CN1795623A - Diversity receiver and diversity reception method - Google Patents
Diversity receiver and diversity reception method Download PDFInfo
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- CN1795623A CN1795623A CN200480014198.3A CN200480014198A CN1795623A CN 1795623 A CN1795623 A CN 1795623A CN 200480014198 A CN200480014198 A CN 200480014198A CN 1795623 A CN1795623 A CN 1795623A
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/084—Equal gain combining, only phase adjustments
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Abstract
Conventionally, when the envelope level of a reception signal fluctuates greatly, gain control should be performed over a wide dynamic range so that weighting can be performed in proportion to the envelope level of the reception signal. In this invention, reference value generation means generates a normalization reference value for normalizing the envelope level from at least one reception signal and normalization means normalizes the envelope level by the normalization reference value.
Description
Technical field
The present invention relates to diversity receiver and diversity receiving method in a kind of mobile body communication system field.
Background technology
The diversity receiver of existing communication for example is documented in the document " mobile communicating basis " (village difficult to understand is kind for a long time, the flourishing chief editor of doctorate, society of electronic information communication association corona (corona) 1986) (non-patent literature 1).Below, use accompanying drawing to carry out the explanation of prior art.
The structure of existing diversity receiver is described with reference to Figure 11.Figure 11 represents that branches is an example of 2 high specific synthetic method.
In Figure 11, the 10, the 11st, antenna, the 100, the 101st, bandlimiting filter, the 110, the 111st, envelope detecting unit, the 120, the 121st, phase detection unit, the 130, the 131st, phase-shifting unit, the 300, the 301st, weighting processing unit, the 400th, demodulating unit.
Below, use Figure 11 that the action of above-mentioned existing diversity receiver is described.In Figure 11, the received signal that antenna 10,11 is received outputs to bandlimiting filter 100,101, is used for the Filtering Processing of reducing noise power.The output of above-mentioned bandlimiting filter 100,101 is input to envelope detecting unit 110,111, detects the envelope level of the received signal of each branch.In addition, also the received signal behind the above-mentioned limit band is outputed to phase detection unit 120,121, in phase detection unit 120,121, from the received signal of each branch, detect phase place, and output to phase-shifting unit 130,131.In above-mentioned phase-shifting unit 130,131, based on above-mentioned detected phase place, make each received signal phase shift to predetermined phase place, output to weighting processing unit 300,301 as same-phase then.In weighting processing unit 300,301, carry out the weighting that is directly proportional with the envelope level of received signal.That is, be weighted according to the envelope level of each branch, make the contribution of the big more branch of envelope level when synthetic big more, on the contrary, the contribution of branch when synthetic that the envelope level is more little is more little.The output of above-mentioned weighting processing unit 300,301 is outputed to demodulating unit 400, after synthesizing, carry out detection, the output demodulation result.
Under the situation of mobile communicating, the building around being subjected to or the influence of landform, electric wave reflects, diffraction, scattering, arrives mobile radio station and phase mutual interference via the ripple (multipath ripple) of a plurality of transfer paths, thereby produces the decay that receives wave amplitude and phase place random fluctuation.
In the transfer path that produces decay, because the envelope level variation of received signal is bigger, thus when weighted, must in the dynamic range of broad, carry out gain controlling, with the weighting of carrying out being directly proportional with the envelope level of received signal.Therefore, the problem that has circuit complexity, realization difficulty.
Non-patent literature 1: " mobile communicating basis " (village difficult to understand is kind for a long time, the flourishing chief editor's electronic information communication of doctorate association's corona (corona) society 1986)
Summary of the invention
The present invention makes for addressing the above problem, and its purpose is to provide a kind of diversity receiver, even under the big situation of the envelope level variation of received signal, does not also need wide dynamic range in the gain controlling that weighted is used.
Diversity receiver of the present invention obtains restituted signal according to the received signal of a plurality of antennas, have envelope level detection unit, fiducial value generation unit, Standardisation Cell, weighting processing unit and demodulating unit, wherein, the envelope level detection unit detects envelope level separately from the received signal of each antenna; The fiducial value generation unit is according at least 1 in above-mentioned each received signal, generates the standardized benchmark value as the fiducial value that is used to make above-mentioned each envelope level standardization; Standardisation Cell utilizes above-mentioned standardized benchmark value to make above-mentioned each envelope level standardization, exports as standardization envelope level respectively; Weighting processing unit, is exported as the weighting received signal respectively being weighted with the corresponding received signal of this standardization envelope level according to above-mentioned standardization envelope level; And demodulating unit is the demodulating unit that the demodulating unit input signal is synthesized back output restituted signal, is the demodulating unit input signal with above-mentioned each weighting received signal.
Description of drawings
Fig. 1 is the structure chart of the diversity receiver of embodiment of the present invention 1.
Fig. 2 is the figure of the structure example of the filter cell among expression the present invention.
Fig. 3 is the figure of the change of the envelope level among expression the present invention.
Fig. 4 is the figure of the action of example of the desirable transmitted power of expression and filter cell in the diversity receiver and holding unit.
Fig. 5 is the structure chart of the diversity receiver of embodiment of the present invention 2.
Fig. 6 is the structure chart of the diversity receiver of embodiment of the present invention 3.
Fig. 7 is the structure chart that the frequency departure of embodiment of the present invention 3 is inferred the unit.
Fig. 8 is the figure of the filter characteristic of expression embodiment of the present invention 3.
Fig. 9 is the figure of structure of the demodulating unit of expression embodiment of the present invention 3.
Figure 10 is the structure chart of the diversity receiver of other execution modes of the present invention.
Figure 11 is the structure chart of existing diversity receiver.
Embodiment
Execution mode 1
Below, with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 execution mode 1 is described.
Fig. 1 is the diversity receiver of present embodiment.Fig. 2 represents an example of the structure of the filter cell in the diversity receiver.The situation of the envelope level variation of the received signal of 2 branches when Fig. 3 represents to decay.Fig. 4 represents example and the filter cell in the diversity receiver and the action of holding unit of desirable transmitted power.
In Fig. 1,10, the 11st, antenna, the 100, the 101st, bandlimiting filter, the 110, the 111st, envelope detecting unit, 120, the 121st, phase detection unit, 130, the 131st, phase-shifting unit, the 140, the 141st, Standardisation Cell, the 200th, maximum selected cell, the 210th, filter cell, the 220th, holding unit, the 300, the 301st, weighting processing unit, the 400th, demodulating unit.
Below, the action of the diversity receiver of present embodiment is described with Fig. 1.
In Fig. 1, the received signal that antenna 10,11 is received outputs to bandlimiting filter 100, is used for the filter process of reducing noise power.The output of above-mentioned bandlimiting filter 100,101 is input to envelope detecting unit 110,111, detects the envelope level (envelope level detection step) of the received signal of each branch.
In addition, the received signal behind the above-mentioned limit band also outputs to phase detection unit 120,121, in phase detection unit 120,121, detects phase place from the received signal of each branch, and outputs to phase-shifting unit 130,131.In above-mentioned phase-shifting unit 130,131, based on above-mentioned detected phase place, make each received signal be displaced to predetermined phase place, output to weighting processing unit 300,301 as same-phase then.
On the other hand, the output with envelope detecting unit 110,111 is input to maximum selected cell 200.The action of maximum selected cell 200 is described with Fig. 3.The envelope level of each branch that Fig. 3 is imported when representing the diversity of 2 branches and the output of maximum selected cell.
In Fig. 3, the 20th, the output of envelope detecting unit 110, the 21st, the output of envelope detecting unit 111.The 22nd, the output of maximum selected cell 200.In maximum selected cell 200, select envelope level (largest enveloping line level) (largest enveloping line level detection step) output, the central maximum of diversity branch several envelope level as the envelope detecting unit of being imported 110,111, to be input to filter cell 210 as the largest enveloping line level of the output of described maximum selected cell 200, carry out Filtering Processing, to suppress the variance components of described largest enveloping line level.An example of the structure of expression filter cell 210 among Fig. 2.
In Fig. 2, the 211st, multiply by the multiplier of gain alpha (α＜1), the 212nd, adder, the 213rd, have the delayer of predetermined certain time of delay of T, the 214th, multiply by the multiplier of gain 1-α.
Below, the action of filter cell 210 is described.
The output of maximum selected cell 200 is input to multiplier 211, multiply by gain alpha.The output of described multiplier 211 is input to adder 212, with the output addition of multiplier 214.Addition result with 212 is input to holding unit 220 as the output of filter cell 210.And, the output of filter cell 210 is input to delayer 213, postpone certain time of delay of T after, be input to multiplier 214, multiply by gain 1-α.
And, in Fig. 1, the output of filter 210 is input to holding unit 220.Carry out Filtering Processing in holding unit 220, the processing of the output change of rejects trap 210 is carried out in the output that the control signal of sending according to illustrated controller never keeps filter 210 then.
Below, the maintenance processing method of holding unit 220 is described.
At first, the such pulse signal of TDMA shown in Fig. 4 (a) is assumed to be the transmission signal that sends to antenna 10 or 11.Because the beginning part signal level in pulse sharply rises, so the output of filter cell 210 produces bigger indicial response at the rising part shown in Fig. 4 (b).This is because corresponding to the rapid rising of the signal level of segment pulse, in order to be followed the output of filter export target value as early as possible, can't increase filter cell 210 time constant caused.As a result, shown in Fig. 4 (b), the output of filter cell 210 is also vibration repeatedly after pulse is risen, and is not steady state value.In this case, filter output is vibrated, and the weighting after standardization is with existing vibration component in the signal, thereby separates timing, distorted signals, characteristic degradation in the output that utilizes 400 pairs of weighting processing unit of demodulating unit 300,310.
Therefore, shown in Fig. 4 (c), in holding unit 220, according to the above-mentioned control signal of being imported, by for example beginning through keeping the output of filter 210 to fix (fiducial value generation step) after a certain stipulated time from pulse beginning position.With the maintenance of described holding unit 220 output as all branches shared, be used to make the standardized standardized benchmark signal of envelope signal to be input to Standardisation Cell 140,141.
This holding unit 220 keeps the timing (predetermined timing) of the output of filter 210 can use following method: for example when this diversity receiver is applied to terminal installation, at first repeat sampling with the interval that is shorter than the pulse spacing, determine the timing of pulse by catching known array, value with this moment keeps, and because pulse timing has been determined in next pulse, so keep with the value that begins from pulse to pass through after the stipulated time.
In addition, when this diversity receiver is applied to the base station, because known pulse timing, so can use the method that keeps through the value after the stipulated time to begin from pulse.
And, when the transmission signal that sends to antenna 10 or 11 is continuous signal, need only the output that keeps filter 210 at interval with official hour.
In Standardisation Cell 140,141, according to the output of holding unit 220, make the outputting standardization of envelope detecting unit 110,111, realize the reduction (normalization step) of the dynamic range of envelope level.To be input to weighting processing unit 300,301 by the envelope level after Standardisation Cell 140,141 standardization.In addition, though the remaining departure that the value of departing from objectives (the desirable convergency value of corresponding received power) arranged in described maintenance output, but because the size of departure is very little with respect to the desired value level, so standardization is fairly obvious to the dynamic range reduction effect of the gain controlling amount of weighted.In addition, since will keep output be used as all branches shared, be used for standardized normalized signal, so the envelope level difference between each branch is saved.That is, relevant with necessary envelope level such as high specific are synthetic information is saved.
In weighting processing unit 300,301, corresponding to the envelope level after Standardisation Cell 140,141 standardization (standardization envelope level), the output (received signal after the processing) of phase-shifting unit 130,131 is weighted (weighted step).That is, be weighted according to the envelope level after the standardization of each branch, make the big more contribution of branch when synthetic of envelope level after the standardization big more, on the contrary, the contribution of branch when synthetic that the envelope level is more little is more little.The output (weighting received signal) of above-mentioned weighting processing unit 300,301 is exported to demodulating unit 400 as the demodulating unit input signal, after synthesizing, carry out detection, output restituted signal (demodulation step).As the example of detection mode, comprise synchronous detection, postpone detection etc.
As mentioned above, in the present embodiment, can obtain a kind of diversity receiver, in the transfer path that produces decay, even when the envelope level variation big (for example more than 50db) of received signal, the signal level of the branch by selecting maximum power makes the signal normalization of each branch according to the filtering result, thereby do not need wide dynamic range in the gain controlling that weighted is used.
In mobile body communication system, received signal level is big because of the difference change of communication environment, so except the change of the received signal level in certain communication environment, also must consider because the change of the received signal level that the variation of communication environment causes, for the communication environment of corresponding wide region, must set the big dynamic range that is used for gain controlling in advance.According to present embodiment, utilize the standardized benchmark signal of above-mentioned explanation to make the envelope level standardization of received signal, so can alleviate because communication environment changes the influence of the received signal level change that is caused, thereby can reduce to be used for the dynamic range of gain controlling.Execution mode by other can be obtained this effect too.
And, can obtain a kind of diversity receiver, even the transmission signal is the pulse signal as TDMA, also can be according to beginning through keeping the signal of the output of filter after a certain stipulated time from pulse beginning position, make the signal normalization of each branch, thereby the output can make weighted the time does not produce distortion.
In addition, above-mentioned phase detection unit 120 and phase-shifting unit 130 and phase detection unit 121 and phase-shifting unit 131 form the received signal processing unit among the present invention respectively, and its action forms the received signal treatment step.In addition, the output of phase-shifting unit 130,131 is corresponding to the received signal after handling.
In addition, constitute fiducial value generation unit among the present invention by maximum selected cell 200 in above-mentioned maximum selected cell 200, filter cell 210, the holding unit 220 and holding unit 220 at least.In addition, the output of this fiducial value generation unit or above-mentioned holding unit 220 is standardized benchmark signals, and its value is the standardized benchmark value.
In addition, constitute fiducial value of the present invention by the action of maximum selected cell 200 in the action of above-mentioned maximum selected cell 200, above-mentioned filter cell 210, holding unit 220 and holding unit 220 at least and generate step.
And, in the present invention, for convenience, also the output of above-mentioned bandlimiting filter 100 and the output of phase-shifting unit 13 are called received signal, in addition, for convenience, also the output with above-mentioned filter cell 210 is called largest enveloping line level.
In addition, be depicted as in the above-described embodiment and generate the standardized benchmark value, obtain the peaked example of each envelope level by maximum selected cell 200, but also maximum selected cell 200 can be replaced as the minimum value selected cell, obtain the minimum value of each envelope level, this minimum envelop line level is carried out the processing identical with above-mentioned execution mode, obtain the standardized benchmark value.
And, also can not use a plurality of envelope level, but with 1 envelope level mean value at the appointed time as the standardized benchmark value.In this case, in Fig. 1, maximum selected cell 200, filter cell 210, holding unit 220 and " mean value is calculated the unit " displacement, only this on average calculates the unit with one in the output of envelope level detection unit 110,111 input.
And, replace 1 envelope level, also can establish 1 received signal mean value at the appointed time is the standardized benchmark value, in this case, needs only in the output of above-mentioned " mean value is calculated the unit " input bandlimiting filter 100,101.
The generation method of standardized benchmark value is not limited to said method, as long as the standardized benchmark value is to generate (deriving from least 1 received signal) according at least 1 received signal, just can suitably select.
Execution mode 2
Present embodiment illustrates carries out the diversity receiver that synthesizes after the detection different with the execution mode 1 of the maximum selected cell of application implementation mode 1, filter cell, holding unit.
Fig. 5 represents the structure of the diversity receiver in the present embodiment.
In Fig. 5,10, the 11st, antenna, the 100, the 101st, bandlimiting filter, the 110, the 111st, envelope detecting unit, 120, the 121st, phase detection unit, 132, the 133rd, phase amplitude converter unit, the 140, the 141st, Standardisation Cell, the 200th, maximum selected cell, the 210th, filter cell, the 220th, holding unit, the 300, the 301st, weighting processing unit, the 400th, demodulating unit.
Below, utilize Fig. 5 that the action of the diversity receiver of the present embodiment different with execution mode 1 is described.
In Fig. 5, the received signal that antenna 10,11 is received outputs to bandlimiting filter 100,101, carries out the Filtering Processing that is used to reduce noise power.The output of above-mentioned bandlimiting filter 100,101 is input to envelope detecting unit 110,111, detects the envelope level of the received signal of each branch.
In addition, the received signal after the above-mentioned frequency band limits also is input to phase detection unit 120,121, detects phase place by phase detection unit 120,121 from the received signal of each branch, outputs to phase amplitude converter unit 132,133.Above-mentioned phase amplitude converter unit 132,133 is based on above-mentioned detected phase place, and phse conversion is become to have the signal of the same phase constituent orthogonal component of predetermined certain amplitude, outputs to weighting processing unit 300,301.
This phase detection unit 120 forms received signal processing unit of the present invention with phase shift amplitude converter unit 132 and phase detection unit 121 respectively with phase shift amplitude converter unit 133, and the output of phase shift amplitude converter unit 132,133 is corresponding to the received signal after handling.
Weighting processing unit 300,301 is similarly carried out and the weighting that is directly proportional by the envelope level after Standardisation Cell 140,141 standardization with execution mode 1.Promptly, according to the envelope level after the standardization of each branch, weighting is carried out in the output of phase amplitude converter unit 132,133, make the big more contribution of branch when synthetic of envelope level after the standardization big more, on the contrary, make the contribution of the more little branch of envelope level when synthetic more little.The output of above-mentioned weighting processing unit 300,301 is outputed to demodulating unit 400,, carry out delay detection or synchronous detection for making the phase place homophase of each branch, after the signal after the described detection is synthesized, the output demodulation result.
As mentioned above, can obtain a kind of diversity receiver in the present embodiment, even in the transfer path that produces decay, under the big situation of the envelope level variation of received signal, the signal level of the branch by selecting maximum power, and make the signal normalization of each branch according to the result of filtering, can not need wide dynamic range during with gain controlling in weighted, and after detection, carry out the synthetic of received signal.
Execution mode 3
Present embodiment is illustrated in and has added synthetic diversity receiver after detections frequency departure compensating unit and band compensation filter cell, that execution and execution mode 2 are different in the execution mode 2.
Fig. 6 represents the structure of the diversity receiver of present embodiment.
In Fig. 6,10, the 11st, antenna, 100, the 101st, bandlimiting filter, 110, the 111st, the envelope detecting unit, 120, the 121st, phase detection unit, 132, the 133rd, phase amplitude converter unit, the 140, the 144th, Standardisation Cell, the 200th, maximum selected cell, the 210th, filter cell, the 220th, holding unit, the 300, the 301st, weighting processing unit, the 310th, frequency departure compensating unit, the 400th, demodulating unit, the 410th, frequency departure is inferred the unit, and the 420, the 421st, complex multiplication unit, the 430, the 431st, band compensation filter.
Fig. 7 represents that the frequency departure of the diversity receiver of present embodiment infers the structure of unit 410.
In Fig. 7, the 411, the 412nd, delayer, the 413, the 414th, complex conjugate is calculated the unit, and the 415, the 416th, complex algorithm unit, the 417th, adder, the 418th, filter cell.
Fig. 8 represents the example of frequency-gain characteristic of ideal filter (for example the special nyquist filter in Shandong (Root Nyquist filter) etc.), bandlimiting filter and the band compensation filter of present embodiment.
In Fig. 8, the 400th, the frequency-gain characteristic of ideal filter.The 441st, the frequency-gain characteristic of bandlimiting filter.The 442nd, the frequency-gain characteristic of band compensation filter.Frequency-the gain characteristic 442 of band compensation filter is configured to, be connected in series bandlimiting filter 100 or 101 and the frequency-gain characteristic of band compensation filter 430 or 431 o'clock be the frequency-gain characteristic of ideal filter.
Below, utilize Fig. 6, Fig. 7, Fig. 8 only to illustrate to relate to the action of the part different with execution mode 2.
The output of weighting processing unit 300,301 is input to frequency departure infers unit 410, carry out inferring of frequency departure.Here, utilize Fig. 7 to illustrate that frequency departure infers the action of unit 410.
From weighting processing unit 300,301 output, comprise frequency departure respectively from the signal (weighting received signal) of each branch, if not compensation in advance before by the band compensation filter (remove or alleviate) frequency departure then is difficult to give full play to the effect of band compensation filter.Here, at first infer the signal of unit and carry out the detection of the frequency departure of each branch, remove noise contribution, carry out inferring of frequency departure then by filter to being input to frequency departure.
At first, branch into the detection method that example illustrates frequency departure with the 1st.
Postpone the signal of the branch of predetermined amount of delay (for example postponing 1 symbol) by delayer 411, calculated unit 413 by complex conjugate and calculate multiple conjugate value, be input to complex multiplication unit 415.The output of complex multiplication unit 415,416 is testing results (individual frequencies deviation signal) of the frequency departure of each branch.The output of complex multiplication unit 415,416 is imported into multiplier 417, carries out the synthetic processing of a plurality of branches, and the signal that improves the signal relevant with the frequency departure testing result is to noise power.The output of adder 417 is input to filter 418.In filter 418, the frequency departure testing result of being imported is carried out Filtering Processing, obtain the repressed frequency departure offset of noise contribution and infer result's (the frequency departure offset is inferred signal).The frequency departure offset is inferred the result be input to complex multiplication unit 420,421, by carrying out complex multiplication with the output of weighting processing unit 300,301, output has compensated the signal (the weighting received signal after the frequency departure compensation) of each branch of frequency departure.
Band compensation filter 430,431 is imported in the output of the complex multiplication unit 420,421 that each branch is obtained respectively, compensates processing, with the frequency-gain characteristic near ideal filter.An example of Chu Liing can be realized with the characteristic with Fig. 8 (b) by branch (tap) coefficient of setting the FIR filter by way of compensation.The output of band compensation filter 430,431 is input to demodulating unit 400.Demodulating unit 400 postpones detection or synchronous detection for the phase place homophase that makes each branch, after the signal after the described detection is synthesized, and the output demodulation result.
By above-mentioned delayer 411, complex conjugate calculate unit 413, complex multiplication unit 415 forms frequency departure detecting unit of the present invention, forms synthesis unit of the present invention by adder 417 and filter 418.In addition, complex multiplication unit 420 is the frequency departure compensation operation unit among the present invention.
In addition, in the present invention, for convenience, also the output of above-mentioned band compensation filter 430,431 is called the weighting received signal after the frequency departure compensation sometimes.
As mentioned above, can obtain a kind of diversity receiver in the present embodiment, even in the transfer path that produces decay, under the big situation of the envelope level variation of received signal, the signal level of the branch by selecting maximum power, and the result who utilizes filtering makes the signal normalization of each branch, can not need wide dynamic range when the gain controlling that weighted is used, and carries out the synthetic of received signal after detection.
As mentioned above, can obtain a kind of diversity receiver in the present embodiment, when diversity reception, exist under the situation of frequency shift (FS), when the frequency departure of each branch of compensation, use the signal of all branches to infer frequency departure, and utilize this to infer the result and come, thereby can carry out the good data demodulation to each branch's compensating frequency deviation.
And, can obtain a kind of diversity receiver, when using analog filter as bandlimiting filter, because frequency characteristic difference at each branch's median filter of diversity, it or not the desirable filter that is complementary, so the band compensation filter (by shared with bandlimiting filter 100, basically forming the filter of ideal filter) by in each branch of backend configuration can carry out the good data demodulation almost equal with ideal filter.
That is the characteristic after, bandlimiting filter 100 and band compensation make up with filter 430 is moved as ideal filter (near ideal filter).
In addition, if use digital filter, then can further improve characteristic as above-mentioned band compensation filter.
Execution mode 4
Present embodiment illustrates the structure of the demodulating unit of carrying out execution mode 3 and moves synthetic diversity receiver after the different detections.Other structure and action are identical with execution mode 3, so corresponding identical part is omitted explanation.
Fig. 9 represents the structure of demodulating unit 400 of the diversity receiver of present embodiment.
In Fig. 9, the 401st, the serial converter unit, the 402nd, postpone detection unit, the 403rd, the synchronous detection unit, the 404th, utilize the selected cell of selecting signal to select the detection mode.
To be input to the demodulating unit 400 of structure from the signal of each branch that the band compensation filter 430,431 of Fig. 6 is exported with Fig. 9.In demodulating unit 400, at first in serial converter unit 401, respectively the signal from each branch is carried out the serial conversion, be input to delay detection unit 402, synchronous detection unit 403.After described delay detection unit 402, synchronous detection unit 403 carried out detection to the signal of each branch respectively, it was synthetic to carry out branch, thereby realized after the detection synthetic.
Here, under the situation of the pulse signal as time division multiple access connects (TDMA), in pulse beginning, be when introducing midway, can not fully carry out frequency and infer in the frequency departure offset of prime is inferred the filter of unit 410, might residual frequency departure.Therefore, in selected cell 404, carry out the selection of detection mode, so that under the situation of residual frequency departure, the delay detection that use is strong to the frequency departure effect, on the contrary, in can fully carrying out the degree that frequency departure infers, when effluxion, use synchronous detection.Like this, the selection that postpones detection and synchronous detection is carried out to the elapsed time that detection begins based on beginning from the received pulse signal.
For example, infer the relation in the elapsed time that begins from pulse beginning position when the time constant of unit 410 and detection begin determines according to the frequency departure offset, if for example according to from pulse beginning beginning the elapsed time/value that the frequency departure offset is inferred the X that the time constant=X of unit 410 determines then can use the delay detection below setting; If X surpasses setting, then can use synchronous detection.
Corresponding to this selection result, will be input to selected cell 404 by the selection signal of not shown control circuit output.
As mentioned above, can obtain a kind of diversity receiver in the present embodiment, under the situation of the pulse signal as time division multiple access connects (TDMA), can't carry out fully that frequency is inferred and during frequency compensation in pulse beginning, the delay detection that use is strong to the frequency departure effect, in the time can fully carrying out the frequency departure compensation, use synchronous detection, thus the superperformance of the data demodulates deterioration in characteristics that can be inhibited.
In addition, in described execution mode 3, execution mode 4, be illustrated, but also can be applicable to as shown in figure 10 the above diversity receiver of 3 branches with regard to the structure and the action of the diversity receiver of 2 branches.Each inscape of present embodiment and action thereof are identical with execution mode 3 and execution mode 4, so omit explanation.
In addition, if will be as Fig. 1 of execution mode 1 explanation or as Fig. 5 of execution mode 2 explanations or Figure 11 weighting processing unit 300 separately of technical descriptioon as a setting, 301 output is as the input to the frequency departure compensating unit 310 of explanation in execution mode 3, and in frequency compensation filter 430,431 and demodulating unit 400 in carry out the processing identical with execution mode 3, then can carry out the good data demodulation equal with ideal filter, and, under these situations if the structure of demodulating unit 400 is formed as above-mentioned execution mode 4 in the structure of explanation, then can obtain a kind of for can the be inhibited diversity receiver of superperformance of data demodulates deterioration in characteristics of pulse signal.
Utilizability on the industry
The present invention can be applicable to the communication system of the radio communication of received signal level change etc.
Claims (11)
1, a kind of diversity receiver obtains restituted signal from the received signal of a plurality of antennas, it is characterized in that:
Have envelope level detection unit, fiducial value generation unit, Standardisation Cell, weighting processing unit and demodulating unit,
Wherein, the envelope level detection unit detects envelope level separately from the received signal of each antenna;
The fiducial value generation unit is according at least 1 in above-mentioned each received signal, generates the standardized benchmark value as the fiducial value that is used to make above-mentioned each envelope level standardization;
Standardisation Cell utilizes above-mentioned standardized benchmark value to make above-mentioned each envelope level standardization, and exports as standardization envelope level respectively;
Weighting processing unit is according to above-mentioned standardization envelope level, to being weighted with the corresponding received signal of this standardization envelope level, and exports as the weighting received signal respectively;
Demodulating unit is the demodulating unit that the demodulating unit input signal is synthesized back output restituted signal, is the demodulating unit input signal with above-mentioned each weighting received signal.
2, diversity receiver according to claim 1 is characterized in that:
Said reference value generation unit has:
The maximum selected cell selects the maximum in above-mentioned each envelope level to export as largest enveloping line level; With
Holding unit forms the standardized benchmark value by regularly keep above-mentioned largest enveloping line level with regulation.
3, diversity receiver according to claim 1 is characterized in that:
Have the received signal processing unit, be used for compensating at least the phase shift of above-mentioned each received signal, and respectively as the received signal output after handling,
Above-mentioned weighting processing unit is according to above-mentioned standardization envelope level, to the corresponding processing of this standardization envelope level after received signal be weighted, and export as the weighting received signal respectively.
4, diversity receiver according to claim 3 is characterized in that:
Above-mentioned received signal processing unit has:
Phase detection unit is imported above-mentioned received signal, detects the phase place of each received signal of being imported, exports as phase signal then; With
Phase-shifting unit is imported above-mentioned received signal and above-mentioned phase signal, according to the phase signal of being imported, make consistent with the phase place of the phase place of corresponding each received signal of this phase signal and regulation, then as the received signal output after handling.
5, diversity receiver according to claim 3 is characterized in that:
Above-mentioned received signal processing unit has:
Phase detection unit is imported above-mentioned received signal, detects the phase place of each received signal of input, exports as phase signal then; With
The phase amplitude converter unit is imported above-mentioned phase signal, makes the phase place of this phase signal consistent with setting with amplitude, then the received signal after the phase amplitude conversion that is generated is exported as the received signal after handling.
6, diversity receiver according to claim 1 is characterized in that:
Also have the frequency departure compensating unit, be used to compensate the frequency departure of above-mentioned each weighting received signal, the weighting received signal after the frequency departure compensation that output is generated,
Above-mentioned demodulating unit input signal is the weighting received signal after the frequency departure compensation.
7, diversity receiver according to claim 6 is characterized in that, also has:
Bandlimiting filter is the bandlimiting filter of frequency band of the received signal of above-mentioned each antenna of restriction, and its output is imported into above-mentioned envelope level detection unit and above-mentioned received signal processing unit; With
The band compensation filter is that to make the characteristic after the combination of itself and above-mentioned bandlimiting filter be the band compensation filter that ideal filter ground moves, and it is input as the weighting received signal behind the said frequencies deviation compensation, and it is output as above-mentioned demodulating unit input signal.
8, a kind of diversity receiver obtains restituted signal after the received signal of a plurality of antennas synthesized, and it is characterized in that having:
Bandlimiting filter, the frequency band of the received signal of above-mentioned each antenna of restriction;
The envelope level detection unit is imported the output of above-mentioned bandlimiting filter, detects the envelope level of output of the bandlimiting filter of this input;
The received signal processing unit is imported the output of above-mentioned bandlimiting filter, compensates the phase shift of output of the bandlimiting filter of this input at least, and respectively as the received signal output after handling;
Weighting processing unit according to above-mentioned each envelope level, is weighted the received signal after the above-mentioned processing, exports as the weighting received signal respectively;
The frequency departure compensating unit is imported above-mentioned each weighting received signal, compensates the frequency departure that this weighting received signal departs from assigned frequency, respectively as the weighting received signal output after the frequency departure compensation;
The band compensation filter is imported the weighting received signal after above-mentioned each frequency departure compensates, and making the characteristic after itself and above-mentioned bandlimiting filter make up is that ideal filter ground moves; With
Demodulating unit obtains restituted signal after the output of above-mentioned each band compensation filter synthesized.
9, according to claim 6 or 8 described diversity receivers, it is characterized in that the said frequencies deviation compensator has:
The frequency departure detecting unit, the frequency departure of above-mentioned each weighting received signal that detection is imported is exported as the individual frequencies deviation signal respectively;
Synthesis unit synthesizes above-mentioned each individual frequencies deviation signal, infers signal output as the frequency departure offset; With
The frequency departure of the above-mentioned weighting received signal of signal compensation is inferred according to said frequencies deviation compensation value in frequency departure compensation operation unit, generates the weighting received signal after each frequency departure compensation.
10, diversity receiver according to claim 9 is characterized in that:
Above-mentioned demodulating unit has: the synchronous detection unit, in that above-mentioned demodulating unit input signal carries out synthesizing behind the synchronous detection to each respectively; With the delay detection unit, respectively each above-mentioned demodulating unit input signal is postponed to synthesize after the detection,
Wherein, above-mentioned received signal is under the situation of pulse signal, begins elapsed time when detection begins according to the reception from this pulse signal, selects to use above-mentioned synchronous detection unit and above-mentioned delay detection unit.
11, a kind of diversity receiving method obtains restituted signal from the received signal of a plurality of antennas, have:
Envelope level detection step detects the envelope level of the received signal of each antenna;
Fiducial value generates step, according to above-mentioned each envelope level, generates the standardized benchmark value as the fiducial value that is used to make above-mentioned each envelope level standardization;
Normalization step utilizes above-mentioned standardized benchmark value to make above-mentioned each envelope level standardization, and respectively as standardization envelope level;
The weighted step is according to above-mentioned standardization envelope level, to being weighted with corresponding each received signal of this standardization envelope level, respectively as the weighting received signal; With
Demodulation step obtains restituted signal after above-mentioned each weighting received signal synthesized.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2004/005848 WO2005104400A1 (en) | 2004-04-23 | 2004-04-23 | Diversity receiver and diversity reception method |
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| Publication Number | Publication Date |
|---|---|
| CN1795623A true CN1795623A (en) | 2006-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200480014198.3A Pending CN1795623A (en) | 2004-04-23 | 2004-04-23 | Diversity receiver and diversity reception method |
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| Country | Link |
|---|---|
| JP (1) | JPWO2005104400A1 (en) |
| CN (1) | CN1795623A (en) |
| WO (1) | WO2005104400A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104838601A (en) * | 2012-12-07 | 2015-08-12 | 三菱电机株式会社 | Diversity receiver and diversity recep tion method |
| CN105071775A (en) * | 2015-07-06 | 2015-11-18 | 中国电子科技集团公司第二十研究所 | Real-time phase compensation circuit |
| CN108155959A (en) * | 2017-12-15 | 2018-06-12 | 成都爱科特科技发展有限公司 | UAV TT ＆ C's signal detecting method under a kind of complex network environment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102554150B1 (en) | 2016-11-21 | 2023-07-12 | 삼성전자주식회사 | Receiver |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0683283B2 (en) * | 1985-12-09 | 1994-10-19 | 株式会社日立製作所 | Demodulation circuit |
| JP2816917B2 (en) * | 1992-09-14 | 1998-10-27 | エヌ・ティ・ティ移動通信網株式会社 | Wireless receiver |
| JP3022194B2 (en) * | 1994-09-02 | 2000-03-15 | 三菱電機株式会社 | Diversity receiver |
| JP3103014B2 (en) * | 1994-12-22 | 2000-10-23 | 三菱電機株式会社 | Receiving machine |
| JPH1098424A (en) * | 1996-09-20 | 1998-04-14 | Matsushita Electric Ind Co Ltd | Diversity receiver |
| JP2003078462A (en) * | 2001-08-31 | 2003-03-14 | Sanyo Electric Co Ltd | Radio equipment, its signal receiving method, its filter coefficient measuring method and filter coefficient measurement program thereof |
-
2004
- 2004-04-23 JP JP2006519129A patent/JPWO2005104400A1/en not_active Abandoned
- 2004-04-23 WO PCT/JP2004/005848 patent/WO2005104400A1/en active Application Filing
- 2004-04-23 CN CN200480014198.3A patent/CN1795623A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104838601A (en) * | 2012-12-07 | 2015-08-12 | 三菱电机株式会社 | Diversity receiver and diversity recep tion method |
| CN104838601B (en) * | 2012-12-07 | 2018-05-01 | 三菱电机株式会社 | Diversity receiving device and diversity receiving method |
| CN105071775A (en) * | 2015-07-06 | 2015-11-18 | 中国电子科技集团公司第二十研究所 | Real-time phase compensation circuit |
| CN105071775B (en) * | 2015-07-06 | 2018-03-23 | 中国电子科技集团公司第二十研究所 | A kind of automatic phase compensation circuit in real time |
| CN108155959A (en) * | 2017-12-15 | 2018-06-12 | 成都爱科特科技发展有限公司 | UAV TT ＆ C's signal detecting method under a kind of complex network environment |
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| Publication number | Publication date |
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| JPWO2005104400A1 (en) | 2007-08-30 |
| WO2005104400A1 (en) | 2005-11-03 |
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