CN1305277A - Quadrature frequency division multiplex diversing receiver - Google Patents
Quadrature frequency division multiplex diversing receiver Download PDFInfo
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- CN1305277A CN1305277A CN 00118601 CN00118601A CN1305277A CN 1305277 A CN1305277 A CN 1305277A CN 00118601 CN00118601 CN 00118601 CN 00118601 A CN00118601 A CN 00118601A CN 1305277 A CN1305277 A CN 1305277A
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Abstract
To provide an OFDM diversity receiver that can effectively conducts diversity so as to enhance error correction characteristic even when a specific carrier receives interference. SOLUTION: Reliability information calculation circuits 18, 26 discriminate the presence of interference caused on demodulated data for every carrier in each reception system, obtain the reliability of each of the demodulated data on the basis of the result of discrimination and provide a weight to each of the demodulated data on the bases of the reliability so as to eliminate the demodulated data of a carrier interfered by a frequency selection interference at diversity synthesis by a synthesis diversity circuit 28 thereby enhancing an error transmission characteristic by an error correction circuit 29. Furthermore, diversity synthesis is applied also to reliability information by each carrier of each reception system and the result is fed to the error correction 29 for missing correction so as to attain much mort effectiveness.
Description
The present invention relates to OFDM (Orthodoxy Frequency Division Multiplex) diversity receiver, it uses two or more ofdm demodulators to carry out diversity receptions based on carrier wave in turn.
In recent years, carry out the research of digitization of terrestrial television broadcasts widely.Europe and Japan have determined to adopt the transmission system of Orthodoxy Frequency Division Multiplex (OFDM hereinafter referred to as) system as Digital Terrestrial Television Broadcast.In Europe, the Digital Terrestrial Television Broadcast system has also been reached the level of actual use by standardization especially.Ofdm system is suitable for being used for sending broadband signal by making of many quadrature carriers, thereby the ability characteristics that improves delay and multiplex interference characteristic is provided, and this multiplex interference characteristic is the basic transmission conditions of ground TV broadcast.In addition, on two or more carrier waves, transmit, so by the combination error correction, known ofdm system shows outstanding transmission characteristic and avoids the influence of distortion of frequency-selecting transmission channel such as multipath distortion owing to send data.
In DTB Digital Terrestrial Broadcasting,, the diversity reception of carrier wave has been proposed in order further to improve at abominable condition of acceptance as moving the transmission characteristic under the situation about receiving.Receive for combining diversity, typically for diversity reception, the restituted signal that obtains from two ofdm demodulators is combined based on carrier wave in turn according to the power that is received usually.In this case, because two transmission channel responses are different, can greatly improve the distortion of frequency-selecting transmission channel.In addition, also can improve the time dependent decay that occurs when receiving moving.Selective diversity reception for the signal of selecting big received power is same, and is poor although its characteristic receives than combining diversity.
Yet, use the amplitude of received power as the estimation index that is used for making up or being used for making one's options from two or more restituted signals based on the OFDM receiver of the routine of known technology.In the situation that characteristic frequency stands to disturb, the signal of big received power does not always have the good quality of reception.
For example, be mixed with in the situation of analog tv broadcast signal in the digital TV broadcast signal band based on OFDM, its video carrier or sound carrier signal can be caused distortion by specific OFDM carrier signal interference.In this case, the received power of carrier signal will increase.For the conventional diversity reception of this ofdm signal with distortion carrier signal, on the basis of distortion carrier signal, carry out overall error correction, cause the decline of error correction characteristic.
The purpose of this invention is to provide a kind of OFDM diversity receiver, even under the situation that the specific carriers signal stands to disturb, thereby it also allows to carry out effective diversity reception and improves error correction characteristic.
In order to realize purpose of the present invention, a kind of OFDM diversity receiver is provided, it comprises the OFDM reception/demodulating equipment in each that is located at two or more receiving systems, be used for receiving successively ofdm signal, the signal that receives is transformed to frequency domain taking out each carrier signal from time-domain, and demodulation is assigned to the information of each carrier signal; And receive the demodulating information of each carrier signal and carry out the diversity processing unit that diversity is handled based on carrier wave in turn, it is characterized in that also comprising: reliability information obtains device, be used for the interference level that the demodulating information of each carrier signal of obtaining by OFDM reception/demodulating equipment in each receiving system stands and decision making, and on the result of determination basis, determine the information of the reliability measurement of expression restituted signal; And the diversity processing control apparatus, the reliability information that is used to respond each receiving system obtains reliability information that device determines and limits by the diversity processing unit diversity of the demodulating information of the carrier signal that stands to disturb is handled.
In above-mentioned structure,, determine the reliability of demodulating information from result of determination owing to make the judgement of the interference level that the demodulating information that takes out by each carrier signal from each receiving system stands.Use the reliability information that produces to handle the carrier signal that stands to disturb with restriction with the diversity of control demodulating information.Therefore, by from because the demodulating information of the carrier signal of the distortion due to the removal frequency-selecting interference is carried out diversity reception, cause the improvement of error correction characteristic.
Fig. 1 is the block diagram according to the OFDM receiver of first embodiment of the invention;
Fig. 2 is the block diagram of the deviation detector of Fig. 1;
Fig. 3 A and 3B are used for the figure of operating instruction that first embodiment uses the Interference Detection of deviation:
Fig. 4 is the block diagram according to the OFDM receiver of second embodiment of the invention;
Fig. 5 is the block diagram according to the OFDM receiver of third embodiment of the invention;
Fig. 6 is the block diagram according to the OFDM receiver of fourth embodiment of the invention: and
Fig. 7 A and 7B represent the received power and the frequency of the signal that receives by two transmission channels in the carrier diversity in turn based on OFDM.
With reference now to Fig. 1,, with the formal specification OFDM diversity receiver of block diagram, it makes up the demodulated output signal of first and second receiving systems of each carrier wave.
In first receiving system shown in Fig. 1, receive ofdm modulation signal and then it is provided in the tuner 12 given channel signal of selection in tuner 12 by antenna 11.Convert this channel signal to digital signal by an analog to digital (A/D) transducer 13 then.The output signal of A/D converter 13 is provided in AGC (automatic gain control) circuit 14, its output from A/D converter detects the output level of tuner and then a gain-controlled voltage is provided to the tuner, thereby its output level is remained on a preset level.
The output signal of A/D converter 13 is converted into compound baseband signal by IQ demodulator 15, and it is provided in FFT (fast fourier transform) circuit 16 successively.Fft circuit transforms to frequency domain with ofdm modulation signal from time-domain.That is to say that the amplitude and the phase place of each carrier signal represented in the output of fft circuit.
The output of fft circuit 16 is provided in the demodulator circuit 17, and it responds by the transmission channel of estimating each carrier wave and carries out demodulation.Form in carrier modulation is under the situation of differential modulated, carries out this estimation by using in each carrier wave corresponding to the data of the symbol of having handled before the symbol that is untreated.On the other hand, be under the situation of QAM (quadrature amplitude modulation) in the form of modulating, use to be multiplexed as the pilot signal that sends signal.Thereby the OFDM carrier data is by demodulation.
Specifically being configured among Fig. 2 of deviation detection circuit 182 illustrates.Respectively I and Q data are provided among hard decision circuit A1 and the A3.In each decision circuit, definite from the nearest reference point of acceptance point.The input and output of each hard decision circuit A1 and A3 are provided among a corresponding difference circuit A2 and the A4, thereby detect the difference of each I and Q data and reference point.The output of difference circuit A2 and A4 is provided among the quadratic sum circuit A5, obtains the quadratic sum of input difference signal there.The output of quadratic sum circuit is provided among the integrating circuit A6, there the quadratic sum signal of each carrier wave of integration (that is, average).Thereby, obtain the deviation of each carrier wave.
The output of deviation detection circuit 182 is threshold calculations circuit 183 and threshold determination circuit 184 along separate routes.Threshold calculations circuit 183 calculates and is used for the threshold value of the deviation of each carrier signal being decision making according to the mean value of the deviation of all carrier signals.The output of threshold calculations circuit is provided in the threshold determination circuit 184, and whether its deviation for each carrier signal is greater than or less than this threshold value is decision making.When the deviation of carrier signal during greater than this threshold value, decision circuit judges that carrier signal is just standing to disturb.
Fig. 3 A represents that the undesirable interference signal of wherein frequency-selecting is blended in the state in the band of ofdm signal, and Fig. 3 B represents the decision threshold determined from the mean value of carrier signal deviation.As shown in Fig. 3 A, noise is evenly distributed on the ofdm signal.When the incoming level of ofdm signal was enough high, even comprised noise, deviation also was no more than the decision threshold shown in Fig. 3 B.On the other hand, if the undesirable signal of frequency-selecting is blended in the band of the ofdm signal shown in Fig. 3 B, the deviation of characteristic frequency will be very big, and it surpasses decision threshold.Threshold determination circuit 184 definite carrier signals that surpass the frequency at threshold value place and determine corresponding to described frequency are just standing to disturb.
The result of determination of threshold determination circuit 184 is provided in the correcting circuit 185, and the received power of the carrier signal that it will stand to disturb is corrected to zero.Therefore, the reliability information of each carrier signal is represented in the output of correcting circuit 185, and this carrier signal comprises the result of determination that whether stands to disturb for carrier signal.
On the other hand, in second receiving system shown in Fig. 1, the ofdm signal that receives by antenna 19 is provided to be transferred to first receiving system to have in the tuner 20 of same channel, and then be provided in A/D converter 21, agc circuit 22, IQ demodulator circuit 23, fft circuit 24 and the demodulator circuit 25, thereby information from each carrier signal by demodulation and be provided to the reliability information counting circuit 26, as in first receiving system.Compare with the reliability information counting circuit 18 in first receiving system, reliability information counting circuit 26 is made up of power detector 261, deviation detector 262, threshold calculations circuit 263, threshold determination circuit 264 and correcting circuit 265, and produces the carrier wave reliability information from the demodulating information of each carrier signal.
Reliability information testing circuit 18 and 26 output are provided in the weight coefficient counting circuit 27, and it is made comparisons to calculate the weight coefficient of each receiving system for the reliability information between first and second receiving systems.When carrier signal stood to disturb in a receiving system, reliability information was zero.As a result, the weight coefficient that stands the receiving system disturbed is changed to zero.When the reliability information of first and second receiving systems all was zero, weight coefficient was meaningless.In this case, first and second receiving systems are all exported weight coefficient 0.
The weight coefficient of the corresponding receiving system of determining by weight coefficient counting circuit 27 is provided in the combining diversity circuit 28.In this circuit, by finishing the combination of the demodulating information of carrier signal from the first weighted solution adjusting information of first and second receiving systems by the respective weight coefficient in multiplier 281 and the multiplier 282, and in adder 283 the combined weighted demodulating information.In this case, when a receiving system stood to disturb, corresponding weight coefficient was changed to zero, thereby allows combining diversity and interference-free influence.By using multiplier 284 and multiplier 285 and adder 286, the reliability information of carrier signal also is combined.That is to say that reliability information can be combined and interference-free influence, a receiving system stands described interference as in the combined situation of demodulating information.When first and second receiving systems all stood to disturb, the reliability information after the combination was zero, allowed error correction circuit 29 subsequently to eliminate two demodulating informations.
The demodulating information of carrier signal and the reliability information that is obtained by combining diversity circuit 28 are provided in the error correction circuit 29, thereby carry out error correction and obtain reception information.
As mentioned above, present embodiment allows by the carrier combination diversity, not noisy adverse effect and be used for the adverse effect of combination of reliability information of the carrier wave of error correction subsequently in error correction circuit 29.Therefore, in diversity reception, also can improve error correction characteristic by dependability information.
In first embodiment shown in Fig. 1, not only demodulating information but also reliability information and weighted array.For the reliability information of first and second receiving systems, one with higher value can be used and have identical result.
In Fig. 4, with the formal specification of block diagram according to the OFDM diversity receiver of second embodiment of the invention, it exports the diversity reception selectively of carrying out carrier wave by the demodulation of using first and second receiving systems.In Fig. 4, also the descriptions thereof are omitted for corresponding parts among the Fig. 1 that is denoted by the same reference numerals.
Reliability information testing circuit 18 and 26 output are provided in the comparator 30, and it is made comparisons to be provided for selecting the control signal of the bigger receiving system of reliability information for the reliability information between first and second receiving systems of each carrier signal.When one of first and second receiving systems stood to disturb, its reliability information was changed to zero; Thereby another receiving system that selection does not stand to disturb.When the reliability information of each first and second receiving system is zero, select arbitrary receiving system.
The output of comparator 30 is provided in the selector 311 and 312 in the selective diversity circuit 31.Selector 311 by for the control signal of demodulating information that first and second receiving systems are arranged and response comparator 30 to export the demodulating information of one of first and second receiving systems selectively.Selector 312 by for the control signal of reliability information that first and second receiving systems are arranged and response comparator 30 to export the reliability information of one of first and second receiving systems selectively.
Because comparator 30 produces control signals selecting one of first and second receiving systems, and another receiving system stands to disturb, so above-mentioned structure allows selective diversity to receive and interference-free influence.When first and second receiving systems all stand to disturb, to make stipulations in error correction circuit 29, to lose correction, this is because reliability information is zero behind the selective diversity.
Therefore, second embodiment allows the carrier wave selective diversity to receive and does not have the adverse effect of carrier-in-interference, and allows to improve error correction characteristic, and this is because the carrier wave reliability information also is provided in the error correction circuit 29 selectively.Compare with the combining diversity shown in Fig. 1, although have some decay in characteristic, selective diversity has the simple advantage of circuit structure.
Fig. 5 is the block diagram of the OFDM diversity receiver of third embodiment of the invention, and its use is different from the reliability information counting circuit of first embodiment.In the figure, be denoted by the same reference numerals with Fig. 1 in corresponding parts and the descriptions thereof are omitted.
As shown in Figure 5, the threshold value that the deviation that is used for calculating in the threshold calculations circuit 183 and 263 of reliability information counting circuit 18 and 26 is judged is provided to threshold value and selects in the circuit 32, and it compares the threshold value of first and second receiving systems and exports less one selectively.Threshold determination circuit 183 in the reliability information testing circuit 18 and 26 and 263 is decision making for the deviation of each carrier wave by the threshold value of using threshold value to select circuit 32 to select.
When the reception situation worsened owing to some reasons such as antenna failure, the deviation of all carrier signals increased and is used for the also corresponding increase of threshold value that deviation is judged.The threshold value that is used for the deviation judgement is represented the average received quality of all carrier waves.Therefore, come as threshold value used in the present embodiment by select less one from the threshold value of first and second receiving systems, even the deterioration of the reception situation of one of them receiving system, that also can consider the receiving system that stands to disturb ignores it in the lump.
Fig. 6 is the block diagram of the OFDM diversity receiver of fourth embodiment of the invention, and its use is different from the reliability information counting circuit among the first and the 3rd embodiment.In the figure, be denoted by the same reference numerals with Fig. 1 in corresponding parts and the descriptions thereof are omitted.
In the first and second reliability information counting circuits 18 and 26 shown in Fig. 6, do not carry out the carrier deviation detection and do not carry out threshold calculations yet.On the contrary, each threshold determination circuit 186 and 266 is received power level and the preset threshold value by corresponding power testing circuit 181 and one of 261 each carrier wave that detects relatively, and judges that corresponding receiving system stands interference during greater than preset threshold value when received power level.
With wherein detecting first embodiment that makes determining interference and compare among Fig. 1 according to carrier deviation, the advantage that the 4th embodiment has is: although the Interference Detection precision exists some to descend, allow to use simple circuit configuration by the judgement of disturbing high level to detect.
Though third and fourth embodiment shown in Fig. 5 and 6 receives at combining diversity, principle clearly of the present invention also can be used for selective diversity and receives.
In addition, although the foregoing description is described in the diversity reception of the carrier wave of the demodulating information by using two paths or channel, clearly the present invention also can be used for the diversity reception of three or more path or channel.
In the combining diversity reception condition, can make the combinatorial optimization of demodulating information of receiving system in step by the weight coefficient that decision threshold is set in step according to interference level and receiving system is set.
The invention is not restricted to the foregoing description also can otherwise use or implement.
So far, the receiver of carrying out combination or selective diversity reception according to the power that receives with the OFDM carrier wave has been described.As seen, the frequency response of two paths or channel is different usually from Fig. 7 A and 7B.Therefore, as in the above-described embodiments, come the restituted signal of two or more paths can greatly improve the distortion of frequency-selecting transmission channel by combination or selection.In addition, also can improve the decay in time that occurs when receiving moving.
According to the present invention, provide a kind of OFDM diversity receiver as mentioned above, even under the situation that the specific carriers signal stands to disturb, thereby it also allows to carry out effectively diversity reception and improves error correction characteristic.
Claims (10)
1. OFDM diversity receiver, comprise the OFDM reception/demodulating equipment (11-17,19-25) in each that is located at two or more receiving systems, be used for receiving successively ofdm signal, the signal that receives is transformed to frequency domain from time-domain be assigned to the information of each carrier signal to take out each carrier signal and demodulation, and be used to receive the demodulating information of each carrier signal and carry out the diversity processing unit (28,31) that diversity is handled based on carrier wave in turn, it is characterized in that also comprising:
Reliability information obtains device (18,26), be used for the interference level that the demodulating information of each carrier signal of obtaining by OFDM reception/demodulating equipment (11-17,19-25) in each receiving system stands and decision making, and on the result of determination basis, determine the reliability information of the reliability measurement of expression restituted signal; And
Diversity processing control apparatus (27,281,282,284,285,30) is used to respond obtaining the diversity that reliability information that device (18,26) determines is used for controlling by diversity processing unit (28,31) demodulating information by reliability information and handling the carrier signal that stands to disturb with restriction of each receiving system.
2. according to the OFDM diversity receiver of claim 1, it is characterized in that: reliability information obtains device (18,26) comprise the OFDM reception/demodulating equipment (11-17 that is used to detect by each receiving system, 19-25) the received power test section (181 of the received power of each carrier signal of Huo Deing, 261), be used for OFDM reception/demodulating equipment (11-17 by each receiving system, 19-25) determining interference part (the 182-184 that decisions making of the interference level that stands of each carrier signal of Huo Deing, 186,262-264,266,32), and be used for according to received power test section (181,261) testing result and determining interference part (182-184,186,262-264,266,32) result of determination is come the reliability information calculating section (185 of computed reliability information, 265), wherein reliability information is represented the OFDM reception/demodulating equipment (11-17 of each receiving system, 19-25) the reliability measurement of the demodulating information of each carrier signal of Huo Deing.
3. according to the OFDM diversity receiver of claim 2, it is characterized in that: determining interference part (182-184,262-264) comprises error measuring means (182,262), and the demodulating information that is used for the carrier signal of OFDM reception/demodulating equipment (11-17, the 19-25) acquisition by each receiving system detects the deviation of each carrier signal; Threshold calculations device (183,263), the deviation that is used for each carrier signal of error measuring means (182, the 262) acquisition by each receiving system is determined a threshold value greater than unit value; And decision maker (184,264), be used for coming the interference level that each carrier signal stands is decision making by the deviation of relatively carrier signal acquisition and the threshold value of threshold calculations device (183,263) acquisition.
4. according to the OFDM diversity receiver of claim 2, it is characterized in that: determining interference part (182-184,262-264,32) comprises error measuring means (182,262), and the demodulating information that is used for the carrier signal of OFDM receptions/demodulating equipment (11-17, the 19-25) acquisition by each receiving system detects the deviation of each carrier signal; Threshold calculations device (183,263,32), the minimum average B configuration deviation that is used on average the deviation of the carrier signal that the error measuring means (182,262) by each receiving system obtain and one of receiving system is set is as the threshold value that is used for the determining interference standard; And decision maker (184,264), be used for coming the interference level that each carrier signal stands is decision making by the deviation of relatively carrier signal acquisition and the threshold value of threshold calculations device (183,263,32) setting.
5. according to the OFDM diversity receiver of claim 3 or 4, it is characterized in that: error measuring means (182,262) are by making the demodulating information of each carrier signal determine diadic (two-valued) deviation through hard decision.
6. according to the OFDM diversity receiver of claim 3 or 4, it is characterized in that: error measuring means (182,262) are by making the demodulating information of each carrier signal come deviation in the determining step through hard decision.
7. according to the OFDM diversity receiver of claim 2, it is characterized in that: the received power and a preset threshold value of the carrier signal of power detection part (181,261) detection come the interference level that each carrier signal stands is decision making determining interference part (186,266) by receiving relatively.
8. according to the OFDM diversity receiver of claim 1, it is characterized in that: diversity processing unit (28) makes up the demodulating information of OFDM reception/demodulating equipment (11-17, the 19-25) acquisition of the receiving system of each carrier signal, and diversity processing control apparatus (27,281,282,284,285) comes weighting to pass through each demodulating information of each carrier signal of diversity processing unit (283) combination according to the reliability information that reliability information obtains the carrier signal of device (18,26) acquisition.
9. according to the OFDM diversity receiver of claim 1, it is characterized in that: diversity processing unit (31) is selected from the demodulating information of OFDM reception/demodulating equipment (11-17, the 19-25) acquisition of the receiving system of each carrier signal, and diversity processing control apparatus (30) determines to pass through the selected demodulating information of diversity processing unit (312) of each carrier signal according to the reliability information of the carrier signal of reliability information acquisition device (18,26) acquisition.
10. according to the OFDM diversity receiver of claim 1, it is characterized in that also comprising error correction device (29), it is used for proofreading and correct the mistake of the demodulating information of being handled by diversity processing unit (28,31), and wherein diversity processing unit (28, the 31) reliability information that makes reliability information by receiving system obtain each carrier signal that device (18,26) obtains is handled through diversity, and error correction device (29) is proofreaied and correct demodulating information according to the reliability information of handling through diversity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34048899A JP3389178B2 (en) | 1999-11-30 | 1999-11-30 | OFDM diversity receiver |
| JP340488/1999 | 1999-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1305277A true CN1305277A (en) | 2001-07-25 |
| CN1178416C CN1178416C (en) | 2004-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001186019A Expired - Fee Related CN1178416C (en) | 1999-11-30 | 2000-06-16 | Quadrature frequency division multiplex diversing receiver |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3389178B2 (en) |
| CN (1) | CN1178416C (en) |
| SG (1) | SG115339A1 (en) |
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|---|---|---|---|---|
| CN100444537C (en) * | 2002-02-13 | 2008-12-17 | 迪康公司 | Moudel apparatus for diversity reception of modulation signal |
| CN100392999C (en) * | 2003-12-26 | 2008-06-04 | 三洋电机株式会社 | Receiving method and receiving apparatus |
| CN1700689B (en) * | 2004-05-21 | 2010-05-12 | 索尼株式会社 | Demodulating device |
| CN1878016B (en) * | 2005-06-06 | 2012-07-18 | 安德鲁有限责任公司 | De-detection composite signal method and subprocessor, wireless processor and receiver |
| US7961825B2 (en) | 2005-11-24 | 2011-06-14 | Kabushiki Kaisha Toshiba | Diversity receiver and method |
| CN1972172B (en) * | 2005-11-24 | 2012-01-18 | 株式会社东芝 | Diversity receiver and method |
| CN101083504B (en) * | 2007-07-23 | 2011-09-07 | 沖电气（新加坡）技术中心 | Demodulating equipment and its demodulating method |
| CN101933351A (en) * | 2009-04-07 | 2010-12-29 | 联发科技股份有限公司 | Mechanism of dynamic resource transaction for wireless ofdma systems |
| CN101933351B (en) * | 2009-04-07 | 2016-12-14 | 联发科技股份有限公司 | For dynamic resource transaction, provided for radio resources management and the method alleviating interference |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3389178B2 (en) | 2003-03-24 |
| JP2001156738A (en) | 2001-06-08 |
| SG115339A1 (en) | 2005-10-28 |
| CN1178416C (en) | 2004-12-01 |
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