Method for transmitting information in a mimo radio communication system and radio communication system

• US 7,496,147 B2
• Filed: 05/27/2003
• Issued: 02/24/2009
• Est. Priority Date: 05/27/2002
• Status: Expired due to Fees

• Current Assignee: Nokia Siemens Networks GmbH & Company KG (Nokia Corporation)
• Original Assignee: Nokia Siemens Networks GmbH & Company KG (Nokia Corporation)
• Inventors: Qiu, Wei, Jötten, Christoph Arnold, Baier, Paul-Walter, Meurer, Michael, Tröger, Hendrik
• Primary Examiner(s): Liu; Shuwang
• Assistant Examiner(s): Perez; James M
• Application Number:
  US10/516,207
• Publication Number:
  US 20050169396A1
• Time in Patent Office: 2,100 Days
• Field of Search: 375/267, 375/299, 375346-347, 375/349, 375219-220, 375259-260, 375295-296, 455/101, 455/130, 455/132
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0848 Joint weighting

Abstract

A method is provided for transmitting information in a radio communication system provided with at least one transmitting station (AP) and at least two receiver stations (MT). The transmitting station (AP) and the receiver stations (MT) are connected together via a radio communication interface. The transmitting stations (AP) includes a transmitting antenna with K<SB>B</SB>³1 antenna elements, whereby K<SB>B</SB>≧1, and the receiving stations (MT) respectively include a transmitting antenna with K<SB>M</SB> antenna elements, whereby K<SB>M</SB>≧1, and which communicate via a MIMO-transmission. The transmitting signals transmitted from the antenna elements of the transmitting antenna of the transmitting station (AP) are produced in a common process and are adapted in relation to the transmitting energy to be used during radiation. Receiving signals received by the antenna elements of the receiver antenna of the receiver stations (MT) are detected in a linear signal process.

Claims

1. A method of transmitting information in a radio communication system, the method comprising:

connecting a transmit station to at least two receiver stations via a radio communication interface;

including a transmit antenna with at least two antenna elements at the transmit station and including a transmit antenna with at least two antenna elements at each of the receiver stations, wherein the transmit station and the receiver stations communicate using MIMO transmission;

generating transmit signals for radiation from the antenna elements of the transmit antenna of the transmit station in a common process and matching the transmit signals with regards to a transmit energy to be used for radiation;

detecting received signals received by antenna elements of receive antennas of the receiver stations in a linear signal processing through demodulation, taking into account space and time transmission characteristics between the transmit station and the respective receiver stations, wherein a receiver station specific transmit signal corresponds to a Rayleigh quotient;

calculating individual transmit signals for the antenna elements of the transmit antenna of the transmit station before radiation using a modulator matrix;

generating a transmit signal vector using a linear modulation of a data vector to be transmitted with the modulator matrix;

processing the received signals, the processing including using a demodulation matrix for linear receive-side signal processing;

connecting the transmit station to the receiver stations using at least one radio channel having a channel matrix; and

including a system matrix in the modulator matrix specified by a product of the demodulator matrix and the channel matrix.

2. A radio communication system for transmitting information, comprising:

at least one transmit station including a transmit antenna with at least two antenna elements;

at least two receiver stations each including a transmit antenna with at least two antenna elements; and

a radio communication interface for connecting the at least one transmit station and the at least two receiver stations;

wherein the transmit station generates transmit signals which are radiated by the antenna elements of the transmit antenna of the transmit station in a common process and matches the transmit signals with regards to a transmit energy to be employed for radiation;

wherein each of the receiver stations detect receive signals received by antenna elements of receive antennas of the receiver stations in a linear signal processing through demodulation, taking into account space and time transmission characteristics between the transmit station and the respective receiver stations;

wherein a receiver station specific transmit signal corresponds to a Rayleigh quotient;

wherein individual transmit signals are calculated for the antenna elements of the transmit antenna of the transmit station before radiation using a modulator matrix;

wherein a transmit signal vector is generated using a linear modulation of a data vector to be transmitted with the modulator matrix;

wherein the received signals are processed using a demodulation matrix for linear receive-side signal processing;

wherein the transmit station and the receiver stations are connected using at least one radio channel having a channel matrix; and

wherein a system matrix is included in the modulator matrix as specified by a product of the demodulator matrix and the channel matrix.