Unlock instant, AI-driven research and patent intelligence for your innovation.

Equalization device, receiving device and equalization method

A technology of equalization device and receiving device, which is applied to the shaping network in the transmitter/receiver, baseband system components, etc., can solve the problems of delay distribution estimation accuracy decline, and achieve the effect of suppressing the estimation accuracy decline

Inactive Publication Date: 2016-04-13
MITSUBISHI ELECTRIC CORP
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the technique disclosed in Patent Document 1, there is a problem that the estimation accuracy of the delay profile decreases in a receiving environment where the receiver moves relative to the transmitter.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Equalization device, receiving device and equalization method
  • Equalization device, receiving device and equalization method
  • Equalization device, receiving device and equalization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0033] figure 1 It is a functional block diagram schematically showing a configuration example of the receiving device 1 according to Embodiment 1 of the present invention. Such as figure 1 As shown, the receiving device 1 has a receiving antenna element Rx, a front end part 10, a PN removal part 11, an equalization part 12, a de-interleaver (de-interleaver) 15, a de-mapping (de-mapping) part 16 and an error correction part 17 .

[0034] The front end unit 10 receives radio signals via the receiving antenna element Rx. The front end unit 10 performs analog signal processing such as tuning processing on the wireless signal to generate a carrier frequency band signal, and then performs A / D conversion and quadrature demodulation on the carrier frequency band signal to generate and output the baseband reception signal (complex digital signal) Rs .

[0035] figure 2 (A) and (B) are diagrams schematically showing examples of a plurality of incoming waves (direct waves and de...

Embodiment approach 2

[0078] Next, Embodiment 2 of the present invention will be described. Figure 15 It is a functional block diagram schematically showing the configuration of the channel estimation unit 14B according to the second embodiment. The configuration of the reception device of this embodiment is the same as that of the reception device 1 of Embodiment 1 except for the channel estimation unit 14B.

[0079] and, if Figure 15 As shown, except for the variation detection unit 24B, the smoothing unit 26B, and the threshold setting unit 27B, the configuration of the transmission path estimation unit 14B of the present embodiment is the same as that of the transmission path estimation unit 14 of the first embodiment ( image 3 ) have the same structure.

[0080] Figure 16 It is a functional block diagram schematically showing the configuration of the variation detection unit 24B according to the second embodiment. Similar to the variation detection unit 24 in Embodiment 1, the variatio...

Embodiment approach 3

[0098] Next, Embodiment 3 of the present invention will be described. Figure 18 It is a functional block diagram schematically showing the configuration of the smoothing unit 26C in the third embodiment. Except for the smoothing unit 26C, the configuration of the channel estimation unit of the present embodiment is the same as that of the channel estimation unit 14B of the second embodiment ( Figure 15 ) have the same structure. Furthermore, the configuration of the receiving device of this embodiment is the same as that of the receiving device of Embodiment 2 except for the smoothing portion 26C.

[0099] Such as Figure 18 As shown, with the smoothing part 26 of Embodiment 1 ( Figure 10 ) Similarly, the smoothing unit 26C has a correlation holding unit 260 , a filtering unit 261 and a filtering control unit 265 . The smoothing unit 26C of this embodiment further has 1 ,...,S N respectively converted into the above maximum Doppler frequency Fd 1 ,...,Fd N The Doppl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides an equalizing device, a receiving device and an equalizing method. In an environment that a receiver moves, estimation precision reduction for delay distribution can be restrained. The equalizing device (12) is provided with the following components: a correlation calculating part (21) which acquires a correlation sequence between a known signal sequence and a received signal (Rs); an arrived wave detecting part (23) which detects the position of a plurality of correlation peak values that respectively correspond with a plurality of arrived waves according to the correlation sequence; a variation amount detecting part (24) which detects time variation of the plurality of correlation peak values; a smoothing part (26) which performs smoothing wave filtering on the correlation sequence in a code element direction for generating eliminated delay distribution; and an equalizing processing part (13) which corrects distortion of the received signal (Re) according to the eliminated delay distribution. The smoothing part (26) changes smoothing wave filtering characteristic according to time variation of the correlation peak values.

Description

technical field [0001] The present invention relates to an equalization technique for compensating the distortion received by a received signal from a transmission path, in particular to an equalization technique for compensating the distortion received by a received signal from a transmission path by using a known signal sequence. Background technique [0002] In wireless communication systems and terrestrial digital broadcasting systems, the receiver not only receives incoming waves (direct waves) directly from the transmitter, but also sometimes receives incoming waves that are reflected, diffracted or scattered by obstacles such as buildings after being transmitted from the transmitter. Incoming waves (not direct waves). The delay profile (delay profile) represents information on the delay times, amplitudes, and phases of such a plurality of incoming waves. Japanese Unexamined Patent Application Publication No. 2011-199391 (Patent Document 1) discloses a channel respons...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
Inventor 新保大介
Owner MITSUBISHI ELECTRIC CORP