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Diversity reception device, diversity reception method, and digital television reception device

A technology of diversity reception and signal reception, which is applied in space transmit diversity, digital transmission system, diversity/multi-antenna system, etc., and can solve problems such as complicated and difficult operation and complex circuit structure

Inactive Publication Date: 2013-03-27
FUJITSU GENERAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the conventional technologies represented by the above-mentioned patent documents 1 to 3, since the calculation processing for calculating the SN ratio (or CN ratio) is complicated, there is a problem that both complicates the circuit configuration for performing the calculation processing and takes time for the calculation. The problem
In addition, it is impossible to remove the influence of delayed waves and ghosts due to multipath, and the influence of noise of a specific frequency mixed into the received wave, and obtain a good SN ratio (or CN ratio) for self-comparison difficulty

Method used

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  • Diversity reception device, diversity reception method, and digital television reception device
  • Diversity reception device, diversity reception method, and digital television reception device
  • Diversity reception device, diversity reception method, and digital television reception device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] First, the configuration of the diversity receiving apparatus according to the first embodiment will be described. figure 1 is a functional block diagram showing the configuration of the diversity receiving apparatus according to the first embodiment. As shown in the figure, the diversity receiving apparatus 10a according to Embodiment 1 includes, for example, a first branch 100a, a second branch 200a (not shown), and a third branch 300a (not shown) for diversity reception of OFDM modulated signals. shown), the four branches of the fourth branch 400a. In addition, since the configurations of the first branch 100a to the fourth branch 400a are the same, the first branch 100a will be described as a representative. In addition, the number of branches is not limited to four of the first branch 100a to the fourth branch 400a, and any number may be used as long as it is plural.

[0116] In the first branch 100a, the AD converter 102 converts the OFDM modulated signal receiv...

Embodiment 2

[0147] Next, the configuration of the diversity receiving apparatus according to the second embodiment will be described. Figure 5 is a functional block diagram showing the configuration of the diversity receiving apparatus according to the second embodiment. As shown in the figure, the diversity reception apparatus 10b according to the second embodiment, like the diversity reception apparatus 10a of the first embodiment, includes, for example, a first branch 100b, a second branch 200b, a third Four branches of the branch 300b and the fourth branch 400b. In addition, since the configurations of the first branch 100b to the fourth branch 400b are the same as those of the diversity receiving apparatus 10a of the first embodiment, the first branch 100b will be used as a representative for description. In addition, the number of branches is not limited to four of the first branch 100b to the fourth branch 400b, and any number may be used as long as it is plural.

[0148] Regard...

Embodiment 3

[0159] First, the configuration of the diversity receiving apparatus according to the third embodiment will be described. Figure 8 is a functional block diagram showing the configuration of the diversity receiving apparatus according to the third embodiment. As shown in the figure, the diversity receiving apparatus 10c according to the third embodiment includes, for example, a first branch 100c, a second branch 200c (not shown), and a third branch 300c (not shown) for diversity reception of OFDM modulated signals. shown), the four branches of the fourth branch 400c. In addition, since the configurations of the first branch 100c to the fourth branch 400c are the same, the first branch 100c will be described as a representative. Also, the slope of branch number and N is higher than that of other low-pass filters min The slope of the complementary straight line of (I) is large. Thus, if Figure 10-3 As shown, it can be estimated that the complex baseband signal cut off by th...

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Abstract

The diversity receiving device (10a) has four branches that include first to fourth branches (100a to 400a) to diversity-receive OFDM modulated signals. For example, in the first branch (100a), a complex baseband signal that is detected by an orthogonal demodulating unit (103) is input to both a phase-difference correcting unit (104) and an SN-ratio calculating unit (105); the SN-ratio calculating unit (105) calculates SN ratios using a first-order equation of an output of a symbol in the complex baseband signal; and a combining unit (500) creates an input signal depending on the SN ratios in such a manner that a demodulating unit 700 demodulates the input signal. With this configuration, in diversity receiving of OFDM modulated signals, preferable SN ratios (or CN ratios) are calculated, which enhances the quality of the receiving result.

Description

technical field [0001] The present invention relates to calculating the SN ratio of each received signal obtained by receiving OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) modulated signal by a plurality of branch diversity, and according to the SN ratio, weighted and synthesized from the received signal A diversity receiving device, a diversity receiving method and a digital television receiving device for performing demodulation processing on an input signal. Background technique [0002] In recent years, wireless communication methods such as mobile communication, terrestrial digital broadcasting, and wireless LAN communication have become popular. In order to prevent the exhaustion of the radio frequency band for transmission waves and effectively use it, a radio wave multiplexing method called OFDM is gradually being used. [0003] An OFDM symbol (symbol) transmitted by OFDM is composed of an "effective symbol" portion in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04B7/08
CPCH04L27/2647H04B7/08H04B7/0857H04L1/20
Inventor 珍田武志高山一男合原秀法西胁弘尚吉本卓己
Owner FUJITSU GENERAL LTD
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