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Wireless receiver and wireless reception method

a wireless reception and wireless receiver technology, applied in the direction of multi-antenna systems, diversity/multi-antenna systems, orthogonal multiplexes, etc., can solve the problems of significantly deteriorating error rate characteristics in the receiving side and deteriorating error rate in the receiving side, so as to improve the error rate characteristic and interference compensation

Inactive Publication Date: 2008-01-24
INVT SPE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] An object of the present invention is to improve an error rate characteristic in the receiving side even under the environment, in which an interference compensation error becomes larger in the receiving side, when different data are transmitted between a plurality of transmitting antennas and a plurality of receiving antennas respectively as in the MIMO communication.

Problems solved by technology

However, since there is an influence such as an inter-code interference due to a noise or a multipath in an actual apparatus, and / or since there is also a quantization error or the like in an actual circuitry, an interference compensation error is generated in the process of compensating for an interference signal component from the transmission signal, and there is a problem that error rate characteristic in the receiving side significantly deteriorates when this error is larger.
In addition, depending on the propagation environment, a value of a determinant |AD−BC| of the inverse matrix represented in FIG. 1B (equation 2) may be closer to zero, and since the conventional apparatus attempts to compensate for the interference signal component even in such situation, another problem occurs that an interference compensation error in the separated desired signal becomes greater, thereby significantly deteriorating the error rate in the receiving side.

Method used

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  • Wireless receiver and wireless reception method
  • Wireless receiver and wireless reception method
  • Wireless receiver and wireless reception method

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first embodiment

[0023]FIG. 2 is a block diagram, illustrating a configuration of a wireless receiver according to a first embodiment of the present invention.

[0024] A wireless receiver shown in FIG. 2 comprises receiving antennas 101, receiving sections 102, a propagation path compensation section 103, an interference compensation section 104, a controller section 105, a selecting section 106, a demodulating section 107 and a decoding section 108.

[0025] In FIG. 2, a receiving section 102-1 performs a predetermined wireless receiving processing such as a down-converting and the like over a signal that is received through a receiving antenna 101-1, and then output thereof to the propagation path compensation section 103 and the interference compensation section 104. Similarly, a receiving section 102-2 performs a predetermined wireless receiving processing such as a down-converting and the like over a signal that is received through a receiving antenna 101-2, and then output thereof to the propagat...

second embodiment

[0053]FIG. 7 is a block diagram, illustrating a configuration of a controller section of a wireless receiver according to the second embodiment of the present invention.

[0054] Here, this controller section 105a has a configuration similar to the controller section 105 shown in FIG. 2, and same numeral is referred to same element, and the description thereof is omitted. The present embodiment is characterized in that a controller section includes a threshold setting section 201.

[0055] The threshold setting section 201 is informed of a modulation level, a coding rate, a spreading factor, or a code multiplex number used for transmission signal, and sets a threshold used in the comparative judgement section 113 based on these values. For example, the QPSK modulation system has better error resistance as compared with 16QAM modulation system when the propagation path environment is deteriorated. When the QPSK is employed, by performing the propagation path compensation for the received...

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Abstract

A Multi-Input / Multi-Output (MIMO) receiver may include a plurality of receiving antennas that receive a plurality of radio signals and an estimation section that finds channel estimation values of the plurality of radio signals. A MIMO separation section separates, using a MIMO scheme, the plurality of radio signals in accordance with the channel estimation values, and a compensation section compensates for channel variations of the plurality of radio signals. A selection section selects one of the MIMO separation section and the compensation section.

Description

[0001] This application is a continuation of application Ser. No. 10 / 536,010 filed May 23, 2005, which is a 371 application of PCT / JP2003 / 015059 and which is based on Japanese Patent Application No. 2002-341741 filed on Nov. 26, 2002, all the disclosure of each of the above applications being incorporated by reference herein.TECHNICAL FIELD [0002] The present invention relates to a wireless receiver which receives data transmitted in parallel from a plurality of transmitting antennas with a plurality of receiving antennas, and a wireless reception method employed in such an apparatus. BACKGROUND ART [0003] In recent years, Multi-Input / Multi-Output (MIMO) communication has been drawing an attention as a technology for enabling a communication of massive data such as images. In the MIMO communication, different transmitted data (sub streams) are respectively transmitted from a plurality of antennas in a transmitter side, and a plurality of the transmitted data that are mixed in a prop...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04M1/00H04J11/00H04B1/707H04B1/7097H04B7/04H04B7/06H04B7/08H04J99/00
CPCH04B7/0871H04B7/0413
Inventor SUDO, HIROAKI
Owner INVT SPE LLC
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