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Radio transmitting and receiving system

A receiving system and antenna technology, applied in diversity/multi-antenna systems, radio transmission systems, antennas, etc., can solve the problems of antenna signal correlation reduction, beam gain reduction, directional beam narrowing, etc., to improve the overall characteristics of the system, Improvement of system characteristics, the effect of high-efficiency large amounts of data

Inactive Publication Date: 2003-12-10
NEC CORP
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AI Technical Summary

Problems solved by technology

[0022] As mentioned above, in the cell propagation environment where the difference between the angles of arrival of the paths is large, even if the number of antennas is increased to narrow the directional beam to be transmitted, the transmission efficiency cannot be improved
On the other hand, when the mobile station is close to the base station, the signal correlation between the antennas decreases
Therefore it is difficult to form the beam
Disadvantageously, the beam gain is also reduced

Method used

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  • Radio transmitting and receiving system
  • Radio transmitting and receiving system
  • Radio transmitting and receiving system

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Embodiment Construction

[0054] refer to Figure 8 An antenna transmitting and receiving system device according to a first embodiment of the present invention will be described.

[0055] In the antenna transmitting and receiving system according to this embodiment, each base station has a transmitter including N (N is an integer of 2 or more) antennas, and each mobile station has a receiving machine, the receiver includes M (M is an integer of 2 or more) antennas. The number N of base station antennas can be set to be larger than the number M of mobile station antennas. Usually, N is set to 6 to 8, and M is set to 2 to 4.

[0056] In each base station, the antennas are divided into multiple array antenna groups according to the cell transmission environment. Each array antenna group performs loose directional beam steering. Each array antenna group transmits data in parallel (multiple-input multiple-output transmission). Reception according to multiple-input multiple-output is performed on the r...

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Abstract

A transmitter of a base station includes a data serial-to-parallel converter, M modulators, M beam formers, and transmission antennas. The data serial-to-parallel converter converts transmission data into M sequences. Each modulator modulates the transmission data. Each beam former weights the modulation signal to form directional beams. The transmission antennas narrow the beams and transmit the modulation signals in parallel (MIMO transmission). In a mobile station, a receiver has reception antennas for receiving data transmitted in parallel and an MIMO demodulator for demodulating the data.

Description

technical field [0001] The present invention relates to an antenna transmitting and receiving system in a mobile communication system, and more particularly, the present invention relates to an antenna transmitting and receiving system capable of efficiently transmitting a large amount of data in each cell. Background technique [0002] This application claims priority from prior application JP2002-146814, the contents of which are hereby incorporated by reference. [0003] High-speed packet data traffic growth is expected in future mobile communication cellular systems, especially in the downlink. Therefore, these systems require the rapid development of wireless transmission methods that can transmit large amounts of data efficiently. For such development, the following methods are currently being studied. This method uses a multi-level modulation method to give high priority to users in a good transmission environment, thereby realizing high-speed data transmission. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H01Q1/24H01Q3/24H01Q3/26H01Q21/08H04B7/04H04B7/08H04B7/26H04W16/24H04W16/28H04W16/30H04W88/02
CPCH01Q1/246H01Q3/24H04B7/0697H01Q3/26H01Q21/08H04B7/0452
Inventor 吉田尚正
Owner NEC CORP
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