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Wireless communication system and wireless communication method

A wireless communication system and antenna technology, applied in diversity/multi-antenna systems, space transmit diversity, etc., can solve the problems of reducing design freedom, large amount of computation, and complex algorithms

Inactive Publication Date: 2013-06-12
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is considered that the signal separation method of MIMO is limited to reduce the degree of freedom in design, and the algorithm for obtaining antenna weights becomes complicated (ie, the amount of calculation is large)

Method used

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  • Wireless communication system and wireless communication method
  • Wireless communication system and wireless communication method
  • Wireless communication system and wireless communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Figure 7 is a diagram showing the configuration of the transmitting device of the first embodiment. In addition, the basic structure of the sending device is referred to Figure 4 As described above, it includes input ports 11-1 to 11-M, multiplication circuits 12-1 to 12-M, addition circuits 13-1 to 13-4, transmitters 14-1 to 14-4, and antenna 15-1. ~15-4. That is, this transmission device can form M transmission beams using four antenna elements. In addition, the antennas 15 - 1 to 15 - 4 are not particularly limited, and are arranged, for example, at intervals from half the carrier wavelength to about the carrier wavelength.

[0107] The control channel decoding unit 31 decodes a reverse link control channel from a receiving device (for example, a mobile device). The control channel will be described in detail later, and the control channel includes information on the number of selected beams indicating the number of transmission beams to be used, and beam numbe...

Embodiment 2

[0142] In the communication system of the second embodiment, the correlation coefficient between beams measured in the receiving device and the reception quality information of each beam are directly fed back to the transmitting device using the reverse link. In addition, in the transmitting device, the number of selected beams (the number of MIMO multiplexing) and the number of beams are determined by comparing with a preset threshold.

[0143] Therefore, if Figure 10 As shown, the transmitting apparatus of the second embodiment has a beam selection unit 36 ​​that determines the MIMO multiplexing number and beam number based on the correlation coefficient between the respective transmission beams and the reception quality of each transmission beam. In addition, the function of the beam selection unit 36 ​​is basically the same as Figure 9 The beam selection section 43 shown is the same. In addition, the receiving device of the second embodiment such as Figure 11 A beam ...

Embodiment 3

[0146] Figure 12 is a diagram showing the configuration of the transmission device of the third embodiment. The transmission device of the third embodiment forms a reception beam having the same directivity as a transmission beam, thereby estimating the correlation coefficient between the transmission beams and the quality of each transmission beam. In addition, an antenna array composed of antennas 15 - 1 to 15 - 4 is used in common for transmission and reception.

[0147] Multiplication circuits 52 - 1 to 52 -M multiply signals received via corresponding receivers 51 - 1 to 51 -M by corresponding weight value groups 1 to M, respectively. Wherein, the weight groups 1-M are properly calibrated in advance so as to form receiving beams 1-M having the same directivity as transmitting beams 1-M. In addition, the configurations of the multiplying circuits 52 - 1 to 52 -M are basically the same as those of the multiplying circuits 12 - 1 to 12 -M.

[0148] The correlation / qualit...

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Abstract

The invention provides a wireless communication system and a wireless communication method. A plurality of antennas are used by the wireless communication system for carrying out spatial multiplexing transmission of a plurality of data streams from a transmitting device to a receiving device. The transmitting device comprises a transmitted wave beam forming unit and a transmitting unit, wherein the transmitted wave beam forming unit forms a plurality of transmitted wave beams by multiplying the plurality of antennas of the device by a set of transmitting weights; and the plurality of transmitted wave beams are used by the transmitting unit for transmitting different data streams. The receiving device comprises a received wave beam forming unit, a selecting unit and a separating unit, wherein the received wave beam forming unit forms a plurality of received wave beams by multiplying the plurality of antennas of the device by a set of receiving weights; the selecting unit selects more than two received wave beams from the plurality of received wave beams; and the separating unit separates the plurality of data streams by utilizing the receiving signals acquired by the more than two received wave beams selected by the selecting unit.

Description

[0001] The patent application for this invention is a branch of the invention patent application with the invention name "Wireless Communication System", the international application date is December 28, 2004, the international application number is "PCT / JP2004 / 019650", and the national application number is "200480044741.4". case application. technical field [0002] The present invention relates to a wireless communication system and a communication device used in the wireless communication system, in particular to a transmitting device and a receiving device for performing data transmission in a wireless communication system in a multiple-input multiple-output (MIMO: Multi-Input Multi-Output) transmission mode . Background technique [0003] In recent years, in wireless communication systems, spatial multiplexing transmission technology that increases transmission capacity in proportion to the number of transmission antennas by transmitting different data streams in para...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06H04B7/04
Inventor 关宏之
Owner FUJITSU LTD