CN2884711Y

CN2884711Y - Device of controlling coefficient updating in multi-pass preventing system

Info

Publication number: CN2884711Y
Application number: CN 200520047704
Authority: CN
Inventors: 竺海安; 刘才勇; 顾大为; 侯钢; 王国中
Original assignee: Central Academy of SVA Group Co Ltd
Current assignee: Central Academy of SVA Group Co Ltd
Priority date: 2005-12-20
Filing date: 2005-12-20
Publication date: 2007-03-28
Anticipated expiration: 2015-12-20

Abstract

A device in anti-multipath system that controls coefficient updating, comprises a related arithmetic device, peak value judger and sub-peak value logistic module that are respectively connected with the related arithmetic device, threshold value comparator and comparison result judging memory that are in turn connected to the threshold value of the sub-peak value logistic module; the said sub-peak value logistic module comprises super-threshold counter, length counter that is connected to the super-threshold counter, comparator and delayer that are in turn connected to the super-threshold counter; the said utility model provides a device in anti-multipath system that controls coefficient updating, which can effectively control the coefficient updating frequency equilibrating filter, reduce the power consumption of equilibrating filter, in particular when the variation of multipath is insignificant, the same provides a testing method for feed-type anti-multipath for anti-multipath system.

Description

The device that control coefrficient upgrades in the anti-multipath system

Technical field

The utility model relates to the device that control coefrficient upgrades in a kind of anti-multipath system.

Background technology

At digital anti-multipath system receiving terminal, there is an equalization filter to come the signal that receives is carried out equalization filtering, so that the multipath signal minimum of output.Generally speaking, the equalization filter tap coefficient is in the situation of continual renovation always, to adapt to the multi-path environment of continuous variation, but change under the little situation at multi-path environment, as shown in Figure 1, each coefficient of equalizing wave filter that generates all can be more or less the same, and the filter effect of equalization filter can not have greatly improved, and each update coefficients all can increase the power consumption of DSP (Digital Signal Processing) and the power consumption of equalization filter.Along with renewal frequency uprises gradually, this meaningless power consumption can significantly increase.But from actual environment, the situation of some multipath can be come equalization filtering by adopting same tap coefficient, so, can reduce the renewal frequency of equalization filtering coefficient, reduces power consumption.Therefore, need to increase the device of control equalization filtering coefficient update.

The utility model content

The device that control coefrficient upgrades in a kind of anti-multipath system that the utility model provides, on time domain, adopt one section special sequence-ghost image to eliminate the characteristic that reference signal characterizes channel, through behind the equalization filtering, comprising this section special sequence-ghost image eliminates behind the equalization filtering of reference signal signal and is carrying out related operation eliminating reference signal with ghost image, obtain a Serial No. that contains peak information, effect to equalization filtering is estimated, and, judge whether equalization filter is upgraded according to the effect assessment result.

In order to achieve the above object, the utility model provides the device that control coefrficient upgrades in a kind of anti-multipath system, it comprises the related operation device, peak value determining device that is connected with the related operation device and minor peaks statistical module, and the threshold value comparator and the comparative result judgement memory that connect the minor peaks statistical module successively respectively;

Described minor peaks statistical module comprises the superthreshold counter, connects the length counter of superthreshold counter, and the comparator and the delayer that connect the superthreshold counter successively;

Data after the matched filtering of described related operation device input uniform filter output, the related operation device carries out related operation together to these data and ghost image elimination reference signal, obtain the related operation result, operation result is outputed to peak value determining device and minor peaks statistical module;

Described peak value determining device join dependency arithmetic unit and minor peaks statistical module, this peak value determining device adopts the mode that preestablishes peak threshold (being used for judging the minimum numerical value of peak value), related operation result to the output of related operation device surveys, when the related operation result is higher than the peak threshold of setting, produce the peak value index signal, this peak value index signal is outputed to the minor peaks statistical module;

The peak value index signal of the length counter input peak value determining device output in the described minor peaks statistical module, output superthreshold counter enable signals is to the superthreshold counter; Described length counter produces the superthreshold counter enable signals of each several number certificate about peak value, makes the superthreshold counter only add up each several number certificate about peak value; When the peak signal of a clock pulse arrived, the length counter zero clearing also began counting, when length counter is added to figure place entirely for " 1 ", stops counting; Length counter value produces a high level superthreshold counter enable signals during less than predetermined value; During greater than predetermined value, produce a low level superthreshold counter enable signals;

Described delayer is delayed time to the related operation result of input minor peaks statistical module, provides the time to produce the peak value index signal to give the peak value determining device, and will delay time several number according to after the related operation result output to comparator;

Described comparator also adopts the mode that preestablishes minor peaks threshold value (being used for judging the minimum numerical value of minor peaks), related operation result after the time-delay of delayer output is surveyed, when the related operation result is higher than the minor peaks threshold value of setting, producing the minor peaks signal is high level, when the related operation result is lower than the minor peaks threshold value of setting, producing the minor peaks signal is low level, at last the minor peaks index signal is outputed to the superthreshold counter;

But described superthreshold counter is a forward-backward counter, input input superthreshold counter enable signals, peak signal and the minor peaks signal of this superthreshold counter, the work of superthreshold counter enable signals control superthreshold counter, when the superthreshold counter enable signals is high level, the superthreshold counter carries out adding reducing, when the superthreshold counter enabled to low level, the superthreshold counter kept initial value constant; After the superthreshold counter is started working, at first the superthreshold counter is carried out zero clearing, when the minor peaks signal is high level by peak signal, the superthreshold counter adds " 1 ", when the minor peaks signal was low level, the superthreshold counter subtracted " 1 ", and Counter Value is outputed to the threshold value comparator;

Described threshold value comparator compares the data and the predetermined threshold of the output of minor peaks statistical module, when the data of minor peaks statistical module output during greater than predetermined threshold, comparative result is a high level, when the data of minor peaks statistical module output during less than predetermined threshold, comparative result is a low level, comparative result is outputed to comparative result judge in the memory;

Described comparative result is judged the comparative result and the comparative result sampled signal of the input input threshold value comparator output of memory, under the effect of this comparative result sampled signal, the comparative result of threshold value comparator output is sampled and preserved, if comparative result is a high level, export balanced rate ripple device coefficient update enable signal to equalization filtering coefficient generation module, if comparative result is low, exports balanced rate ripple device coefficient and do not upgrade enable signal to equalization filtering coefficient generation module.

The device that control coefrficient upgrades in a kind of anti-multipath system that the utility model provides, can effectively control the coefficient of equalizing wave filter renewal frequency, reduce the power consumption of equalization filter, particularly, provide the measuring means of a reaction type anti-multipath effect in particular for the anti-multipath system for changing little situation at multipath.

Description of drawings

Fig. 1 is the structural representation of the device that control coefrficient upgrades in a kind of anti-multipath system that does not use in the background technology that the utility model provides;

Fig. 2 is in the anti-multipath system, the structural representation of the device that control coefrficient upgrades in a kind of anti-multipath system that uses that the utility model provides;

Fig. 3 is the structural representation of the device that control coefrficient upgrades in a kind of anti-multipath system that provides of the utility model;

Fig. 4 is the structural representation of the minor peaks statistical module of the device that control coefrficient upgrades in a kind of anti-multipath system that provides of the utility model.

Embodiment

Followingly specify a kind of preferred forms of the present utility model according to Fig. 2～Fig. 4:

As Fig. 2, shown in Figure 3, the utility model provides the device that control coefrficient upgrades in a kind of anti-multipath system, it comprises related operation device 101, peak value determining device 102 that is connected with related operation device 101 and minor peaks statistical module 103, and the threshold value comparator 104 and the comparative result judgement memory 105 that connect minor peaks statistical module 103 successively respectively;

As shown in Figure 4, described minor peaks statistical module 103 comprises superthreshold counter 1034, connects the length counter 1031 of superthreshold counter 1034, and the comparator 1033 and the delayer 1032 that connect superthreshold counter 1034 successively;

Data after the matched filtering of described related operation device 101 input uniform filters 11 outputs, 101 pairs of these data of related operation device and ghost image are eliminated reference signal and are carried out related operation together, obtain the related operation result, operation result is outputed to peak value determining device 102 and minor peaks statistical module 103;

Described peak value determining device 102 join dependency arithmetic units 101 and minor peaks statistical module 103, this peak value determining device 102 adopts the mode that preestablishes peak threshold (being used for judging the minimum numerical value of peak value), related operation result to 101 outputs of related operation device surveys, when the related operation result is higher than the peak threshold of setting, produce the peak value index signal, this peak value index signal is outputed to minor peaks statistical module 103;

The peak value index signal of length counter 1031 input peak value determining devices 102 outputs in the described minor peaks statistical module 103, output superthreshold counter enable signals is to superthreshold counter 1034; Described length counter 1031 produces the superthreshold counter enable signals of each 1024 data about peak value, makes each 1024 data about 1034 statistics of superthreshold counter peak value; When the peak signal of a clock pulse arrived, length counter 1031 zero clearings also began counting, length counter 1031 be added to 13 full during for " 1 ", promptly be added at 4095 o'clock, stop counting; Length counter value produces a high level superthreshold counter enable signals during less than predetermined value 2048; During greater than predetermined value 2048, produce a low level superthreshold counter enable signals;

The related operation result of 1032 pairs of inputs of described delayer minor peaks statistical module 103 delays time, and provide the time to produce the peak value index signal to give peak value determining device 102, and the related operation result after 1024 data of will delaying time outputs to comparator 1033;

Described comparator 1033 also adopts the mode that preestablishes minor peaks threshold value (being used for judging the minimum numerical value of minor peaks), related operation result after the time-delay of delayer 1032 outputs is surveyed, when the related operation result is higher than the minor peaks threshold value of setting, producing the minor peaks signal is high level, when the related operation result is lower than the minor peaks threshold value of setting, producing the minor peaks signal is low level, at last the minor peaks index signal is outputed to superthreshold counter 1034;

But described superthreshold counter 1034 is forward-backward counters, input input superthreshold counter enable signals, peak signal and the minor peaks signal of this superthreshold counter 1034, the work of superthreshold counter enable signals control superthreshold counter 1034, when the superthreshold counter enable signals is high level, superthreshold counter 1034 carries out adding reducing, when the superthreshold counter enabled to low level, superthreshold counter 1034 kept initial value constant; After superthreshold counter 1034 is started working, at first superthreshold counter 1034 is carried out zero clearing, when the minor peaks signal is high level by peak signal, superthreshold counter 1034 adds " 1 ", when the minor peaks signal was low level, superthreshold counter 1034 subtracted " 1 ", the output counter value;

Described threshold value comparator 104 compares the data and the predetermined threshold of 103 outputs of minor peaks statistical module, when the data of minor peaks statistical module output during greater than predetermined threshold, comparative result is a high level, when the data of minor peaks statistical module output during less than predetermined threshold, comparative result is a low level, comparative result is outputed to comparative result judge in the memory 105;

Described comparative result is judged the comparative result and the comparative result sampled signal of input input threshold value comparator 104 outputs of memory 105, under the effect of this comparative result sampled signal, the comparative result of threshold value comparator 104 output is sampled and preserved, if comparative result is a high level, export balanced rate ripple device coefficient update enable signal to equalization filtering coefficient generation module 12, if comparative result is low, exports balanced rate ripple device coefficient and do not upgrade enable signal to equalization filtering coefficient generation module 12.

Claims

1. the device that control coefrficient upgrades in the anti-multipath system, it is characterized in that, comprise related operation device (101), peak value determining device (102) that is connected with related operation device (101) and minor peaks statistical module (103), and the threshold value comparator (104) and the comparative result judgement memory (105) that connect minor peaks statistical module (103) successively respectively;

Described peak value determining device (102) join dependency arithmetic unit (101) and minor peaks statistical module (103);

Described minor peaks statistical module (103) comprises superthreshold counter (1034), connects the length counter (1031) of superthreshold counter (1034), and the comparator (1033) and the delayer (1032) that connect superthreshold counter (1034) successively.