CN107809401A - A kind of demodulated signal symbol decision method based on dynamic threshold judgement - Google Patents
A kind of demodulated signal symbol decision method based on dynamic threshold judgement Download PDFInfo
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- CN107809401A CN107809401A CN201711013321.5A CN201711013321A CN107809401A CN 107809401 A CN107809401 A CN 107809401A CN 201711013321 A CN201711013321 A CN 201711013321A CN 107809401 A CN107809401 A CN 107809401A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03312—Arrangements specific to the provision of output signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/005—Reducing noise, e.g. humm, from the supply
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a kind of demodulated signal symbol decision method based on dynamic threshold judgement, noise is shielded by Configuration Online primary power threshold value, and decision threshold is set according to the change dynamic of signal energy, valid data can not be judged when preventing signal energy from reducing.This method can rapidly adapt to the system of a variety of different-energy signals on the basis of hardware is not changed, and simple and flexible, avoid design iterations, make the hardware module of design have reusability.
Description
Technical field
The present invention relates to a kind of demodulated signal symbol decision method, particularly a kind of demodulation letter based on dynamic threshold judgement
Number member decision method.
Background technology
With the fast development of Digital Signal Processing, Digital Modulation Techniques also obtained it is corresponding development and
Using, modulation /demodulation is important part in full digital wireless communication, and the output of base band data is determined by modulating performance,
And signal can correctly recover relevant with demodulation performance.In order to adapt to high speed data transfer business, for modulation-demodulation technique
Research be always each national scientific research technology emphasis, how noise and useful signal are made a distinction and are appropriately determined effectively
Data are the keys of modulation.In digital world, binary signal is exactly 0 and 1, represents high and low two amount of logic, ensures to adjust
Correct 0 and 1 can be exported after system very high requirement is proposed to demodulated signal symbol decision method.Existing traditional technology
The identification of signal is typically improved by the way of signal power is increased, although so also can correctly carry out symbol judgement,
But causing power output larger, power utilization is not high.
The content of the invention
Present invention aims at provide it is a kind of based on dynamic threshold judgement demodulated signal symbol decision method, with solve with
When into system, signal energy fluctuation is bigger the problem of demodulated signal symbol decision error.
A kind of demodulated signal symbol decision method based on dynamic threshold judgement concretely comprises the following steps：
The symbol decision-making system based on dynamic threshold judgement is built first, including：Energy computation module, DSP or CPU, door
Limit selection control module, symbol determination module.
Energy computation module is used to carry out the data signal after demodulation the computing that takes absolute value, and the size of absolute value just represents
The size of signal energy, the energy value of signal after being demodulated, give the energy value to thresholding selection control module and symbol is sentenced
Cover half block carries out computing.
DSP or CPU selects thresholding the initial energy threshold of control module Configuration Online, and primary power threshold value is used
To shield noise, when there is data-signal, this value can be changed dynamically；
The energy value of signal and DSP or CPU match somebody with somebody after the demodulation that thresholding selection control module calculates according to energy computation module
The primary power threshold value put dynamically carries out energy threshold control, obtains dynamic energy threshold；
The energy value of signal and dynamic energy threshold after the demodulation that symbol determination module calculates energy computation module
It is compared the symbol value that computing output judges.
Preferably, after the energy computation module calculates demodulation after the energy value of signal, after it postpones some cycles
Energy value when being less than the half of currency, the 1/4 of currency is taken as new energy threshold, if its delay some cycle
The half of energy value afterwards is more than currency, then using 1/4 of the energy value after postponing some cycles as new energy threshold.
Preferably, after the demodulation that the symbol determination module is calculated according to energy computation module the energy value of data signal with
Dynamic energy threshold is compared computing, and when the energy value is more than dynamic energy threshold, and the data signal is
On the occasion of when, symbol is determined as 10；When the energy value is more than dynamic energy threshold, and the data signal is negative value, code
Member is determined as 01；When the energy value is less than dynamic energy threshold, symbol is determined as 00.
This method shields noise by Configuration Online primary power threshold value, and is set according to the change dynamic of signal energy
Determine decision threshold, valid data can not be judged when preventing signal energy from reducing, ensure signal energy in configuration primary power thresholding
Also the judgement of signal element can be correctly carried out when under value.
Brief description of the drawings
A kind of demodulated signal symbol decision method flow charts based on dynamic threshold judgement of Fig. 1.
Embodiment
A kind of demodulated signal symbol decision method based on dynamic threshold judgement concretely comprises the following steps：
The first step builds the symbol decision-making system based on dynamic threshold judgement
Symbol decision-making system based on dynamic threshold judgement includes：Energy computation module, DSP or CPU, thresholding selection control
Module, symbol determination module.
Energy computation module is that the computing that takes absolute value is carried out to the data signal after demodulation, and the size of absolute value just represents letter
The size of number energy, the absolute value will give thresholding selection control module and symbol determination module carries out computing.
The energy value and the energy threshold of DSP or CPU configurations that thresholding selection control module calculates according to energy computation module
Value dynamically carries out energy threshold control；
The energy value of data signal and dynamic energy door after the demodulation that symbol determination module calculates energy computation module
Limit value is compared the symbol value that computing output judges.
Second step DSP or CPU configure primary power threshold value
DSP or CPU selects thresholding the initial energy threshold of control module Configuration Online, and primary power threshold value is used
To shield noise, when there is data-signal, this value can be changed dynamically；
3rd step energy computation module calculates the energy value of signal after demodulation
After having data to be demodulated, energy computation module carries out the computing that takes absolute value to the data signal of demodulation, definitely
The size of value is with regard to the size of representation signal energy, and the absolute value will give thresholding selection control module and symbol determination module is carried out
Computing.
4th step thresholding selection control module calculates and updates dynamic threshold in real time
After energy computation module calculates demodulation after the energy value of signal, when its delay value is less than the half of currency,
The 1/4 of currency is taken as new threshold value, if the half of its delay value is more than currency, the 1/4 of delay value is made
For new threshold value.
5th step symbol determination module carries out symbol judgement, as a result exports
The energy value of data signal and dynamic energy after the demodulation that symbol determination module is calculated according to energy computation module
Threshold value is compared computing, when the energy value is more than dynamic energy threshold, and the data signal be on the occasion of when, symbol
It is determined as 10；When the energy value is more than dynamic energy threshold, and the data signal is negative value, symbol is determined as 01；
When the energy value is less than dynamic energy threshold, symbol is determined as 00；
So far the demodulated signal symbol based on dynamic threshold judgement is completed to judge.
Claims (3)
1. a kind of demodulated signal symbol decision method based on dynamic threshold judgement, it is characterised in that concretely comprise the following steps：
The symbol decision-making system based on dynamic threshold judgement is built first, including：Energy computation module, DSP or CPU, thresholding choosing
Select control module, symbol determination module；
Energy computation module is used to carry out the data signal after demodulation the computing that takes absolute value, and the size of absolute value is with regard to representation signal
The size of energy, the energy value of signal after being demodulated, give the energy value to thresholding selection control module and symbol judges mould
Block carries out computing；
DSP or CPU selects thresholding the initial energy threshold of control module Configuration Online, and primary power threshold value is used for shielding
Noise is covered, this value can be changed dynamically when there is data-signal；
The energy value of signal and DSP or CPU are configured after the demodulation that thresholding selection control module calculates according to energy computation module
Primary power threshold value dynamically carries out energy threshold control, obtains dynamic energy threshold；
The energy value of signal is carried out with dynamic energy threshold after the demodulation that symbol determination module calculates energy computation module
The symbol value that comparison operation output judges.
2. the demodulated signal symbol decision method according to claim 1 based on dynamic threshold judgement, it is characterised in that when
The energy computation module is calculated after demodulation after the energy value of signal, and the energy value after it postpones some cycles is less than currency
Half when, the 1/4 of currency is taken as new energy threshold, if the one of its energy value after postponing some cycles is medium-sized
In currency, then using 1/4 of the energy value after postponing some cycles as new energy threshold.
3. the demodulated signal symbol decision method according to claim 2 based on dynamic threshold judgement, it is characterised in that institute
State the energy value of data signal and dynamic energy threshold after the demodulation that symbol determination module is calculated according to energy computation module
Be compared computing, when the energy value is more than dynamic energy threshold, and the data signal be on the occasion of when, symbol is determined as
10；When the energy value is more than dynamic energy threshold, and the data signal is negative value, symbol is determined as 01；When the energy
When value is less than dynamic energy threshold, symbol is determined as 00.
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Citations (5)
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|---|---|---|---|---|
| US20040181419A1 (en) * | 2003-03-15 | 2004-09-16 | Davis Linda Mary | Spherical decoder for wireless communications |
| CN1929668A (en) * | 2006-09-07 | 2007-03-14 | 华为技术有限公司 | Method for dynamically regulating signal detecting threshold, signal detecting method and device |
| CN101577564A (en) * | 2009-06-04 | 2009-11-11 | 南通大学 | Self-adaptive signal frequency spectrum sensing and detection method based on decision threshold |
| CN103378934A (en) * | 2012-04-27 | 2013-10-30 | 中国传媒大学 | 1090MHz ES ADS-B frame signal demodulation method |
| CN103687046A (en) * | 2012-09-26 | 2014-03-26 | 京信通信系统（中国）有限公司 | Detection method and apparatus of random access preamble sequence |
-
2017
- 2017-10-26 CN CN201711013321.5A patent/CN107809401A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040181419A1 (en) * | 2003-03-15 | 2004-09-16 | Davis Linda Mary | Spherical decoder for wireless communications |
| CN1929668A (en) * | 2006-09-07 | 2007-03-14 | 华为技术有限公司 | Method for dynamically regulating signal detecting threshold, signal detecting method and device |
| CN101577564A (en) * | 2009-06-04 | 2009-11-11 | 南通大学 | Self-adaptive signal frequency spectrum sensing and detection method based on decision threshold |
| CN103378934A (en) * | 2012-04-27 | 2013-10-30 | 中国传媒大学 | 1090MHz ES ADS-B frame signal demodulation method |
| CN103687046A (en) * | 2012-09-26 | 2014-03-26 | 京信通信系统（中国）有限公司 | Detection method and apparatus of random access preamble sequence |
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