CN102195918B - Method and device for eliminating spectrum inversion, and receiver - Google Patents
Method and device for eliminating spectrum inversion, and receiver Download PDFInfo
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- 238000001228 spectrum Methods 0.000 title claims abstract description 154
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Abstract
The invention discloses a method for eliminating spectrum inversion. The method comprises the following steps of: detecting whether a received signal has a spectrum inversion problem or not; if the received signal has the spectrum inversion problem, checking whether a frequency point index value FFT_IDX of fast Fourier transform is 0 or not; if the frequency point index value FFT_IDX is 0, adopting an orthogonal inphase frequency domain signal of the 0th sub-carrier of the received signal as an inphase orthogonal frequency domain signal of the 0th sub-carrier of an output signal; and if the frequency point index value FFT_IDX is not 0, adopting the orthogonal inphase frequency domain signal of the (N-FFT_IDX)th sub-carrier of the received signal as the inphase orthogonal frequency domain signal of the (N-FFT_IDX)th sub-carrier of the output signal, wherein N is the number of sampling points of the fast Fourier transformer, and the frequency point index value FFT_IDX is an integer ranged from 0 to N-1.
Description
Technical field
The invention relates to a kind of method of the reversing spectrum in order to cancellation receiver, and particularly relevant for a kind of use Frequency Domain Solution interleaver (FREQUENCY DE-ITERLEVER), eliminate method, its device and its receiver of reversing spectrum.
Background technology
The development of mechanics of communication is at present more and more ripe, in daily life, always carves, and all can see the communication device of any type.Receiver in communication device all has tuner (TUNER), in order to receive wireless signal or wire signal, and the reception signal in specific frequency spectrum is leached, to obtain the needed data of communication device.Yet, after reception signal is processed by tuner, receiver can sample and down-conversion (DOWN CONVERSION) to received signal, so may cause receiving the problem that signal produces reversing spectrum (I/Q SWAP), the time domain in-phase signal and the time domain orthogonal signal that namely receive in signal can exchange.
Referring to Figure 1A and 1B, Figure 1A is the schematic diagram of the frequency spectrum of primary reception signal, and Figure 1B is the schematic diagram that receives the frequency spectrum of signal after tuner and down-conversion sampling processing.From the spectrum diagram of Figure 1A and 1B, can clearly find out that receiving signal has obvious difference through the frequency spectrum after tuner and down-conversion sampling processing and the frequency spectrum of primary reception signal, and the reason of this species diversity just comes from the problem of aforementioned reversing spectrum.
Pin may produce the problem of reversing spectrum to received signal after tuner and down-conversion sampling processing, has had the mode of several solutions to be suggested at present.Most settling mode is first to carry out to received signal synchronously, and then checks that whether various indexs are normal.If various indexs are all normal, but forward error correction (FORWARD ERROR CORRECTION CODING) module but cannot correctly be decoded, receiver can be thought the problem of reversing spectrum, and can then the signal of homophase and quadrature (I/Q) passage be exchanged.Yet, in the mode of above-mentioned solution reversing spectrum, because receiver is after receiving the signal of homophase and orthogonal channel, just carry out to received signal synchronously, therefore can be extended the locking time of whole communication device.
Please refer to Fig. 2, Fig. 2 is the calcspar of traditional receiver 600.Tradition receiver 600 is the receivers for Chinese numerical digit ground multimedia broadcast (DIGITAL TERRESTRIAL MULTIMEDIABROADCASTING, referred to as DTMB) system.Receiver 600 comprises antenna 601, tuner 602, sampling and down conversion module 603, synchronization module 204, passage estimates and balance module 605, Frequency Domain Solution interleaver 606, demodulation and decoder module 607 and finite state machine 608.Antenna 601 is coupled to tuner 602, tuner 602 is coupled to sampling and down conversion module 603, sampling is coupled to synchronization module 604 with down conversion module 603, synchronization module 604 is coupled to passage and estimates and balance module 605, passage is estimated and balance module 605 is coupled to Frequency Domain Solution interleaver 606, Frequency Domain Solution interleaver 606 is coupled to demodulation and decoder module 607, and finite state machine 608 is coupled between demodulation and decoder module 607 and synchronization module 604.
Antenna 601 is used for receiving the wireless signal of radio channel, and sends the signal of reception to tuner 602.Tuner 602 is received signal and is divided into homophase and orthogonal frequency domain signal, and sends sampling and down conversion module 603 to through homophase and orthogonal channel.Sampling is received with down conversion module 603, and signal samples and the processing of down-conversion, and sends the signal after processing to synchronization module 604.The signal synchronization circuit 6041 of synchronization module 604 is in order to the positive input signal of its reception is synchronizeed with in-phase input signals for 1, and sends the positive input signal after synchronous and in-phase input signals for 1 to passage estimation and balance module 605.
Passage is estimated and balance module 605 has passage impulse response estimation unit, fast Fourier transform device and equalizer.Passage is estimated and balance module 605 can see through the channel impulse response that passage impulse response estimation unit is estimated radio channel, and through fast Fourier transform device, the channel impulse response of estimation is carried out to fast Fourier transform to obtain channel frequence response.Then, passage estimation and balance module 605 carry out channel-equalization processing through the equalizer frequency-region signal that response receives it according to channel frequence.Afterwards, passage estimation and balance module 605 can send the frequency index value FFT_IDX of the orthogonal frequency domain signal after channel-equalization is processed, homophase frequency-region signal and fast Fourier transform to Frequency Domain Solution interleaver 606.Demodulation and decoder module 607 comprise demodulator and decoder, and decoder can be for example forward error correction module.Homophase and orthogonal frequency domain signal that demodulation and decoder module 607 receive it carry out the action of demodulation and decoding, and judge whether the homophase of its reception and orthogonal frequency domain signal cannot correctly solve.
If demodulation and decoder module 607 can, correctly to the homophase of its reception and the demodulation of orthogonal frequency domain signal and decoding, represent not detect reversing spectrum.If demodulation and decoder module 607 cannot, correctly to the homophase of its reception and the demodulation of orthogonal frequency domain signal and decoding, indicate to detect reversing spectrum.More output detection signal is to finite state machine 608 for demodulation and decoder module 607, and finite state machine 608 can exchange control signal according to the status signal output of inner stored at least more than one of detection signal and its.
Synchronization module 604 is subject to coming from the exchange control signal that finite state machine 608 is exported.In the situation that not detecting reversing spectrum, exchange control signal is forbidden energy (DISABLED), now, the positive input signal of synchronization module 604 is to come from the orthogonal time-domain signal that tuner 602 is exported, and the in-phase input signals for 1 of synchronization module 604 is to come from the homophase time-domain signal that tuner 602 is exported.On the contrary, in the situation that detecting reversing spectrum, exchange control signal is activation (ENABLED), now, the positive input signal of synchronization module 604 is to come from the homophase time-domain signal that tuner 602 is exported, and the in-phase input signals for 1 of synchronization module 604 is to come from the orthogonal time-domain signal that tuner 602 is exported.In this example, synchronization module 604 there is two multiplexer MUX1 and MUX2, see through exchange control signal and control multiplexer MUX1 and MUX2, just can select positive input signal is orthogonal time-domain signal or homophase time-domain signal, and selection in-phase input signals for 1 is homophase time-domain signal or orthogonal time-domain signal.
Accordingly, traditional reversing spectrum cancellation element 610 is by having demodulation and decoder module 607, limit state machine 608 to form with synchronization module 604.When detecting the situation of reversing spectrum, because synchronization module 604 estimates with passage road and balance module 605 Output rusults change to some extent, therefore synchronization module 604 must re-synchronization its homophase receiving and positive input signal, and passage is estimated and balance module 605 also must re-start the equilibrium treatment of passage estimation and filtering interpolation.In a word, traditional receiver 600, when reversing spectrum occurs, is understood because of re-synchronization, and is caused to be extended the locking time of whole communication device.
In addition, also having some researchs and document is to see through additive method the signal of homophase and orthogonal channel is checked, to check in advance by this detection time of reversing spectrum, but adopting the receiver of the mode of these problems that solve reversing spectrum is all after the signal of homophase and orthogonal channel, just carry out to received signal synchronous.In addition, also having some to be suggested patent is to inquire into the method that detects reversing spectrum, but not solves the method for reversing spectrum.In a word, the practice of prior art is all to the signal processing of reversing, to solve the problem of reversing spectrum in time domain.
Summary of the invention
One of object of the present invention is to provide a kind of method of eliminating reversing spectrum.First, detect reception signal and whether there is reversing spectrum problem.If receive signal, there is reversing spectrum problem, check whether the frequency index value FFT_IDX of fast Fourier transform is 0.If frequency index value FFT_IDX is zero, the homophase frequency-region signal of just giving that receives the 0th subcarrier of signal is used as to homophase and the orthogonal frequency domain signal of the 0th subcarrier of output signal; If FFT_IDX is non-vanishing for frequency index value, the homophase frequency-region signal of just giving that receives (N-FFT_IDX) individual subcarrier of signal is used as to homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier of output signal.The sampling point number that wherein N is fast Fourier transform, frequency index value FFT_IDX is 0 to N-1 integer.
One of object of the present invention is to provide a kind of device of eliminating reversing spectrum, and the device of described elimination reversing spectrum comprises reversing spectrum detector and Frequency Domain Solution interleaver.Whether reversing spectrum detector has reversing spectrum problem in order to detect reception signal, and sends accordingly output control signal.Frequency Domain Solution interleaver produces memory according to output control signal and writes and read address, and write and the frequency index value FFT_IDX that reads address and fast Fourier transform according to memory, FFT_IDX the subcarrier homophase and the orthogonal frequency domain signal that receive signal are write to this Frequency Domain Solution interleaver, and this storing memory that interweaves is certainly read to FFT_IDX subcarrier homophase and the orthogonal frequency domain signal of output signal, wherein the sampling point number of fast Fourier transform is expressed as N, and FFT_IDX is 0 to N-1 integer.
One of object of the present invention is to provide a kind of receiver, and described receiver comprises passage estimation and balance module, Frequency Domain Solution interleaver and reversing spectrum detector.Passage is estimated and balance module receives signal in order to output.Frequency Domain Solution interleaver is exported control signal in order to receive, and whether has reversing spectrum problem according to output control signal judgement reception signal.If receive signal, there is this reversing spectrum problem, and the frequency index value FFT_IDX of fast fourier transform is zero, and Frequency Domain Solution interleaver is used as the homophase frequency-region signal of just giving that receives the 0th subcarrier of signal as homophase and the orthogonal frequency domain signal of the 0th subcarrier of output signal.When receiving signal, there is reversing spectrum problem, and FFT_IDX is non-vanishing for frequency index value, Frequency Domain Solution interleaver is used as the homophase frequency-region signal of just giving that receives (N-FFT_IDX) individual subcarrier of signal as homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier of output signal.The sampling point number that wherein N is fast Fourier transform, frequency index value FFT_IDX is 0 to N-1 integer.Whether reversing spectrum detector has reversing spectrum problem in order to detect reception signal, and sends accordingly output control signal.
In sum, embodiments of the invention have proposed a kind of method, its device and its receiver of eliminating reversing spectrum.Eliminating method, its device of reversing spectrum can save with its receiver the time loss that re-synchronization causes, and can be implemented in the multicarrier system with frequency-domain-interleaving module.So, can not increase under the prerequisite of cost, realize the effect of eliminating reversing spectrum.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate institute's accompanying drawing to be described in detail below.
Accompanying drawing explanation
Figure 1A is the schematic diagram of the frequency spectrum of primary reception signal;
Figure 1B is the schematic diagram that receives the frequency spectrum of signal after tuner and down-conversion sampling processing;
Fig. 1 C is the spectrum diagram of the corresponding signal of the frequency spectrum of Figure 1B after frequency-domain-interleaving device is processed;
Fig. 2 is the calcspar of traditional receiver 600;
Fig. 3 is the calcspar of the receiver 200 that provides of illustrative example of the present invention;
Fig. 4 is the calcspar of the reversing spectrum cancellation element 300 that provides of illustrative example of the present invention;
Fig. 5 is the schematic diagram of the storing memory 301 that interweaves that provides of illustrative example of the present invention;
Fig. 6 is the flow chart that embodiments of the invention of the present invention provide the method for eliminating reversing spectrum.
Main element symbol description:
600: receiver
601: antenna
602: tuner
603: sampling and down conversion module
604: synchronization module
6041: signal synchronization circuit
605: passage is estimated and balance module
606: Frequency Domain Solution interleaver
607: demodulation and decoder module
608: finite state machine
610: reversing spectrum cancellation element
MUX1, MUX2: multiplexer
200: receiver
201: antenna
202: tuner
203: sampling and down conversion module
204: signal synchronization circuit
205: passage is estimated and balance module
206: Frequency Domain Solution interleaver
207: demodulation and decoder module
208: finite state machine
250: reversing spectrum cancellation element
301: storing memory interweaves
302: memory access controller
303: memory address generator
311: passage impulse response estimation unit
312: fast Fourier transform device
313: equalizer
4000～4007: mnemon
S502～S516: steps flow chart
Embodiment
Embodiments of the invention propose a kind of method of eliminating reversing spectrum, this method of eliminating reversing spectrum be different from prior art in time domain to the signal processing of reversing, and change, adopt frequency-domain-interleaving device to the processing of reversing of the frequency spectrum of the reception signal through after tuner and down-conversion sampling processing, to obtain by this primary reception signal.Please refer to Figure 1A～1C, Fig. 1 C is the spectrum diagram of the corresponding signal of the frequency spectrum of Figure 1B after frequency-domain-interleaving device is processed.From Fig. 1 C, at frequency-domain-interleaving device, to there is the reception signal of reversing spectrum, on frequency domain, it is reversed after processing, can obtain the frequency spectrum of primary reception signal.
Suppose that receiving signal is A (t)+jB (t), the signal after tuner and down-converted can represent r
dOWN_IF_n(t), signal r wherein
dOWN_IF_n(t) be expressed as follows:
Frequency f wherein
1for the intermediate frequency after down-conversion,
for phase difference.Therefore, signal that receiver solves may be B (t)+jA (t), but not A+jB (t), that is has the problem of reversing spectrum.
Suppose to receive signal and be expressed as x (n)=A (n)+jB (n) after sampling, the frequency-region signal sampled signal being carried out after discrete fourier conversion is expressed as X (k)=DFT[x (n)]=X
r(k)+jX
i(k), X wherein
r(k) represent the real number part of frequency domain signal X (k), X
i(k) represent the imaginary part of frequency domain signal X (k).If get conjugation y (n)=x* (n)=A (n)-jB (n) of time-domain signal x (n), carry out discrete fourier conversion, the frequency-region signal after conversion is expressed as Y (k)=DFT[x* (n)]=X* (k)=X
r(N-k)-jX
i(N-k), wherein N is the sampling point number of discrete fourier conversion.When there is the problem of reversing spectrum, the reception signal that receiver solves is expressed as z (n)=B (n)+jA (n)=jy (n) after sampling, and the result that time-domain signal z (n) carries out after discrete fourier conversion is expressed as Z (k)=DFT[z (n)]=DFT[jy (n)]=jY (k)=X
i(N-k)+jX
r(N-k).
Derivation result by frequency-region signal Z (k) can learn, when there is the problem of reversing spectrum, and except the sampling point of k=0, the real number of frequency-region signal Z (k) part X
i(N-k) be the imaginary part X of frequency domain signal X (k)
i(k) result of turning right again after a displacement N sampling point after Y-axis is reversed.Similarly, except the sampling point of k=0, the imaginary part X of frequency-region signal Z (k)
r(N-k) be the real number part X of frequency domain signal X (k)
r(k) result of turning right again after a displacement N sampling point after Y-axis is reversed.As for the sampling point of k=0, the real number of frequency-region signal Z (0) part X
i(0) equal the imaginary part X of frequency domain signal X (0)
i(0), the imaginary part X of frequency-region signal Z (0)
r(0) equal the real number part X of frequency domain signal X (0)
r(0).See through above-mentioned result, when there is the problem of reversing spectrum, can the reception signal that produce reversing spectrum be reverted back to primary reception signal with frequency-domain-interleaving device.
Please refer to Fig. 3, Fig. 3 is the calcspar of the receiver 200 that provides of embodiments of the invention.As shown in Figure 3, receiver 200 comprises antenna 201, tuner 202, sampling and down conversion module 203, signal synchronization circuit 204, passage estimates and balance module 205, Frequency Domain Solution interleaver 206, demodulation and decoder module 207 and finite state machine 208.Antenna 201 is coupled to tuner 202, tuner 202 is coupled to sampling and down conversion module 203, sampling is coupled to signal synchronization circuit 204 with down conversion module 203, signal synchronization circuit 204 is coupled to passage and estimates and balance module 205, passage is estimated and balance module 205 is coupled to Frequency Domain Solution interleaver 206, Frequency Domain Solution interleaver 206 is coupled to demodulation and decoder module 207, and finite state machine 208 is coupled between demodulation and decoder module 207 and Frequency Domain Solution interleaver 206.Frequency Domain Solution interleaver 206, demodulation and decoder module 207 form reversing spectrum cancellation element 250 with finite state machine 208.
Antenna 201 is used for receiving the wireless signal of radio channel, and sends the signal of reception to tuner 202.Tuner 202 is received signal and is divided into homophase and orthogonal time-domain signal, and sends sampling and down conversion module 203 to through homophase and orthogonal channel.Sampling is received with down conversion module 203, and signal samples and the processing of down-conversion, and sends the signal after processing to signal synchronization circuit 204.Signal synchronization circuit 204 is in order to the action of synchronizeing through the reception signal of sampling with down-converted after, and sends the reception signal after synchronous to passage estimation and balance module 205.
Passage is estimated and balance module 205 has passage impulse response estimation unit, fast Fourier transform device and equalizer.Passage impulse response estimation unit is estimated the passage impulse response of radio channel, and fast Fourier transform device carries out fast Fourier transform to obtain channel frequence response by the channel impulse response of estimation.Then, the equalizer frequency-region signal that response receives it according to channel frequence carries out channel-equalization processing.Afterwards, passage estimation and balance module 205 can send the frequency index value FFT IDX of the homophase frequency-region signal after channel-equalization is processed, orthogonal frequency domain signal and fast Fourier transform to Frequency Domain Solution interleaver 206.
When the problem of reversing spectrum does not occur, Frequency Domain Solution interleaver 206 can directly be exported to demodulation and decoder module 207 by homophase and orthogonal frequency domain signal.When the problem of reversing spectrum occurs, Frequency Domain Solution interleaver 206 can receive signal to it carry out reversing spectrum processing, and the homophase of output after reversing spectrum is processed and orthogonal frequency domain signal are to demodulation and decoder module 207.Furthermore, when the problem of reversing spectrum occurs, if not receiving signal to it, Frequency Domain Solution interleaver 206 carries out reversing spectrum processing, demodulation and decoder module 207 cannot be decoded to homophase frequency-region signal, orthogonal frequency domain signal smoothly, now, demodulation and decoder module 207 meeting output detection signals are to finite state machine 208.Finite state machine 208 is sent output control signal to Frequency Domain Solution interleaver 206 according to detection signal.
When the activation of output control signal, Frequency Domain Solution interleaver 206 is when the homophase frequency-region signal output for k subcarrier by the orthogonal frequency domain signal of original N-k subcarrier, the homophase frequency-region signal of original N-k subcarrier is used as to the orthogonal frequency domain signal output of k subcarrier, the orthogonal frequency domain signal of original the 0th subcarrier is used as to the homophase frequency-region signal output of the 0th subcarrier, and the orthogonal frequency domain signal output of the homophase frequency-region signal of original the 0th subcarrier being used as to the 0th subcarrier, wherein k equals 1 to N-1.
When output control signal forbidden energy, Frequency Domain Solution interleaver 206 is when the orthogonal frequency domain signal output for k subcarrier by the orthogonal frequency domain signal of original k subcarrier, the homophase frequency-region signal of original k subcarrier is used as to the homophase frequency-region signal output of k subcarrier, the orthogonal frequency domain signal of original the 0th subcarrier is used as to the orthogonal frequency domain signal output of the 0th subcarrier, and the homophase frequency-region signal output of the homophase frequency-region signal of original the 0th subcarrier being used as to the 0th subcarrier, wherein k equals 1 to N-1.
Demodulation and decoder module 207 can have forward error correction module, and forward error correction module can be carried out error correction decoding to the homophase after its demodulation and orthogonal frequency domain signal, and judge whether homophase and orthogonal frequency domain signal after demodulation cannot correctly be corrected.If homophase and orthogonal frequency domain signal cannot correctly demodulatedly be corrected with decoder module 207, and other various indexs are all normal, representing to receive signal has the problem of reversing spectrum to exist, and now demodulation and decoder module 207 can send the detection signal of activation to finite state machine 208.On the contrary, if the homophase after demodulation and orthogonal frequency domain signal can correctly demodulatedly be corrected with forward error correction module decoder module 207, represent to receive the problem that signal does not have reversing spectrum, now demodulation and decoder module 207 can send the detection signal of forbidden energy to finite state machine 208, make finite state machine 208 indication Frequency Domain Solution interleavers 206 directly by received homophase and the output of orthogonal frequency domain signal, and do not carry out reversing spectrum processing.
It should be noted that, above-mentioned receiver 200 is when processing the problem of reversing spectrum, do not need to allow its signal synchronization circuit 204 carry out re-synchronization, therefore can save the time loss that re-synchronization causes, and be conducive to receiver 200, carry out to received signal the action of Fast synchronization.In addition, because the receiver overwhelming majority of existing multicarrier system has Frequency Domain Solution interleaver, therefore above-mentioned homophase and orthogonal frequency domain letter are carried out to the action of frequency spectrum reverse process, also may be implemented on for example deinterleaver of balance controller, forward error correction module.In other words, as long as can determine the frequency index value of fast Fourier transform, all can not increase under the prerequisite of great amount of cost, complete homophase and orthogonal frequency domain letter are carried out to the action of frequency spectrum reverse process.For instance, the receiver of China numerical digit ground multimedia broadcast system institute standard itself has frequency-domain-interleaving device, therefore, can modify to the frequency-domain-interleaving device of this receiver itself, make it when having the problem of reversing spectrum, can carry out frequency spectrum reverse process to homophase and orthogonal frequency domain letter.In addition, the above embodiments be using demodulation and decoder module 207 with finite state machine 208 as detecting the reversing spectrum detector whether reversing spectrum occurs, when in fact, also have a lot of prior arts to adopt other modules and circuit to be used as reversing spectrum detector, therefore, the relevant reversing spectrum detector of the present invention and detection method thereof are not in order to limit the present invention.
Then, please refer to Fig. 4, Fig. 4 is the calcspar of the reversing spectrum cancellation element 250 that provides of embodiments of the invention.Reversing spectrum cancellation element 250 herein comprises Frequency Domain Solution interleaver 206, demodulation and decoder module 207 and finite state machine 208, but the present invention is not limited with this embodiment.As shown in Figure 3, Frequency Domain Solution interleaver 206 itself comprises deinterleaving storing memory 301, memory access controller 302 and memory address generator 303.Reversing spectrum cancellation element 250 is coupled to passage to be estimated and balance module 205, and it is estimated and balance module 205 comprises passage impulse response estimation unit 311, fast Fourier transform device 312 and equalizer 313, but the present invention is not limited with this embodiment.The storing memory 301 that interweaves is coupled to memory access controller 302, memory access controller 302 is coupled to memory address generator 303, passage is estimated and balance module 205 and demodulation and decoder module 207, and finite state machine 208 is coupled to memory address generator 303 and demodulation and decoder module 207.Demodulation and decoder module 207 have formed reversing spectrum detector 340 with finite state machine 208, but as described earlier, the execution mode of reversing spectrum detector 340 is not limited with the combination of finite state machine 208 with demodulation and decoder module 207.
The frequency index value FFT_IDX that passage is estimated and balance module 205 can be exported homophase frequency-region signal, orthogonal frequency domain signal and fast Fourier transform is to memory access controller 302.Memory address generator 303 can produce and write and read memory address according to the output control signal of finite state machine output, when the activation of output control signal, the problem that indicates reversing spectrum, the read memory address that now memory address generator 303 produces can with do not have reversing spectrum problem time the read memory address that produces different.
Memory access controller 302 can read from the storing memory 301 that interweaves the interweave stored homophase of storing memory 301 and orthogonal frequency domain signal according to the frequency index value FFT_IDX with fast Fourier transform and read memory address, and homophase and orthogonal frequency domain signal are delivered to demodulation and decoder module 207.Memory access controller 302 also according to the frequency index value FFT_IDX of write memory address and fast Fourier transform, will come from passage estimation and balance module 205 is stored to the storing memory 301 that interweaves.
Finite state machine 208 is received in the detection signal that comes from demodulation and decoder module 207, when detection signal activation, represents that demodulation and decoder module 207 cannot successfully decode to received signal.Finite state machine 208 can have several states, and the level of the output control signal of its next state and output is to decide according to its current state and detection signal.When the current state of finite state machine 208 shows demodulation and decoder module 207, repeatedly cannot successfully decode to received signal, and this detection signal is while being activation again, the output control signal that finite state machine 208 state machines are exported is activation.
Please refer to Fig. 5, Fig. 5 is the schematic diagram of the storing memory 301 that interweaves that provides of embodiments of the invention.The storing memory 301 that interweaves has 2N mnemon, and each mnemon can record homophase or the orthogonal frequency domain signal of a subcarrier, and for example mnemon 4000 and 4001 can be in order to store homophase and the orthogonal frequency domain signal of a subcarrier.The embodiment that the N of take is below 4 illustrates, N value can change according to different demands and system certainly, and N value is not in order to limit the present invention.
When the problem of reversing spectrum does not occur, read memory address and write memory address that memory address generator 303 produces are mutually the same.First, memory access controller 302 can write to mnemon 4000 by the homophase frequency-region signal of the 0th subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4001 by the orthogonal frequency domain signal of the 0th subcarrier according to write memory address.Then, memory access controller 302 can write to mnemon 4002 by the homophase frequency-region signal of the 1st subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4003 by the orthogonal frequency domain signal of the 1st subcarrier according to write memory address.
Then, memory access controller 302 can write to mnemon 4004 by the homophase frequency-region signal of the 2nd subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4005 by the orthogonal frequency domain signal of the 2nd subcarrier according to write memory address.Then, memory access controller 302 can write to mnemon 4006 by the homophase frequency-region signal of the 3rd subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4007 by the orthogonal frequency domain signal of the 3rd subcarrier according to write memory address.
After the homophase of the 0th to the 3rd subcarrier and orthogonal frequency domain signal all write to the storing memory 301 that interweaves, memory access controller 302 can will read out the stored content of mnemon 4000 according to read memory address, as the homophase frequency-region signal of the 0th subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4001 according to read memory address, as the orthogonal frequency domain signal of the 0th subcarrier, delivers to demodulation and decoder module 207.Then, memory access controller 302 can will read out the stored content of mnemon 4002 according to read memory address, as the homophase frequency-region signal of the 1st subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4003 according to read memory address, as the orthogonal frequency domain signal of the 1st subcarrier, delivers to demodulation and decoder module 207.
Then, memory access controller 302 can will read out the stored content of mnemon 4004 according to read memory address, as the homophase frequency-region signal of the 2nd subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4005 according to read memory address, as the orthogonal frequency domain signal of the 2nd subcarrier, delivers to demodulation and decoder module 207.Then, memory access controller 302 can will read out the stored content of mnemon 4006 according to read memory address, as the homophase frequency-region signal of the 3rd subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4007 according to read memory address, as the orthogonal frequency domain signal of the 3rd subcarrier, delivers to demodulation and decoder module 207.
When the problem of reversing spectrum occurs, read memory address and write memory address that memory address generator 303 produces are differing from each other.Now, memory access controller 302 can write to mnemon 4001 by the homophase frequency-region signal of the 0th subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4000 by the orthogonal frequency domain signal of the 0th subcarrier according to write memory address.Then, memory access controller 302 can write to mnemon 4007 by the homophase frequency-region signal of the 1st subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4006 by the orthogonal frequency domain signal of the 1st subcarrier according to write memory address.
Then, memory access controller 302 can write to mnemon 4005 by the homophase frequency-region signal of the 2nd subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4004 by the orthogonal frequency domain signal of the 2nd subcarrier according to write memory address.Then, memory access controller 302 can write to mnemon 4003 by the homophase frequency-region signal of the 3rd subcarrier according to write memory address, then, memory access controller 302 can write to mnemon 4002 by the orthogonal frequency domain signal of the 3rd subcarrier according to write memory address.
After the homophase of the 0th to the 3rd subcarrier and orthogonal frequency domain signal all write to the storing memory 301 that interweaves, the reading manner that memory access controller 302 reads the stored content of storing memory 30 that interweaves is identical with the reading manner of problem that reversing spectrum does not occur, and at this, does not just repeat.Thus, in the situation that FFT_IDX equals 0, that exports to the homophase of the 0th subcarrier of demodulation and decoder module 207 and the 0th subcarrier that orthogonal frequency domain signal is respectively former reception signal just gives homophase frequency-region signal; And in the situation that FFT_IDX is not 0, that exports to the homophase of FFT_IDX subcarrier of demodulation and decoder module 207 and (N-FFT_IDX) individual subcarrier that orthogonal frequency domain signal is respectively former reception signal just gives homophase frequency-region signal.
It should be noted that, the calcspar of above-mentioned reversing spectrum cancellation element 300, is only the wherein a kind of embodiment that implements reversing spectrum cancellation element, and it is not in order to limit the present invention.In another embodiment, passage is estimated and the frequency index value FFT_IDX of the fast Fourier transform that balance module 205 is exported is stored device address generator 303 to receive, and be not stored device access controller 302, receives.In addition, demodulation and decoder module 207 have formed reversing spectrum detector with finite state machine 208, and described finite state machine 208 can also be realized by usage counter.In addition, the execution mode of aforementioned reversing spectrum detector is not in order to limit the present invention, and aforementioned reversing spectrum detector also detects by other modes the reversing spectrum detector that whether has reversing spectrum problem to produce.
In addition, it should be noted that in addition, though the above embodiments are can be changed to some extent example because reversing spectrum whether occurs with write memory address, in another embodiment, can also can be changed to some extent because reversing spectrum whether occurs example by read memory address.Below introduce the embodiment that can change to some extent because reversing spectrum whether occurs with read memory address.
When the problem of reversing spectrum does not occur, memory access controller 302 accesses the reading of the stored content of storing memory 30 that interweave is identical with reading with writing mode of the problem that reversing spectrum does not occur in writing mode and previous example, and at this, just repeats no more.When the problem of reversing spectrum occurs, read memory address and write memory address that memory address generator 303 produces are differing from each other.Now, it is identical with the writing mode of the problem that reversing spectrum does not occur in previous example that memory access controller 302 writes the writing mode of the stored content of storing memory 30 that interweaves, and at this, just repeats no more.
After the homophase of the 0th to the 3rd subcarrier and orthogonal frequency domain signal all write to the storing memory 301 that interweaves, memory access controller 302 can will read out the stored content of mnemon 4001 according to read memory address, as the homophase frequency-region signal of the 0th subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4000 according to read memory address, as the orthogonal frequency domain signal of the 0th subcarrier, delivers to demodulation and decoder module 207.Then, memory access controller 302 can will read out the stored content of mnemon 4007 according to read memory address, as the homophase frequency-region signal of the 1st subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4006 according to read memory address, as the orthogonal frequency domain signal of the 1st subcarrier, delivers to demodulation and decoder module 207.
Then, memory access controller 302 can will read out the stored content of mnemon 4005 according to read memory address, as the homophase frequency-region signal of the 2nd subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4004 according to read memory address, as the orthogonal frequency domain signal of the 2nd subcarrier, delivers to demodulation and decoder module 207.Then, memory access controller 302 can will read out the stored content of mnemon 4003 according to read memory address, as the homophase frequency-region signal of the 3rd subcarrier, deliver to demodulation and decoder module 207, then, memory access controller 302 can will read out the stored content of mnemon 4002 according to read memory address, as the orthogonal frequency domain signal of the 3rd subcarrier, delivers to demodulation and decoder module 207.
Thus, in the situation that FFT_IDX equals 0, that exports to the homophase of the 0th subcarrier of demodulation and decoder module 207 and the 0th subcarrier that orthogonal frequency domain signal is respectively former reception signal just gives homophase frequency-region signal; And in the situation that FFT_IDX is not 0, that exports to the homophase of FFT_IDX subcarrier of demodulation and decoder module 207 and (N-FFT_IDX) individual subcarrier that orthogonal frequency domain signal is respectively former reception signal just gives homophase frequency-region signal.
Then, please refer to Fig. 6, Fig. 6 is the flow chart that embodiments of the invention of the present invention provide the method for eliminating reversing spectrum.First, in step S502, passage is estimated, to obtain channel impulse response.Then, in step S504, channel impulse response is converted to channel frequence response, and channel-equalization processing is carried out in response to received signal according to channel frequence, to compensate, received signal because of signal attenuation and phase shift that passage was produced.Then,, in step S506, detect and receive the generation whether signal has reversing spectrum problem.If there is no the generation of reversing spectrum problem, perform step S508, if there is the generation of reversing spectrum problem, perform step S510.
Then, in step S508, by the homophase of FFT_IDX subcarrier of reception signal and homophase and the orthogonal frequency domain signal that orthogonal frequency domain signal is used as respectively FFT_IDX subcarrier will exporting at present.In step S516, the homophase of FFT_IDX subcarrier of output and orthogonal frequency domain signal are carried out to more code decoding of forward error.After step S516, get back to step S506, abovementioned steps S506 can be according to once whether successfully signal being decoded to detect the generation that whether has reversing spectrum problem before step S516, and step S506 can also detect the generation that whether has reversing spectrum problem by other modes certainly.
In step S510, check whether the frequency index value FFT_IDX of fast Fourier transform is 0.If the frequency index value FFT_IDX of fast Fourier transform is 0, carry out step S512.If the frequency index value FFT_IDX of fast Fourier transform is not 0, carry out step S514.In step S512, homophase and the orthogonal frequency domain signal of the 0th subcarrier of just giving homophase frequency-region signal to be used as respectively will to export at present of the 0th subcarrier of signal will be received.In step S514, the homophase frequency-region signal of just giving that receives (N-FFT_IDX) individual subcarrier of signal is used as respectively to homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier will exporting at present.
In sum, embodiments of the invention have proposed a kind of method, its device and its receiver of eliminating reversing spectrum, be different from prior art and for time-domain signal, carry out the method for reversing spectrum processing, the method for described elimination reversing spectrum is to carry out reversing spectrum processing for frequency-region signal.Thus, receiver, when processing the problem of reversing spectrum, does not need to allow its synchronization module carry out re-synchronization, therefore can save the time loss that re-synchronization causes, and be conducive to receiver, carries out to received signal the action of Fast synchronization.In addition, because the receiver overwhelming majority of existing multicarrier system has frequency-domain-interleaving module, therefore above-mentioned homophase and orthogonal frequency domain letter are carried out to the action of frequency spectrum reverse process, also may be implemented on for example time domain interleaver of balance controller, forward error correction module, and then do not increasing under the prerequisite of cost, realize the effect of eliminating reversing spectrum.
Although the present invention discloses as above with embodiment; so it is not in order to limit the present invention; under any, in technical field, have and conventionally know the knowledgeable; without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the claim person of defining.
Claims (16)
1. a method of eliminating reversing spectrum, is characterized in that, described method comprises:
Detect a reception signal and whether there is a reversing spectrum problem; And
If described reception signal has described reversing spectrum problem, check whether a frequency index value FFT_IDX of a fast Fourier transform is 0;
If described frequency index value FFT_IDX is zero, the homophase frequency-region signal of just giving of the 0th subcarrier of described reception signal is used as to homophase and the orthogonal frequency domain signal of the 0th subcarrier of an output signal; And
If described frequency index value FFT_IDX is non-vanishing, the homophase frequency-region signal of just giving of (N-FFT_IDX) individual subcarrier of described reception signal is used as to homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier of described output signal;
Wherein N is a sampling point number of described fast Fourier transform, and described frequency index value FFT_IDX is 0 to N-1 integer.
2. the method for elimination reversing spectrum as claimed in claim 1, is characterized in that, described method also comprises:
If described reception signal does not have described reversing spectrum problem, FFT_IDX the subcarrier of just giving the output signal of homophase frequency-region signal described in being used as of FFT_IDX subcarrier of described reception signal just given to homophase frequency-region signal.
3. the method for elimination reversing spectrum as claimed in claim 1, is characterized in that, described method comprises:
By described output signal, give a demodulation and decoder module is decoded.
4. the method for elimination reversing spectrum as claimed in claim 3, is characterized in that, if described demodulation and decoder module can successfully be decoded to described output signal, the described reception signal of judgement does not have described reversing spectrum problem; On the contrary, if described demodulation and decoder module can not successfully be decoded to described output signal, the described reception signal of judgement has described reversing spectrum problem.
5. the method for elimination reversing spectrum as claimed in claim 1, is characterized in that, the method for described elimination reversing spectrum is for a receiver of a multicarrier communication system.
6. a device of eliminating reversing spectrum, is characterized in that, described device comprises:
Whether one reversing spectrum detector, have a reversing spectrum problem in order to detect a reception signal, and export accordingly control signal;
One Frequency Domain Solution interleaver, according to described output control signal, producing memory writes and reads address, and in order to write according to described memory and a frequency index value FFT_IDX who reads address and a fast Fourier transform, FFT_IDX subcarrier homophase of described reception signal and orthogonal frequency domain signal are write to described Frequency Domain Solution interleaver, and the Frequency Domain Solution interleaver from described is read to homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier of an output signal, one sampling point number of wherein said fast Fourier transform is expressed as N, and described frequency index value FFT_IDX is 0 to N-1 integer,
Wherein, if described reception signal has described reversing spectrum problem, and described frequency index value FFT_IDX is zero, described Frequency Domain Solution interleaver is used as the homophase frequency-region signal of just giving of the 0th subcarrier of described reception signal as homophase and the orthogonal frequency domain signal of the 0th subcarrier of an output signal
Wherein, if described reception signal has described reversing spectrum problem, and described frequency index value FFT_IDX is non-vanishing, described Frequency Domain Solution interleaver is used as the homophase frequency-region signal of just giving of (N-FFT_IDX) individual subcarrier of described reception signal as homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier of described output signal.
7. a kind of device of eliminating reversing spectrum as claimed in claim 6, is characterized in that, described Frequency Domain Solution interleaver comprises:
One storing memory that interweaves;
One memory address generator, produces memory according to described output control signal and writes and read address; And
One memory access controller, in order to write according to described memory and the described frequency index value FFT_IDX that reads address and described fast Fourier transform, FFT_IDX subcarrier homophase of described reception signal and orthogonal frequency domain signal are write to the described storing memory that interweaves, and the storing memory that interweaves from described is read to FFT_IDX subcarrier homophase and the orthogonal frequency domain signal of described output signal.
8. a kind of device of eliminating reversing spectrum as claimed in claim 6, is characterized in that, described reversing spectrum detector comprises:
One demodulation and decoder module, in order to described output signal is decoded, and accordingly to produce a detection signal; And
One finite state machine, determines the level of described output control signal according to its current state and described detection signal.
9. a kind of device of eliminating reversing spectrum as claimed in claim 7, it is characterized in that, when receiving that signal has described reversing spectrum problem and when described frequency index value FFT_IDX is 0, see through the memory that described memory address generator produces and write and read address, the 0th subcarrier that the homophase of the 0th subcarrier of the described output signal that described memory access controller is exported and orthogonal frequency domain signal are reception signal just give homophase frequency-region signal; When receiving that signal has described reversing spectrum problem and when described frequency is indexed to FFT_IDX and is not 0, see through the memory that described memory address generator produces and write and read address, the homophase of FFT_IDX the subcarrier that described memory access controller is exported and orthogonal frequency domain signal be described reception signal (N-FFT_IDX) individual subcarrier just give homophase frequency-region signal.
10. a kind of device of eliminating reversing spectrum as claimed in claim 6, is characterized in that, the device of described elimination reversing spectrum is for a receiver of a multicarrier communication system.
11. 1 kinds of receivers, is characterized in that, described receiver comprises:
One passage is estimated and balance module, in order to export a reception signal;
One Frequency Domain Solution interleaver, in order to receive an output control signal and described reception signal, and whether there is a reversing spectrum problem according to the described described reception signal of output control signal judgement, if described reception signal has described reversing spectrum problem, and a frequency index value FFT_IDX of a fast fourier transform is zero, the homophase frequency-region signal of just giving of the 0th subcarrier of described reception signal is used as to homophase and the orthogonal frequency domain signal of the 0th subcarrier of an output signal, when described reception signal has described reversing spectrum problem, and described frequency index value FFT_IDX is non-vanishing, the homophase frequency-region signal of just giving of (N-FFT_IDX) individual subcarrier of described reception signal is used as to homophase and the orthogonal frequency domain signal of FFT_IDX subcarrier of described output signal, wherein N is a sampling point number of described fast Fourier transform, described frequency index value FFT_IDX is 0 to N-1 integer, and
Whether one reversing spectrum detector, have described reversing spectrum problem in order to detect described reception signal, and export described output control signal accordingly.
12. a kind of receivers as claimed in claim 11, is characterized in that, described Frequency Domain Solution interleaver comprises:
One storing memory that interweaves;
One memory address generator, produces memory according to described output control signal and writes and read address; And
One memory access controller, in order to write according to described memory and the described frequency index value FFT_IDX that reads address and described fast Fourier transform, FFT_IDX subcarrier homophase of described reception signal and orthogonal frequency domain signal are write to the described storing memory that interweaves, and the storing memory that interweaves from described is read to FFT_IDX subcarrier homophase and the orthogonal frequency domain signal of described output signal.
13. a kind of receivers as claimed in claim 11, is characterized in that, described reversing spectrum detector comprises:
One demodulation and decoder module, in order to described output signal is decoded, and accordingly to produce a detection signal; And
One finite state machine, determines the level of described output control signal according to its current state and described detection signal.
14. a kind of receivers as claimed in claim 11, is characterized in that, described receiver also comprises:
One antenna;
One tuner, is coupled to described antenna;
One sampling and down conversion module, is coupled to described tuner; And
One signal synchronization circuit, is coupled to described sampling and down conversion module;
Wherein said passage is estimated and balance module is coupled to described signal synchronization circuit.
15. a kind of receivers as claimed in claim 11, it is characterized in that, described reception signal does not have described reversing spectrum problem, FFT_IDX the subcarrier of just giving the output signal of homophase frequency-region signal described in being used as of FFT_IDX subcarrier of described reception signal is just given to homophase frequency-region signal.
16. a kind of receivers as claimed in claim 11, is characterized in that, described receiver is for a multicarrier communication system.
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| US20090323871A1 (en) * | 2008-04-28 | 2009-12-31 | Newport Media, Inc. | Application of Superfast Algorithms to a Pilot-Based Channel Estimation Process |
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