CN1180541C - Ruike receiver multipath searching device using energy readjust and multipath searching method - Google Patents
Ruike receiver multipath searching device using energy readjust and multipath searching method Download PDFInfo
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- CN1180541C CN1180541C CNB021117462A CN02111746A CN1180541C CN 1180541 C CN1180541 C CN 1180541C CN B021117462 A CNB021117462 A CN B021117462A CN 02111746 A CN02111746 A CN 02111746A CN 1180541 C CN1180541 C CN 1180541C
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Abstract
The present invention uses a multi-path searching device of a Ruike receiver using relative energy for correction and a multi-path searching method thereof. The device comprises a relevant pilot frequency unit, a shaping IIR (infinite impulse response) filter, a finding unit for relative waveform peak value positions, and an energy correction unit. The method is used for correcting relative energy, and correcting relative delay energy in a chip (a code sheet) at the front and the back of the peak position. The present invention can avoid leakage detection caused by multi-path peak value with large energy covering small multi-path peak value in multi-path searching, increase the gain of multi-path merging, reduce the distort generated by fading, and reduce the bit error rate of the Ruike receiver.
Description
Technical field
The present invention relates to the multipath searching device and the multipath searching method of spread spectrum radio communications system Rake (Rake) receiver.
Background technology
Spread spectrum technic is a kind of communication means, and at transmitting terminal, the signal that launch and frequency bandwidth are that its spreading code of several times to several ten thousand times multiplies each other, and send with broadband signal then.Receiving terminal produce one with transmitting terminal be used for the spreading code of spread spectrum synchronous separate extended code, the signal that receives and separate extended code and multiply each other and recover narrow band information.
In multipath propagation, both there had been the direct-view path in the radio propagation path between the transmitter and receiver, also existed by building construction or situation that the woods stopped.Through the repeatedly reflection of object, electromagnetic wave arrives receiver with different propagation paths, according to the phase place of each multipath signal arrival receiver, and signal after the addition or stack enhancing, or offset and weaken, mobile channel will produce signal fadeout.Yet the fluctuating of multipath signal is separately independently, and therefore suitably making up multipath signal just can obtain the path diversity effect.
The regularity of distribution of multidiameter meets and is evenly distributed rule, and decline meets the Rayleigh fading rule, because travelling carriage and the relative motion of object on every side cause distribution and amplitude at different moment multipaths also to change.
Fig. 1 is the structure chart of prior art spread spectrum radio communications system Rake receiver, and shows the relevant position of Rake receiver multipath searcher in whole Rake receiver of the present invention.The Rake receiver comprises channel estimator 1, multipath 2 and maximal ratio combiner 3.
Fig. 2 does not adopt the primary structure of the spread spectrum radio communications system Rake receiver multipath searcher of correlation energy correction for prior art.This multipath searching device comprises that the pilot tone correlation unit 21, shaping filter 22, the correlation energy waveform peak that are linked in sequence ask for unit 23.
The purpose of Multipath searching is the multipath that search signal may exist, and the row filter of going forward side by side provides the delayed data in several the strongest footpaths of signal for maximal ratio combiner and channel estimator.In the spread spectrum radio communications system communication system, uplink downlink has all inserted frequency pilot sign in DPCH, and, in down link, also have a common pilot channel to launch pilot signal continuously, thereby can utilize pilot signal to carry out correlation reception Multipath searching and channel estimating.As the step 1 of Multipath searching be: in the certain time-delay time range, utilize matched filter or sliding correlation detector group to do relevant treatment with expanding scrambler to received signal earlier, promptly descrambling and de-spreading goes out to import pilot signal.Input pilot signal and known pilot symbols are carried out relevant treatment, and delivery obtains the correlation energy on each delay position.Utilize first order IIR (infinite impulse response) filter that it is carried out obtaining level and smooth correlation energy waveform after the long-term shaping then.The information of the correlation energy in the detecting certain time-delay time range be it is generally acknowledged to have covered the time-delay position that most multipath exists on the higher time-delay position of energy.Seek a plurality of delay positions, and these mutual incoherent multipath delay information are sent in channel estimator and the maximal ratio combiner handle with peak-peak correlation energy.
Through inquiry, the disclosed patent application about code division multiple address communication system multipath searching method and device thereof has:
00111563.4 the method and apparatus of code division multiple address communication system Multipath searching;
00115307.2 code division multiple access system multipath searching method and device under the antenna diversity condition of acceptance;
00115314.5 the multipath searching method of code division multiple address communication system and device thereof;
A 00119528.X new code division multiple access system Multipath searching and distribution method.
In existing these technology, the correlation that receives pilot signal all is not further processed again, just directly carry out Multipath searching, and all above-mentioned Multipath searching sides are all at Multipath searching.And not to receiving the relevant later energy process of pilot signal.
Because in actual conditions, two footpaths are suffered very closely probably, when two footpaths at a distance of in two chip (chip) time, the footpath that energy is big just may mask another peak value directly, will miss that little footpath of energy during Multipath searching, thereby cause omission.For avoiding this a kind of situation, the present invention has carried out a kind of energy correction and has handled in multipath.At first find out peak, chip before and after this position is respectively postponed correlation energy correction with interior, promptly deduct the contribute energy of peak value correlation energy each position around it respectively with ceiling capacity.Article one, the formed relevant peaks in footpath is general only has value in the scope of each chip of the both sides, position in footpath, so all the other positions can think 0.After revising energy, go for second peak again.By that analogy, up to finding out required multipath number.
Summary of the invention
The objective of the invention is the deficiency in the existing multipath searching device pilot tone correlation not handled in order to overcome, and provide a kind of have the correlation that receives pilot signal searched for before the multipath searching device and the multipath searching method thereof of spread spectrum radio communications system receiver of energy correction function.
The object of the present invention is achieved like this:
Adopt the Rake receiver multipath searching device of correlation energy correction, comprise that the pilot tone correlation unit, shaping IIR (infinite impulse response) filter and the correlation energy waveform peak position that are linked in sequence ask for the unit; Wherein:
The pilot tone correlation unit is finished the relevant treatment that receives pilot signal and known pilot symbols, obtains the correlation energy of each delay position;
The shaping infinite impulse response filter carries out long-term shaping to correlation energy and obtains level and smooth correlation energy waveform;
The search that the unit is used for multipath is asked in correlation energy waveform peak position, in the correlation energy waveform behind infinite impulse response filter, finds out the peak with ceiling capacity;
Be characterized in, also comprise an energy correction unit, the input of this energy correction unit is connected with the output that the unit is asked in correlation energy waveform peak position, and its output is asked for the unit input with correlation energy waveform peak position and is connected; This energy correction unit is used for that the correlation energy of exporting the unit is asked in correlation energy waveform peak position to be revised, and its correction value feeds back to the input that the unit is asked in correlation energy waveform peak position again.
The method that a kind of Rake receiver multipath searching device that adopts the correlation energy correction is carried out the correlation energy correction is characterized in, may further comprise the steps:
(1) at first, baseband signal each delay position in certain delay scope to input, descrambling and de-spreading goes out to import frequency pilot sign, to in the pilot tone correlation unit, carrying out relevant treatment, obtain the correlation energy of corresponding each delay position through input frequency pilot sign behind the descrambling and de-spreading and known pilot symbols;
(2) correlation energy of each delay position is input to the shaping infinite impulse response filter, carries out long-term shaping filter, obtain the level and smooth correlation energy waveform of each delay position with correlation energy in the previous time slot;
(3) the correlation energy waveform is input to correlation energy waveform peak position and asks for the unit, carry out the search of multi-path location, find out peak with ceiling capacity;
(4) this position is input to the energy correction unit with the correlation energy waveform, removes the correlation energy at peak place, respectively postponing correlation energy correction in the chip (chip) before and after the peak;
(5) get back to step (3), ask for the unit be input to correlation energy waveform peak position through revised energy waveform, carry out the search of next multi-path location, so circulation is up to finding out required multipath number.
The method that the Rake receiver multipath searching device of above-mentioned employing correlation energy correction is carried out the correlation energy correction, wherein, each delay position in certain delay scope described in the step (1) is meant each sample position.
The method that the Rake receiver multipath searching device of above-mentioned employing correlation energy correction is carried out the correlation energy correction, wherein, step (4) is described is meant to ask for the correlation energy that the unit obtains from correlation energy waveform peak position and deducts the contribute energy of peak energy in each delay position respectively the correlation energy correction that respectively postpones in chip before and after the peak.
Because the present invention has adopted above technical scheme, in receiver, increase by an energy correction unit, can effectively search out at a distance of two closer multipaths through the Multipath searching after the energy correction processing, avoid the omission that when Multipath searching, causes because the big multipath peak value of energy masks the less relatively multipath peak value of energy.Thereby increased the gain that multipath merges, reduced the distortion that produces owing to decline, reduced the error rate of Rake receiver.
Description of drawings
Concrete feature of the present invention, performance are further specified by following embodiment and accompanying drawing thereof.
Fig. 1 is the structure chart of the whole spread spectrum radio communications system Rake of prior art receiver.
Fig. 2 is not for adopting the primary structure of the spread spectrum radio communications system Rake receiver multipath searcher of correlation energy correction in the prior art.
Fig. 3 adopts the structural representation of the spread spectrum radio communications system Rake receiver multipath searcher of correlation energy correction for the present invention.
Embodiment
See also Fig. 3.The present invention adopts the spread spectrum radio communications system Rake receiver multipath searcher of correlation energy correction, comprises that the pilot tone correlation unit 31, shaping IIR (infinite impulse response) filter 32 and the correlation energy waveform peak position that are linked in sequence ask for unit 33; Wherein: the pilot tone correlation unit is finished the relevant treatment that receives pilot signal and known pilot symbols, obtains the correlation energy of each delay position; The shaping iir filter carries out long-term shaping to correlation energy and obtains level and smooth correlation energy waveform; The search that the unit is used for multipath is asked in correlation energy waveform peak position, in the correlation energy waveform behind iir filter, finds out the peak with ceiling capacity; Also comprise an energy correction unit 34, the input of this energy correction unit is connected with the output that the unit is asked in correlation energy waveform peak position, and its output is connected with the input of the input of energy correction unit; This energy correction unit is used for the correlation energy of energy correction unit output is revised, and its correction value feeds back to the input of energy correction unit again.
The method that the present invention adopts the spread spectrum radio communications system Rake receiver multipath searched devices of correlation energy correction to carry out Multipath searching mainly contains following steps:
(1) at first; each delay position in certain delay scope (as each sample position); descrambling and de-spreading goes out to import frequency pilot sign; to carrying out relevant treatment through input frequency pilot sign behind the descrambling and de-spreading and known pilot symbols in the pilot tone correlation unit, and delivery obtains the correlation energy of corresponding each delay position.
(2) correlation energy of each delay position is input to shaping IIR (infinite impulse response) filter, carries out long-term shaping filter, obtain the level and smooth correlation energy waveform of each delay position with correlation energy in the previous time slot.
(3) the correlation energy waveform is input to correlation energy waveform peak position and asks for the unit, carry out the search of multi-path location, find out peak with ceiling capacity.
(4) this position is input to the energy correction unit with the correlation energy waveform, remove the correlation energy at peak place, chip (chip) before and after the peak are respectively postponed correlation energy correction with interior, promptly deduct the contribute energy of peak value correlation energy each position around it respectively.
(5) get back to step (3), ask for the unit be input to correlation energy waveform peak position through revised energy waveform, carry out the search of next multi-path location, so circulation is up to finding out required multipath number.
According to the correlation properties of scrambler, the formed relevant peaks in footpath only has value in the scope of each chip (chip) of the both sides, position in footpath, and all the other positions can think 0.
Chip before and after the peak is respectively postponed correlation energy correction with interior, and the code of execution is as follows:
energy[k]-＝energy[p]*coefficient[abs(p-k)]；
Energy[k wherein] be correlation energy in each delay position, energy[p] path position energy for searching with ceiling capacity, coefficient coefficient[x] definition just according to cosine function, its value is as follows:
coefficient[x]＝cos[x*/NS]
NS is the hits of each chip in the formula.
Because amplitude is little, the uncertain less footpath of phase place, it will never make a big impact to declaring of big footpath.And the big footpath of energy is just very big to the influence of path.By the present invention chip before and after the peak is respectively postponed correlation energy correction with interior, eliminate of the influence of the bigger footpath of energy to other footpath, and then go for second, the 3rd ... the omission that causes because the big multipath peak value of energy masks the less relatively multipath peak value of energy can be avoided in n required footpath when Multipath searching.Thereby increased the gain that multipath merges, reduced the distortion that produces owing to decline, reduced the error rate of Rake receiver.
Claims (4)
1, a kind of Rake receiver multipath searching device that adopts the correlation energy correction comprises that the pilot tone correlation unit, shaping infinite impulse response filter and the correlation energy waveform peak position that are linked in sequence ask for the unit; Wherein:
The pilot tone correlation unit is finished the relevant treatment that receives pilot signal and known pilot symbols, obtains the correlation energy of each delay position;
The shaping infinite impulse response filter carries out long-term shaping to correlation energy and obtains level and smooth correlation energy waveform;
The search that the unit is used for multipath is asked in correlation energy waveform peak position, in the correlation energy waveform behind infinite impulse response filter, finds out the peak with ceiling capacity;
It is characterized in that, also comprise an energy correction unit, the input of this energy correction unit is connected with the output that the unit is asked in correlation energy waveform peak position, and its output is asked for the unit input with correlation energy waveform peak position and is connected; This energy correction unit is used for that the correlation energy of exporting the unit is asked in correlation energy waveform peak position to be revised, and its correction value feeds back to the input that the unit is asked in correlation energy waveform peak position again.
2, a kind of Rake receiver multipath searching device that adopts correlation energy correction method of carrying out the correlation energy correction is characterized in that, may further comprise the steps:
(1) at first, baseband signal each delay position in certain delay scope to input, descrambling and de-spreading goes out to import frequency pilot sign, to in the pilot tone correlation unit, carrying out relevant treatment, obtain the correlation energy of corresponding each delay position through input frequency pilot sign behind the descrambling and de-spreading and known pilot symbols;
(2) correlation energy of each delay position is input to the shaping infinite impulse response filter, carries out long-term shaping filter, obtain the level and smooth correlation energy waveform of each delay position with correlation energy in the previous time slot;
(3) the correlation energy waveform is input to correlation energy waveform peak position and asks for the unit, carry out the search of multi-path location, find out peak with ceiling capacity;
(4) this position is input to the energy correction unit with the correlation energy waveform, removes the correlation energy at peak place, respectively postponing correlation energy correction in chip before and after the peak;
(5) get back to step (3), ask for the unit be input to correlation energy waveform peak position through revised energy waveform, carry out the search of next multi-path location, so circulation is up to finding out required multipath number.
3, a kind of Rake receiver multipath searching device that adopts the correlation energy correction according to claim 2 method of carrying out the correlation energy correction, it is characterized in that each delay position in certain delay scope described in the step (1) is meant each sample position.
4, a kind of Rake receiver multipath searching device that adopts the correlation energy correction according to claim 2 method of carrying out the correlation energy correction, it is characterized in that step (4) is described to be meant to ask for the correlation energy that the unit obtains from correlation energy waveform peak position and to deduct the contribute energy of peak energy in each delay position respectively the correlation energy correction that respectively postpones in chip before and after the peak.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021117462A CN1180541C (en) | 2002-05-20 | 2002-05-20 | Ruike receiver multipath searching device using energy readjust and multipath searching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021117462A CN1180541C (en) | 2002-05-20 | 2002-05-20 | Ruike receiver multipath searching device using energy readjust and multipath searching method |
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| CN1459928A CN1459928A (en) | 2003-12-03 |
| CN1180541C true CN1180541C (en) | 2004-12-15 |
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| CNB021117462A Expired - Lifetime CN1180541C (en) | 2002-05-20 | 2002-05-20 | Ruike receiver multipath searching device using energy readjust and multipath searching method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100459445C (en) * | 2005-09-18 | 2009-02-04 | 华为技术有限公司 | Method, apparatus and receiving apparatus for multi-path searching |
| CN101167287B (en) * | 2005-10-11 | 2011-05-18 | 中兴通讯股份有限公司 | A mixed-path processing method in CDMA system |
| CN101882944B (en) * | 2010-06-29 | 2014-04-30 | 中兴通讯股份有限公司 | Method and device for combining multi-path searching results |
| CN106443719B (en) * | 2016-09-09 | 2019-02-05 | 中国人民解放军国防科学技术大学 | A kind of solution in frequency domain method based on improvement Rake structure |
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Owner name: BEIER AERKATE CO., LTD., SHANGHAI Free format text: FORMER NAME: BELL CO.,LTD., SHANGHAI Owner name: SHANGHAI ALCATEL-LUCENT CO., LTD. Free format text: FORMER NAME: BEIER AERKATE CO., LTD., SHANGHAI |
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Address after: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Patentee after: ALCATEL-LUCENT SHANGHAI BELL Co.,Ltd. Address before: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Patentee before: Shanghai Bell Alcatel Co.,Ltd. Address after: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Patentee after: Shanghai Bell Alcatel Co.,Ltd. Address before: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Patentee before: Shanghai Bell Co.,Ltd. |
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Address after: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Patentee after: NOKIA SHANGHAI BELL Co.,Ltd. Address before: 201206 Pudong New Area Jinqiao Export Processing Zone, Nanjing Road, No. 388, Shanghai Patentee before: ALCATEL-LUCENT SHANGHAI BELL Co.,Ltd. |
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Granted publication date: 20041215 |