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Transmitter, receiver, and communication method

A technology of sending device and receiving device, which is applied in multiplex communication, communication between multiple stations, space transmit diversity, etc., can solve the problem of signal quantity dependence, and achieve the effect of increasing data rate

Inactive Publication Date: 2008-07-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the SDM method described above, there is a problem that the number of signals that can be multiplexed on the transmission side depends on the number of transmission antennas, and multiplexing that exceeds the number of transmission antennas cannot be performed.

Method used

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  • Transmitter, receiver, and communication method
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  • Transmitter, receiver, and communication method

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Embodiment approach 1

[0043] In Embodiment 1 of the present invention, for the sake of illustration, it is assumed that a 2×2 MIMO system with two transmit antennas and two receive antennas is assumed. For this system, consider the pair x 1 、x 2 and x 3 Three transmit signals are multiplexed.

[0044] FIG. 2 is a block diagram showing a schematic configuration of a transmission and reception system according to Embodiment 1 of the present invention. In this figure, the transmission signal generation unit 101 at the transmission end converts one of the three signals x 2 with the remaining two signals x 1 and x 3 are synthesized separately to generate two synthesized signals x 1 +x 2 and x 2 +x 3 . Then, the generated composite signal is transmitted from the respective transmitting antennas 102 and 103 . In this transmission method, since x is transmitted from multiple antennas 2 , so it is possible to put x in the receiving end 2 effects cancel each other out. The transmitted two compos...

Embodiment approach 2

[0125] In Embodiment 1, the method of realizing the multiplexing of "the number of transmitting antennas + 1" is described. In Embodiment 2 of the present invention, the method of realizing the multiplexing of "the number of transmitting antennas + 2" is shown. For the convenience of description , assuming a 2×2 MIMO system with two transmitting antennas and two receiving antennas, for this system, consider x 1 , x 2 , x 3 , x 4 The four transmit signals are multiplexed.

[0126] FIG.13 is a block diagram showing the configuration of base station 190 according to Embodiment 2 of the present invention. The multiplex number control section 191 obtains the multiplex number control information transmitted from the mobile station, and controls the S / P conversion section 132 based on the obtained multiplex number control information. In order to make when the multiplexing number control information is 2, the transmission data is converted into two sequences of parallel data; whe...

Embodiment approach 3

[0177] In Embodiment 3 of the present invention, as in Embodiment 1, assuming a 2×2 MIMO system with two transmitting antennas and two receiving antennas, for the given system, consider the pair x 1 、x 2 and x 3 Three transmit signals are multiplexed.

[0178] FIG.20 is a block diagram showing the configuration of mobile station 220 according to Embodiment 3 of the present invention. In this figure, combined signal determining sections 221 and 222 determine signal points of the received combined signal output from signal separating section 157 based on the MCS information output from MCS selecting section 160 .

[0179] When the separation of the composite signal by signal separation section 157 is incomplete or the noise power is large, it may affect the detection accuracy in multiplexed signal detection section 161 . Therefore, by determining the signal point of the received composite signal and specifying the signal combination, the detection accuracy in the multiplexed ...

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Abstract

Disclosed are a transmitting device, a receiving device and a communication method capable of increasing a data rate in a MIMO system. One signal x2 among the three signals is combined with the remaining two signals x1 and x3 to generate two combined signals x1+x2 and x2+x3. Then, the generated composite signal is transmitted from each transmitting antenna (102, 103). The signal separation processing unit (106) at the receiving end separates the received signals r1 and r2 into two signals y1 and y2 through signal separation processing such as ZF. In the MLD processing unit (107), an MLD evaluation formula is generated using y1 and y2, and MLD processing is performed. At this time, x2 is mutually canceled from y1 and y2 to generate evaluation expressions for x1 and x3, and maximum likelihood estimation is performed. As a result of MLD processing, x1 and x3 are detected, respectively. Furthermore, in the elimination processing unit (108), x2 is detected by performing elimination processing on the detected x1 and x3 from y1 and y2.

Description

technical field [0001] The present invention relates to a transmitting device, a receiving device, and a communication method used in a wireless communication system using MIMO (Multiple Input Multiple Output) technology for wireless communication by receiving wireless signals transmitted from a plurality of antenna units by a plurality of antenna units. Background technique [0002] In recent years, in wireless communication systems typified by mobile phones and the like, service forms have diversified, and transmission of not only voice data but also large-capacity data such as still images and moving images has been required. In response to this, research on a MIMO system that achieves high frequency utilization efficiency is being carried out extensively. [0003] As a technique for increasing the transmission rate in the MIMO system, there is an SDM (Space Division Multiplexing: Space Division Multiplexing) method (see, for example, Non-Patent Document 1). The SDM meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J15/00H04B7/06H04B7/26H04J99/00
CPCH04B7/0413H04B7/0613H04B7/0837
Inventor 今井友裕汤田泰明星野正幸木村良平
Owner PANASONIC CORP