, a method for reducing interference in a radio communication system is proposed, wherein a user terminal is equipped with at least two antennas for receiving at least two signal streams using a space-time processing technique, wherein the at least two signal streams are received from at least two transmit antennas of at least two base stations, and wherein the at least two signal streams are distinguished by orthogonal sequences.

Claims

1. A method for reducing interference in a radio communication system, wherein

a user terminal is equipped with at least two antennas for receiving at least two signal streams using a space-time processing technique,

the at least two signal streams are received from at least two transmit antennas of at least two base stations, and

the at least two signal streams are distinguished by orthogonal sequences.

2. The method according to claim 1, wherein

the at least two base stations, transmitting said at least two signal streams, are synchronized.

3. The method according to claim 1, wherein

the orthogonal sequences are added to the signal streams.

4. The method according to claim 1, wherein

the spatial multiplexing is used for an intercell handover from a first of said at least two base stations to a second of said at least two base stations.

5. The method according to claim 1, wherein

the at least two signal streams are transmitted using the same at least one frequency band.

6. The method according to claim 1, wherein

the orthogonal sequences are used at least for channel estimation at the user terminal.

7. The method according to claim 1, wherein

the orthogonal sequences are pilot symbols.

8. A terminal of a radio communication system, comprising

at least two antennas, and

a receiver receiving at least two signal streams using spatial multiplexing, wherein the at least two signal streams are received from at least two transmit antennas of at least two base stations, and wherein the at least two signal streams are distinguished by orthogonal sequences.

9. A receiver for a terminal of a radio communication system, comprising a processor for processing of at least two signal streams received from at least two transmit antennas of at least two base stations, wherein the at least two signal streams are distinguished by orthogonal sequences.

10. The receiver according to claim 9, wherein

the processing is effected over a number of received symbols.