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Wireless communication system and transmission device

a transmission device and wireless communication technology, applied in wireless communication, multiplex communication, electronic wave modulation, etc., can solve the problems of not having a coexistence of the above methods and the huge throughput of the mimo communication system for data detection

Inactive Publication Date: 2009-12-31
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables seamless switching of transmission methods according to the receiving device's configuration, enhancing data detection efficiency and throughput by accounting for both the number of antennas and transmission path characteristics.

Problems solved by technology

Thus, the MIMO communication system requires an enormous throughput for the data detection.
In this case, there is none of a method of making the above methods coexistent with each other.

Method used

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  • Wireless communication system and transmission device
  • Wireless communication system and transmission device
  • Wireless communication system and transmission device

Examples

Experimental program
Comparison scheme
Effect test

operational example

Estimation of Transmission Characteristic Information by Transmission Characteristic Estimating Unit 232

[0096]The transmission characteristic estimating unit 232 estimates the transmission characteristic information from the received signals. This transmission characteristic information is estimated by the following method as elements of the transmission characteristic matrix F expressed by the formula (1.4) and comprising of the transmission path matrix H reflecting the transmission path environment and the change-of-variable matrix G multiplied by the transmitter 11.

[0097]The transmission characteristic estimating unit 232 estimates the transmission characteristic information by use of the transmission characteristic estimation signals as the known signals given from the transmitter 11. To be specific, the transmission characteristic estimating unit 232 estimates the matrix elements f33, f34, f43, and f44 shown in the formula (1.4).

[0098]The transmission characteristic estimation ...

modified example 1

[0123]In the MIMO communication system in the embodiment, the transmitter executes the signal processing based on the configuration of the receiver, however, the transmission path matrix H as the transmission path information is employed on the occasion of effecting the signal processing.

[0124]Namely, the transmitter side knows the transmission path information, and hence the signal processing may be executed to perform the high-speed data transmission on the transmission path exhibiting a high quality of the transmission path, and to perform the low-speed data transmission on the low-quality transmission path (which corresponds to a transmission rate control unit according to the present invention).

[0125]With this contrivance, the high-speed data transmission can be performed as a whole of the system.

modified example 2

[0126]Further, the higher-speed data transmission may additionally be conducted on the high-quality transmission path by increasing the electric power for transmission, and the lower-speed data transmission may be effected on the low-quality transmission path by decreasing the electric power for transmission. With this contrivance, the higher-speed data transmission can be done as a total system because of getting approximate to the power control based on Water Filling Principal. In this case, for example, when constructed of the simple receiver as in the aforementioned (first configuration), the transmitter may execute processing as below.

[0127]The transmitter at first effects weighting in a way that multiplies the change-of-variable matrix G given in the formula (1.8) with respect to the transmission path matrix H by a weighting coefficient wi so that an electric power weight Pi with respect to a diagonal section ai of the matrix A shown in the formula (1.9) meets the formula (1.1...

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Abstract

The present invention relates to a wireless communication system to properly switch over a transmission method of radio signals corresponding to a configuration of a receiver. The wireless communication system according to the present invention includes a transmitting device having a plurality of antennas and capable of transmitting radio signals different from each other from these antennas, and a receiving device having at least one antenna and receiving the radio signals transmitted from the transmitting device. The receiving device comprises an information transmitting unit transmitting, to the transmitting device, configuration information about a configuration of the receiving device, and the transmitting device includes a transmitting unit transmitting the radio signals by a transmission method corresponding to the configuration information received from the receiving device.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 128,285, filed on May 13, 2005, now pending, the entire disclosures of which are incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]1. Field of the Present Invention[0003]The invention relates to a wireless communication system including a transmitting device having a plurality of antennas and capable of transmitting different radio signals from the respective antennas, and to the transmitting device.[0004]2. Description of the Related Art[0005]MIMO (Multi Input and Multi Output) communication system is given as a communication system capable of improving a transmission rate (transmission capacity) as a total by transmitting different pieces of data by use of same frequency band (and further the same spread code) from a plurality of antennas in parallel. The MIMO communication system is that plural pieces of data are transmitted from a plurality of tra...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B7/02H04J99/00H04W16/28H04W28/00H04W28/18H04W92/10
CPCH04B7/0452H04B7/0628H04B7/0626
Inventor SHIMIZU, MASAHIKOITO, AKIRA
Owner FUJITSU LTD