CN101873276B - Signal channel estimation post processing method and receiving equipment - Google Patents
Signal channel estimation post processing method and receiving equipment Download PDFInfo
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- CN101873276B CN101873276B CN 201010191327 CN201010191327A CN101873276B CN 101873276 B CN101873276 B CN 101873276B CN 201010191327 CN201010191327 CN 201010191327 CN 201010191327 A CN201010191327 A CN 201010191327A CN 101873276 B CN101873276 B CN 101873276B
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Abstract
The invention discloses a signal channel estimation post processing method and receiving equipment, which relate to the field of communication. In the invention, signal channel estimation results are backed up before the post processing on the signal channel estimation results. After the post processing, the invention judges whether signals of all paths in the current user window are processed into 0 or not, and if so, a receiving end recovers the signal channel estimation in the current user window according to the backup signal channel estimation results. Because when the signals of all paths in the current user window are processed into 0, the signal channel estimation in the current user window is recovered, relevant processing can still be carried out on the signals of the users in the subsequent operation, and the demodulation is continuously tried to be carried out. Thereby, the correct demodulation becomes possible, and the receiving performance is improved.
Description
Technical field
The present invention relates to the communications field, particularly the channel estimation technique in the communications field.
Background technology
TD SDMA (Time Division Synchronous CodeDivision MultipleAccess SCDMA, be called for short " TD-SCDMA ") as the 3-G (Generation Three mobile communication system) standard that is proposed by China, combine a series of new and high technologies such as time division duplex, code division multiple access, joint-detection, smart antenna, baton handover, have the characteristics such as the availability of frequency spectrum is high, development cost is low, the asymmetric transmission of adaptation, have broad application prospects.In the TD-SCDMA system, the training sequence code (Middleamble) that contains 144Chip (chip) at the tundish of each time slot, be used for receiving terminal and carry out channel estimating, perhaps the detection of Basic Middleamble (basic training sequences code) etc.Receiving terminal only after carrying out channel estimating, can carry out demodulation to the data on time slot, and the transmission reception technique in the TD-SCDMA system can be also 11061257 United States Patent (USP) referring to the patent No..
At present, in the TD-SCDMA receiving terminal, after channel estimating, for obtaining more reliable channel estimating to guarantee receptivity, generally can carry out some post-processing operation to original channel estimation results, such as noise reduction, activation detection etc., then use the channel estimation results through post-processing operation to carry out the subsequent demodulation processing to the data on time slot.
Yet the present inventor finds, due to the various scene of needs reply, the reprocessing of present channel estimating is difficult to the treatment effect that reaches desirable.Such as, under some scene (as the signal strength signal intensity in path in other user's windows obviously greater than the footpath signal strength signal intensity in this user window), this user's channel estimating can be detected as noise, after reprocessing, all be processed into 0, and then the subsequent operation meeting thinks the signal that does not have this user, and do not go to carry out relevant treatment.Due in this case, can not carry out demodulation to this user's signal in subsequent demodulation, therefore can impact receptivity.
Summary of the invention
The object of the present invention is to provide a kind of signal channel estimation post processing and receiving equipment, avoid in the subsequent operation of receiving terminal after channel is estimated not that the signal to this user carries out relevant treatment, thereby cause affecting the problem of receptivity.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of signal channel estimation post processing, comprise following steps:
Receiving terminal backs up channel estimation results after completing channel estimating;
Receiving terminal carries out the reprocessing of channel estimating to channel estimation results;
If after the reprocessing that channel is estimated, in this user window, the signal in all footpaths all is processed into 0, and receiving terminal according to the channel estimation results of backup, recovers the channel estimating in this user window.
Embodiments of the present invention also provide a kind of receiving equipment, comprise:
Channel estimation module is used for carrying out to the received signal channel estimating;
Backup module is used for the channel estimation results of channel estimation module is backed up;
Post-processing module is used for the channel estimation results of channel estimation module is carried out the reprocessing of channel estimating;
Judge module is used for judgement after the reprocessing of post-processing module, and in this user window, whether the signal in all footpaths all is processed into 0;
Recover module, all be processed at 0 o'clock for the signal in all footpaths in judge module is judged this user window, the channel estimation results according to the backup module backup recovers the channel estimating in this user window.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
Before channel estimation results is carried out reprocessing, first channel estimation results is backed up, after the process reprocessing, whether the signal that judges all footpaths in this user window all is processed into 0, if all be processed into 0, receiving terminal according to the channel estimation results of backup, recovers the channel estimating in this user window.When all being processed into 0 due to the signal when all footpaths in this user window, the channel estimating that this user is described is detected as noise, can think the signal that does not have this user in subsequent operation, thereby do not go to carry out relevant treatment, therefore by in this case, the channel estimating in this user window is recovered, can make in subsequent operation and still can carry out relevant treatment to this user's signal, continue to attempt carrying out demodulation, thereby possible demodulation is correct, has improved receptivity.
Further, when the channel estimating in this user window is recovered, receiving terminal only recovers the signal of the most powerful path in this user window, not only process simple, and be the signal of most powerful path due to what recover, improve the correct possibility of subsequent demodulation, when improving receptivity, effectively controlled the consumption to system resource.
Further, when the channel estimating in this user window was recovered, receiving terminal also can recover most powerful path in this user window and the signal in two footpaths adjacent with this most powerful path.Due to rule of thumb as can be known, two footpaths adjacent with this most powerful path, it is also often the larger footpath of signal strength signal intensity, therefore by recovering most powerful path in this user window and the signal in two footpaths adjacent with this most powerful path, under the prerequisite that reduces as far as possible complexity, the further correct possibility of demodulation that improves.
Further, when the channel estimating in this user window was recovered, receiving terminal also can be according to the degree of strength of signal, from the signal in the footpath of predetermined number in weak this user of recovery window by force, made the technical program to realize flexibly.
Further, when channel estimation results is backed up, only back up each footpath signal in this user window.It is the problem of this user's signal not being carried out relevant treatment in order to solve in subsequent operation due to the technical program, also only need the channel estimating in this user of recovery window when recovering, therefore when backup, only need each footpath signal in this user of backup window, can effectively avoid the waste of system resource.
Description of drawings
Fig. 1 is the signal channel estimation post processing flow chart according to first embodiment of the invention;
Fig. 2 is according to the channel estimation results schematic diagram in first embodiment of the invention;
Fig. 3 is according to the channel estimation results schematic diagram after post-processing operation in first embodiment of the invention;
Fig. 4 is the schematic diagram according to most powerful path signal in this user of the recovery window in first embodiment of the invention;
Fig. 5 is the structural representation according to the receiving equipment of four embodiment of the invention.
Embodiment
In the following description, in order to make the reader understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to a kind of signal channel estimation post processing, and idiographic flow as shown in Figure 1.
In step 110, receiving terminal carries out channel estimating to the received signal, and the receiving terminal in present embodiment is the receiving terminal in the TD-SCDMA system.
Specifically, to the scattering of electric wave, ionosphere reflection and the refraction to electric wave, and the earth's surface object such as chain of mountains, building all can cause multipath transmisstion to the reflection of electric wave due to atmosphere.Therefore at wireless communication field, wireless signal will arrive at reception antenna through a plurality of paths from transmitting antenna.The training sequence code (Middleamble) of the 144Chip (chip) that receiving terminal in the TD-SCDMA system comprises in by each time slot carries out channel estimating, and the channel estimating that receiving terminal carries out is same as the prior art, does not repeat them here.The channel estimation results that receiving terminal obtains recovers each footpath signal as shown in Figure 2 in each window, in Fig. 2, interior each vertical line of window represents the signal in each footpath, and the height of vertical line represents the degree of strength of this footpath signal.
Then, in step 120, receiving terminal backs up channel estimation results after completing channel estimating.Receiving terminal can only back up each footpath signal in this user window when backing up.
Then, in step 130, receiving terminal carries out the reprocessing of channel estimating to channel estimation results, such as noise reduction, activation detection etc.Channel estimation results after post-processing operation as shown in Figure 3.Post-processing operation in this step is carried out to such an extent that post-processing operation is identical with of the prior art to original channel estimation results, does not repeat them here.
Then, in step 140, receiving terminal checks the reprocessing result, judges whether the signal in all footpaths in this user window all is processed into 0, if all be processed into 0, enters step 150, otherwise process ends.
In step 150, receiving terminal recovers the channel estimating in this user window according to the channel estimation results of backup.Specifically, in this step, receiving terminal only recovers the signal of the most powerful path in this user window, as shown in Figure 4.
Be not difficult to find, when all being processed into 0 due to the signal when all footpaths in this user window, illustrate that this user's channel estimating is detected as noise, can think the signal that does not have this user in subsequent operation, thereby do not go to carry out relevant treatment.Therefore in the present embodiment, in this case, the channel estimating in this user window is recovered, can make in subsequent operation and still can carry out relevant treatment to this user's signal, continue to attempt carrying out demodulation, thereby possible demodulation is correct, has improved receptivity.And when the channel estimating in this user window is recovered, receiving terminal only recovers the signal of the most powerful path in this user window, not only process simple, and be the signal of most powerful path due to what recover, improved the correct possibility of subsequent demodulation, when improving receptivity, effectively controlled the consumption to system resource.
In addition, when channel estimation results is backed up, can only back up each footpath signal in this user window.It is the problem of this user's signal not being carried out relevant treatment in order to solve in subsequent operation due to present embodiment, also only need the channel estimating in this user of recovery window when recovering, therefore when backup, only need each footpath signal in this user of backup window, can effectively avoid the waste of system resource.
Need to prove, be that receiving terminal in take receiving terminal as the TD-SCDMA system describes as example in present embodiment, but it will be understood by those skilled in the art that in actual applications, present embodiment is also applicable to other network systems, as Wideband Code Division Multiple Access (WCDMA) WCDMA, CDMA 2000 etc.
Second embodiment of the invention relates to a kind of signal channel estimation post processing.The second execution mode and the first execution mode are basic identical, and difference mainly is:
In the first embodiment, receiving terminal only recovers the signal of the most powerful path in this user window when the channel estimating in this user window is recovered.Yet receiving terminal is when recovering the channel estimating in this user window, according to the degree of strength of signal, from the signal in the footpath of predetermined number in weak this user of recovery window by force in the present embodiment.
Such as predetermined number is 3, and receiving terminal when the channel estimating in this user window is recovered, according to each footpath signal in this user window of backup, recovers the signal of 3 paths that in this user window, signal is the strongest.
Third embodiment of the invention relates to a kind of signal channel estimation post processing.The 3rd execution mode and the first execution mode are basic identical, and difference mainly is:
In the first embodiment, receiving terminal only recovers the signal of the most powerful path in this user window when the channel estimating in this user window is recovered.Receiving terminal recovers most powerful path in this user window and the signal in two footpaths adjacent with this most powerful path when the channel estimating in this user window is recovered yet in the present embodiment.
Due to rule of thumb as can be known, two footpaths adjacent with this most powerful path, it is also often the larger footpath of signal strength signal intensity, therefore by recovering most powerful path in this user window and the signal in two footpaths adjacent with this most powerful path, under the prerequisite that reduces as far as possible complexity, the further correct possibility of demodulation that improves.
In addition, be appreciated that in actual applications, also can adopt other modes that the channel estimating in this user window is recovered, do not enumerate at this.
Each method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the memory of computer-accessible of any type (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).equally, memory can be for example programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.
Four embodiment of the invention relates to a kind of receiving equipment, and the receiving equipment in present embodiment is the receiving equipment in the TD-SCDMA system.As shown in Figure 5, this receiving equipment comprises:
Channel estimation module is used for carrying out to the received signal channel estimating.
Backup module is used for the channel estimation results of channel estimation module is backed up.Backup module can only back up each footpath signal in this user window when backing up.
Post-processing module is used for the channel estimation results of channel estimation module is carried out the reprocessing of channel estimating.
Judge module is used for judgement after the reprocessing of post-processing module, and in this user window, whether the signal in all footpaths all is processed into 0.
Recover module, all be processed at 0 o'clock for the signal in all footpaths in judge module is judged this user window, the channel estimation results according to the backup module backup recovers the channel estimating in this user window.In the present embodiment, recover the signal that module is only recovered the most powerful path in this user window.
Be not difficult to find, the first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
Fifth embodiment of the invention relates to a kind of receiving equipment.The 5th execution mode and the 4th execution mode are basic identical, and difference mainly is:
In the 4th execution mode, recover the signal that module is only recovered the most powerful path in this user window.Yet in the present embodiment, recover module according to the degree of strength of signal, from the signal in the footpath of predetermined number in weak this user of recovery window by force.
Be not difficult to find, the second execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the second execution mode.The correlation technique details of mentioning in the second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the second execution mode.
Sixth embodiment of the invention relates to a kind of receiving equipment.The 6th execution mode and the 4th execution mode are basic identical, and difference mainly is:
In the 4th execution mode, recover the signal that module is only recovered the most powerful path in this user window.Yet in the present embodiment, recover most powerful path in this user of module recovery window and the signal in two footpaths adjacent with this most powerful path.
Be not difficult to find, the 3rd execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of the 3rd execution mode.The correlation technique details of mentioning in the 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the 3rd execution mode.
Need to prove, each unit of mentioning in each equipment execution mode of the present invention is all logical block, physically, a logical block can be a physical location, it can be also the part of a physical location, can also realize with the combination of a plurality of physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each equipment execution mode of the present invention will not introduced not too close unit with solving technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (12)
1. a signal channel estimation post processing, is characterized in that, comprises following steps:
Receiving terminal backs up channel estimation results after completing channel estimating;
Described receiving terminal carries out the reprocessing of channel estimating to described channel estimation results;
If after the reprocessing that channel is estimated, in this user window, the signal in all footpaths all is processed into 0, and described receiving terminal according to the channel estimation results of described backup, recovers the channel estimating in this user window.
2. signal channel estimation post processing according to claim 1, is characterized in that, in the described step that channel estimating in this user window is recovered, comprises following substep:
Described receiving terminal only recovers the signal of the most powerful path in this user window.
3. signal channel estimation post processing according to claim 1, is characterized in that, in the described step that channel estimating in this user window is recovered, comprises following substep:
Described receiving terminal is according to the degree of strength of signal, from the signal in the footpath of predetermined number in weak this user of recovery window by force.
4. signal channel estimation post processing according to claim 1, is characterized in that, described receiving terminal recovers most powerful path in this user window and the signal in two footpaths adjacent with this most powerful path.
5. the described signal channel estimation post processing of any one according to claim 1 to 4, is characterized in that, in the described step that channel estimation results is backed up, comprises following substep:
Described receiving terminal only backs up each footpath signal in this user window.
6. the described signal channel estimation post processing of any one according to claim 1 to 4, is characterized in that, described signal channel estimation post processing is applied in TD SDMA TD-SCDMA system.
7. a receiving equipment, is characterized in that, comprises:
Channel estimation module is used for carrying out to the received signal channel estimating;
Backup module is used for the channel estimation results of described channel estimation module is backed up;
Post-processing module is used for the channel estimation results of described channel estimation module is carried out the reprocessing of channel estimating;
Judge module is used for judgement after the reprocessing of described post-processing module, and in this user window, whether the signal in all footpaths all is processed into 0;
Recover module, all be processed at 0 o'clock for the signal in all footpaths in described judge module is judged this user window, the channel estimation results according to described backup module backup recovers the channel estimating in this user window.
8. receiving equipment according to claim 7, is characterized in that, described recovery module is only recovered the signal of the most powerful path in this user window.
9. receiving equipment according to claim 7, is characterized in that, described recovery module is according to the degree of strength of signal, from the signal in the footpath of predetermined number in weak this user of recovery window by force.
10. receiving equipment according to claim 7, is characterized in that, the signal in the most powerful path in described this user of recovery module recovery window and two footpaths adjacent with this most powerful path.
11. according to claim 7 to 10, the described receiving equipment of any one, is characterized in that, described backup module only backs up each footpath signal in this user window when carrying out described backup.
12. according to claim 7 to 10, the described receiving equipment of any one, is characterized in that, described receiving equipment is the receiving equipment in TD SDMA TD-SCDMA system.
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