CN1497867A - Diversity receiver and diversity receiving method - Google Patents
Diversity receiver and diversity receiving method Download PDFInfo
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- CN1497867A CN1497867A CNA2003101006492A CN200310100649A CN1497867A CN 1497867 A CN1497867 A CN 1497867A CN A2003101006492 A CNA2003101006492 A CN A2003101006492A CN 200310100649 A CN200310100649 A CN 200310100649A CN 1497867 A CN1497867 A CN 1497867A
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Abstract
In a diversity receiver comprising an AGC section for controlling the gain of a tuner, an equalizer equalizes an outputted signal from a fast Fourier transformer. A reliability calculator calculates the reliability value of each of carriers by an equalized pilot signal obtained from the equalizer. A reliability value corrector corrects the reliability value by outputted information from the AGC section. A carrier selecting/combining section performs one of selecting and weighting combining for the carrier in a branch in accordance with the corrected reliability value. When a Viterbi decoder is provided, the Viterbi decoder weights an output from the carrier selecting/combining section with a new reliability value to perform maximum likelihood decoding. It is possible to prevent a reliability value which does not reflect an actually received power from being calculated as a result of increasing a power by an AGC in spatial diversity for every OFDM or FDM demodulated carrier. Even in the case of mobile reception, data with high reliability can be decoded.
Description
Technical field
The present invention relates to use the diversity receiving device and the diversity receiving method of the signal of the shunt reception frequency division multiplex (FDM) more than 2.
Background technology
In Japan, the service that is predefined in 2003 later stage begins digital terrestrial television.As the modulation system in the standard of this digital terrestrial television (ISDB-T), adopt Orthodoxy Frequency Division Multiplex (OFDM).OFDM modulates mutually orthogonal a plurality of carrier waves in the numerical data that will transmit, and multiplexed these modulating waves carry out transmission manner.In the OFDM transmission signals, be provided with and duplicated the guard period that sends the part of waveform.Even there is the following multipath effect of guard period for this reason, also can prevent the deterioration of receiving quality.
But the OFDM receiving system of institute's motion up to now, but can not be fully corresponding deterioration at the receiving feature that moves the Doppler shift that produces when receiving and cause because of the influence of time decay.Generally, the improvement method as the receiving feature under environment that abominable multiplexed electric wave is propagated and the mobile environment that receives has diversity receiving method.
In addition, as the communication environments of ground surface, cause the deterioration of receiving features such as multipath effect and decay easily.For this reason, in ISDB-T, with the code that is connected of convolutional code and Reed Suo Luomeng code, also adopt time-interleaved etc., to improve anti-mistake.
But because from the transfer phase of analog broadcasting to digital broadcasting, the utilization of frequency mixes more, anticipation will be subjected to the influence from the interference of analog broadcasting ripple, so-called same channel disturbance and adjacent channel interference etc.In order to alleviate the influence of this interference, the reliability value that proposes the carrier wave that will be interfered is set method that 0 carrier wave disappears for and is carried out the method for soft decision Veterbi decoding etc. according to the degree of disturbing based on the reliability of this carrier wave.
As diversity receiving method, in analog television broadcast in the past, from wireless frequency (RF) signal that receives by a plurality of reception antennas, select power to become maximum reception antenna the method that signal carries out demodulation is accounted for main flow.The method is called the antenna switched diversity.
With respect to this, in the digital television broadcasting of using the OFDM transmission means, except that antenna switched diversity in the past, can also use carrier diversity so that the carrier wave unit of ofdm signal is selected or weighting is synthetic.Carrier diversity is provided with a plurality of antennas, in shunt separately carrier wave is carried out demodulation respectively.Then about having carried out the carrier wave of demodulation respectively, with its power etc. as benchmark, carry out select or weighting synthetic etc.As everyone knows, such carrier diversity ratio antenna switched diversity is brought into play bigger effect.This example is opened in the 2001-156738 communique the Japanese Patent Application Publication spy and is disclosed.
Reliability value, the average power by utilizing the dispersion payload signal of periodically inserting (SP signal) between the data carrier of ofdm signal etc. just can be calculated.Such reliability value can at Veterbi decoding and be divided to concentrate commonly and be used.
In Veterbi decoding, when the bit column of in the Veterbi decoding unit, importing continuously and be judged as under the low situation of reliability, can not correctly decode, will carry out error correcting.For this reason, this reliability value, even low as the power of continuous reception data, but the reliability that has to a certain degree is calculated as.
On the other hand, concentrate at the branch of each carrier wave and since between a plurality of shunt of uncorrelated change, carry out carrier wave relatively or synthetic, reflect the absolute power that receives so wish reliability value.
But, above-mentioned situation of carrying out the diversity of each carrier wave, according to accepting state, receiving feature also will worsen when using the carrier diversity ratio not use carrier diversity sometimes.For example, consider in the reception of the carrier diversity of forming by two antennas that the accepting state in antenna worsens the situation that another accepting state is good very much.In the case, the reception of having carried out carrier diversity receives with the good antenna of accepting state than only, and receiving feature is also wanted deterioration.When the accepting state between two antennas produces difference more than the certain value in addition, carry out carrier diversity once the side in receiving feature with deterioration.
Above-mentioned state is mainly considered following situation as reason.Concentrate at the branch of each carrier wave, the carrier power behind the FFT etc. is calculated its reliability value, and selection or the weighting of carrying out signal according to reliability value are synthetic.But, for example in tuner A, the B of two shunt, under the situation of the little state continuance of the received power of shunt B, just carry out increasing of power by AGC (automatic gain controller).For this reason, in this shunt, should calculate low reliability value part originally, will calculate high reliability value.
,, can receive, but under the situation of the carrier wave that original received power is little in the opposing party's shunt B, when utilizing the synthetic execution of selection or weighting carrier diversity, receiving feature worsens on the contrary even received power is big in the tuner A a side no problemly for this reason.
Therefore to the problems referred to above point, with reference to Fig. 1 on one side the function of in the past OFDM diversity receiving device particularly discussed on one side.OFDM diversity receiving device shown in Figure 1 receives ofdm signal respectively in two antenna series (along separate routes), carry out diversity about the carrier wave that has carried out demodulation.
Ofdm signal the 101, the 102nd arrives the signal of antenna 103,104 respectively.Tuner 105,106 carries out channel selection.Automatic gain controller (AGC) 107,108 is controlled the gain of tuner 105,106 based on the output of orthogonal detection unit (DET) 111,112 respectively, and output amplitude is controlled to certain limit.AGC107,108 makes the gain of tuner increase under the little situation of received power, otherwise the gain of tuner is reduced.
Analog/digital converter (ADC) 109,110 will be transformed into digital signal from the analog signal of tuner 105,106 outputs respectively.Quadrature demodulation is carried out in 111, the 112 couples of ADC109 in orthogonal detection unit (DET), 110 output, and is transformed into complex signal.
113,114 pairs of each ofdm signals that receive through antenna 103,104 of Fourier transform unit (FFT) become the signal of frequency axis from the signal transformation of time shaft.Carrier wave behind the FFT comprises, the dispersion payload signal that comprises the data carrier of common data and insert at regular intervals (below be called the SP signal).
Balanced unit 115,116 uses the SP signal to infer each transmission line property along separate routes.Balanced unit 115 constitutes as Fig. 2 A.Balanced unit 116 constitutes as Fig. 2 B in addition.At receiver side complex division unit 115a, 116a the SP signal that receives is carried out the complex division computing with known SP signal for this reason, just can obtain the transmission line property of SP signal location thus.Interpolating unit 115b, 116b carry out interpolation to resulting transmission line property on time-axis direction and frequency axis direction, obtain the transmission line property in the signal location of whole carrier waves thus.Complex division unit 115c, 116c use the transmission line property of being obtained by interpolating unit 115b, 116b that data carrier is carried out the complex division computing, come thus carrier wave is carried out equilibrium.
In Fig. 1, transmission line property 117 and carrier wave 119 in the series (shunt 1) of balanced unit 115 output antennas 103.Transmission line property 118 and carrier wave 120 in the series (shunt 2) of balanced unit 116 output antennas 104.
Power calculation unit (P calculating) 121,122 is used the power that calculates the transmission line property of each carrier wave respectively from the transmission line property of balanced unit 115,116 outputs.Then average power is calculated unit (Pa calculatings) 123,124, serves as that the basis is to totally on average carrying out computing calculates average power with the power of this transmission line property that calculates.This average power just becomes the fiducial value of the reliability value of calculating each carrier wave.
Calculation of Reliability unit (R calculating) 125,126 as the reliability value of each carrier wave, carries out division arithmetic to the power of the transmission line property of each carrier wave and obtains with average power.Calculation of Reliability unit 125,126 as benchmark and set threshold value arbitrarily, and compares the computed reliability value with the power and the threshold value of the transmission line property of each carrier wave with average power in addition.
The computational methods of the reliability value R of the power of transmission line property by more above-mentioned threshold value and each carrier wave shown in Fig. 3.In Fig. 3, the 202nd, become the average power of the benchmark of threshold value, threshold value 1,2,3 is based on the threshold value that average power sets.Not enough threshold value 1 is that reliability value R is 1 in Fig. 3, and threshold value 1 above less than 2 is that reliability value R is 2, and threshold value 2 above less thaies 3 are that reliability value R is 3, and threshold value is that reliability value R is 4 more than 3.Here establish high-power side's reliability value height.
Fig. 3 illustrates the value of the transmission line property power of each carrier wave 206,207,208,209.Each such power and threshold value are compared computed reliability value R.For example to calculate reliability value R be 4 to carrier wave 206, and it is 3,2,1 that carrier wave 207,208,209 calculates reliability value respectively.In the Calculation of Reliability unit 125,126 of Fig. 1, computed reliability value as described above, and output to carrier selecting (C selects synthesis unit) 127.Balanced unit 115,116 outputs to carrier selecting 127 with carrier wave 119,120 in addition.
Carrier selecting 127 to the shunt imported 1 and 2 carrier wave along separate routes, serves as that the high carrier wave of reliability value is selected on the basis with its reliability value, perhaps is weighted synthetic according to reliability value.The carrier wave that 128 pairs of error correcting unit have carried out these processing carries out error correcting
Then use Fig. 4 that other problem that produces in the diversity receiving device of conventional example is described.In Fig. 4, to having and the additional identical numbering of the piece of Fig. 1 identical function.The received power of ofdm signal changes because of various essential factors.Though the reception good in the shunt 1 is also arranged sometimes, the situation that the reception in the shunt 2 worsens.State is in contrast to this also arranged in addition.
The frequency spectrum of the received power in the 301 expression shunt 1 has enough power in the case.On the other hand, the frequency spectrum of the received power in the 302 expression shunt 2, received power is little.Even but under the little situation of received power, if in the following range of AGC power also increase, therefore it is big just to be judged as power in the moment of computed reliability value.In the frequency spectrum shown in 303,304, be applicable to this condition.For this reason,, calculate the reliability value height, just the problem of Calculation of Reliability of not reflecting actual received power and so on is arranged although original received power is little.
Problem points when using Fig. 5 and Fig. 6 that above-mentioned reliability value calculating is described.401 expressions of Fig. 5 are along separate routes during the reception in 1 and the state of the carrier wave during demodulation process.402 expressions of Fig. 6 are along separate routes during the reception in 2 and the state of the carrier wave during demodulation process.Accepting state on the antenna in the 403 expression shunt 1 of Fig. 5, the received power 405 of carrier wave 406～409 is big.Because received power is big, so there be not increasing of AGC like that shown in 404, for the reliability value result of calculation 414～417 of the carrier wave in the Calculation of Reliability unit 125 406～409, is reflected with regard to making the received power on the antenna.
On the other hand, the received power on the antenna in Fig. 6 in the 418 expression shunt 2, received power 420 is little.But for the reliability value result of calculation 429～432 of carrier wave 421～424, increase, just become high value because of AGC power.Thus, in carrier wave, just produce the contradiction that calculates reliability value identical and so on shunt 1 compared with the shunt 2 that along separate routes 1 received power is also very little.
If according to the reliability value of utilizing such processing, then as the shunt with uniform reliability value, the carrier wave of 1 carrier wave and shunt 2 synthesizes with equal ratio along separate routes, just produces the problem that but worsens by diversity performance.
Summary of the invention
The invention provides a kind of diversity receiving device, in the space diversity of each carrier wave of FDM demodulation, the result that inhibition is increased because of the power of AGC, and the reliability value that does not reflect actual received power is calculated, even also carry out the selection of the high carrier wave of reliability or synthetic under the state of C/N difference.The AGC unit is controlled the gain of the tuner that receives frequency division multiplex signal on along separate routes at each for this reason, and the AGC value in the output gain control.Detection unit each along separate routes on to carrying out detection by the resulting FDM signal of tuner.The fast Fourier transform unit will carry out conversion from time domain to frequency domain, and output comprise each carrier wave of payload signal by the resulting detection output of detection unit by fast Fourier transform in each shunt.Balanced unit each along separate routes on to using payload signal to carry out equilibrium by resulting each carrier wave in fast Fourier transform unit, and infer the transmission line property of carrier wave.The AGC value that the Calculation of Reliability unit is exported from the payload signal and the AGC unit of balanced unit output in each shunt is calculated the reliability value of each carrier wave.Carrier selecting is according to the reliability value of Calculation of Reliability unit then, and selection or the weighting of each carrier wave being carried out carrier wave are synthetic.
The invention provides a kind of diversity receiving device in addition, be suitable for the calculating of the reliability value of Veterbi decoding and diversity respectively, to improve the performance of diversity reception.For this reason, the fiducial value computing unit each along separate routes on signal power from receiving, obtain the 2nd fiducial value that the 1st fiducial value that diversity uses and Veterbi decoding are used respectively.The 1st Calculation of Reliability unit calculates the 1st used reliability value of diversity from the 1st fiducial value in each shunt.The 2nd Calculation of Reliability unit calculates the 2nd used reliability value of Veterbi decoding from the 2nd fiducial value in each shunt.Carrier selecting is according to each the 1st reliability value along separate routes, and selection or the weighting of carrying out each carrier wave are synthetic.Then the Veterbi decoding unit to the output of carrier selecting according to the 2nd reliability value weighting and carry out the optimal solution sign indicating number.
Description of drawings
Fig. 1 is the block diagram of formation of the diversity receiving device of expression conventional example.
Fig. 2 A is the structure chart of the 1st balanced unit used in the diversity receiving device of conventional example and embodiment and embodiment 1～6.
Fig. 2 B is the structure chart of the 2nd balanced unit used in the diversity receiving device of conventional example and embodiment and embodiment 1～6.
Fig. 3 is illustrated in the diversity receiving device of conventional example the schematic diagram of reliability value computational methods.
Fig. 4 is illustrated in the diversity receiving device of conventional example the schematic diagram of the problem points that the power of AGC is increased.
Fig. 5 is illustrated in the diversity receiving device of conventional example, increases the schematic diagram (its 1) of the problem points of the reliability value calculating that produces owing to the power of AGC.
Fig. 6 is illustrated in the diversity receiving device of conventional example, increases the schematic diagram (its 1) of the problem points of the reliability value calculating that produces owing to the power of AGC.
Fig. 7 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 1.
Fig. 8 is the functional block diagram of the action of the reliability value correction among the expression embodiment 1.
Fig. 9 A is the 1st a used checking list during the reliability value among the expression embodiment 1 is proofreaied and correct.
Fig. 9 B is the 2nd a used checking list during the reliability value among the expression embodiment 1 is proofreaied and correct.
Figure 10 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 2.
Figure 11 is the functional block diagram of the action of the reliability value correction among the expression embodiment 2.
Figure 12 is the block diagram of the structure of the reliability value correcting unit among the expression embodiment 2.
Figure 13 is the block diagram of the structure of the diversity receiving device (its 1) in the expression embodiment of the invention 3.
Figure 14 is the block diagram of the structure of the diversity receiving device (its 2) in the expression embodiment of the invention 3.
Figure 15 is the block diagram of the structure of the diversity receiving device (its 1) in the expression embodiment of the invention 4.
Figure 16 is illustrated in the diversity receiving device of embodiment 4 schematic diagram of C/N Calculation Method.
Figure 17 is the block diagram of the structure of the diversity receiving device (its 2) among the expression embodiment 4.
Figure 18 is the block diagram of the structure of the diversity receiving device (its 3) among the expression embodiment 4.
Figure 19 is the block diagram of the structure of the diversity receiving device (its 4) among the expression embodiment 4.
Figure 20 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 5.
Figure 21 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 6.
Figure 22 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 7.
Figure 23 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 8.
Figure 24 A is the structure chart of the 1st balanced unit used in the diversity receiving device of embodiment 8.
Figure 24 B is the structure chart of the 2nd balanced unit used in the diversity receiving device of embodiment 8.
Figure 25 is the schematic diagram of the operating principle of reliability value computing unit.
Figure 26 is the structure chart that average power used in the diversity receiving device of embodiment 7～8 is calculated the unit.
Figure 27 is the block diagram that is illustrated in the function of carrier selecting used in the diversity receiving device of embodiment 8.
Figure 28 A is the key diagram of the 1st table content of the carrier selecting among the expression embodiment 8.
Figure 28 B is the key diagram of the 2nd table content of the carrier selecting among the expression embodiment 8.
Figure 29 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 9.
Figure 30 is the block diagram of the structure of the diversity receiving device in the expression embodiment of the invention 10.
Figure 31 is the schematic diagram of the function of the reliability value computing unit among the expression embodiment 10.
Embodiment
(embodiment 1)
The structure of the OFDM diversity receiving device in the embodiments of the invention shown in Fig. 71.In addition, in Fig. 7, piece same as shown in Figure 1 is added identical mark.
Ofdm signal the 101, the 102nd arrives the signal of antenna 103,104 respectively.The ofdm signal of special frequency band is received in tuner 105,106 choosings.Automatic gain controller device (AGC) 107,108 is controlled the gain of tuner 105,106 based on the output of orthogonal detection unit (DET) 111,112 respectively, and output amplitude is controlled to certain limit.AGC107,108 makes the gain of tuner increase under the little situation of received power, otherwise the gain of tuner is reduced.
Analog/digital converter (ADC) 109,110 will be transformed into digital signal from the analog signal of tuner 105,106 outputs respectively.Quadrature demodulation is carried out in 111, the 112 couples of ADC109 in orthogonal detection unit (DET), 110 output, and is transformed into complex signal.
113,114 pairs of each ofdm signals that receive through antenna 103,104 of Fourier transform unit (FFT) become the signal of frequency axis from the signal transformation of time shaft.Carrier wave behind the FFT comprises, and comprises the data carrier of common data and the SP signal that inserts at regular intervals.
Balanced unit 115,116 uses the SP signal to infer each transmission line property along separate routes.Power calculation unit (P calculating) 121,122 is used the power that calculates the transmission line property of each carrier wave respectively from the transmission line property of balanced unit 115,116 outputs.Average power is calculated unit (Pa calculatings) 123,124, serves as that the basis is to totally on average carrying out computing calculates average power with the power of this transmission line property that calculates.
Calculation of Reliability unit (R calculating) 125A, 126A use respectively from the payload signal of balanced unit 115,116 outputs and, delayed unit 503,504 is the AGC values of 107,108 outputs from the AGC unit respectively, calculate the reliability value of each carrier wave.Carrier selecting 127 to the shunt imported 1 and 2 carrier wave along separate routes, serves as that the high carrier wave of reliability value is selected on the basis with its reliability value, perhaps is weighted synthetic according to reliability value.Error correcting unit 128 carries out error correcting to the carrier wave that has carried out these processing.In addition, balanced unit 115,116 is with shown in Figure 2 identical.Below, establish as the big side's received power of the AGC value of AGC107,108 output big.
Action to the diversity receiving device of such present embodiment that constitutes describes.In the present embodiment, in order to address the above problem, Calculation of Reliability unit (R calculating) 125A, 126A proofread and correct reliability value based on AGC107,108 output.
The output signal 501 of delay cell 503 is AGC values that are delayed of shunt 1.The output signal 502 of delay cell 504 is AGC values that are delayed of shunt 2.503,504 pairs of delay cells are followed from the time of delay that AGC controls to the signal processing of Calculation of Reliability unit and are supplied.Calculation of Reliability unit 125A, 126A use the AGC value after postponing to carry out the treatment for correcting of reliability value.
Used an example of the reliability value treatment for correcting of AGC output shown in Fig. 8.Calculation of Reliability unit 125A has, and 603,1 reliability value identifying unit 604 of divider, AGC value identifying unit 607 and checking list 609 calculate the reliability value of each carrier wave in the shunt 1, and output to carrier selecting 127.Here divider 603 and 1 reliability value identifying unit 604 are called reliability value computing unit 605, AGC value identifying unit 607 and checking list 609 are called reliability value correcting unit 611.
Calculation of Reliability unit 126A has in addition, and 614,1 reliability value identifying unit 615 of divider, AGC value identifying unit 618 and checking list 620 calculate the reliability value of each carrier wave in the shunt 2, and output to carrier selecting 127.Here also divider 614 and 1 reliability value identifying unit 615 are called reliability value computing unit 616, AGC value identifying unit 618 and checking list 620 are called reliability value correcting unit 622.The content of checking list 609 is shown in Fig. 9 A, and the content of checking list 620 is shown in Fig. 9 B.
It is little to be located at along separate routes in 1 received power here, along separate routes in 2 received power describe greatly.Calculation of Reliability unit 125A imports the performance number 601 of transmission line property of each carrier wave and the average power 602 of this transmission line property.The performance number 601 usefulness average powers 602 of the transmission line property of 603 pairs of each carrier waves of divider are carried out division arithmetic, and the division value is outputed to reliability value identifying unit 604 1 time.1 time reliability value identifying unit 604 has 4 grades of reliability value of 1～4, reliability value is calculated as " 4 " about certain carrier wave in this example.
On the other hand, to Calculation of Reliability unit 125A input AGC value 606,607 classifications of AGC value identifying unit judge whether received power is good.The situation that the AGC value is low is made as " 1 ", and high situation is made as " 2 ".AGC value identifying unit 607 usefulness are judged for 2 grades like this, and the AGC value of being imported 606 is judged to be " 1 " as decision content 608.The value of epimere is the AGC value result of determination of AGC value identifying unit 607 in the checking list shown in Fig. 9 A 609, and the value of left column is 11 reliability decision result in the reliability value identifying unit 604.Like this, 1 reliability decision result is carried out correction.1 reliability decision result is " 4 " in this example because in checking list 609, and AGC value result of determination is " 1 ", so such shown in 610, reliability value is corrected into " 2 ", and this value is used as proofreading and correct reliability value.Because the AGC value is low, accepting state is poor, reliability value is reduced here so proofread and correct.This proofreaies and correct reliability value and is output to carrier selecting 127.
In the opposing party's shunt, also carry out same processing.Like that, the received power in the shunt 2 is good shown in the Calculation of Reliability unit 126A of Fig. 8, and AGC value identifying unit 618 is judged to be " 2 ".Because 1 time the reliability decision result is similarly " 4 " with shunt 1, the AGC result of determination is " 2 ", so reliability value correcting unit 622 is proofreaied and correct according to the checking list 620 shown in Fig. 9 B, exports " 4 " like that as reliability value shown in 621.This proofreaies and correct reliability value and is given carrier selecting 127.
Like this, the result that the power among the AGC is increased is that all temporary transient conduct " 4 " calculates reliability value in any one shunt, and is transformed into the reliability value that has reflected accepting state by the correction of AGC value.In addition, also can use with above-mentioned shown in the different checking list of checking list.In addition, also consider to compare, the reliability value that is judged as the significantly little carrier wave of received power is set as 0 mode that makes its disappearance with predetermined reference value.Also can access same effect with the method.By correction as described above, just can reflect that the reliability value of actual accepting state is calculated, can improve diversity.
In addition, except that using above-mentioned checking list, by removing with the AGC value or taking advantage of 1 reliability decision result's correction also can obtain same effect.In addition, also can not to proofread and correct the reliability value that temporarily calculates, but from transmission line feature power 601 computed reliabilities of average power 602 and each carrier wave the time, use the calculating of AGC value to reflect the reliability value of accepting state.Also can obtain same effect in the case.
According to present embodiment 1, proofread and correct reliability value as described above, calculate and reflected that the reliability value of actual received power just becomes possibility by be output as the basis with AGC.Then by each carrier wave that has used the reliability value after this correction is selected/synthesized, just can carry out the diversity of each carrier wave of the influence of the carrier wave of having got rid of the accepting state difference.
(embodiment 2)
Then the OFDM diversity receiving device in the embodiments of the invention 2 is described.The structure of the OFDM diversity receiving device of embodiment shown in Figure 10 2.Here having the mark also additional identical with the piece of embodiment 1 identical function describes.
The OFDM diversity receiving device of present embodiment, relatively each AGC value is along separate routes carried out the correction that each reliability value is along separate routes calculated.Divide the deterioration in characteristics of concentrating, not only produce under the situation that the received power in a side shunt is significantly low, under the significantly big situation of the relative difference that receives power between two shunt, also produce.Should make the contribution degree of the carrier wave of the low relatively shunt of reception level fall or cut down under these circumstances.
Thereby in the present embodiment also can be corresponding under the significantly big situation of the difference of the received power between above-mentioned shunt in order to make, comparing unit 701 is set.Then, comparative result is given the Calculation of Reliability unit 125B of shunt 1 and the Calculation of Reliability unit 126B of shunt 2.The AGC value of 701 pairs of two shunt of comparing unit of Figure 10 compares, and calculates the difference value of AGC.Then, the difference value and the predetermined threshold value of 701 pairs two AGC values along separate routes of comparing unit compare.Result relatively is if difference value is more than the predetermined threshold value then Calculation of Reliability unit (R calculating) 125B, 126B proofread and correct reliability value, if not enough threshold value then reliability value is not proofreaied and correct.
Shown in Figure 11 about the functional block of the correction of the reliability value of comparing unit 701 and Calculation of Reliability unit 125B, 126B.Comparing unit 701 has Differential Detection unit 802, identifying unit 803.In addition, Calculation of Reliability unit 125B has divider 804 as the reliability value computing unit, has correcting unit 806 as the reliability value correcting unit.Same Calculation of Reliability unit 126B has divider 808 as the reliability value computing unit, has correcting unit 810 as the reliability value correcting unit.
Comparing unit 701 is imported the AGC value from two shunt, and Differential Detection unit 802 calculates the difference value of the AGC value of two shunt.803 pairs of difference values of identifying unit and threshold value 801 compare judgement.Under two along separate routes the situations of the not enough predetermined threshold value 801 of difference value of AGC value, identifying unit 803 is exported the information 702,703 of the correction that does not need reliability value.At difference value is under the situation of predetermined threshold value more than 801, the information that identifying unit 803 will need to proofread and correct and so on, this difference value and output to Calculation of Reliability unit 125B, 126B respectively about the information 702,703 of AGC value height relative between shunt.In Calculation of Reliability unit 125B, 126B, use the above-mentioned information that is transmitted that reliability value is proofreaied and correct.Correcting unit 806,810 difference components according to the AGC value reduce the reliability value of the low relatively shunt of AGC value, and the high relatively shunt of AGC value is kept intact.By being reflected in the reliability value with regard to the difference that makes the AGC value like this.
The functional block of correcting unit shown in Figure 12 806,810.The difference value of reliability value 805 before the correction that correcting unit 806 input is calculated by the divider 804 of Figure 11, the AGC value that gives from comparing unit 701 and about AGC value relative between shunt information 702 just.The difference value of reliability value 809 before the correction that same correcting unit 810 inputs are calculated by the divider 808 of Figure 11, the AGC value that gives from comparing unit 701 and about AGC value relative between shunt information 703 just.Use among checking list 806a, the 810a of this AGC difference value in correcting unit.Use among multiplexer (MUX) 806d, the 810d of height information in correcting unit along separate routes.
Checking list 806a, 810a are used for difference component according to the AGC value, proofread and correct the reliability value that temporarily calculates.Such as shown in the figure, in the difference value of epimere configuration AGC value, reliability value before the left column arrangement corrects.Use the AGC difference value that gives from comparing unit 701 that reliability value is proofreaied and correct then.Here, difference value is according to its big or small additional level " 0 ", " 1 ", " 2 ", difference value during for " 2 " before correction reliability value get under any one situation of " 1,2,3,4 " and all be corrected into minimum " 1 ".The table that the also variable one-tenth of this table has other values.
MUX806d selects the reliability value 806b that is proofreaied and correct by checking list 806a and proofreaies and correct the some of preceding reliability value 806c.MUX810d selects the reliability value 810b that is proofreaied and correct by checking list 810a and proofreaies and correct the some of preceding reliability value 810c in addition.
Correcting unit 806,810 selects to proofread and correct reliability value 806b, 810b according to the information 702,703 about the height of the AGC value between shunt in the low relatively shunt of AGC value, the shunt that AGC value is high relatively selects to proofread and correct preceding reliability value 806c, 810c.Reliability value 806e after the selection, 810e are output to the carrier selecting 127 of Figure 10.
According to above structure, by to the AGC value low relatively shunt proofread and correct according to its difference component, calculate the reliability value reflected actual accepting state, just can carry out the diversity of each carrier wave.In addition, also can disappear into 0 method with the reliability value that makes the low relatively shunt of AGC value under the significantly big situation of difference value proofreaies and correct.The influence of the carrier wave of the shunt by just can in carrier diversity, getting rid of like this accepting state significance difference.
In addition, by in addition, except that using above-mentioned checking list, by removing with the AGC value or taking advantage of 1 reliability decision result's correction also can obtain same effect.In addition, by not being to proofread and correct the reliability value that temporarily calculates, but from transmission line feature power 601 computed reliabilities of average power 602 and each carrier wave the time, use the AGC difference value to calculate and reflected that the reliability value of accepting state also can obtain same effect.
As described above according to present embodiment 2, even under the relative difference situation that significantly change is big of the received power between a plurality of shunt, reflected that by proofreading and correct the reliability value of the low relatively shunt of received power, calculating the reliability value of actual received power just becomes possibility.By using the reliability value after this correction that each carrier wave is selected/synthesized, just can carry out diversity influence, each carrier wave of the carrier wave of the shunt of having got rid of the accepting state relative mistake then.
(embodiment 3)
Then the OFDM diversity receiving device in the embodiments of the invention 3 is described.Shown in Figure 13 about the structure of the OFDM diversity receiving device of present embodiment 3 (its 1).In addition shown in Figure 14 about the structure of the OFDM diversity receiving device of present embodiment 3 (its 2).The OFDM diversity receiving device of present embodiment is not the mode of proofreading and correct reliability value with the AGC value, but is carrying out the carrier wave selection, using the AGC value when synthesizing.
At first the OFDM diversity receiving device to structure with Figure 13 describes.Use identical mark with embodiment 1 and embodiment 2 identical parts, therefore omit its explanation.Signal 901 is the AGC values that are input to carrier selecting 127C from the delayed unit 503 of AGC107.Same signal 902 is the AGC values that are input to carrier selecting 127C from the delayed unit 504 of AGC108.
In carrier selecting 127C, carry out the selection, synthetic of carrier wave according to reliability value, to be judged as the carrier wave of the remarkable low shunt of received power from the AGC value of being imported, no matter how its reliability value is not used.In addition, carrier selecting 127C along separate routes is being 3 when above, also can work as the received power of 1 shunt when significantly low, only gives up the carrier wave of corresponding shunt, carries out diversity in carrier waves of other shunt.Can access further effect in the case.
OFDM diversity receiving device shown in Figure 14 compares the AGC value of two shunt, is the mode of concentrating the carrier wave that does not use the low shunt of received power dividing under the significantly big situation of difference.1001 pairs two AGC values along separate routes of comparing unit compare, and judge equally with the comparing unit 701 of Figure 11 whether the difference value of the AGC value of two shunt surpasses predetermined threshold value.The difference value of comparing unit 1001 is to give carrier selecting 127D with this advisory under the above situation of predetermined threshold value.When carrier selecting 127D receives such notice, make the carrier wave of the shunt that received power is low relatively in selecting, synthesizing, not use.
Method for removing to the carrier wave among the carrier selecting 127D describes below.For example in common processing, in the OFDM diversity receiving device of forming along separate routes by two, use along separate routes 1 the reliability value and the reliability value of shunt 2 about certain corresponding carrier wave, be weighted synthetic to the carrier wave of two sides' shunt.But under the received power that for example is judged as along separate routes 1 situation lower than predetermined reference value and difference value be under situation predetermined value more than, then synthetic two carrier waves, carrier wave that only will shunt 2 outputs to error correcting unit 128.The contribution degree of the carrier wave of the low shunt of received power is disappeared.
In the selection of each carrier wave, also the carrier wave of shunt that can received power is low forecloses from the object of selecting candidate, and the carrier wave former state of the opposing party's shunt is outputed to the error correcting unit.And then, under the situation of the OFDM diversity receiving device of forming by the shunt more than 3, when the not enough predetermined value of the received power of 1 shunt, can obtain further effect by using this shunt carrier wave in addition just to synthesize.By above processing, just can avoid the harmful effect in the carrier diversity that the carrier wave by the relatively significantly low shunt of received power causes.
According to embodiment 3, the carrier wave of getting rid of the relatively significantly low shunt of significantly low shunt of received power or received power carries out the selection of each carrier wave/synthetic possibility that just becomes as described above.Just reach the diversity of each carrier wave of the influence of carrying out the carrier wave of having got rid of the received power difference then.
(embodiment 4)
Then the OFDM diversity receiving device in the embodiments of the invention 4 is described.The structure of the OFDM diversity receiving device shown in Figure 15 in the present embodiment (its 1).
The OFDM diversity receiving device of present embodiment uses the C/N value to carry out the correction of reliability value, perhaps carries out the eliminating of the shunt of accepting state difference.In so far illustrated embodiment 1～3, judge the accepting state change and carry out the correction of reliability value that according to the AGC value OFDM diversity receiving device of embodiment 4 is judged accepting state with the C/N value.
C/ N computing unit 1101,1102, behind FFT by use the SP signal the calculating of average power of balanced carrier wave carry out the calculating of C/N value.The calculated example of mean value as, consider the average of 1 OFDM symbol size degree etc., carry out the correction of the high reliability value of real-time and just become possibility receiving change in the case.As the calculating of mean value, also can use the average of several OFDM symbol size degree for example.
The notion of the calculating of the value of C/N shown in Figure 16.The average power of the signal that power 1111 expressions receive.The signal that receives comprises carrier wave composition 1112 and noise contribution 1113.The average power of the signal that receives is the additive value of this carrier wave composition and noise contribution, is the represented power of arrow 1117.Here, like that only the power 1116 of carrier wave composition is known as mentioned above, and the difference 1114 final and original noise contributions 1115 of average power 1117 that calculates and known carrier power 1116 equate.Can calculate the C/N value from the ratio calculating of average power 1117 and difference 1114.In addition, calculate the C/N value from the change that disperses payload signal.
In OFDM diversity receiving device shown in Figure 15, the difference value and the predetermined threshold value of the C/N value in 1103 pairs two shunt of comparing unit compare.Comparing unit 1103 surpasses under the situation of predetermined threshold value in result relatively, and the information 1104 of signal etc. of shunt that will comprise information, difference value, the appointment C/N value difference of needs correction sends Calculation of Reliability unit 125,126 to.
In addition, when calculating in order to supply C/N and the delay of the timing of reliability value poor, inserts suitable delayer delay is adjusted.But, do not having under the situation of delayer, if it is stable to receive change, then can access same effect.
Calculation of Reliability unit 125,126 carries out at needs under the situation of correction of reliability value, and the reliability value of proofreading and correct with the shunt that makes C/N value relative mistake according to difference value reduces.In the case, use the same checking list of correcting unit with illustrated Figure 12 in embodiment 2, carry out correction according to the difference value of C/N value.Be reliability computing unit 125,126, use by the difference value of C/N value and proofread and correct with the checking list that the matrix of proofreading and correct preceding reliability value is formed.Calculation of Reliability unit 125,126 also can make reliability value disappear into 0 under the significantly big situation of difference value in addition.Just can get rid of the influence of the carrier wave of C/N value significance difference thus.
In addition, remove or take advantage of and proofread and correct reliability value, also can access same effect by difference value with the C/N value.In addition, not to proofread and correct the reliability value that temporarily calculates, but the time from the transmission line feature power calculation reliability of average power and each carrier wave, use the difference value calculating of C/N value to reflect the reliability value of accepting state.Also can obtain same effect with the method.
OFDM diversity receiving device shown in Figure 17 (its 2), the difference value in the C/N value surpasses under the situation of predetermined threshold value similarly to Example 3, makes dividing the concentrated carrier wave that does not use the shunt of C/N value relative mistake.From the signal 1201 of comparing unit 1103 output is the information that two along separate routes the comparative results of C/N value is notified to carrier selecting 127E.Carrier selecting 127E is under the situation of the notice more than the threshold value at the difference value that receives the C/N value, does not use the processing of carrier wave of the shunt of C/N value relative mistake.Get rid of the processing of carrier wave,, in weighting, do not use the carrier wave of C/N value, the opposing party's carrier wave former state is along separate routes outputed to error correcting unit 128 than the shunt of predetermined reference difference as illustrated among the embodiment 3.In addition, in carrier wave is selected, also can select to foreclose the candidate, the opposing party's carrier wave former state is along separate routes outputed to error correcting unit 128 from it.
And then, under situation with the shunt more than 3, also can be so that carry out diversity in the carrier wave beyond the poorest relatively shunt of C/N value.Can access further effect in the case.
OFDM diversity receiving device shown in Figure 180 (its 3) from the result in each C/N value that calculates along separate routes, carries out the reliability value correction at each on along separate routes respectively.Identical with embodiment 1, be reflected in the reliability value that calculates for making actual accepting state, Calculation of Reliability unit (R calculating) 125F, 126F proofread and correct reliability value according to the C/N value that becomes the index of accepting state.
Correction among Calculation of Reliability unit 125F, the 126F is used with the equal checking list of the checking list of illustrated Fig. 9 in embodiment 1 and is carried out according to the size of C/N value.That is, the C/N value is distributed certain value to each predetermined grade, proofread and correct with the checking list that is worth thus and proofreaies and correct the matrix composition of preceding reliability value.
In addition, also can make the reliability value of the carrier wave of C/N value significance difference disappear into 0.Thus, just can get rid of the harmful effect of the carrier wave of C/N value difference.And then, also can represent the C/N value by enough grade points arbitrarily, by removing with this grade point or taking advantage of reliability value to proofread and correct.Also can access same effect in the case.
In addition, by not being to proofread and correct the reliability value that temporarily calculates, but from the transmission line feature power calculation reliability value of average power and each carrier wave the time, use the calculating of C/N value to reflect that the reliability value of accepting state also can obtain same effect.
OFDM diversity receiving device shown in Figure 19 (its 4) is not in the correction of reliability value, but uses the C/N value that calculates in each shunt in carrier diversity.Carrier selecting 127G to the shunt of C/N value than predetermined reference difference, by in above-mentioned illustrated processing, gets rid of the carrier wave of this shunt and carries out diversity.
As described above according to embodiment 4, by correction according to the reliability value of C/N state, calculating has reflected that the reliability value of actual accepting state just becomes possibility, carry out the selection of each carrier wave/synthetic by using reliability value after this correction, perhaps each carrier wave of the carrier wave of the shunt of having got rid of the C/N difference is selected/synthesize, just can carry out the diversity of the influence of having got rid of the carrier wave that C/N differs from.
(embodiment 5)
Then the OFDM diversity receiving device in the embodiments of the invention 5 is described.The structure of the OFDM diversity receiving device among the embodiment shown in Figure 20 5.Signal the 1501, the 1502nd, respectively the carrying out that receives by antenna 1503,1504 the RF signal of frequency division multiplex.
Amplifying unit 1505,1506 amplifies to the received signal.The signal that converter unit 1507,1508 inputs are exaggerated is demodulated to complex signal by orthogonal detection, and then uses orthogonal function to carry out from time shaft to the frequency transformation of axis.Converter unit 1507,1508 extracts and carried out multiplexed a plurality of carrier waves on frequency axis like this.
Demodulating unit 1509,1510 to the carrier wave that is extracted respectively by converter unit 1507,1508, carries out equilibrium by proofreading and correct its phase place and amplitude etc. as required.Calculation of Reliability unit 1511,1512 to each balanced carrier wave of being exported respectively by demodulating unit 1509,1510, is a benchmark computed reliability value with its power etc.
Here, amplifying unit 1505,1506 amplifies to received signal., from the power by the carrier wave of the detection unit in the converter unit 1507,1508 output, directly calculate under the situation of reliability value, this reliability value does not reflect actual received power sometimes for this reason.For this reason, Calculation of Reliability unit 1511,1512 is given the information 1513,1514 of the amplification degree of amplifying unit 1505,1506.Calculation of Reliability unit 1511,1512 uses 1513,1514 pairs of reliability value of this information to proofread and correct.
Calculation of Reliability unit 1511,1512, use will be included in the amplification degree in the information 1513,1514 and the reliability value temporarily calculated is proofreaied and correct reliability value as the checking list of parameter.Here used checking list and uses Fig. 8, Fig. 9 illustrated identical in embodiment 1.The reliability value of being proofreaied and correct is output to carrier selecting 1515.Carrier selecting 1515 is selected the big carrier wave of these reliability value, and it is synthetic perhaps to carry out the weighting of each carrier wave according to reliability value.
The output signal of error correcting unit 1516 incoming carrier selection/synthesis units 1515, and implement necessary error correcting.In addition, in amplifying unit 1505,1506, also can use the amplifier of tuner and LAN etc.In addition in converter unit 1507,1508, by carrying out extracting a plurality of carrier waves that are present on the frequency axis from the Fourier transform and the conversion of having used synthesizer of time domain to the conversion of frequency domain.Converter unit 1507,1508 carries out frequency translation according to necessity in addition, is transformed into IF frequency band or base band frequency band.
Calculation of Reliability unit 1511,1512, the not only output by amplifying unit 1505,1506, also the C/N value of the signal that can receive by calculating is used this C/N value is proofreaied and correct reliability value as the checking list of parameter.
(embodiment 6)
Then the OFDM diversity receiving device in the embodiment of the invention 6 is described.Figure 21 illustrates the structure of the OFDM diversity receiving device among the embodiment 6.Signal the 1601, the 1602nd is respectively by antenna 1603,1604 frequency division multiplex signals that received.1605,1606 pairs of signals that received by antenna 1603,1604 respectively of amplifier amplify.In amplifier 1605,1606, use as the LAN of low noise amplifier etc.
Frequency mixer 1607,1608 becomes the IF frequency band with the frequency of the signal that receives from the RF frequency band transformation.Filter 1609,1610 is removed unnecessary radio-frequency component from the output signal of frequency mixer 1607,1608 respectively and is reduced noise.Detection unit 1611,1612 is demodulated to complex signal by quadrature demodulation with the signal that receives, and carries out frequency translation at the base band frequency band.
Temporal frequency converter unit (T/F converter unit) 1613,1614 extracts and carried out multiplexed a plurality of carrier waves on frequency axis by become the signal of frequency axis to the received signal from the signal transformation of time shaft.For example use fast Fourier transform etc. here.1615,1616 pairs of carrier waves that carried out demodulation of balanced unit are proofreaied and correct its phase place and amplitude.
(the R calculating) 1617,1618 of Calculation of Reliability unit is benchmark with power of each carrier wave etc., calculates its reliability value.At this moment, owing to be to have carried out the signal after the amplification by 1605,1606 pairs of power of amplifier, so its power does not reflect actual accepting state sometimes.The reliability value that for this reason calculates does not reflect actual accepting state sometimes yet.For this reason, Calculation of Reliability unit 1617,1618 uses 1619,1620 pairs of reliability value of output information of amplifier 1605,1606 to proofread and correct.
The correction here is being also as using Fig. 8 and Fig. 9 illustrated like that among the embodiment 1, the output of the amplifier checking list as parameter is carried out in use.Thus, the reliability value that calculates just can reflect accepting state.Be output to carrier selecting 1621 with Calculation of Reliability unit 1617,1618 reliability value of being proofreaied and correct.Carrier selecting 1621 is selected the big carrier wave of reliability value, and is perhaps synthetic according to the weighting of reliability value execution carrier wave.The output signal of error correcting unit 1622 incoming carrier selection/synthesis units 1621 is also implemented necessary error correcting.
As described above according to embodiment 5,6, in not only receiving the receiving system that ofdm signal also receives frequency division multiplex signal (FDM), calculate the reliability value that has reflected accepting state, make the diversity of carrying out each carrier wave just become possibility.According to above embodiment, the effect of diversity is improved.
(embodiment 7)
One step described the OFDM diversity receiving device in the embodiment of the invention 7 on one side with reference to accompanying drawing.If the diversity receiving device of embodiment 7 has the Veterbi decoding unit, Figure 22 illustrates its structure.Arrive electric wave the 1701, the 1702nd, be input to the received signal of the antenna 1703,1704 of diversity receiving device, be made as frequency division multiplex signal.Detection unit 1705,1706 becomes the signal of IF frequency band with the received signal frequency translation of RF frequency band, carries out conversion by orthogonal detection to complex digital signal.Temporal frequency converter unit 1707,1708 carries out conversion from the signal of time domain to the signal of frequency domain to the output signal of detection unit 1705,1706 respectively, exports each carrier wave.Demodulating unit 1709,1710 carries out the phase place of carrier wave and the correction of amplitude on frequency axis.
Calculation of Reliability unit 1711,1712 calculates the used reliability value X of weighting in Veterbi decoding.Reliability value X is from the power of each carrier wave and becomes the comparison of the power of benchmark, the value that is calculated with several grades according to threshold value arbitrarily.Hope used reliability value X in Veterbi decoding is even also calculated as the value with reliability to a certain degree under the low situation of absolute power.For this reason, the power variation that becomes benchmark is set, come computed reliability value X by change according to the power of each carrier wave.
Reliability value computing unit 1713,1714 calculates and is dividing concentrated used reliability value Y.Reliability value Y and reliability value X are same, from the power of each carrier wave with become the comparison of the power of benchmark, are calculated with several grades according to threshold value arbitrarily.As illustrated in the prior embodiment, to wish to divide and concentrate a used reliability value Y, the reflection absolute power is calculated., be held in necessarily by the power that will become benchmark, the computed reliability value is calculated the reliability value Y that has reflected absolute power for this reason.Here reliability value Y is called the 1st reliability value, reliability value X is called the 2nd reliability value.
Carrier selecting 1715, according to 1713, the 1714 reliability value Y that calculate from the Calculation of Reliability unit, selection, the weighting of carrying out carrier wave are synthetic.1716 pairs of each the carrier wave dependability value X weightings in Veterbi decoding unit are also carried out the optimal solution sign indicating number.
As described above according to embodiment 7, just can calculate and be suitable for diversity and Veterbi decoding reliability value separately.Its result just can improve the effect of diversity and Veterbi decoding.The reduction of the reduction of circuit scale in addition,, processing load also becomes possibility.
(embodiment 8)
Then the diversity receiving device in the embodiments of the invention 8 is described.Figure 23 illustrates the structure of the diversity receiving device of embodiment 8.This diversity receiving device is made up of two series, is called " A along separate routes ", " B along separate routes " here.This diversity receiving device has the diversity of carrying out at each each carrier wave of being decoded in along separate routes, is entered into the structure of Veterbi decoding unit afterwards.
Arriving electric wave 1803,1804 is respectively the ofdm signal that arrives antenna 1805,1806. Tuner 1807,1808 selects receipts, and the received signal of RF frequency band is downconverted to the IF frequency band.ADC1809,1810 analog signals with tuner 1807,1808 outputs are transformed into digital signal.Orthogonal detection unit (DET) 1811,1812 carries out orthogonal detection to ADC1809,1810 output respectively, is transformed into complex digital signal.Fast Fourier transform unit (FFT) 1813,1814 becomes each carrier wave as the signal on the frequency axis with the ofdm signal that receives from time axis conversion.
In the signal behind FFT, mix the carrier wave that has the carrier wave of data and inserted the effective load signal of dispersion (SP signal) at regular intervals.The SP signal is its amplitude and the known signal of phase place. Balanced unit 1815,1816 uses this SP signal to infer the transmission line property of each carrier wave.Figure 24 A, Figure 24 B illustrate the structure chart of balanced unit 1815,1816 respectively.Complex divider 1815a, 1816a carry out complex division with known SP signal to the SP signal that receives, and obtain the transmission line property of SP signal location.Interpolating unit 1815b, 1816b carry out interpolation by the transmission line property to the SP signal location on time-axis direction and frequency axis direction, obtain the transmission line property of whole carrier positions.The carrier wave of data carries out equilibrium by using complex divider 1815c, the signal of 1816c behind complex division computing FFT on the transmission line property of each carrier position like this.
Balanced carrier wave and the transmission line property that calculates have been carried out in balanced unit 1815,1816 outputs.The transmission line property 1817 among the balanced unit 1815 output shunt A and the carrier wave 1819 of data.The transmission line property 1818 among the balanced unit 1816 output shunt B and the carrier wave 1820 of data.
Power calculation unit (P calculating) 1821 and 1822 is calculated the power (transmission line property power) of the transmission line property of each carrier wave from the transmission line property of being exported.Average power is calculated unit (Pa calculating) 1823,1824 and is calculated average power PB from the output of power calculation unit 1821,1822 respectively.This average power PB becomes the benchmark of calculating used reliability value X (the 2nd reliability value) in Veterbi decoding.Then, Calculation of Reliability unit (R calculating) 1827,1828 computed reliability value X.This reliability value X as benchmark, is divided into average power PB several grades according to certain threshold value and calculates.
On the other hand, average power is calculated unit (Pa calculating) 1825,1826 and is calculated average power PA.This average power PB becomes calculating and is dividing the benchmark of concentrating used reliability value Y (the 1st reliability value).Calculation of Reliability unit (R calculating) 1829,1830 computed reliability value Y.This reliability value Y as benchmark, is divided into average power PA several grades according to certain threshold value and calculates.Here Calculation of Reliability unit 1829 is called the 1st Calculation of Reliability unit among the shunt A.In addition Calculation of Reliability unit 1830 is called the 1st Calculation of Reliability unit among the shunt B.And then Calculation of Reliability unit 1827 is called the 2nd Calculation of Reliability unit among the A along separate routes.In addition Calculation of Reliability unit 1828 is called the 2nd Calculation of Reliability unit among the shunt B.Average power is calculated unit 1823,1825 be called fiducial value computing unit among the A along separate routes, average power is calculated unit 1824,1826 be called fiducial value computing unit among the B along separate routes.
Be arranged at the schematic diagram of the reliability value computing unit 1910 in the Calculation of Reliability unit 1827,1828,1829,1830 shown in Figure 25.The 1911st, become the average power of benchmark, with average power as benchmark, as threshold setting from " 3 " to " 1 ".Power 1915,1916,1917,1918 is represented the transmission line property power of certain 4 carrier wave, and big highly more then its power is big more.Power 1915 is bigger than threshold value 3, and reliability value is calculated as 4 of maximum.Power 1916 is threshold value more than 2 and less than 3, and reliability value is calculated as 3.Equally, power 1917 for threshold value more than 1 and less than 2 reliability value be calculated as 2, power 1918 not enough threshold value 1 reliability value are calculated as 1.Here, become the average power of the benchmark of reliability value calculating, wish to change (short time is average), how all to be held in certain (average for a long time) no matter wish to receive change about average power PA based on receiving about average power PB.
In embodiment 8, average power and reliability value calculating are distinguished into Viterbi usefulness and diversity usefulness, use the computational methods that are suitable for average power separately.Figure 26 is the functional block diagram that the expression average power is calculated an example of unit.Average power is calculated unit 1901 and is used unlimited loop filter (being called iir filter) to calculate average power.
When the power (transmission line property power) of the transmission line property of each carrier wave during from power calculation unit 1821,1822 outputs, multiplier 1902 usefulness filter gain K output signal therewith multiply each other.Then 1904 pairs of average powers 1906 of delayer postpone, and multiplier 1905 multiply by (1-K) doubly with this inhibit signal.Addition is carried out in the output of 1903 pairs of multipliers 1902 of adder and the output of multiplier 1905, and addition result is exported as average power 1906.
In the calculating of the average power PB of the calculating benchmark that becomes the reliability value X used by Veterbi decoding, increase by value the filter gain K in the iir filter among Figure 26, tracing property is improved.Otherwise in the calculating of the average power PA of the calculating benchmark that becomes the used reliability value Y of diversity, reduce, make the tracing property variation of IIR by value with the filter gain K in the iir filter.Like this, average power and reliability value calculating are distinguished into Viterbi usefulness and diversity usefulness, calculate the average power that is suitable for separately.
The carrier selecting 1831 of Figure 23, it is synthetic to carry out carrier wave and reliability value X and selection or weighting.The relation of carrier selecting shown in Figure 27 1831 and internal structure and input signal.Carrier selecting 1831 is made of carrier diversity unit 2003 and reliability value diversity unit 2004.
The schematic diagram of the content of used table during the weighting of expression shown in Figure 28 A, Figure 28 B is synthetic.Shown in Figure 28 A the 1st shows x, is the synthetic table of weighting that carries out carrier wave.Shown in Figure 28 B the 2nd table y is the synthetic table of weighting that carries out the reliability value X that Viterbi uses.Such as shown in figure 27, the carrier wave 2006 of the carrier wave 2005 of the reliability value 2002 of the reliability value 2001 of input shunt A, shunt B, shunt A, shunt B in showing x.Like that, the value of the left end row of table x is that the value of the reliability value Y of B along separate routes, epimere is the reliability value Y of A along separate routes shown in Figure 28 A.Reliability value Y has 4 values of from 1 to 4.
Carrier wave is weighted synthetic according to reliability value Y.For example, be " 1 " at the reliability value Y of shunt A, the reliability value Y of B is under the situation of " 3 " along separate routes, then weighting synthesizes (A+3B)/4.In addition, if the reliability value Y of two shunt equates that then weighting synthesizes (A+B)/2.The carrier diversity unit 2003 like this, and the synthetic carrier wave 1832 of weighting has been carried out in output.
On the other hand, the reliability value X (b) (2008) of the reliability value X (a) (2007) of the reliability value Y (2002) of the reliability value Y (2001) of input shunt A, shunt B, shunt A, shunt B in showing y.Like that, the value of the left end of table row is that the value of the reliability value Y of B along separate routes, epimere is the reliability value Y of A along separate routes shown in Figure 28 B.
The reliability value that Viterbi is used is by obtaining with the synthetic reliability value X of table x weighting similarly.As show shown in the y such, for example the reliability value Y at shunt A is " 1 ", and the reliability value Y of B is under the situation of " 3 " along separate routes, then is weighted synthetic as (a+3b)/4, reliability value Y as two shunt is equal, then is weighted to synthesize as (a+b)/2.The reliability value diversity unit 2004 like this, and the synthetic Viterbi reliability value 1833 of weighting has been carried out in output.The Veterbi decoding unit 1834 of Figure 23 weighting Viterbi on carrier wave 1832 carries out the optimum decoding with reliability value 1833.
In addition, although as Figure 24 is illustrated, be illustrated in the present embodiment to using iir filter to calculate average power.But by using adder and divider to calculate average power, when calculating average power, adopt average and long-time two average classes of short time, also can obtain same effect.In addition, weighting illustrated in Figure 27 is synthetic, uses other table also can obtain same effect.In addition, used table y in the selection of used table x and reliability value X in the selection of carrier wave/synthetic/synthetic is even different tables also can obtain same effect.Also can obtain same effect with the carrier wave of selecting the big shunt of reliability value Y and the method for reliability value X in addition.
(embodiment 9)
Then the diversity receiving device in the embodiments of the invention 9 is described.The diversity receiving device of embodiment 9 cuts down circuit scale and handle load, and calculating is suitable for diversity and Veterbi decoding reliability value separately.The structure of the diversity receiving device of present embodiment shown in Figure 29.The additional identical mark of part identical with embodiment 7,8 in Figure 29 describes.
Fiducial value output unit (fiducial value) 2101,2102 has predetermined reference value Ao respectively, and this fiducial value Ao can at random change by setting.Reliability value Y as benchmark, is divided into predetermined reference value Ao several grades according to certain threshold value and calculates.Because fiducial value Ao becomes certain value according to setting,, reflected that the calculating of the reliability value Y of absolute power just becomes possibility so there is not the change ground of the benchmark of reliability value calculating.
On the other hand, in reliability value X, the average power PB that calculates from the transmission line property power meter of each carrier wave with embodiment 8 identical uses.Because average power PB reflection receives change, so even under the low situation of absolute power, the value that reliability value X also can be used as reliability is to a certain degree calculated.
With carrier selecting 1831, selection, the weighting of carrying out carrier wave according to reliability value Y are synthetic.Viterbi is synthesized into the selection or the weighting of reliability value 1833 by reliability value X.Carried out selection or weighting synthetic carrier wave and Viterbi reliability value like this, be output to Veterbi decoding unit 1834, the weighting Viterbi carries out the optimum decoding with reliability value in carrier wave.
(embodiment 10)
Then the diversity receiving device in the embodiments of the invention 10 is described.The structure of the diversity receiving device of embodiment shown in Figure 30 10.In Figure 30, the mark additional identical with the part of embodiment 7～9 also omits explanation.In the present embodiment, used reliability value X in the weighting of Veterbi decoding is that calculate on the basis with the transmission line property power of the carrier wave after the diversity.
Carrier selecting 1831, not only each carrier wave, reliability value Y along separate routes of input also imports the transmission line property power 2203,2204 by power calculation unit (P calculating) 1821,1822 each carrier wave that is calculated.Carrier selecting 1831, according to reliability value Y to transmission line property power with carrier wave is selected or weighting is synthetic.The weighting here is synthetic as illustrated among the embodiment 8, according to reliability value Y is carried out as the CALCULATION OF PARAMETERS table.In addition, like this too about carrier wave.Transmission line property power after the diversity is to Calculation of Reliability unit (R calculating) 2207, with each average power 2201,2203 input along separate routes.
The schematic diagram of the function of the Calculation of Reliability of expression shown in Figure 31 unit 2207.Calculation of Reliability unit 2207 is made of average calculation unit 2301 and reliability value computing unit 2303.2207 inputs of Calculation of Reliability unit are average power 2201 (PB1), the average power 2202 (PB2) of shunt B and the transmission line property power 2205 of the carrier wave after the diversity of A along separate routes, computed reliability value X (2208).
The reliability value X that calculates (2208) is output to the Veterbi decoding unit 1834 of Figure 30.Carrier wave after the diversity 2206 is such as shown in figure 31 in addition, is output to Veterbi decoding unit 1834 as carrier wave 2209 former states.Reliability value 2208 is weighted in carrier wave 2209, carries out optimum decoding by Veterbi decoding unit 1834.
According to embodiment 8～10, the calculating that is suitable for the reliability value of diversity just becomes possibility as described above.And the reliability value of using based on the Veterbi decoding of the transmission line property power of the carrier wave after the diversity calculated just becomes possibility.
Although in the various embodiments described above, Orthodoxy Frequency Division Multiplex (OFDM) is described in addition, also can use the present invention about the reception of the signal of frequency division multiplex (FDM) mode.
Claims (37)
1. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
Control receives the gain of the tuner of above-mentioned frequency division multiplex signal, and each AGC unit along separate routes of the AGC value in the output gain control;
To carry out each detection unit along separate routes of detection by the resulting FDM signal of above-mentioned tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
The AGC value of exporting from the payload signal and the above-mentioned AGC unit of above-mentioned balanced unit output is calculated each Calculation of Reliability unit along separate routes of the reliability value of each carrier wave; And
According to the reliability value of above-mentioned Calculation of Reliability unit, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
2. diversity receiving device according to claim 1 is characterized in that:
Above-mentioned Calculation of Reliability unit has,
Calculate each reliability value computing unit along separate routes of the reliability value of each carrier wave from the payload signal of above-mentioned balanced unit output; And
According to the AGC value of above-mentioned AGC unit, the reliability value correcting unit that the reliability value that is calculated by above-mentioned reliability value computing unit is proofreaied and correct;
Above-mentioned carrier selecting, according to the correction reliability value of above-mentioned reliability value correcting unit, selection or the weighting of each carrier wave being carried out carrier wave are synthetic.
3. diversity receiving device according to claim 2 is characterized in that:
Above-mentioned reliability value correcting unit is input to predetermined checking list with the AGC value of above-mentioned AGC unit and the reliability value of above-mentioned reliability value computing unit, and based on above-mentioned checking list above-mentioned reliability value is proofreaied and correct in above-mentioned each shunt.
4. diversity receiving device according to claim 2 is characterized in that:
Above-mentioned reliability value correcting unit to the carrier wave of the received power judged from the AGC value of the above-mentioned AGC unit shunt lower than predetermined reference value, disappears into 0 correction by the reliability value that makes this carrier wave, gets rid of particular carrier wave.
5. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
Control receives the gain of the tuner of above-mentioned frequency division multiplex signal, and each AGC unit along separate routes of the AGC value in the output gain control;
To carry out each detection unit along separate routes of detection by the resulting FDM signal of above-mentioned tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
Calculate each Calculation of Reliability unit along separate routes of the reliability value of each carrier wave from the payload signal of above-mentioned balanced unit output; And
Eliminating is judged as the carrier wave of the received power shunt lower than predetermined reference value from the AGC value of above-mentioned AGC unit, in above-mentioned received power is to use the reliability value that obtains from above-mentioned Calculation of Reliability unit under the situation more than the predetermined reference value, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
6. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
Control receives the gain of the tuner of above-mentioned frequency division multiplex signal, and each AGC unit along separate routes of the AGC value in the output gain control;
To carry out each detection unit along separate routes of detection by the resulting frequency division multiplex signal of above-mentioned tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
The comparing unit of the difference value of the above-mentioned AGC value of each shunt of comparison and output AGC value;
Calculate Calculation of Reliability unit of each shunt of the reliability value of each carrier wave based on the difference value of the AGC value of the payload signal of above-mentioned balanced unit output and the output of above-mentioned comparing unit; And
According to the reliability value of above-mentioned Calculation of Reliability unit, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
7. diversity receiving device according to claim 6 is characterized in that:
Above-mentioned Calculation of Reliability unit has,
The payload signal of using above-mentioned balanced unit to export is calculated the reliability value computing unit of the reliability value of each carrier wave; And
The reliability value correcting unit of with above-mentioned AGC difference value the reliability value of above-mentioned reliability value computing unit being proofreaied and correct based on the comparative result of above-mentioned comparing unit;
Above-mentioned carrier selecting, according to the correction reliability value of above-mentioned reliability value correcting unit, selection or the weighting of each carrier wave being carried out carrier wave are synthetic.
8. diversity receiving device according to claim 7 is characterized in that:
Above-mentioned reliability value correcting unit will be input to predetermined checking list from the difference value of the above-mentioned AGC value of above-mentioned comparing unit output and the output of above-mentioned reliability value computing unit, and based on above-mentioned checking list above-mentioned reliability value be proofreaied and correct.
9. diversity receiving device according to claim 7 is characterized in that:
Above-mentioned reliability value correcting unit under the difference value from the above-mentioned AGC value of above-mentioned comparing unit output is situation more than the predetermined threshold value, disappears into 0 correction by the reliability value that makes the relatively low shunt of received power, gets rid of particular carrier wave.
10. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
Control receives the gain of the tuner of above-mentioned frequency division multiplex signal, and each AGC unit along separate routes of the AGC value in the output gain control;
To carry out each detection unit along separate routes of detection by the resulting frequency division multiplex signal of above-mentioned tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
Compare each above-mentioned AGC value along separate routes, relatively whether the difference value of AGC value is more than the predetermined threshold value, and the comparing unit of output comparative result;
Calculate each Calculation of Reliability unit along separate routes of the reliability value of each carrier wave from the payload signal of above-mentioned balanced unit output; And
Under the difference value that is judged to be the above-mentioned AGC value of being exported by above-mentioned comparing unit is situation more than the predetermined threshold value, the carrier wave of getting rid of the relatively low shunt of received power, under the situation of the not enough predetermined threshold value of above-mentioned difference value, use the reliability value of above-mentioned Calculation of Reliability unit, carry out the selection or the synthetic carrier selecting of weighting of carrier wave.
11. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
To carry out each detection unit along separate routes of detection by the resulting frequency division multiplex signal of tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
Use the carrier wave of above-mentioned balanced unit output to calculate C/N computing unit of each shunt of C/N value;
Use the C/N value of the payload signal of above-mentioned balanced unit output and the output of above-mentioned C/N computing unit to calculate each Calculation of Reliability unit along separate routes of the reliability value of each carrier wave; And
According to the reliability value of above-mentioned Calculation of Reliability unit, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
12. diversity receiving device according to claim 11 is characterized in that:
Above-mentioned Calculation of Reliability unit has,
The payload signal of using above-mentioned balanced unit to export is calculated each reliability value computing unit along separate routes of the reliability value of each carrier wave; And
The reliability value correcting unit of the reliability value of above-mentioned reliability value computing unit being proofreaied and correct based on the C/N value of above-mentioned C/N computing unit;
Above-mentioned carrier selecting, according to the correction reliability value of above-mentioned reliability value correcting unit, selection or the weighting of each carrier wave being carried out carrier wave are synthetic.
13. diversity receiving device according to claim 12 is characterized in that:
Above-mentioned reliability value correcting unit is input to predetermined checking list with the C/N value of above-mentioned C/N computing unit and the reliability value of above-mentioned reliability value computing unit, and according to above-mentioned checking list above-mentioned reliability value is proofreaied and correct.
14. diversity receiving device according to claim 12 is characterized in that:
Above-mentioned reliability value correcting unit disappears into 0 correction by the reliability value that makes the shunt lower than predetermined reference value of above-mentioned C/N value, gets rid of particular carrier wave.
15. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
To carry out each detection unit along separate routes of detection by the resulting frequency division multiplex signal of tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
Use the carrier wave of above-mentioned balanced unit output to calculate C/N computing unit of each shunt of C/N value;
The payload signal of using above-mentioned balanced unit to export is calculated each Calculation of Reliability unit along separate routes of the reliability value of each carrier wave; And
The carrier wave of the shunt that the C/N value that eliminating is calculated by above-mentioned C/N computing unit is lower than predetermined reference value, under the above-mentioned C/N value situation higher, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave according to the reliability value of above-mentioned Calculation of Reliability unit than predetermined reference value.
16. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
To carry out each detection unit along separate routes of detection by the resulting frequency division multiplex signal of tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
Use the carrier wave of above-mentioned balanced unit output to calculate C/N computing unit of each shunt of C/N value;
The comparing unit of the difference value of relatively each above-mentioned C/N value along separate routes, and output C/N value;
Calculate Calculation of Reliability unit of each shunt of the reliability value of each carrier wave based on the difference value of the C/N value of the payload signal of above-mentioned balanced unit output and the output of above-mentioned comparing unit; And
According to the reliability value of above-mentioned Calculation of Reliability unit, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
17. diversity receiving device according to claim 16 is characterized in that:
Above-mentioned Calculation of Reliability unit has,
The payload signal of using above-mentioned balanced unit to export is calculated each reliability value computing unit along separate routes of the reliability value of above-mentioned each carrier wave; And
Be judged to be the C/N difference value by above-mentioned comparing unit above under the situation of threshold value, the reliability value correcting unit that uses above-mentioned C/N value that the reliability value that is calculated by above-mentioned reliability value computing unit is proofreaied and correct;
Above-mentioned carrier selecting, according to the correction reliability value of above-mentioned reliability value correcting unit, selection or the weighting of each carrier wave being carried out carrier wave are synthetic.
18. diversity receiving device according to claim 17 is characterized in that:
Above-mentioned reliability value correcting unit will be input to predetermined checking list by the output of resulting C/N difference value of above-mentioned C/N computing unit and above-mentioned reliability value computing unit, and according to above-mentioned checking list above-mentioned reliability value be proofreaied and correct.
19. diversity receiving device according to claim 17 is characterized in that:
Above-mentioned reliability value correcting unit, the reliability value of the shunt by making above-mentioned C/N value relative mistake disappears into 0 correction, gets rid of particular carrier wave.
20. a diversity receiving device comprises the shunt more than 2 that is received in the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, possesses:
To carry out each detection unit along separate routes of detection by the resulting frequency division multiplex signal of tuner;
By to by the resulting detection output of above-mentioned detection unit, utilize fast Fourier transform to carry out conversion to frequency domain, and output comprise each fast Fourier transform unit along separate routes of each carrier wave of payload signal from time domain;
To using above-mentioned payload signal to carry out equilibrium, and infer each balanced unit along separate routes of the transmission line property of carrier wave by resulting each carrier wave in above-mentioned fast Fourier transform unit;
Use the carrier wave of above-mentioned balanced unit output to calculate C/N computing unit of each shunt of C/N value;
The comparing unit of the difference value of relatively each above-mentioned C/N value along separate routes of exporting from above-mentioned C/N computing unit, and output C/N value;
Calculate each Calculation of Reliability unit along separate routes of the reliability value of each carrier wave based on the payload signal of above-mentioned balanced unit output; And
Be judged to be above-mentioned C/N difference value by above-mentioned comparing unit is under the situation more than the threshold value, get rid of the carrier wave of C/N value than the shunt of predetermined reference value relative mistake, under the situation of the not enough threshold value of above-mentioned C/N difference value, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave according to the reliability value of above-mentioned Calculation of Reliability unit.
21. a diversity receiving device that comprises the shunt more than 2 that receives frequency division multiplex signal possesses:
Each that above-mentioned frequency division multiplex signal is amplified amplifying unit along separate routes;
Each that a plurality of carrier waves in the frequency division multiplex signal that is included in above-mentioned amplifying unit are extracted converter unit along separate routes;
The output of above-mentioned converter unit is carried out each demodulating unit along separate routes of detection;
Calculate each Calculation of Reliability unit along separate routes of the reliability value of above-mentioned each carrier wave from the output of the output of above-mentioned demodulating unit and above-mentioned amplifying unit; And
According to the reliability value that is calculated by above-mentioned Calculation of Reliability unit, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
22. a diversity receiving device that comprises the shunt more than 2 that receives frequency division multiplex signal possesses:
Each amplifying unit along separate routes of above-mentioned frequency division multiplex signal is received and is amplified in choosing;
The RF signal transformation of above-mentioned amplifying unit is become each mixer unit along separate routes of intermediate-freuqncy signal (below be designated as the IF signal);
IF signal to above-mentioned mixer unit output carries out detection, and is transformed into each detection unit along separate routes of complex signal;
Become the frequency axis signal by time shaft signal transformation, export each temporal frequency converter unit along separate routes of each carrier wave above-mentioned detection unit;
To the carrier wave phase calibration of above-mentioned temporal frequency converter unit and each balanced unit along separate routes of amplitude;
Calculate each Calculation of Reliability unit along separate routes of the reliability value of above-mentioned each carrier wave from the output of the output of above-mentioned balanced unit and above-mentioned amplifying unit; And
According to the reliability value that is calculated by above-mentioned Calculation of Reliability unit, each carrier wave is carried out the selection or the synthetic carrier selecting of weighting of carrier wave.
23. a diversity receiving device that comprises the shunt more than 2 that receives frequency division multiplex signal possesses:
Above-mentioned each obtain the fiducial value computing unit of the 2nd fiducial value that the 1st fiducial value that diversity uses and Veterbi decoding use respectively from the signal power that receives on along separate routes;
In each shunt, calculate the 1st Calculation of Reliability unit of the 1st used reliability value of diversity from above-mentioned the 1st fiducial value;
In each shunt, calculate the 2nd Calculation of Reliability unit of the 2nd used reliability value of Veterbi decoding from above-mentioned the 2nd fiducial value;
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, carry out the selection or the synthetic carrier selecting of weighting of each carrier wave; And
To the output of above-mentioned carrier selecting according to above-mentioned the 2nd reliability value weighting and carry out the Veterbi decoding unit of optimal solution sign indicating number.
24. a diversity receiving device that comprises the shunt more than 2 that receives frequency division multiplex signal possesses:
Above-mentioned each obtain the fiducial value computing unit of the 2nd fiducial value that the 1st fiducial value that diversity uses and Veterbi decoding use respectively from the signal power that receives on along separate routes;
In each shunt, calculate the 1st Calculation of Reliability unit of the 1st used reliability value of diversity from above-mentioned the 1st fiducial value;
In each shunt, calculate the 2nd Calculation of Reliability unit of the 2nd used reliability value of Veterbi decoding from above-mentioned the 2nd fiducial value;
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, selection or the weighting of carrying out each carrier wave are synthetic, and according to above-mentioned the 1st reliability value, select or synthetic above-mentioned the 2nd reliability value and be transformed into the carrier selecting of the 3rd reliability value; And
To from the carrier wave of above-mentioned carrier selecting output according to above-mentioned the 3rd reliability value weighting and carry out the Veterbi decoding unit of optimal solution sign indicating number.
25. diversity receiving device according to claim 24 is characterized in that:
Above-mentioned carrier selecting has,
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, use the 1st operation table to carry out the selection or the synthetic carrier diversity unit of weighting of carrier wave; And
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, use the 2nd operation table to select or synthetic above-mentioned the 2nd reliability value and be transformed into the reliability value diversity unit of the 3rd reliability value.
26. a diversity receiving device comprises being received in and has periodically inserted the shunt more than 2 that disperses the frequency division multiplex signal of payload signal on a plurality of carrier waves, possesses:
Time shaft interpolation and frequency axis interpolation by above-mentioned dispersion payload signal are obtained the transmission line property of each carrier wave, and calculate each power calculation unit along separate routes of the transmission line property power of each carrier wave;
Each the 1st average power along separate routes of using the output of above-mentioned power calculation unit to calculate the average power PA that diversity uses is calculated unit;
Each the 2nd average power along separate routes of using the output of above-mentioned power calculation unit to calculate the average power PB that Veterbi decoding uses is calculated unit;
With above-mentioned average power PA is benchmark each the 1st Calculation of Reliability unit along separate routes from the 1st reliability value of each carrier wave of transmission line property power calculation of above-mentioned each carrier wave;
With above-mentioned average power PB is benchmark each the 2nd Calculation of Reliability unit along separate routes from the 2nd reliability value of each carrier wave of transmission line property power calculation of above-mentioned each carrier wave;
According to each above-mentioned the 1st reliability value along separate routes, carry out the selection or the synthetic carrier diversity unit of weighting of each carrier wave;
According to each above-mentioned the 1st reliability value along separate routes, above-mentioned the 2nd reliability value is selected or synthetic, calculate the reliability value diversity unit of the 3rd new reliability value; And
To the output of above-mentioned carrier diversity unit according to above-mentioned the 3rd reliability value weighting and carry out the Veterbi decoding unit of optimal solution sign indicating number.
27. diversity receiving device according to claim 26 is characterized in that:
Above-mentioned carrier diversity unit, according to the 1st operation table that has used each above-mentioned the 1st reliability value along separate routes, selection or the weighting of carrying out each carrier wave are synthetic;
Above-mentioned reliability value diversity unit is selected above-mentioned the 2nd reliability value or is synthetic according to the 2nd used operation table in each above-mentioned the 1st reliability value along separate routes, and calculates the 3rd new reliability value.
28. diversity receiving device according to claim 26 is characterized in that:
Above-mentioned the 1st average power is calculated the unit, uses from the transmission line property of above-mentioned power calculation unit output and calculates the average power PA that diversity is used;
Above-mentioned the 2nd average power is calculated the unit, uses from the transmission line property of above-mentioned power calculation unit output and calculates the average power PB that Veterbi decoding is used;
29. diversity receiving device according to claim 26 is characterized in that:
Above-mentioned the 1st average power is calculated the unit, by calculating average power to calculate the also long average calculating operation in unit than above-mentioned the 2nd average power.
30. a diversity receiving device comprises being received in and has periodically inserted the shunt more than 2 that disperses the frequency division multiplex signal of payload signal on a plurality of carrier waves, possesses:
Time shaft interpolation and frequency axis interpolation by above-mentioned dispersion payload signal are obtained the transmission line property of each carrier wave, and calculate each power calculation unit along separate routes of the transmission line property power of each carrier wave;
Each the 1st average power along separate routes of using the output of above-mentioned power calculation unit to calculate the average power PA that diversity uses is calculated unit;
Each the 2nd average power along separate routes of using the output of above-mentioned power calculation unit to calculate the average power PB that Veterbi decoding uses is calculated unit;
With the fiducial value Ao that is set arbitrarily is benchmark each the 1st Calculation of Reliability unit along separate routes from transmission line property power calculation the 1st reliability value of above-mentioned each carrier wave;
With above-mentioned average power PB is benchmark each the 2nd Calculation of Reliability unit along separate routes from the 2nd reliability value of each carrier wave of transmission line property power calculation of above-mentioned each carrier wave;
According to each above-mentioned the 1st reliability value along separate routes, carry out the selection or the synthetic carrier diversity unit of weighting of each carrier wave;
According to each above-mentioned the 1st reliability value along separate routes, above-mentioned the 2nd reliability value is selected or synthetic, calculate the reliability value diversity unit of the 3rd new reliability value; And
To the output of above-mentioned carrier diversity unit according to above-mentioned the 3rd reliability value weighting and carry out the Veterbi decoding unit of optimal solution sign indicating number.
31. diversity receiving device according to claim 30 is characterized in that:
Above-mentioned the 2nd average power is calculated the unit, by the short time is on average calculated average power PB arbitrarily.
32. a diversity receiving method is used for being received in the shunt more than 2 of the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, comprising:
The AGC signal of the gain of the tuner of the above-mentioned frequency division multiplex signal of output control reception in each shunt;
In each shunt, above-mentioned frequency division multiplex signal is carried out detection;
In each shunt, utilize fast Fourier transform that above-mentioned detection output is carried out conversion from time domain to frequency domain;
The balanced resulting carrier wave that comprises payload signal of above-mentioned fast Fourier transform that utilizes in each shunt;
In each shunt, calculate the reliability value of each carrier wave from above-mentioned payload signal;
Each along separate routes on based on the above-mentioned reliability value of above-mentioned AGC signal correction; And
According to above-mentioned reliability value of proofreading and correct, to carrier wave select or weighting synthetic.
33. a diversity receiving method is used for being received in the shunt more than 2 of the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, comprising:
The AGC signal of the gain of the tuner of the above-mentioned frequency division multiplex signal of output control reception in each shunt;
In each shunt, above-mentioned frequency division multiplex signal is carried out detection;
In each shunt, utilize fast Fourier transform that above-mentioned detection output is carried out conversion from time domain to frequency domain;
The balanced resulting carrier wave that comprises payload signal of above-mentioned fast Fourier transform that utilizes in each shunt;
In each shunt, calculate the reliability value of each carrier wave from above-mentioned payload signal;
More above-mentioned AGC signal, and judge whether comparative result is more than the threshold value;
At above-mentioned comparative result is to proofread and correct above-mentioned reliability value at each on along separate routes based on above-mentioned AGC signal under the situation more than the threshold value; And
According to above-mentioned reliability value of proofreading and correct, to carrier wave select or weighting synthetic.
34. a diversity receiving method is used for being received in the shunt more than 2 of the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, comprising:
In each shunt, above-mentioned frequency division multiplex signal is carried out detection;
In each shunt, utilize fast Fourier transform that above-mentioned detection output is carried out conversion from time domain to frequency domain;
The balanced resulting carrier wave that comprises payload signal of above-mentioned fast Fourier transform that utilizes in each shunt;
In each shunt, calculate the reliability value of each carrier wave from above-mentioned payload signal;
In each shunt, calculate the C/N value from above-mentioned balanced output;
In each shunt, proofread and correct above-mentioned reliability value with above-mentioned C/N value; And
According to above-mentioned reliability value of proofreading and correct, to carrier wave select or weighting synthetic.
35. a diversity receiving method is used for being received in the shunt more than 2 of the frequency division multiplex signal that has periodically inserted payload signal on a plurality of carrier waves, comprising:
In each shunt, above-mentioned frequency division multiplex signal is carried out detection;
In each shunt, utilize fast Fourier transform that above-mentioned detection output is carried out conversion from time domain to frequency domain;
The balanced resulting carrier wave that comprises payload signal of above-mentioned fast Fourier transform that utilizes in each shunt;
In each shunt, calculate the reliability value of each carrier wave from above-mentioned payload signal;
In each shunt, calculate the C/N value from above-mentioned balanced output;
Compare each above-mentioned C/N value along separate routes;
Judge whether above-mentioned comparative result surpasses predetermined threshold value, and surpassing under the situation of above-mentioned threshold value according to above-mentioned comparative result above-mentioned reliability value of correction in each shunt; And
According to above-mentioned reliability value of proofreading and correct, to carrier wave select or weighting synthetic.
36. a diversity receiving method is used for being received in and has periodically inserted the shunt more than 2 that disperses the frequency division multiplex signal of payload signal on a plurality of carrier waves, comprising:
Time shaft interpolation and frequency axis interpolation by above-mentioned dispersion payload signal are obtained the transmission line property of each carrier wave, and calculate the transmission line property power of each carrier wave;
In each shunt, calculate the average power PA that diversity is used;
In each shunt, calculate the average power PB that Veterbi decoding is used;
Is benchmark 1st reliability value from transmission line property power calculation each carrier wave of above-mentioned each carrier wave with above-mentioned average power PA at each on along separate routes;
Is benchmark 2nd reliability value from transmission line property power calculation each carrier wave of above-mentioned each carrier wave with above-mentioned average power PB at each on along separate routes;
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, selection or the weighting of carrying out each carrier wave are synthetic;
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, above-mentioned the 2nd reliability value is selected or synthetic, calculate the 3rd new reliability value; And
To the synthetic carrier wave of above-mentioned selected or weighting according to above-mentioned the 3rd reliability value weighting and carry out the optimal solution sign indicating number.
37. a diversity receiving method is used for being received in and has periodically inserted the shunt more than 2 that disperses the frequency division multiplex signal of payload signal on a plurality of carrier waves, comprising:
Time shaft interpolation and frequency axis interpolation by above-mentioned dispersion payload signal are obtained the transmission line property of each carrier wave, and calculate the transmission line property power of each carrier wave;
In each shunt, at random set the fiducial value Ao that diversity is used;
In each shunt, calculate the average power PB that Veterbi decoding is used;
Is benchmark 1st reliability value from transmission line property power calculation each carrier wave of above-mentioned each carrier wave with above-mentioned fiducial value Ao at each on along separate routes;
Is benchmark 2nd reliability value from transmission line property power calculation each carrier wave of above-mentioned each carrier wave with above-mentioned average power PB at each on along separate routes;
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, selection or the weighting of carrying out each carrier wave are synthetic;
According to above-mentioned each above-mentioned the 1st reliability value along separate routes, above-mentioned the 2nd reliability value is selected or synthetic, calculate the 3rd new reliability value; And
To the synthetic carrier wave of above-mentioned selected or weighting according to above-mentioned the 3rd reliability value weighting and carry out the optimal solution sign indicating number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101006492A CN1497867A (en) | 2002-10-11 | 2003-10-10 | Diversity receiver and diversity receiving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP298419/2002 | 2002-10-11 | ||
| JP333207/2002 | 2002-11-18 | ||
| CNA2003101006492A CN1497867A (en) | 2002-10-11 | 2003-10-10 | Diversity receiver and diversity receiving method |
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| CN1497867A true CN1497867A (en) | 2004-05-19 |
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| CNA2003101006492A Pending CN1497867A (en) | 2002-10-11 | 2003-10-10 | Diversity receiver and diversity receiving method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102014088A (en) * | 2010-11-24 | 2011-04-13 | 信源通科技（西安）有限公司 | Method for assisting channel equalization by using automatic gain control (AGC) adjustment factors |
| CN101138178B (en) * | 2005-03-09 | 2011-04-20 | 株式会社巨晶片 | OFDM diversity receiving device |
| CN101485109B (en) * | 2006-07-12 | 2013-01-23 | 松下电器产业株式会社 | Diversity receiver apparatus and diversity reception method |
| CN103250384A (en) * | 2010-12-24 | 2013-08-14 | 三菱电机株式会社 | Reception device and method |
| CN107688134A (en) * | 2017-07-03 | 2018-02-13 | 临沂大学 | Distribution network failure indicator |
| CN112363188A (en) * | 2020-10-13 | 2021-02-12 | 无锡卡尔曼导航技术有限公司 | Tracking loop method and device for multi-diversity satellite navigation receiver |
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2003
- 2003-10-10 CN CNA2003101006492A patent/CN1497867A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101138178B (en) * | 2005-03-09 | 2011-04-20 | 株式会社巨晶片 | OFDM diversity receiving device |
| CN101485109B (en) * | 2006-07-12 | 2013-01-23 | 松下电器产业株式会社 | Diversity receiver apparatus and diversity reception method |
| CN102014088A (en) * | 2010-11-24 | 2011-04-13 | 信源通科技（西安）有限公司 | Method for assisting channel equalization by using automatic gain control (AGC) adjustment factors |
| CN103250384A (en) * | 2010-12-24 | 2013-08-14 | 三菱电机株式会社 | Reception device and method |
| CN103250384B (en) * | 2010-12-24 | 2015-10-21 | 三菱电机株式会社 | Receiving system and method |
| CN107688134A (en) * | 2017-07-03 | 2018-02-13 | 临沂大学 | Distribution network failure indicator |
| CN112363188A (en) * | 2020-10-13 | 2021-02-12 | 无锡卡尔曼导航技术有限公司 | Tracking loop method and device for multi-diversity satellite navigation receiver |
| CN112363188B (en) * | 2020-10-13 | 2021-06-11 | 无锡卡尔曼导航技术有限公司 | Tracking loop method and device for multi-diversity satellite navigation receiver |
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