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Diversity receiver and receiving method

A receiving method and receiver technology, which are applied in the directions of space transmit diversity, diversity/multi-antenna system, modulated carrier system, etc., can solve the problems of increased receiver processing capacity, carrier extraction and detection times, etc.

Inactive Publication Date: 2005-08-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, in the above-mentioned conventional diversity receiver, when diversity combining after detection is used in multi-carrier transmission, a plurality of carriers are extracted for each branch, detected, and then synthesized, so that the number of carrier extraction and detection increases. Big
That is, there is a problem that as the number of branches for performing diversity increases, the amount of processing in the receiver increases.
[0021] In addition, there is a problem that, in diversity combining before detection of multi-carrier modulation, when a signal is transmitted from a mobile station to a base station in mobile communication, since the characteristics of the transmission path vary with the sending station, it is impossible to perform the maximum ratio. synthesis

Method used

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  • Diversity receiver and receiving method

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Experimental program
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Embodiment approach 1

[0040] FIG. 1 is a diagram showing the configuration of Embodiment 1 of a diversity receiver according to the present invention. In this embodiment, it is assumed that two carrier signals are received by two branches. In FIG. 1, 1 and 2 are branch combiners for each carrier, 3 is a multicarrier demodulator, 4 and 5 are decision units, and 6 and 7 are weighting calculators for calculating weighting coefficients for combining received signals. In addition, 11 and 12 represent received signals, 13 and 14 represent branch combined outputs, 15 and 16 represent carrier detection results, 17 and 18 represent judgment results of received signals, and 19 and 20 represent weighting coefficients for combining received signals.

[0041] figure 2 21 is a drawing showing a transmission path model assumed in Embodiment 1, 21 is a base station receiving a multi-carrier signal, and 22 and 23 are mobile stations. 24 and 25 denote transmission signals from the mobile stations 22 and 23 to the...

Embodiment approach 2

[0050] Figure 5 It is a drawing showing the configuration of Embodiment 2 of the diversity receiver according to the present invention. This embodiment assumes a case where two branch receptions are performed on two carrier signals, similarly to the above. Figure 5 Among them, 13a represents branch synthesis output. In addition, the same code|symbol is attached|subjected to the structure similar to Embodiment 1 mentioned above, and description is abbreviate|omitted. Here, only the operation (receiving method) different from that of the first embodiment will be described.

[0051] Figure 6 26 and 27 represent transmission signals from the base station 21 to the mobile stations 22 and 23 . In this embodiment, it is assumed that the transmission channel characteristics are substantially the same in each carrier, and it is assumed that there is no frequency selective fading, such as "downlink in multi-carrier transmission".

[0052] In the weight calculator 6 , the optimal...

Embodiment approach 3

[0056] Figure 7 28 and 29 represent transmission signals from the mobile stations 22 and 23 to the base station 21 . In this embodiment, it is assumed that a plurality of received carriers have substantially the same transmission path characteristics, and the plurality of carriers are divided into several groups. As an example, when two mobile stations 22 and 23 each transmit two carrier signals, the transmission signals of each mobile station arrive at the base station with approximately the same transmission path characteristics. In this case, diversity combining can be performed on multi-carrier signals transmitted from the same mobile station at one time.

[0057] Here, the operation (reception method) of the diversity receiver of this embodiment will be described. Here, only operations that are different from Embodiments 1 and 2 will be described. For example, in the weight calculator of the present embodiment, carriers having the same transmission channel characteris...

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Abstract

The diversity receiver according to the present invention operates as a multicarrier diversity receiver. The diversity receiver includes weight calculators that calculate a weight coefficient for each carrier based on information about a phase difference between branches and amplitude information on each carrier obtained from a reception frame, and branch combiners that combine reception signals at branches for each carrier based on the weight coefficient prior to signal detection.

Description

technical field [0001] The present invention relates to a multi-carrier diversity receiver and a receiving method thereof, in particular to a diversity receiver and a receiving method thereof used in digital wireless communication equipment such as digital mobile communication, digital satellite communication and digital mobile satellite communication. Background technique [0002] The conventional diversity receiver will be described below. In digital mobile communications, radio waves may be reflected, diffracted, and scattered by terrain and objects around the mobile station, causing a drastic change in the amplitude and phase of the received signal. As one of techniques aimed at improving characteristics in a fading environment, there is known a diversity reception technique in which signals are received by a plurality of branches and combined or selected. Here, as a conventional example, the configuration and operation of a differential detection diversity receiver tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04L27/26
CPCH04B7/0848H04L27/2647
Inventor 武田政弘
Owner MITSUBISHI ELECTRIC CORP