CN101741405B - Receiving method suitable for impulse radio ultra wide band system - Google Patents
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Abstract
The invention discloses a receiving method suitable for an impulse radio ultra wide band system, which captures multipath signal energy by using a pair of orthogonal template signals with the same frequency spectrum components and improves the detection performance of the impulse radio ultra wide band receiver. The method comprises the following steps: (1) according to the modulated signal transmitted by the transmitter, the receiver respectively estimates multipath channel information corresponding to the two template signals by a data assisting method or a blind estimation method; (2) the receiver selects a certain quantity of multipath components as the object of the subsequent diversity combination processing according to the complexity requirement; (3) according to the multipath components selected in step (2), the receiver combines the output variables of the correlator in a maximum ratio or equal-gain way in combination with the channel information obtained in step (1) by utilizing the multipath components in the receiving signal captured by the correlator, thereby obtaining a data symbol decision variable; (4) and the receiver decides the data symbol decision variable obtained in step (3) according to the decision criteria, thereby recovering the data information.
Description
Technical field:
The present invention relates to a kind of method of reseptance that is applicable to impulse radio ultra wide band system, belong to the broadband wireless communications field.
Background technology:
Ultra broadband (UWB) technology relies on advantages such as its two-forty, high-performance, low-power consumption, low cost in recent years, has caused people's extensive concern, and becomes one of short-distance wireless communication technology of optimum competitive and development prospect.The signal bandwidth of ultra broadband emission is extremely wide, and transmitting power is extremely low, therefore can coexist with existing narrowband systems, and does not influence each other, and use free frequency range, has very big development potentiality.According to the definition of FCC (FCC) to ultra-broadband signal, its absolute bandwidth should should be greater than 20% greater than 500MHz or relative bandwidth.At present, radio ultra wide band system can be divided into according to the signal form that adopts: based on the impulse radio (IR-UWB is referred to as pulse ultra-broad band) of nanosecond/subnanosecond level burst pulse with based on the ofdm system (TFC-MB-OFDM) of many bands time frequency coding.
The carrierfree burst pulse that impulse radio ultra wide band system generally adopts nanosecond or subnanosecond level (for example; Gaussian pulse and all-order derivative pulse thereof) carry data information; Data-modulated is conciliate straightening and is connected on the base band completion; Save complicated sinusoidal carrier modulation and demodulation circuit, thereby reduced the complex equipments degree.On modulation technique; General binary phase modulation (BPSK), pulse position modulation (PPM), the pulse amplitude modulation modes such as (PAM) of adopting realizes multi-user communication through THSS (THSS:Time Hopping SpreadSpectrum) or DSSS (DSSS:Direct Sequence Spread Spectrum).
Because ultra-broadband signal has extremely wide bandwidth, after wireless channel is propagated, especially under the indoor propagation environment, signal will experience the decline of serious frequency selectivity.For impulse radio ultra wide band system, receiving end signal is each stack of multipath signal at random, and serious temporal dispersion takes place impulse waveform, reduces greatly with the former correlation that transmits.Therefore, how to detect reliably and receive signal be major issue in the radio ultra wide band system research to receiver.Detect performance in order to improve receiver; The general Rake reception technique that adopts in impulse radio ultra wide band system; Utilize the interdigital multipath signal energy of catching of some; After high specific merging or equal gain combining, carry out symbol judgement on the basis that obtains multipath channel information, thereby obtaining diversity gain.The Rake receiver implementation method has the structure of two kinds of equivalences: based on the structure of correlator with based on the structure of matched filter.
In the traditional rake receiver, general employing is carried out multipath signal with the single template of transmitting pulse waveform coupling and is caught.Wherein the structural form of template signal and modulation system are closely related.In theory, if receiver can obtain precise channels information, adopt the high specific of single template to merge the receptivity that full Rake receiver (MRC All-Rake) can obtain optimum.Yet; Because the multipath quantity of ultra-wideband channel is very big, can to estimate accurately that channel needs high sample rate and algorithm complex up to up to a hundred more than; The complete interdigital number of Rake receiver is up to tens to up to a hundred, and such complexity is difficult to accept in practical application.Therefore; In practical application; Generally between complexity and systematic function, weigh, under the prerequisite that guarantees certain systematic function, adopt the selecting type Rake receiver (Selective-Rake) or the part Rake receiver (Partial-Rake) that reduce complexity; The former selects the strongest several components in multipath component, the latter selects at first several multipath components of arrival.On the merging mode, then can adopt high specific to merge or equal gain combining.RAKE architecture and consolidation strategy are made up, and practical receiver structure comprises: high specific merges selecting type Rake receiver (MRC Selective-Rake), equal gain combining selecting type Rake receiver (EGCSelective-Rake), high specific assembling section Rake receiver (MRC Partial-Rake), equal gain combining part Rake receiver (EGC Partial-Rake).
Existing about the ultra-wideband channel The measured results show, ultra-wideband pulse is after multipath channel is propagated, and its multipath component with former pulsion phase ratio serious distortion takes place, and each multipath component waveform is different.Adopt single template only can catch portion of energy in the multipath component, then lost with the component of template quadrature, its energy capture efficient is not high, causes the detection performance loss.Be the safeguards system bit error rate performance, can only adopt the interdigital quantity of more Rake or improve transmitted power.Theoretically, the detection statistic signal to noise ratio depends on the signal energy that receiver is effectively caught.Therefore, under certain complexity constraint, how effectively to catch the multipath signal energy, improve receiver and detect performance, be still the problem that needs further investigation.
Summary of the invention:
The invention provides a kind of method of reseptance that is applicable to impulse radio ultra wide band system.System adopts extremely short pulse train of duration to transmit data; The modulation system that adopts can be pulse-position modulation (PPM); Pulse-ampli tude modulation (PAM), binary phase modulation (BPSK) also can be the combination of these modulation systems and THSS (TH) or DSSS (DS).This invention has the same frequency spectrum composition for two of employings in receiver and mutually orthogonal local correlate template signal m (t),
catches multipath signal; Interdigital down at identical Rake; Can catch more signal energy, improve receiver and detect performance.
Ultra-broadband signal method of reseptance provided by the invention comprises the steps:
1) modulated signal that sends according to transmitter, by data householder method or blind estimating method, receiver estimates the corresponding multipath channel information of two template signals respectively;
2) receiver is selected the multipath component of some according to the complexity requirement, as the object of follow-up branch set and processing;
3) receiver is according to step 2) selected multipath component; Based on local Orthogonal Double template, utilize correlator to catch and receive multipath component in the signal, integrating step 1) channel information that obtains; The correlator output variable is carried out high specific merge or equal gain combining, obtain the data symbol judgment variables;
4) receiver is adjudicated the data symbol judgment variables that step 3) obtains according to decision rule, restore data information.
Be elaborated in the face of the inventive method down:
The inventive method is: adopt at receiving terminal a pair ofly to have the same frequency spectrum composition and mutually orthogonal local template signal m (t),
catches multipath signal; It is characterized in that: a pair of have same frequency spectrum composition and mutually orthogonal local template signal and adopt following method to realize: adopts a pulse signal p (t) who matees with transmitted pulse as the basic pulse signal, get its Hilbert transform and obtain another basic pulse signal with same frequency spectrum composition
the two satisfies orthogonality relation; According to the modulation system and the multi-access mode that adopt, utilize the local template signal m (t) of two basic pulse signal lineaments, two local template signals of
gained also to satisfy orthogonality relation respectively.
In the said step 1), receiver carries out channel estimating, it is characterized in that: ultra-wideband pulse and complexity constraint according to adopting are confirmed certain acceptable multi-path resolved rate, estimate above-mentioned two mutually orthogonal local template m (t),
Corresponding channel gain h
i,
Be each multipath due in τ of estimating received signal
i, and to the projection of two local template signals (projection value is h
i,
).
Said step 2) in, the selection of multipath component is characterized in that: with local template m (t),
All corresponding multipath components are regarded independently alternative multipath component as, according to the trappable multipath quantity M. of system select wherein the channel gain amplitude (| h
i|,
) M maximum multipath component, and corresponding arrival time delay, channel gain and the corresponding template of each multipath component of selecting of mark, i.e. (τ
i, h
iOr
M (t) or
).Another kind of more simple method is to select M to arrive the minimum multipath component of time delay.
In the said step 3); Multipath signal energy capture and merging; It is characterized in that: M multipath searching branch circuit of configuration and 1 weighted sum circuit in the receiver; According to step 2) selection result, regulate delayer in each branch circuit and make it aim at certain selected multipath component and select corresponding template signal m (t) or
to utilize correlator and receive signal and carry out related operation and accomplish multipath component and catch.M branch circuit correlator output is synchronized sampling, carries out weighted sum then and obtains the data symbol judgment variables, accomplishes rake and merges.When adopting high specific to merge, weighted factor is got corresponding multipath channel gain h
iOr
When adopting equal gain combining, weighted factor is got corresponding multipath channel gain h
iOr
Polarity, promptly+1 or-1.
In the said step 4), data symbol decision rule is characterized in that: according to modulation system and the decision rule that system adopts, according to decision threshold the data symbol judgment variables that step 3) obtains is adjudicated, recover the transmitting terminal data symbol.
This method adopts two mutually orthogonal template capture multipath energies, can effectively catch the multipath component of disperse, improves receiver and detects performance.
Description of drawings:
Fig. 1 has provided the method for reseptance structured flowchart of embodiment of the present invention;
Fig. 2 a is that example provides orthogonal template waveform sketch map with binary system pulse-position modulation (TH-PPM), is example with 15 rank Gaussian pulses;
Fig. 2 b is that example provides orthogonal template waveform sketch map with binary system pulse-position modulation (TH-PPM), is example with 15 rank Gaussian pulses;
Fig. 2 c is that example provides orthogonal template waveform sketch map with binary system pulse-position modulation (TH-PPM), is example with 15 rank Gaussian pulses;
Fig. 2 d is that example provides orthogonal template waveform sketch map with binary system pulse-position modulation (TH-PPM), is example with 15 rank Gaussian pulses;
Fig. 3 is that example has provided the present invention and proposes the bit error rate performance (2 footpaths, 4 footpaths, 8 footpaths) of method of reseptance under the IEEE802.15.3a standard channel CM1 with binary system pulse-position modulation (TH-PPM).
Among Fig. 1: 1: the ultra-wideband antenna module; 2: the receiving filter module; 3: pulse generating module; 4: the template signal generating module; 5: synchronous circuit module; 6: channel estimation module; 7: multipath component is selected module; 8: the multipath component trapping module; 9: multipath component merges module; 10: the symbol judgement module.
Embodiment:
Embodiment:
Accompanying drawing 1 has provided the method for reseptance structured flowchart that embodiment of the present invention proposed.
Receiving system of the present invention is: ultra-wideband antenna module 1 is connected with receiving filter module 2; Receiving filter module 2 is connected with multipath component trapping module 8; Multipath component trapping module 8 merges module 9 with multipath component and is connected, and multipath component merges module 9 and is connected with symbol judgement module 10.Receiving filter module 2 also is connected with channel estimation module 6 simultaneously, and channel estimation module 6 selects module 7 to be connected with multipath component, and multipath component selects module 7 to be connected with multipath component trapping module 8 and multipath component merging module 9 respectively; Receiving filter module 2 also is connected with synchronous circuit module 5; Synchronous circuit module 5 merges module 9 and is connected with symbol judgement module 10 with pulse generating module 3, multipath component respectively; Wherein pulse generating module 3 also is connected with template signal generating module 4, and template signal generating module 4 is connected with multipath component trapping module 8.
The idiographic flow of receiver: ultra broadband transmitted pulse signal gets into receiver by ultra-wideband antenna (ultra-wideband antenna module 1), and accepts filter filtering out-of-band noise and interference after multi-path environment is propagated.Signal carries out related operation completion multipath component with two orthogonal template signals (being produced by template signal generating module 4) and catches (being obtained by multipath component trapping module 8) according to the channel multi-path component (selecting module 7 to accomplish by channel estimation module 6 and multipath component) of selection after the filtering.Then divide set also (merging module 9 by multipath component accomplishes) to the multipath component of catching, obtain the data symbol judgment variables according to merging criterion.Modulation system and the decision rule adopted according to system at last to the adjudicating of data symbol judgement variable, recover transmitting terminal data symbol (being accomplished by symbol judgement module 10) according to decision threshold.In whole receiving course, each processing module must keep (offering synchronizing signal by synchronous circuit module 5) synchronously.
Each module effect is following:
Ultra-wideband antenna module 1: receive impulse ultra-wideband signal from wireless channel;
Receiving filter module 2: filtering out-of-band noise and interference;
Pulse generating module 3: produce with the impulse waveform p (t) and the Hilbert transform waveform
thereof of transmitted pulse coupling and give template signal generating module 4;
Template signal generating module 4:, utilize impulse waveform p (t), the local correlator reception of
generation template m (t),
to give multipath component trapping module 8 respectively according to the modulation system and the multi-access mode that adopt;
Synchronous circuit module 5: realize receiver and the time synchronized that receives signal, regularly synchronous, and realize the timing controlled function of other modules;
Channel estimation module 6: estimate the arrival time delay of distinguishable multipath component and estimate the corresponding channel response amplitude of two template signals respectively, estimated result is given multipath component and is selected module 7;
Multipath component is selected module 7: according to channel estimation results and complexity requirement; Select M multipath component; Each multipath component comprises template type, arrives time delay, channel response amplitude 3 partial informations; Wherein template type, arrival time delay are given multipath component trapping module 8, and the channel response amplitude is given multipath component and merged module 9;
Multipath component trapping module 8: comprise M parallel capture component, each branch comprises a template selector switch, an adjustable delay unit, a correlator, is used to catch a multipath component.Corresponding certain multipath component that is chosen of each branch is selected the template corresponding signal and regulates delay value and multipath that to arrive time delay consistent with the local template of correlator, and receives signal and carries out related operation, and correlator is exported and promptly caught the result;
Multipath component merges module 9: M the multipath component of catching carried out high specific merge (MRC) or equal gain combining (EGC), be made up of M parallel input branch and 1 sum unit.Each input branch comprises a sampling switch and a multiplier, and input variable sampled value and respective channels weighted factor are multiplied each other.M multipath component caught result's call sign judgment variables after weighted sum;
Symbol judgement module 10: according to the modulation system and the corresponding decision rule restore data symbol of system's employing.
Method of the present invention is: receiving terminal adopts a pulse signal p (t) who matees with transmitted pulse as the basic pulse signal; Getting its Hilbert transform obtains another basic pulse signal with same frequency spectrum composition
the two satisfies orthogonality relation: according to the modulation system and the multi-access mode that adopt; Utilize the local template signal m (t) of two basic pulse signal configuration, two local template signals of
gained also to satisfy orthogonality relation respectively, this method of reseptance comprises following steps:
1) modulated signal that sends according to transmitter, by data householder method or blind estimating method, receiver estimates the corresponding multipath channel information of two template signals respectively; Ultra-wideband pulse and complexity constraint according to adopting are confirmed certain acceptable multi-path resolved rate, and then confirm that all distinguishable multipaths arrive time delay τ
1, τ
2..., τ
L, any multipath is arrived time delay τ
i, estimate respectively said two mutually orthogonal local template m (t),
Corresponding channel gain h
i,
Be the projection of estimating received signal at multipath due in to two a local template signal.
2) receiver is selected the multipath component of some according to the complexity requirement, as the object of follow-up branch set and processing; With local template m (t),
All corresponding multipath components are regarded independently alternative multipath component as, according to the trappable multipath quantity M of system, select wherein the channel gain amplitude (| h
i|,
) M maximum multipath component, and corresponding arrival time delay, channel gain and the template of each multipath component of selecting of mark, i.e. (τ
i, h
iOr
M (t) or
); Or select M to arrive the minimum multipath component of time delay.
3) receiver is according to step 2) selected multipath component; Based on local biorthogonal template, utilize correlator to catch and receive multipath component in the signal, integrating step 1) channel information that obtains; The correlator output variable is carried out high specific merge or equal gain combining, obtain the data symbol judgment variables; Configuration M multipath searching branch circuit and 1 weighted sum circuit in the receiver is according to step 2) selection result, regulate delayer in each branch circuit make its aim at certain selected multipath component and select correspondence template signal m (t) or
Utilizing correlator and reception signal to carry out related operation completion multipath component catches; M branch circuit correlator output is synchronized sampling, carries out weighted sum then and obtains the data symbol judgment variables, accomplishes rake and merges; When adopting high specific to merge, weighted factor is got corresponding multipath channel gain h
iOr
When adopting equal gain combining, weighted factor is got corresponding multipath channel gain h
iOr
Polarity, promptly+1 or-1.
4) receiver is adjudicated the data symbol judgment variables that step 3) obtains according to decision rule, restore data information.According to modulation system and the decision rule that system adopts, according to decision threshold the data symbol judgment variables that step 3) obtains is adjudicated, recover the transmitting terminal data symbol.
Fig. 2 a, Fig. 2 b, Fig. 2 c, Fig. 2 d are that example provides basic pulse waveform and orthogonal template waveform sketch map with binary system pulse-position modulation (2-PPM).With ultra broadband transmitted pulse 15 rank Gaussian pulses (shown in Fig. 2 a) is example, and wherein the 2b pulse is the Hilbert transform of 2a pulse, and the two is mutually orthogonal.2c, 2d are the orthogonal dual-mode partitioned signals of this binary system pulse-position modulation radio ultra wide band system.Wherein 2c is the result of the linear conversion of 2a pulse signal, and 2d is the result of the linear conversion of 2b pulse signal, so two template signal 2c, and 2d two pulse signals have the same frequency spectrum composition, and mutually orthogonal.
Fig. 3 is that example has provided the present invention and proposes the bit error rate performance (2 footpaths, 4 footpaths, 8 footpaths) of method of reseptance under the IEEE802.15.3a standard channel CM1 with binary system pulse-position modulation (2-PPM).From figure, can get, along with the increase of selecting multipath number, the performance error code of system constantly reduces, and tends to be steady gradually.Wherein the multi-path selecting method of Fig. 3 employing is: select 2,4,8 maximum multipaths of channel gain; The multipath merging method that adopts is: high specific merges.
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| CN109814072B (en) * | 2019-03-18 | 2024-05-14 | 上海志良电子科技有限公司 | Radar signal processing method and device based on digital receiver |
| CN115580317B (en) * | 2022-12-09 | 2023-03-07 | 长沙驰芯半导体科技有限公司 | Ultra-wideband synchronization capture method and device |
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