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Wireless communication system, transmission device, and receiving device

A technology of a wireless communication system and a receiving device, which is applied in the direction of wireless communication, radio transmission system, diversity/multi-antenna system, etc., and can solve problems such as inability to use multiple antennas

Inactive Publication Date: 2012-02-01
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that it cannot be applied to the case where multiple antennas are used for transmission and reception.

Method used

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  • Wireless communication system, transmission device, and receiving device
  • Wireless communication system, transmission device, and receiving device
  • Wireless communication system, transmission device, and receiving device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0035] In this embodiment, a wireless communication system is described in which the number of transmitting antennas of the transmitting device is M and the number of spatial multiplexing is 1, and the number of receiving antennas of the receiving device is N and the number of spatial multiplexing is 1. When the number is 1, a multipath transmission countermeasure is implemented in the modulation unit and the demodulation unit.

[0036] figure 1 It is a diagram showing a configuration example of a radio communication system according to the present embodiment. It includes: a transmitting device equipped with M transmitting antennas, and a receiving device equipped with N receiving antennas. Next, each device will be specifically described.

[0037] figure 2 It is a figure which shows the structural example of a transmission apparatus. The transmission device includes a modulation unit 11, signal lines 12-1 to 12-M, delay units 13-2 to 13-M, gain imparting units 14-1 to 14...

Embodiment approach 2

[0054] In the present embodiment, different delay amounts from those in the first embodiment are given to the transmitting device and the receiving device. Portions different from Embodiment 1 will be described.

[0055] Figure 6 It is a figure which shows the structural example of a transmission apparatus. The transmission device includes a modulation unit 11, signal lines 12-1 to 12-M, delay units 41-2 to 41-M, gain imparting units 14-1 to 14-M, and transmission antennas 15-1 to 15-M. Delay units 41-2 to 41-M perform delay processing on transmission signals.

[0056] Figure 7 It is a figure which shows the structural example of a receiving apparatus. The receiving device includes receiving antennas 21 - 1 to 21 -N, gain imparting units 22 - 1 to 22 -N, delaying units 51 - 2 to 51 -N, adding unit 24 , and demodulating unit 25 . Delay sections 51-2 to 51-N perform delay processing on received signals.

[0057] In the transmission device, the signal lines 12-2 to 12-M i...

Embodiment approach 3

[0064] In this embodiment, a wireless communication system will be described in which the number of transmitting antennas of the transmitting device is LK, the number of outputs of the modulator is L, and the number of receiving antennas of the receiving device is PQ. , assuming that the number of inputs of the demodulation unit is P, MIMO (Multiple Input Multiple Output) spatial multiplexing transmission is performed in the modulation unit and the demodulation unit, and demodulation processing in the frequency domain is performed in the receiving device . Portions different from Embodiment 1 will be described.

[0065] Figure 9 It is a figure which shows the structural example of a transmission apparatus. The transmission device includes a modulation unit 61, signal lines 62-1 to 62-LK, delay units 63-2 to 63-K, 63-K+2 to 63-K+K, . . . , 63-(L-1) K+2 to 63-LK, gain imparting units 64-1 to 64-LK, and transmission antennas 65-1 to 65-LK. The modulation unit 61 generates a ...

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PUM

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Abstract

A wireless communication system configured by a transmission device comprising a plurality of transmission antennas, and a receiving device comprising a plurality of receiving antennas, wherein the transmission device is provided with a branching unit to branch signals into a plurality of transmission signals which pass through a plurality of signal paths corresponding to the plurality of transmission antennas, and delay units (13-2 to 13-M) arranged in at least one of the signal paths to add delay to the transmission signal, and when the transmission signal branched by the branching unit is added with delay by the delay units (13-2 to 13-M), the delay-added transmission signal is used as a transmission signal and transmitted to the receiving device through the plurality of transmission antennas; and the receiving device is provided with delay units (23-2 to 23-N) arranged in at least one of a plurality of signal paths for a plurality of received signals received by the plurality of receiving antennas to pass through, to add delay to the received signals, and an addition unit (24) to add each of the received signals.

Description

technical field [0001] The present invention relates to a wireless communication system using a plurality of antennas for signal transmission and reception. Background technique [0002] Conventionally, there is a technique of spatial diversity that reduces degradation of transmission characteristics caused by fading in wireless communication. The transmission device includes two antennas, and transmits the modulated wave delayed by one slot or more from the other antenna for transmitting the modulated wave. The receiving device performs multipath processing for enhancing and extracting a main wave component contained in a received wave. Thereby, it is possible to obtain a diversity effect based on space and frequency diversity (frequency diversity) without enlarging the frequency band. This technique is disclosed in Patent Document 1 below. [0003] Patent Document 1: Japanese Patent No. 2572765 Contents of the invention [0004] However, according to the above conven...

Claims

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Application Information

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IPC IPC(8): H04J99/00H04B7/02H04B7/06H04W88/02
CPCH04B7/0671H04B7/0894H04B7/0837
Inventor 西本浩山冈智也久保博嗣
Owner MITSUBISHI ELECTRIC CORP
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