Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus

a radio transmitter and control method technology, applied in power management, multiplex communication, signalling characterisation, etc., can solve the problems of unintroduced solution measures and the quality of reception signals rapidly degrade, and achieve the effects of enhancing transmission efficiency, smooth separation, and enhancing transmission efficiency

Inactive Publication Date: 2009-08-06
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0023]According to a radio transmission control method of the present invention, a radio receiver apparatus selects a transmission signal to be used based on a pilot signal from a radio transmitter apparatus and notifies the radio transmitter apparatus of the transmission signal, and the radio transmitter apparatus sends an information signal to the radio receiver apparatus based on the transmission signal to be used. Therefore, the radio receiver apparatus can receive an information signal that can be separated smoothly, and a transmission efficiency can be enhanced.
[0024]Furthermore, a radio receiver apparatus of the present invention detects transmission-related information corresponding to a pilot signal sent from a radio transmitter apparatus, selects a transmission signal to be used based on the detected information, and notifies the radio transmitter apparatus of the selected transmission signal. Therefore, an information signal that can be separated smoothly in accordance with a propagation environment, the number of transmission / reception antennas, and the like, can be received, and a transmission efficiency can be enhanced.
[0025]Furthermore, a radio transmitter apparatus of the present invention sends a pilot signal from a plurality of antennas, receives a transmission signal to be used, which is selected by a receiver based on transmission-related information corresponding to the pilot signal, and sends an information signal with the transmission signal to be used. Therefore, on the radio receiver apparatus side, an information signal that can be separated smoothly in accordance with a propagation environment, the number of transmission / reception antennas, and the like, can be received, and a transmission efficiency can be enhanced.

Problems solved by technology

Therefore, the quality of a reception signal degrades rapidly.
However, such solution measures have not been introduced as yet.

Method used

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  • Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus
  • Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus
  • Radio transmission control method, radio receiver apparatus, and radio transmitter apparatus

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embodiment 1

[0060]This embodiment relates to an efficient signal transmission method and communication system in a MIMO system in which a plurality of signals are subjected to space division multiplexing (SDM) transmission. In the following description, a transmitting side of an information signal will be referred to as a terminal A, and a receiving side thereof will be referred to as a terminal B.

[0061]FIG. 1 is a most basic transmission / reception structural view showing this embodiment. FIG. 2 is a flowchart showing a control procedure of this embodiment. FIG. 3 shows how the terminal B notifies the terminal A of a control signal (control information).

[0062]FIG. 4 shows how the terminal A transmits an information signal to the terminal B. In FIG. 5, (a) represents a pilot signal sent from the terminal A, and (b) represents a control signal transmitted from the terminal B to the terminal A. FIG. 6 shows a configuration of a pilot signal detecting part at the terminal B. Hereinafter, this embod...

embodiment 2

[0074]This embodiment relates to an efficient transmission control method and communication system for a MIMO system in which a plurality of signals are subjected to space division multiplexing (SDM) transmission. In particular, this embodiment shows one specific method regarding a method of selecting a transmission signal for the terminal B in Embodiment 1.

[0075]FIG. 7 shows a transmission signal determining part 10 in this embodiment. FIG. 8 is a flowchart showing a control procedure in the transmission signal determining part 10. Hereinafter, a method of selecting a transmission signal in this embodiment will be described with reference to FIGS. 7 and 8.

[0076]As shown in FIG. 7, the transmission signal determining part 10 selects R signals having power as large as possible from among a plurality of transmission signals. Specifically, when received a propagation vector hn from the pilot signal detecting part 9, the transmission signal determining part 10 of the terminal B selects ...

embodiment 3

[0079]This embodiment relates to an efficient transmission control method and communication system for a MIMO system in which a plurality of signals are subjected to space division multiplexing (SDM) transmission. In particular, this embodiment relates to one method regarding a method of selecting a transmission signal at the terminal B in Embodiment 1, which is different from that of Embodiment 2.

[0080]FIG. 9 shows a transmission signal determining part 10 in this embodiment, and FIG. 10 is a flowchart showing a control procedure in the transmission signal determining part 10. Hereinafter, a method of selecting a transmission signal in this embodiment will be described with reference to FIGS. 9 and 10.

[0081]As shown in FIG. 9, the transmission signal determining part 10 selects R signals from among a plurality of transmission signals such that the spatial correlation becomes as small as possible. Herein, the spatial correlation refers to a parameter defined by

|hn1Hhn2| / (∥hn1∥∥hn2∥)...

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Abstract

Conventionally, if the number of transmission antennas is greater than that of reception antennas, different signals simultaneously transmitted from the transmission antennas cannot be separated from one another at the receiving end, resulting in a significant degradation of received-signal quality. A transmitter and a receiver each have a plurality of antennas. The transmitter transmits a pilot signal. The receiver receives the pilot signal, calculates transmission-related information corresponding to the pilot signal, selects, based on this calculated information, a transmission signal to be used by the transmitter, and notifies the transmitter of the selected signal. The transmitter selects, from the informed transmission signal, transmission antennas and uses the selected antennas to transmit information signals, so that a signal separation can be easily performed at the receiving end.

Description

[0001]This application is a divisional of pending U.S. application Ser. No. 10 / 567,339, filed Nov. 30, 2006, which is herein incorporated by reference, which is the National Stage application of PCT International Application No. PCT / JP04 / 10845 filed Jul. 29, 2004, which claims priority to Japanese Patent Application No. 2003-286184, filed Aug. 4, 2003.TECHNICAL FIELD[0002]The present invention relates to a radio transmission control method for a MIMO system in which a radio receiver apparatus and a radio transmitter apparatus respectively use a plurality of antennas to perform SDM transmission, and a radio receiver apparatus and a radio transmitter apparatus.BACKGROUND ART[0003]Recently, radio communications has come into widespread use remarkably owing to its convenience. As a result, there is an urgent demand for taking measures to deal with the shortage of use frequencies. As one of the techniques of using the use frequency effectively, there is a MIMO (Multiple-Input Multiple-Ou...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04L27/28H04J99/00H04B7/06H04B7/26H04J1/02
CPCH04B7/061H04B7/0639H04B7/0684H04W52/42H04B7/0695H04L1/0001H04L1/0025H04B7/0691H04B7/0421H04B7/0619H04B7/0697H04B7/0857H04B7/0689
InventorHARA, YOSHITAKATAIRA, AKINORIOTSUKI, TOMOAKISUTO, KENJI
OwnerMITSUBISHI ELECTRIC CORP