CN104601274B - Demapping device and method - Google Patents
Demapping device and method Download PDFInfo
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- CN104601274B CN104601274B CN201310534681.5A CN201310534681A CN104601274B CN 104601274 B CN104601274 B CN 104601274B CN 201310534681 A CN201310534681 A CN 201310534681A CN 104601274 B CN104601274 B CN 104601274B
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- demapping
- data
- quantizer
- offset data
- count results
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
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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
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/0328—Arrangements for operating in conjunction with other apparatus with interference cancellation circuitry
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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
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/03286—Arrangements for operating in conjunction with other apparatus with channel-decoding circuitry
-
- 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
- H04L25/03878—Line equalisers; line build-out devices
- H04L25/03885—Line equalisers; line build-out devices adaptive
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention relates to a kind of demapping device and method, described device includes：Averager receives offset data and judges the degree size of compensation；Demapping function module receives offset data, and exports a demapping offset data after carrying out demapping；Quantizer is coupled to the averager and demapping function module, and according to the degree size of above-mentioned compensation and a quantization maximum value, above-mentioned demapping offset data is quantified；Counter is coupled to the quantizer to receive the quantized data exported by quantizer, carries out the counting of maxima and minima in the quantized data and exports a count results, while providing the quantization maximum value to the quantizer；And compressor reducer, it is coupled to the counter, compressing the count results to reduce bit number.
Description
【Technical field】
The invention relates to a kind of demapping device and methods, more specifically relate to a kind of according to channel conditions
And input data is automatically judged and determines the demapping device and method most preferably exported.
【Background technology】
In general, de-mapping device（Demapper）Play following effect：After carrying out channel compensation to received data, root
According to modulation（Modulation）After each de-mapping process, the size appropriate with soft decision bits number or so is made
Channel decoder inputs.
Herein, after demapping, the output of de-mapping device is not set as hard decision and is using the reason of soft-decision, made
Apply soft-decision input relatively application hard decision input for the input of channel decoder, theoretically, in AWGN（Additive
White Gaussian Noise, additive white Gaussian noise）There is the performance gain of 2.2dB in channel.
However, no matter how to increase soft decision bits number in de-mapping device, gain will not persistently become larger, de-mapping device
Output bit number determine in common communication system positioned at de-mapping device rear end deinterleaver memory size.Cause
This focuses on following aspect when designing de-mapping device：Make performance reduced minimum, and less outflow output bit number.
Well known de-mapping device has the following structure to reach object above：Precalculate the data of channel compensation
Appropriate location, to from corresponding position, be exported according to soft decision bits number degree, the data of channel compensation are bases
The reference gain value of automatic gain control device in front of de-mapping device, enters as the input of de-mapping device.
This method is to determine the flat of the data that channel compensates using the reference gain value according to automatic gain control device
Method in terms of equal level, in the case where channel condition is common horizontal, it can be expected that good performance.
However, becoming the form that do not expect in channel condition or there are interchannel interference or cochannels the interference letter such as to interfere
In the case of number, the incoming level of de-mapping device can substantially change, if therefore in this case, using merely with automatic gain
The reference level of regulating device, the method that the output of de-mapping device is determined in preset position, then abnormally output solves
The output of mapper.
For example, de-mapping device input compared with normal conditions larger into fashionable, the output of de-mapping device it is most of with
Maximum value outflow is exported, otherwise in the case where the input of de-mapping device more smaller enters, the output of de-mapping device
Most of demapping is 0 and exports.In this case, the performance of entire receiver can not be avoided to decline.
In order under the condition as mentioned above, reduce the performance range of decrease, the output bit number of de-mapping device should be further increased
Ensure the sufficient bit number of channel conditions that reply is not expected, but as noted previously, as common communication system is reflected in solution
Deinterleaver is located in the rear of emitter, therefore the memory of deinterleaver becomes larger according to the degree, therefore is not good solution
Certainly method.
【Invention content】
The problem of invention is to be solved
Therefore, proposed to solve problem as described above the object of the present invention is to provide one kind in order to contract
The memory size of small deinterleaver, reduces the output bit number of de-mapping device, and according to minimizing reduced performance
Channel conditions and input data automatically judged and determine the demapping device and method most preferably exported.
Technical means to solve problem
Demapping device to solve the present invention of purpose as described above is characterized in that：Averager connects
It receives offset data and judges the degree size of compensation；Demapping function module receives the offset data, and carries out demapping
After export a demapping offset data；Quantizer is coupled to the averager and the demapping function module, according to above-mentioned benefit
The degree size repaid and a quantization maximum value, above-mentioned demapping offset data is quantified；Counter is coupled to the amount
Change device to receive the quantized data exported by the quantizer, carries out the meter of maxima and minima in the quantized data
It counts and exports a count results, while providing the quantization maximum value to the quantizer；And compressor reducer, it is coupled to the meter
Number device, compressing the count results to reduce bit number.
In a preferred embodiment, the compressed count results system is input to a deinterlacer, described in diminution
The memory size of deinterlacer.
De-mapping method to solve the present invention of purpose as described above is characterized in that including the following steps：It receives
One offset data and the degree size for judging compensation；Offset data described in demapping；According to the degree size of the compensation and
One quantization maximum value, the demapping offset data is quantified to obtain a quantized data；It counts in the quantized data
Maxima and minima to obtain the quantization maximum value and a count results；And the compression count results, with drop
The bit number of the low count results.
In a preferred embodiment, the count results system for reducing bit number is used to reduce the storage inside the wrong device of a solution
Device size.
The effect of invention
It has the following advantages that present invention as described above：In various channel circumstances, there are interchannel interference, cochannels to interfere
Etc. in the environment of interference signals, demapping device can also automatically adapt to and produce best output, to application and be applicable in
In most of communication system.
In addition, the present invention is by performance reduced minimum, and reduces the output bit number of demapping device and reduce solution and hand over
The memory size of device is knitted, or even with identical memory, also it can be expected that superior performance.
【Description of the drawings】
Fig. 1 is the entire block diagram of the demapping device of the present invention.
[symbol description]
100 averagers
101 quantizers
102 counters
103 compressor reducers
【Specific implementation mode】
If hereinafter, with reference to alterations, the present invention will be described in detail, then as follows.
Fig. 1 is the entire block diagram of the demapping device of the present invention.
Referring to Fig.1, demapping device of the invention removes the demapping function module used in common demapping device
Outside 104, further include：Averager 100 judges the size degree that received data is compensated；Quantizer 101, solution is reflected
The result penetrated quantifies and exports；Counter 102 counts the output maximum value or minimum value of quantified output valve；
And compressor reducer 103, reduce the bit number of final output.
The averager 100 judges the degree of the size of the data of channel compensation.Under normal circumstances, channel compensates
Data size according to positioned at different compared with the demapping device more reference gain value of automatic gain control device in front, but
It is not fixed in channel conditions or there are in the case of multiple interference signals, the input of demapping device is the data of channel compensation
Size can be different.
In this case, demapping device automatically to judge the size of input in order to reasonably spread out of the side of output
Formula is acted, also quantizer of the notice to rear after the size for calculating input.
The quantizer 101 plays following effect：If using the information calculated with output according to the input of demapping device,
The quantization level suitable for current channel conditions is calculated, then on the basis of the value of the quantization level, can be had according to output bit number
Some numbers divide into each section, to determine the output bit number generated by input.
The counter 102 is the output according to quantizer, is counted to the number of the maxima and minima of outflow
And set the maximum value of quantizer.
Even if the input of demapping device is that the average value of the absolute value of the data of channel compensation is identical, there is also bases
The case where output of dispersion value and demapping device is exceedingly tilted to maximum value or minimum value, therefore according to the output of quantizer
The case where maximum value or minimum value are counted respectively, preset ratio appropriate is detached to the ratio of the value at two
Under, the level of quantizer is adjusted again, so as to be exported according to ratio appropriate.
The compressor reducer 103 plays following effect：Performance is slightly reduced, and reduces output bit number, thus reduces solution
The size of memory inside interleaver.
The kind number of the sample spread out of as the output of quantizer is determined according to output bit number, and all samples are utilized
The different aspect of output frequency.
Herein, the compressor reducer 103 is acted as follows：In the sample as the output outflow of quantizer 101, it is divided into
After exporting the high sample of proportion and really not so sample, the low sample of proportion will be exported and be changed to the high sample of neighbouring proportion
Product.
Final output bit number can be changed according to the number of the high sample of proportion is set as how many.It is changed to preferential suitable
The data of the higher sample of sequence also can be indicated only with less bit number, therefore can get following gain：Demapping device it is defeated
Go out bit number diminution, the size of memory is reduced according to the bit number of diminution.
After reducing final output bit number using this process, the input according to channel decoder again should be added and restored
The action of bit number.The data indicated with less bit number revert to priority again according to the input of channel decoder
The output of high original demapping device.
If preferential suitable to being compared with the data that the input of channel decoder restores according to the output of demapping device
The high value full recovery of sequence is replaced at original value, data only with the lower priority by the high data of neighbouring priority, because
The performance decline caused by carry-out bit reduces can be decreased to minimum by this.
The method of the demapping device of the present invention is described as follows in detail below.
First, if averager 100 receives offset data and judges the degree size of compensation and notify to quantizer 101,
The degree size and a quantization maximum value that quantizer is compensated using data, demapping offset data is quantified and is exported
One quantized data.
Then, whether counter 102 judges the signal exported with value appropriate and by result feedback notification to amount again
Change device 101.
Quantizer 101 is again using the information received from counter 102 come adjust quantization level.The process is receiving signal
During continuously realize, even if channel change, can also continue to follow best output.
So that the signal that the counter 102 exports slightly is reduced performance by compressor reducer 103, and reduces output ratio
Special number and reduce the memory size inside deinterleaver.
As described above, in detailed description of the invention, the preferred embodiment of the present invention is illustrated, but at this
Commonsense personnel in technical field that the present invention belongs in the limit for not departing from scope of the invention it is to be appreciated that can realize
Various deformation.Therefore, interest field of the invention should be equal according to claims and with it content determines, without answering
Embodiment described is confined to determine.
Claims (4)
1. a kind of demapping device, which is characterized in that including：
Averager receives offset data and judges the degree size of compensation；
Demapping function module receives the offset data, and exports a demapping offset data after carrying out demapping；
Quantizer is coupled to the averager and the demapping function module, according to the degree size of above-mentioned compensation and one
Quantify maximum value, above-mentioned demapping offset data is quantified；
Counter is coupled to the quantizer to receive the quantized data exported by the quantizer, carries out the quantization
The counting of maxima and minima and one count results of output in data, while the quantization maximum value is provided to the quantization
Device；And
Compressor reducer is coupled to the counter, compressing the count results to reduce bit number.
2. demapping device according to claim 1, which is characterized in that the compressed count results system is input to
One deinterlacer, to reduce the memory size of the deinterlacer.
3. a kind of de-mapping method, which is characterized in that including：
It receives an offset data and judges the degree size of compensation；
Offset data described in demapping；
According to the degree size of the compensation and a quantization maximum value, the offset data of demapping is quantified to obtain
Obtain a quantized data；
The maxima and minima in the quantized data is counted to obtain the quantization maximum value and a count results；And
The count results are compressed, to reduce the bit number of the count results.
4. according to the method described in claim 3, it is characterized in that, the count results system for reducing bit number is for reducing one
Memory size inside deinterlacer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310534681.5A CN104601274B (en) | 2013-11-04 | 2013-11-04 | Demapping device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310534681.5A CN104601274B (en) | 2013-11-04 | 2013-11-04 | Demapping device and method |
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| Publication Number | Publication Date |
|---|---|
| CN104601274A CN104601274A (en) | 2015-05-06 |
| CN104601274B true CN104601274B (en) | 2018-07-13 |
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| CN201310534681.5A Expired - Fee Related CN104601274B (en) | 2013-11-04 | 2013-11-04 | Demapping device and method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305667A (en) * | 1998-06-15 | 2001-07-25 | Dspc技术有限公司 | Method and device for quantizing input to soft decoders |
| CN1722715A (en) * | 2004-07-14 | 2006-01-18 | 明基电通股份有限公司 | Methods and devices for dynamic quantizing input of a soft decision decoder |
| CN1790968A (en) * | 2004-11-12 | 2006-06-21 | 英属开曼群岛威睿电通股份有限公司 | Method and apparatus of two stage scaling and quantization for coded communication systems |
| CN101051843A (en) * | 2006-04-07 | 2007-10-10 | 瑞昱半导体股份有限公司 | Decoder and relative method |
-
2013
- 2013-11-04 CN CN201310534681.5A patent/CN104601274B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305667A (en) * | 1998-06-15 | 2001-07-25 | Dspc技术有限公司 | Method and device for quantizing input to soft decoders |
| CN1722715A (en) * | 2004-07-14 | 2006-01-18 | 明基电通股份有限公司 | Methods and devices for dynamic quantizing input of a soft decision decoder |
| CN1790968A (en) * | 2004-11-12 | 2006-06-21 | 英属开曼群岛威睿电通股份有限公司 | Method and apparatus of two stage scaling and quantization for coded communication systems |
| CN101051843A (en) * | 2006-04-07 | 2007-10-10 | 瑞昱半导体股份有限公司 | Decoder and relative method |
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| CN104601274A (en) | 2015-05-06 |
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