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Transmission passage responding detector

A technology of transmission path and predictor, which is applied in the direction of transmission system, electrical components, baseband system components, etc., can solve the problem of large circuit scale and achieve the effect of improving the prediction accuracy

Inactive Publication Date: 2010-02-10
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that when the PN sequence is long or the delay time due to multipath is long, the circuit scale becomes very large because FFT and IFFT with a large number of points are required.

Method used

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no. 1 approach

[0034] First, refer to figure 1 , the configuration of the channel response estimator according to the first embodiment of the present invention will be described. figure 1 It is a schematic block diagram illustrating the configuration of the channel response estimator according to the first embodiment of the present invention.

[0035] Such as figure 1 As shown, the transmission path response estimator of the first embodiment of the present invention includes: a correlator 1, which calculates the complex time correlation between a received signal and a reference signal; a delay profile estimator 2, which records the calculated delay time for each The delay distribution h(τ) is calculated by the correlation value; the mirror image path identifier 3 as the identification part recognizes the time position of the mirror image path as the false correlation peak according to the delay distribution h(τ); the mirror image copy as the pseudo copy generation part generates A device 4...

no. 2 approach

[0094] Next, refer to Figure 7 , the configuration of the channel response estimator according to the second embodiment of the present invention will be described. Figure 7 It is a schematic block diagram illustrating the configuration of the transmission path response estimator according to the second embodiment of the present invention.

[0095] In the first embodiment, an image path is detected by making a delay profile from a received signal and a reference signal. On the other hand, the present embodiment differs in that two types of delay profiles are created using two different types of reference signals a and b for the received signal, and the difference between them is used to detect the image path.

[0096] Similar to the first embodiment, the reference signal a is composed of the entire unique word including the code loop part (preamble code 101, PN sequence head area 102a, PN sequence end area 102c, and post code 103). Since the code length is long, the estimat...

no. 3 approach

[0115] Next, refer to Figure 11 , the configuration of the channel response estimator according to the third embodiment of the present invention will be described. Figure 11 It is a schematic block diagram showing the configuration of the channel response estimator according to the third embodiment of the present invention.

[0116] In the first embodiment, the mirror path is removed by generating a copy with respect to the path at the delay time at which the delayed path is detected, and subtracting the copy from the delay profile. On the other hand, in the present embodiment, by identifying the position (delay time) of the mirror path with respect to the path at the delay time of the detected delay path, and replacing the arrangement of the time with zero, the mirror path is removed. One point is different.

[0117] In an environment where the delay spread is small, there is no true delay path with high power at the position of the delay instant where the image path is g...

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Abstract

The invention provides a transmission passage responding detector which can increase the detecting precision of transmission passage. The transmission passage responding detector is used in a receiverof a wireless system in which is periodically inserted signals with continuously or interruptedly arranged frames having a known mode structure formed by expanding a specific code sequence. The transmission passage responding detector comprises a correlator (1) for calculating the time correlation of the received signal and the known mode, a delay distribution detector (2) for recording the timecorrelation according to time sequence to generate a delay distribution of the received signal containing more than one delay wave, an image route identifier (3) for identifying a time position of a fake delay wave in the identified delay distribution, an image copy generator (4) for forming a fake copy aiming at the fake delay wave in the delay distribution, and a subtractor (5) for subtracting the fake copy from the delay distribution.

Description

technical field [0001] The present invention relates to a channel response estimator, and more particularly to a channel response estimator used in a receiver of a wireless system having a frame structure in which a specific known pattern obtained by cyclically extending a code sequence is periodically inserted. Background technique [0002] In general, in a wireless communication / broadcasting system, when a wireless signal transmitted from a transmitting station / broadcasting station reaches a receiver, it is reflected, scattered, or diffracted by terrain, features, etc., and these multiple radio waves are combined with each other. , and sometimes the signal waveform is distorted. This phenomenon is generally called multipath. In addition, when this multipath occurs, the path through which the transmission signal passes is called a multipath transmission path. [0003] Therefore, in the receiver, processing (equalization processing) is performed to extract the original wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B1/707H04B1/7107H04B1/7113
Inventor 松冈秀浩相泽雅己三木淳古川达久
Owner KK TOSHIBA
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