Wireless communication system, and apparatus and method for wireless communication

• US 8,520,642 B2
• Filed: 04/29/2011
• Issued: 08/27/2013
• Est. Priority Date: 11/08/2006
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Mihota, Norihito
• Primary Examiner(s): NGUYEN, STEVEN H D
• Application Number:
  US13/097,965
• Publication Number:
  US 20110205883A1
• Time in Patent Office: 851 Days
• Field of Search: None
• US Class Current: 370/334
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0697 using spatial multiplexing

Abstract

An embodiment of the invention provides a wireless communication system for carrying out a spatial multiplexing communication between a transmitter, and a receiver, the system including: a channel information matrix acquiring section for acquiring a channel information matrix; a weighting factor matrix arithmetically operating section for obtaining a weighting factor matrix based on the channel information matrix thus acquired; a normalizing section for executing processing for normalizing the weighting factor matrix; a detecting section for detecting whether there is presence or absence of an abnormality in the processing; a weighting processing section for executing weighting processing based on the weighting factor matrix for each of transmission signals transmitted from the transmitter in accordance with a detection result obtained from the detecting section; and a transmitting section for transmitting the transmission signals for which the weighting processing section executes the weighting processing from the transmitter to the receiver.

Claims

1. A wireless communication system for carrying out a spatial multiplexing communication between a transmitter having a plurality of antennas, and a receiver having a plurality of antennas, the wireless communication system comprising:

channel information matrix acquiring means for acquiring a channel information matrix having transmission functions of the pairs of antennas between the sender side and the receiver side as elements;

weighting factor matrix arithmetically operating means for obtaining a weighting factor matrix based on the channel information matrix thus acquired;

weighting processing means for executing weighting processing based on the weighting factor matrix for transmission signals which are transmitted from the transmitter;

transmission signal normalizing means for executing processing for normalizing each of the transmission signals weighted by the weighting processing means so that each of electric powers of the transmission signals from the respective transmitting antennas becomes a specified value;

matrix product arithmetically operating means for multiplying each of the transmission signals which are transmitted from the transmitter by a predetermined matrix, thereby weighting each of the transmission signals;

detecting means for detecting whether there is presence or absence of an abnormality in the processing executed by the weighting processing means or the normalizing means; and

transmitting means for transmitting one of the transmitting signal for which the weighting processing means executes the weighting processing, and the transmission signal obtained by the matrix product arithmetically operating means from the transmitter to the receiver in accordance with the detection result obtained from the detecting means.

2. The wireless communication system according to claim 1, wherein the detecting means detects that an input signal beyond a predetermined limit is input to the transmission signal normalizing means, or that an overflow or an underflow occurs in a middle of the arithmetic operation for the normalization as abnormality.

3. The wireless communication system according to claim 1, wherein the matrix product arithmetically operating means previously prepares a weighting factor matrix having a row norm guaranteed therefore, and multiplies each of the transmission signals which are transmitted from the transmitter by the weighting factor matrix to weight each of the transmission signals.

4. The wireless communication system according to claim 3, wherein the matrix product arithmetically operating means previously prepares a unit matrix, a rotation matrix having a suitable angle, a mirror matrix, a Walsh-Hadamard matrix, or a matrix obtained by combining these two or more matrices with each other.

5. A wireless communication apparatus including a plurality of antennas for carrying out a spatial multiplexing communication with a receiver having a plurality of antennas, the wireless communication apparatus comprising:

weighting factor matrix arithmetically operating means for obtaining a weighting factor matrix based on a channel information matrix having transmission functions of the pairs of antennas between the sender side and the receiver side as elements;

weighting processing means for executing weighting processing, based on the weighting factor matrix, for transmission signals which are transmitted through the antennas, respectively;

transmission signal normalizing means for executing processing for normalizing each of the transmission signals weighted by the weighting processing means so that each of electric powers of the transmission signals from the respective transmitting antennas becomes a specified value;

matrix product arithmetically operating means for multiplying each of the transmission signals which are transmitted through the antennas, respectively, by a predetermined matrix, thereby weighting each of the transmission signals concerned;

detecting means for detecting whether there is presence or absence of an abnormality in the processing executed by the weighting processing means or the normalizing section; and

transmitting means for transmitting one of the transmitting signal for which the weighting processing means executes the weighting processing, and the transmission signal obtained by the matrix product arithmetically operating means from the transmitter to the receiver in accordance with the detection result obtained from the detecting means.

6. The wireless communication apparatus according to claim 5, wherein the detecting means detects that an input signal beyond a predetermined limit is input to the transmission signal normalizing means, or that an overflow or an underflow occurs in a middle of the arithmetic operation for the normalization as abnormality.

7. The wireless communication apparatus according to claim 5, wherein the matrix product arithmetically operating means previously prepares a weighting factor matrix having a row norm guaranteed therefore, and multiplies each of the transmission signals which are transmitted from the transmitter by the weighting factor matrix to weight each of the transmission signals.

8. The wireless communication apparatus according to claim 7, wherein the matrix product arithmetically operating means previously prepares a unit matrix, a rotation matrix having a suitable angle, a mirror matrix, a Walsh-Hadamard matrix, or a matrix obtained by combining these two or more matrices with each other.

9. A wireless communication method of carrying out a spatial multiplexing communication with a receiver having a plurality of antennas by using a plurality of antennas, the wireless communication method comprising the steps of:

arithmetically operating a weighting factor matrix based on a channel information matrix having transmission functions of the pairs of antennas between the sender side and the receiver side as elements;

executing weighting processing, based on the weighting factor matrix, for each of transmission signals which are transmitted through the antennas, respectively;

executing processing for normalizing each of the transmission signals weighted in the weighting processing so that each of electric powers of the transmission signals which are transmitted through the transmission antennas, respectively, becomes a specified value;

multiplexing each of the transmission signals which are transmitted through the antennas, respectively, by a predetermined matrix, thereby weighting each of the transmission signals;

detecting whether there is presence or absence of an abnormality in the processing executed in the weighting processing step or in the normalizing step; and

transmitting one of the transmission signal for which the weighting processing is executed in the weighting processing step, and the transmission signal obtained in the matrix product arithmetically operating step in accordance with a detection result obtained in the detecting step.

10. The wireless communication method according to claim 9, wherein in the detecting step, it is detected as an abnormality in the processing that an input signal beyond a predetermined limit is input to the transmission signal normalizing step, or that an overflow or an underflow occurs in a middle of the arithmetic operation for the normalization.

11. The wireless communication method according to claim 9, wherein in the matrix product arithmetically operating step, each of the transmission signals which are transmitted through the antennas, respectively, is weighted with a weighting factor matrix having a row norm guaranteed therefore.

12. The wireless communication method according to claim 11, wherein in the matrix product arithmetically operating step, a unit matrix, a rotation matrix having a suitable angle, a mirror matrix, a Walsh-Hadamard matrix, or a matrix obtained by combining these two or more matrices with each other is used.

13. A wireless communication system for carrying out a spatial multiplexing communication between a transmitter having a plurality of antennas, and a receiver having a plurality of antennas, the wireless communication system comprising:

a channel information matrix acquiring section configured to acquire a channel information matrix having transmission functions of the pairs of antennas between the sender side and the receiver side as elements;

a weighting factor matrix arithmetically operating section configured to obtain a weighting factor matrix based on the channel information matrix thus acquired;

a weighting processing section configured to execute weighting processing based on the weighting factor matrix for transmission signals which are transmitted from the transmitter;

a transmission signal normalizing section configured to execute processing for normalizing each of the transmission signals weighted by the weighting processing section so that each of electric powers of the transmission signals from the respective transmitting antennas becomes a specified value;

a matrix product arithmetically operating section configured to multiply each of the transmission signals which are transmitted from the transmitter by a predetermined matrix, thereby weighting each of the transmission signals;

a detecting section configured to detect whether there is presence or absence of an abnormality in the processing executed by the weighting processing section or the normalizing section; and

a transmitting section configured to transmit one of the transmitting signal for which the weighting processing section executes the weighting processing, and the transmission signal obtained by the matrix product arithmetically operating section from the transmitter to the receiver in accordance with the detection result obtained from the detecting section.

14. A wireless communication apparatus including a plurality of antennas for carrying out a spatial multiplexing communication with a receiver having a plurality of antennas, the wireless communication apparatus comprising:

a weighting factor matrix arithmetically operating section configured to obtain a weighting factor matrix based on a channel information matrix having transmission functions of the pairs of antennas between the sender side and the receiver side as elements;

a weighting processing section configured to execute weighting processing, based on the weighting factor matrix, for transmission signals which are transmitted through the antennas, respectively;

a transmission signal normalizing section configured to executing processing for normalizing each of the transmission signals weighted by the weighting processing section so that each of electric powers of the transmission signals from the respective transmitting antennas becomes a specified value;

a matrix product arithmetically operating section configured to multiply each of the transmission signals which are transmitted through the antennas, respectively, by a predetermined matrix, thereby weighting each of the transmission signals concerned;

a detecting section configured to detect whether there is presence or absence of an abnormality in the processing executed by the weighting processing section or the normalizing section; and

a transmitting section configured to transmit one of the transmitting signal for which the weighting processing section executes the weighting processing, and the transmission signal obtained by the matrix product arithmetically operating section from the transmitter to the receiver in accordance with the detection result obtained from the detecting section.