CN1960200A - Diversity receiver - Google Patents
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- CN1960200A CN1960200A CN 200510117306 CN200510117306A CN1960200A CN 1960200 A CN1960200 A CN 1960200A CN 200510117306 CN200510117306 CN 200510117306 CN 200510117306 A CN200510117306 A CN 200510117306A CN 1960200 A CN1960200 A CN 1960200A
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Abstract
N pieces of branches are supposed to receive the M pieces of versions of one input signal. It also includes N pieces of channel state info. Estimators (CSIE), a demodulation device (DD) and a combination and reverse mapping device (CRMD). DD demodulates the received M pieces of versions of the input signal to produce M pieces of demodulated signals. CSIE resides on each branch to draw respectively the signal from DD and produces respectively M pieces of channel parameters related to the M pieces of versions. According to the related channel parameter of each version, CRMD receives signal-combines and sign-reverse-maps the M pieces of demodulated signals to produce a waiting for correct signal. The channel parameter contains the signal noise ratio estimation value, channel power estimation value, noise power estimation value, etc.
Description
Technical field
The present invention is relevant for receiver (receiver), especially relevant for a kind of diversity (diversity) receiver of doing estimation based on channel (channel) state of frequency domain (frequency-domain) or time domain (time-domain).
Background technology
(orthogonal frequency division multiplexing, OFDM) system is a multicarrier system, orthogonal between each subcarrier (sub-carrier), and independent modulation because the orthogonal frequency division multitask.The time become in (time-variant) channel, even carry out after channel estimating and the gradeization, the problem of phase mutual interference (interference) still has a strong impact on the execution usefulness of system between subcarrier, also causes wrong flat (the error floor) of bit error rate (bit error rate) simultaneously.
Diversity reception is a kind of widely used technology, particularly is applied in action and receives (mobilereception) aspect.Generally speaking, diversity receiver comprises at least two antennas (antenna) and its follow-up signal processing to merge the input signal in different paths, and two antenna spaced apart are to receive the transmission signals (transmitted signal) of different editions (version).
In the 6th, 151, No. 372 patent documentations of the U.S., NEC Corporation has proposed a kind of diversity receiver, mainly comprises two identical branches (branch) in order to receive and to handle input signal.The diversity processing unit 120 that is positioned between fourier transform (Fourier transform) circuit 111,112 and arranged side by side-serial conversion circuit 130 has two kinds of frameworks, is respectively that signal merges and signal selection framework.The signal that Figure 1A is depicted as the diversity processing unit merges framework.With reference to Figure 1A, be divided into two propagation path P in the diversity processing unit 120
1, P
2, and comprise two channel estimators (channel estimator) 121a, 121b, two conjugate complex numbers (complex conjugate) 122a of portion, 122b, complex multiplier 123a, 123b and a combiner (combiner) 124.With propagation path P
1Be example, channel estimator 121a is at the first propagation path P
1Estimate channel frequency response (channel frequency response) H
1(ω), the 122a of conjugate complex number portion is in order to produce channel frequency response H
1Conjugate complex number H (ω)
1 *(ω), complex multiplier 123a is with the output signal and the conjugate complex number H of fourier transform circuit 111
1 *(ω) multiply each other.After the output signal merging of combiner (combiner) 124 with two complex multiplier 123a, 123b, export to side by side-serial conversion electricity 130.
Figure 1B is depicted as the signal of diversity processing unit and selects framework.Collection processing unit 120 among Figure 1B comprises two propagation path feature estimation portions (propagation characteristic estimatingsection) 121a ', 121b ', comparator 125 and a selector (selector) 126.Comparator 125 is by two channel frequency response H
1(ω), H
2(ω), produce one at amplitude the greater and select signal.Selector 126 is selected signal according to this, selects one to export to side by side-serial conversion circuit 130 among the output signal of two fourier transform circuit 111 and 112.
Fig. 2 is the framework calcspar of a known diversity receiver.The U.S. the 6th, 792, in No. 258 patent documentations, BBC company has also disclosed a kind of diversity receiver.Diversity receiver 200 comprises two antenna 201a, 201b, two tuners (tuner) 202a, 202b, two demodulators (demodulator) 203a, 203b, two front processor 204a, 204b, soft judgement (soft decision) combiner 205, a viterbi decoder (viterbi decoder) 206, one preprocessor 207 and a diversity controller 208 that a channel status is qualified.Diversity controller 208 receives the output signal of two front processor 204a, 204b and viterbi decoder 206 to judge two propagation path P
1, P
2Signal quality, and then dynamically adjust or sequencing tuner 202a, 202b, not only can select to be connected to the signal source (source) of tuner 202a, 202b, and can switch with four kinds of patterns of antenna electric wave field pattern diversity (antenna pattern diversity) in frequency diversity (frequency diversity), antenna space diversity (antenna spatialdiversity), antenna polarization diversity (antenna polarization diversity), to guarantee the quality of diversity receiver 200 received signals.
Fig. 3 is the framework calcspar of another known diversity receiver.
Disclose in No. 2002/0021773 at american documentation literature, Henriksson proposes another kind of diversity receiver.With reference to figure 3, diversity receiver 300 comprises 311,312, two soft position (soft bit) generator 301a, 301b of two fast fourier transform circuit, two channel estimator 302a, 302b, two filters (filter) 303a, 303b, a router (router) 304 and combiners 124.Diversity receiver 300 comprises two identical branches 310,320, and with regard to branch 310, channel estimator 302a produces channel estimation value (channel frequency response H for example
1(ω)), and offer soft position (soft bit) generator 301a and filter 303a, respectively in order to improve channel distortion and the stability that increases channel estimation value.Router three 04 receives the output valve of two filter 303a, 303b, and to compare the signal quality of two branches 310,320, afterwards, decision will merge the signal of two branches 310,320 or select an output again.Subsequently, combiner 124 is carried out signal and is merged or selection function according to the output signal of router three 04.Wherein, combiner 124 performed signals are associated with two kinds of kenels, the one, height ratio merge (maximal ratio combining, MRC), another be equal gain merge (equal gain combining, EGC).
Yet, more than three kinds of diversity receivers before making signal and merging, only be referenced to channel frequency response estimated value H (ω), make its signal quality under some channel circumstance still desirable not to the utmost.The channel information that the present invention uses diversity receiver to obtain fully merges required relevant parameter to obtain diversity, and then significantly increases quality and stability that signal merges.
Summary of the invention
Main purpose of the present invention is to provide a kind of and makes the diversity receiver of estimation based on the channel status of frequency domain or time domain, by accurate measurement with merge all diversity branches obtaining all possible gain, and then the enhanced signal quality with keep the stability of a system.
For reaching above-mentioned purpose, diversity receiver of the present invention, be provided with N branch, in order to M the version (version) that receives an input signal, this diversity receiver comprises N channel condition information estimator (channel estimation information estimator), a demodulating equipment and merges and reverse mapping device (combining and demapping device).Demodulating equipment receives M version signal, and respectively according to corresponding one group of channel frequency response estimated value with after carrying out demodulation, produce M restituted signal.N channel condition information estimator is divided into each branch, captures the signal from demodulating equipment respectively, with indivedual generations and M the corresponding M of a version channel parameter (channel parameter).Merging with reverse mapping device is the channel parameter relevant according to each version, receives M restituted signal with carry out signal and merge and DO symbol is reverse video after, more positive signal is treated in generation one.Wherein, N, M are positive integer, N 〉=2, M 〉=2.
Time-domain signal or frequency-region signal that channel condition information estimator of the present invention can capture in the demodulating equipment are estimated.When the signal source of channel condition information estimator was time-domain signal, the complexity of calculating was lower, but the channel information that estimates makes that than inaccuracy the signal quality after the diversity merging is roughly relatively poor.And when the signal source of channel condition information estimator was frequency-region signal, computation complexity was higher, but the channel information that estimates is more accurate, so the signal quality after its diversity merges is relatively good.
Description of drawings
The signal that Figure 1A is depicted as the diversity processing unit merges framework.
Figure 1B is depicted as the signal of diversity processing unit and selects framework.
Fig. 2 is the framework calcspar of a known diversity receiver.
Fig. 3 is the framework calcspar of another known diversity receiver.
Fig. 4 A is according to the present invention, and number of branches is the framework calcspar of the diversity receiver of N.
Fig. 4 B is according to the present invention, and number of branches is the framework calcspar of two diversity receiver.
Fig. 5 A is the framework calcspar of the first embodiment of the present invention.
Fig. 5 B be among Fig. 5 A the diversity merge cells than the detailed architecture calcspar.
Fig. 5 C is the equivalent circuit diagram of the second embodiment of the present invention.
Fig. 5 D is the equivalent circuit diagram of the third embodiment of the present invention.
Fig. 5 E is the equivalent circuit diagram of the fourth embodiment of the present invention.
Fig. 5 F is the equivalent circuit diagram of the fifth embodiment of the present invention.
Fig. 6 A is the framework calcspar of the sixth embodiment of the present invention.
Fig. 6 B is the equivalent circuit diagram of the seventh embodiment of the present invention.
Fig. 6 C is the equivalent circuit diagram of the eighth embodiment of the present invention.
Fig. 7 is the framework calcspar of the ninth embodiment of the present invention.
Fig. 8 is the framework calcspar of the tenth embodiment of the present invention.
Embodiment
Fig. 4 A is according to the present invention, and number of branches is the framework calcspar of the diversity receiver of N.With reference to figure 4A, R diversity receiver 400 of the present invention, be provided with the individual branch of N (N is positive integer and N 〉=2), in order to the individual version (not shown) of M (M is positive integer and M 〉=2) that receives an input signal, diversity receiver 400 comprises: a demodulating equipment 420, N channel condition information estimator 411～41N and merge and reverse mapping device 430.Demodulating equipment 420 receives M version of aforementioned input signal, and respectively according to the corresponding one group of channel frequency response estimated value H of each version with after carrying out demodulation, produce M restituted signal.N channel condition information estimator 411～41N is divided into each branch, captures the data in the demodulating equipment 420 respectively, with indivedual generations and M the corresponding M of a version channel parameter CSI
1～CSI
M, and these parameters can be divided into first level of symbol (symbol level) and subcarrier level (sub-carrier level), accord with the mean value of first level parameter equivalent in individual other subcarrier level parameter.Merge with reverse mapping device 430 be according to the corresponding channel parameter of each version, receives M restituted signal with carry out signal merge oppositely video with DO symbol after, more positive signal is treated in generation one.
When N=2, M=2, the framework of diversity receiver is shown in Fig. 4 B.Diversity receiver 450 comprises a demodulating equipment 460, two channel condition information estimators 411～412 and merge and reverse mapping device 470.First, second version of demodulating equipment 460 receiving inputted signals, and respectively according to the corresponding one group of channel frequency response estimated value H of each version
1, H
2After carrying out demodulation, produce first, second restituted signal.Merge with reverse mapping device 470 be according to the corresponding channel parameter of each version, receive first, second restituted signal and merge and DO symbol oppositely after the reflection to carry out signal, produce one and treat more positive signal.The function of channel condition information estimator is then identical with Fig. 4 A, no longer repeats.
Because the structure of channel is unknown, diversity receiver is the gain on the obtained performance, need to estimate the required channel parameter that might gain, with accurate measurement and merge all branches.According to the present invention, the difference that merges the position because of the signal of diversity receiver, parameters needed or information or variant during merging, even, because of the difference in the source of the signal that captured (time domain (time-domain) or (frequency-domain)) frequently, the channel parameter that is produced is restriction to some extent also.Below explaining for convenient, is that example describes framework of the present invention in detail with N=2, M=2.
Fig. 5 A is the framework calcspar of the first embodiment of the present invention.Demodulating equipment 460 among Fig. 4 B, be to implement in the present embodiment with 311,312 and two channel equalizers 526,527 of two fast fourier transform circuit, and merging among Fig. 4 B and reverse mapping device 470 are then implemented with two reverse projection instruments 531,532 in soft position and a diversity merge cells 533 in the present embodiment.
With reference to figure 5A, the first embodiment of the present invention is provided with two branches 501～502, in order to receive first and second version of an input signal, mainly comprise oppositely projection instrument (soft-bits demapper) 531,532, one diversity merge cells (diversity combine unit) 533 and one error correction code element (error correction codeunit) 541 of 411,412, two soft positions of 311,312, two channel equalizers of two fast fourier transform circuit (channel equalizer), 526,527, two channel condition information estimators.The structure of each branch is all identical, for receiving and the signal of handling different editions.With branch 501 is example, supposes that fast fourier transform circuit 311 receives the signal of first version, after carrying out fourier transform, produces a frequency-region signal.Channel condition information estimator 411 these frequency-region signals of acquisition, and utilize the reference signal (for example pilot signal (pilot signal)) that includes, obtain channel frequency response estimated value H
1With different channel parameter CSI
1Channel equalizer 526 receives frequency-region signals, and one group of channel frequency response estimated value being exported according to channel condition information estimator 411, to produce the first restituted signal DM
1Soft position oppositely projection instrument 531 receives the first restituted signal DM
1, after whether decision adjusted decision boundary (decisionboundary), promptly DO symbol was oppositely videoed, to produce first soft signal SB
1
Fig. 5 B be among Fig. 5 A the diversity merge cells than the detailed architecture calcspar.With reference to figure 5B, diversity merge cells 533 receives first and second soft position signal SB
1, SB
2, multiply by a kind of channel parameter CSI respectively in multiplier 551,552
1, CSI
2, to produce two groups of back signal S that multiply each other
1, S
2After, estimated according to channel condition information estimator 411,412 again channel parameter CSI
1, CSI
2Assess the channel conditions of first and second branch, for example CSI at present
1, CSI
2Can be respectively signal noise ratio estimated value SNR1 and SNR2, relatively after both, utilize multiplexer 554 output combined signal (S
1+ S
2) or select signal (S
1With S
2One of them).In diversity merge cells 533, merging or the mechanism of selecting are looked different receiver architecture can be divided into the first level of symbol, a subcarrier level and a position level (bit-level).In Fig. 5 A, what diversity merge cells 533 was carried out is the merging or the selection of a level, and produces one and treat more positive signal.
At last, error correction code element 541 receives treats more positive signal, and carries out error correction.Error correction code element 541 available channel decoders (channel decoder) are implemented with anti-phase interleaver devices such as (de-interleaver) as viterbi decoder (Viterbidecoder) or Randt-Solomon encoder (Reed-Solomon decoder).
Channel condition information estimator among first to the 8th embodiment all captures frequency-region signal to be estimated, therefore claims this kind device for make the diversity receiver of estimation based on the frequency domain channel state.Channel condition information estimator 411,412 also produces channel parameter CSI in the diversity receiver of doing to estimate based on the frequency domain channel state except producing channel frequency response estimated value H.Channel parameter CSI comprises signal noise ratio estimated value SNR, channel power estimated value | H|
2With the noise power estimation values sigma
2Or the like subparameter.Above-mentioned each subparameter can be further divided into secondary, promptly accord with first level (symbol level) and subcarrier level (sub-carrier level), accord with the mean value of first level parameter equivalent in individual other subcarrier level parameter, the signal noise ratio estimated value that accords with first level when for example doing estimation based on the frequency domain channel state is the mean value of all indivedual subcarrier signal noise ratio estimated values of subcarrier level.
In Fig. 5 A, because diversity merge cells 533 is to be positioned at the oppositely rear end of projection instrument 531,532, soft position, the back combination type is referred to as to video.With regard to the back combination type of videoing, again according to the reverse difference of projection instrument, the employed parameter of diversity merge cells in channel equalizer, soft position, and whether the reverse projection instrument in soft position adjusts decision boundary, following second to the 5th embodiment is arranged, be the employed parameter of convenient expression, all the form with equivalent circuit diagram illustrates.
Fig. 5 C is the equivalent circuit diagram of the second embodiment of the present invention.With reference to figure 5A, 5C, channel equalizer 526,527 is equivalent to multiplier 561,562 respectively, and 533 of diversity merge cellses are equivalent to multiplier 551,552, adder 553.It is noted that, below each figure for asking to simplify adder 553 and multiplexer 554 are merged into an addition and multiplexer 555.With regard to branch 501, at first the frequency-region signal that fourier transform circuit 311 is exported multiply by the H reciprocal of channel frequency response estimated value
1 -1(or divided by channel frequency response estimated value H
1), to produce the first restituted signal DM
1The first restituted signal DM
1Oppositely during projection instrument 531, need not adjust decision boundary by soft position, directly DO symbol oppositely behind the reflection, produces first soft signal SB
1First and second soft position signal SB
1, SB
2Enter respectively after the diversity merge cells 533, multiplier 551 is with first soft signal SB
1With signal noise ratio estimated value SNR
1Produce the back signal S that multiplies each other after multiplying each other
1, multiplier 552 is with second soft signal SB
2With signal noise ratio estimated value SNR
2Produce the back signal S that multiplies each other after multiplying each other
2
First and second soft position signal SB
1, SB
2Enter diversity merge cells 533 respectively, and multiply by the signal noise ratio estimated mean value of the first level of symbol, or after the subcarrier signal noise ratio estimated value of subcarrier level, again according to the estimated channel parameter CSI of channel condition information estimator 411,412
1, CSI
2Assess the channel conditions of first and second branch at present,, treat more positive signal with generation with merging or the selection computing of carrying out a level (bit-level).
Fig. 5 D is the equivalent circuit diagram of the third embodiment of the present invention.Fig. 5 D is producing first and second restituted signal DM
1, DM
2Circuit before and Fig. 5 C are identical, no longer repeat.With reference to figure 5D, with regard to branch 501, multiplier 551 is with the first restituted signal DM
1With signal noise ratio estimated value SNR
1Output after multiplying each other, soft position oppositely projection instrument 531 more utilizes signal noise ratio estimated value SNR
1With the adjustment decision boundary, and after DO symbol is oppositely videoed, produce first soft signal SB
1First and second soft position signal SB
1, SB
2Enter respectively after the diversity merge cells 533, carry out the merging of a level again or select computing, treat more positive signal with generation.
Fig. 5 E is the equivalent circuit diagram of the fourth embodiment of the present invention.Fig. 5 E is producing first and second soft position signal SB
1, SB
2Circuit before and Fig. 5 C are identical, no longer repeat.With reference to figure 5E, first and second soft position signal SB
1, SB
2Enter respectively after the diversity merge cells 533, multiplier 556, multiplier 551 are continuously with the first soft item SSB
1Multiply by the channel power estimated value | H
1|
2And the inverse of noise power estimated value (1/ σ
1 2), produce the back signal S that multiplies each other after multiplying each other
1Second soft signal SB
2Also via producing the back signal S that multiplies each other after the identical multiplication process
2, carry out the merging of follow-up position level again or select computing, treat more positive signal with generation.
Fig. 5 F is the equivalent circuit diagram of the fifth embodiment of the present invention.With reference to figure 5F, with regard to branch 501, at first the frequency-region signal that fast fourier transform circuit 311 is exported multiply by the conjugate complex numerical value H of channel frequency response estimated value
1 *, to produce the first restituted signal DM
1The first restituted signal DM
1Oppositely during projection instrument 531, soft position oppositely projection instrument 531 utilizes the channel power estimated value by soft position | H
1|
2With the adjustment decision boundary, and after DO symbol is oppositely videoed, produce first soft signal SB
1First and second soft position signal SB
1, SB
2Enter respectively after the diversity merge cells 533, multiplier 551 is with first soft signal SB
1Inverse (1/ σ with the noise power estimated value
1 2) multiplying each other produces the back signal S that multiplies each other afterwards
1, multiplier 552 is with second soft signal SB
2Inverse (1/ σ with the noise power estimated value
2 2) multiplying each other produces the back signal S that multiplies each other afterwards
2Diversity merge cells 533 is again according to the estimated channel parameter CSI of channel condition information estimator 411,412
1, CSI
2Assess the channel conditions of first and second branch at present,, treat more positive signal with generation with merging or the selection computing of carrying out follow-up position level.
Fig. 6 A is the framework calcspar of the sixth embodiment of the present invention.Merging among Fig. 4 B and reverse mapping device 470, then implement in the present embodiment with the reverse projection instrument 531 of a diversity merge cells 533 and a soft position, merging that carry out this moment in diversity merge cells 533 or choice mechanism can be first level of symbol or subcarrier level, all the other structures are identical with first embodiment, no longer repeat.
With reference to figure 6A, the sixth embodiment of the present invention is provided with two branches 601～602, in order to connect first and second version of an input signal, mainly comprise 311,312, two channel equalizers of two fast fourier transform circuit 526,527, two channel condition information estimators, 411,412, one soft position oppositely projection instrument 531, a diversity merge cells 533 and an error correction code element 541.Fig. 6 A is producing first and second restituted signal DM
1, DM
2Circuit before and Fig. 5 A are identical, no longer repeat.Diversity merge cells 533 receives first and second restituted signal DM
1, DM
2, multiply by a kind of channel parameter CSI respectively
1, CSI
2After, estimated according to channel condition information estimator 411,412 again channel parameter CSI
1, CSI
2Assess the channel conditions of first and second branch at present, select to accord with the merging of first level or subcarrier level again or select computing.
In Fig. 6 A,, be referred to as combination type such as back such as gradeization because diversity merge cells 533 is the rear ends that are positioned at channel equalizer 526,527.With regard to combination type such as back such as gradeization, again according to the difference of channel equalizer, soft reverse projection instrument, the employed parameter of diversity merge cells, and whether soft position oppositely adjusts the decision-making limit as device, following the 7th to the 8th embodiment is arranged, be the parameter that convenient expression is used, all the form with equivalent circuit diagram illustrates.
Fig. 6 B is the equivalent circuit diagram of the seventh embodiment of the present invention.The 7th embodiment is producing first and second restituted signal DM
1, DM
2The circuit before and second embodiment are identical, no longer repeat.With reference to figure 6B, first and second restituted signal DM
1, DM
2Enter respectively after the diversity merge cells 533, multiplier 551 is with the first restituted signal DM
1With signal noise ratio estimated value SNR
1Produce the back signal S that multiplies each other after multiplying each other
1, multiplier 552 is with the second restituted signal DM
2With signal noise ratio estimated value SNR
2Produce the back signal S that multiplies each other after multiplying each other
2, select again to accord with the merging of first level or subcarrier level or select computing, to produce a combined signal.Combined signal is by soft position oppositely during projection instrument 531, and soft position oppositely projection instrument 531 utilizes the summation (SNR of the signal noise ratio estimated value of two branches earlier
1+ SNR
2) with the adjustment decision boundary, and after DO symbol is oppositely videoed, produce and treat more positive signal.
Fig. 6 C is the equivalent circuit diagram of the eighth embodiment of the present invention.The 8th embodiment is identical at the circuit and the 7th embodiment that produce combined signal, no longer repeats.With reference to figure 6C, oppositely during projection instrument 531, multiplier 651 wherein is with the inverse 1/ (SNR of the signal noise ratio estimated value summation of combined signal and two branches by soft position for combined signal
1+ SNR
2) multiply each other, and after DO symbol is oppositely videoed, produce soft position signal SB, utilize the signal noise ratio estimated value summation (SNR of multiplier 652 again with soft position signal and two branches
1+ SNR
2) multiply each other, treat more positive signal with generation.
Above embodiment, the source of the signal that the channel condition information estimator is captured all is the frequency-region signal that the fast fourier transform circuit is exported, for reducing amount of calculation, channel condition information estimator also fechtable time-domain signal is estimated channel parameter, just makes the diversity receiver of estimation based on the time domain channel state.Below will be with two embodiment Benq make the framework of the diversity receiver of estimation in the time domain channel state.
Fig. 7 is the framework calcspar of the ninth embodiment of the present invention.Demodulating equipment 460 among Fig. 4 B is to implement with 311,312 and two channel equalizers 526,527 of two automatic gain control 721,722, two fast fourier transform circuit in (automatic gain control) unit in the present embodiment.Compare with first embodiment of Fig. 5 A, maximum difference is that the 9th embodiment increases by two automatic gain control units 721,722 so that provide time-domain signal to estimate channel parameter to channel condition information estimator 411,412.Yet, when channel condition information estimator 411,412 captures time-domain signals with the estimation channel parameter, and can't provide calculating channel frequency response estimated value H, this is because calculating channel frequency response estimated value H must use the information of frequency-region signal, so, the work of calculating channel frequency response estimated value H just itself is handled by the channel equalizer 526,527 that needs are used channel frequency response estimated value H.But be not limited thereto during practical application, be the estimation that channel frequency response estimated value H also can be made time domain channel impulse response (channel impulse response) by channel condition information estimator 411 (412), try to achieve channel frequency response estimated value H by fast fourier transform circuit 311 (312) again.
With branch 701, comprise an automatic gain control unit 721, a fast fourier transform circuit 311, a channel equalizer 526, one soft position oppositely a projection instrument 531 and a channel condition information estimator 411.Suppose that automatic gain control unit 721 is the signals (this signal is a time-domain signal) that receive first version, exports after with amplification or decay according to the watt level of signal own again.The signal processing and first embodiment that the time-domain signal of automatic gain control unit 721 outputs enters after the fast fourier transform circuit 311 are identical, and just channel equalizer 526 has increased the function of calculating channel frequency response estimated value H.
The structure of the 9th embodiment itself belongs to reflection back combination type, therefore channel equalizer, soft position oppositely projection instrument, the employed channel parameter of diversity merge cells among second embodiment to the, five embodiment, and soft position oppositely projection instrument whether must adjust decision boundary, also be applicable to the 9th embodiment.
Fig. 8 is the framework calcspar of the tenth embodiment of the present invention.Compare with the 6th embodiment of Fig. 6 A, maximum difference is that the tenth embodiment increases by two automatic gain control units 721,722 so that provide time-domain signal to channel condition information estimator 411,412.Other structure is identical with the 6th embodiment, no longer repeats.Change back combination types such as the structure of the tenth embodiment itself belongs to, therefore channel equalizer, soft position oppositely projection instrument, the employed channel parameter of diversity merge cells among the 7th embodiment to the eight embodiment, and soft position oppositely projection instrument whether must adjust decision boundary, also be applicable to the tenth embodiment.
It is noted that, when channel condition information estimator 411,412 utilizes time-domain signal to estimate channel parameter, its restriction in the sky is earlier arranged, and promptly estimated channel parameter is the mean value of the first level of symbol, for example signal noise ratio estimated mean value SNR, channel power estimated mean value | H|
2With noise power estimated mean value σ
2Deng, and can't calculate indivedual estimated values of subcarrier level.
The invention provides the different hardware designs of diversity receiver, the user can select to estimate based on time domain or frequency domain channel state according to the requirement of the complexity or the signal quality of system design.Simultaneously, the present invention provides different signals to merge position and different channel parameters according to various channel status, obtaining all possible gain, and then enhanced signal quality and keep the stability of a system.
Claims (46)
1. a diversity receiver is characterized in that, is provided with N branch, and in order to receive the input signal of M version, this diversity receiver comprises:
One demodulating equipment receives described M version input signal, and after carrying out demodulation according to corresponding one group of channel frequency response estimated value respectively, produces a corresponding M restituted signal;
N channel condition information estimator is divided into each branch, and each channel condition information estimator captures the signal from demodulating equipment respectively, with indivedual generations and the corresponding channel parameter of this version input signal; And
One merges and reverse mapping device, is according to the corresponding channel parameter of each version input signal, receives a described M restituted signal respectively and merges and DO symbol oppositely after the reflection to carry out signal, and more positive signal is treated in generation one;
Wherein, N, M are positive integer, N 〉=2, M 〉=2.
2. diversity receiver as claimed in claim 1 is characterized in that, more comprises an error correction code element, treats that to described more positive signal is carried out error correction.
3. diversity receiver as claimed in claim 1 is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is one group of subcarrier frequency response estimated value.
4. diversity receiver as claimed in claim 1 is characterized in that, described demodulating equipment is provided with in each branch:
One fast fourier transform circuit receives one of described M version input signal, and carries out producing a frequency-region signal after the fourier transform; And
One channel equalizer receives frequency-region signal, and should organize the channel frequency response estimated value according to corresponding, produces one of described M restituted signal.
5. diversity receiver as claimed in claim 4 is characterized in that, described merging comprises with reverse mapping device:
N the reverse projection instrument in soft position is divided into each branch, receives a described M restituted signal respectively, after DO symbol is oppositely videoed, produces M soft signal; And
One diversity merge cells receives the individual soft position of described M signal, and multiply by corresponding channel parameter respectively, after producing the signal after the M group multiplies each other, again according to the channel conditions of a described N branch, after carrying out merging or selecting computing, to export the described more positive signal for the treatment of.
6. diversity receiver as claimed in claim 5 is characterized in that, described diversity merge cells is the corresponding channel parameter according to each version input signal, and the merging of execute bit level or selection computing are to export the described more positive signal for the treatment of.
7. diversity receiver as claimed in claim 5 is characterized in that, after the channel condition information estimator acquisition frequency-region signal of each branch, produces this group channel frequency response estimated value and channel parameter.
8. diversity receiver as claimed in claim 7 is characterized in that, the channel equalizer of each branch be with frequency-region signal divided by after this group channel frequency response estimated value, produce one of described M restituted signal.
9. diversity receiver as claimed in claim 8, it is characterized in that, the corresponding channel parameter of each version input signal is to comprise one group of signal noise ratio estimated value, this group signal noise ratio estimated value is one group of signal noise ratio estimated mean value of the first level of symbol, or one group of subcarrier signal noise ratio estimated value of subcarrier level.
10. diversity receiver as claimed in claim 8, it is characterized in that, the corresponding channel parameter of each version input signal is to comprise one first group of channel subparameter and one second group of channel subparameter, this first group of channel subparameter comprises one group of channel power estimated mean value or one group of subcarrier channel power estimated value, and this second group of channel subparameter comprises the inverse of reciprocal or one group of subcarrier noise power estimated value of one group of noise power estimated mean value.
11. diversity receiver as claimed in claim 10 is characterized in that, the diversity merge cells receives described M soft position signal, and multiply by this two groups of channel subparameters respectively continuously, to produce the signal after the M group multiplies each other.
12. diversity receiver as claimed in claim 7 is characterized in that, the channel equalizer of each branch is that frequency-region signal be multiply by after the conjugate complex number of this group channel frequency response estimated value, produces one of described M restituted signal.
13. diversity receiver as claimed in claim 12, it is characterized in that, the corresponding channel parameter of each version input signal is to comprise one first group of channel subparameter and one second group of channel subparameter, this first group of channel subparameter comprises one group of channel power estimated mean value or one group of subcarrier channel power estimated value, and this second group of channel subparameter comprises the inverse of reciprocal or one group of subcarrier noise power estimated value of one group of noise power estimated mean value.
14. diversity receiver as claimed in claim 13, it is characterized in that, the soft position of each branch oppositely projection instrument is according to first group of channel subparameter, adjust decision boundary, the diversity merge cells is to described M soft position signal, multiply by second group of channel subparameter respectively, to produce the signal after this M group multiplies each other.
15. diversity receiver as claimed in claim 5 is characterized in that, described demodulating equipment more comprised an automatic gain control unit before the fast fourier transform circuit of each branch, in order to amplify or the time domain signal of decaying.
16. diversity receiver as claimed in claim 15 is characterized in that, after the channel condition information estimator acquisition time-domain signal of each branch, produces channel parameter.
17. diversity receiver as claimed in claim 16 is characterized in that, the channel equalizer of each branch be with frequency-region signal divided by after this group channel frequency response estimated value, produce one of described M restituted signal.
18. diversity receiver as claimed in claim 16 is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is produced by the channel equalizer of being located at this branch.
19. diversity receiver as claimed in claim 16, it is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is to be done to produce by the fast fourier transform circuit after the estimation of time domain channel impulse response by this channel condition information estimator of being located at this branch again.
20. diversity receiver as claimed in claim 17 is characterized in that, corresponding this channel parameter of each version input signal comprises one group of signal noise ratio estimated mean value.
21. diversity receiver as claimed in claim 17 is characterized in that, corresponding this channel parameter of each version input signal is the inverse that comprises one group of channel power estimated mean value and one group of noise power estimated mean value.
22. diversity receiver as claimed in claim 21 is characterized in that, the diversity merge cells receives described M soft position signal, and multiply by this two groups of channel subparameters respectively continuously, to produce the signal after the M group multiplies each other.
23. diversity receiver as claimed in claim 16 is characterized in that, the channel equalizer of each branch is that frequency-region signal be multiply by after the conjugate complex number of this group channel frequency response estimated value, produces one of described M restituted signal.
24. diversity receiver as claimed in claim 23 is characterized in that, the corresponding channel parameter of each version input signal is the inverse that comprises one group of channel power estimated mean value and one group of noise power estimated mean value.
25. diversity receiver as claimed in claim 24, it is characterized in that, the soft position of each branch oppositely projection instrument is according to this group channel power estimated mean value, adjust decision boundary, this diversity merge cells is to described M soft position signal, multiply by the inverse of this group noise power estimated mean value respectively, to produce the signal after the M group multiplies each other.
26. diversity receiver as claimed in claim 4 is characterized in that, described merging comprises with reverse mapping device:
N multiplier is divided into each branch, receives a described M restituted signal, and multiply by corresponding channel parameter respectively, to produce the signal after the M group multiplies each other;
N the reverse projection instrument in soft position is divided into each branch, receives the signal after described M group multiplies each other respectively, and the corresponding channel parameter of foundation produces the individual soft position of M signal with after adjusting decision boundary respectively; And
One addition and multiplexer are the channel conditions according to a described N branch, and to described M soft position signal, the merging of execute bit level or selection computing are to be output as the described more positive signal for the treatment of;
Wherein, the channel equalizer of each branch be with frequency-region signal divided by after corresponding this group channel frequency response estimated value, produce one of described M restituted signal.
27. diversity receiver as claimed in claim 26, it is characterized in that, after the channel condition information estimator acquisition frequency-region signal of each branch, produce this group channel frequency response estimated value and channel parameter, and this channel parameter is to comprise one group of signal noise ratio estimated mean value, or one group of subcarrier signal noise ratio estimated value.
28. diversity receiver as claimed in claim 26, it is characterized in that, described demodulating equipment more comprised an automatic gain control unit before the fast fourier transform circuit of each branch, in order to amplify or the time domain signal of decaying, and the channel condition information estimator of each branch captures after this time-domain signal the generation channel parameter.
29. diversity receiver as claimed in claim 28 is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is produced by the channel equalizer of being located at this branch.
30. diversity receiver as claimed in claim 28, it is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is to be done to produce by the fast fourier transform circuit after the estimation of time domain channel impulse response by the channel condition information estimator of being located at this branch again.
31. diversity receiver as claimed in claim 28 is characterized in that, the corresponding channel parameter of each version input signal is to comprise one group of signal noise ratio estimated mean value that accords with first level.
32. diversity receiver as claimed in claim 4 is characterized in that, described merging comprises with reverse mapping device:
One diversity merge cells receives a described M restituted signal, and multiply by respectively corresponding channel parameter as weights with after producing the signal after the M group multiplies each other, again according to the channel conditions of a described N branch, carry out merge or the selection computing after exports; And
One soft position is projection instrument oppositely, is divided into each branch, the output signal of receive diversity merge cells, and DO symbol produces the described more positive signal for the treatment of after oppositely videoing.
33. diversity receiver as claimed in claim 32 is characterized in that, described diversity merge cells is more according to the corresponding channel parameter of each version input signal, carries out the merging of first level of symbol or subcarrier level or selects computing.
34. diversity receiver as claimed in claim 32 is characterized in that, after the channel condition information estimator acquisition frequency-region signal of each branch, produces this group channel frequency response estimated value and channel parameter.
35. diversity receiver as claimed in claim 34 is characterized in that, this channel equalizer of each branch be with frequency-region signal divided by after this group channel frequency response estimated value, produce one of described M restituted signal.
36. diversity receiver as claimed in claim 34, it is characterized in that, the corresponding channel parameter of each version input signal is to comprise one group of signal noise ratio estimated value, this group signal noise ratio estimated value is one group of signal noise ratio estimated mean value of the first level of symbol, or one group of subcarrier signal noise ratio estimated value of subcarrier level.
37. diversity receiver as claimed in claim 36, it is characterized in that, described soft position oppositely projection instrument is according to the summation of the corresponding signal noise ratio estimated value of described all branches or the summation of signal noise ratio estimated mean value, adjusts decision boundary and DO symbol and oppositely is output as the described more positive signal for the treatment of behind the reflection.
38. diversity receiver as claimed in claim 36, it is characterized in that, described soft position oppositely projection instrument is first divided by the summation of the corresponding signal noise ratio estimated value of all branches or the summation of signal noise ratio estimated mean value to the output signal of diversity merge cells, DO symbol is oppositely videoed again, is output as the described more positive signal for the treatment of after multiply by the summation of the summation of signal noise ratio estimated value of all branches or signal noise ratio estimated mean value at last.
39. diversity receiver as claimed in claim 32 is characterized in that, described demodulating equipment more comprised an automatic gain control unit before the fast fourier transform circuit of each branch, in order to amplify or the time domain signal of decaying.
40. diversity receiver as claimed in claim 39 is characterized in that, the channel condition information estimator of each branch captures after this time-domain signal, produces channel parameter.
41. diversity receiver as claimed in claim 40 is characterized in that, the channel equalizer of each branch be with frequency-region signal divided by after this group channel frequency response estimated value, produce one of described M restituted signal.
42. diversity receiver as claimed in claim 40 is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is produced by the channel equalizer of being located at this branch.
43. diversity receiver as claimed in claim 40, it is characterized in that, corresponding this group channel frequency response estimated value of each version input signal is to be done to produce by the fast fourier transform circuit after the estimation of time domain channel impulse response by the channel condition information estimator of being located at this branch again.
44. diversity receiver as claimed in claim 41 is characterized in that, the corresponding channel parameter of each version input signal is one group of signal noise ratio estimated mean value.
45. diversity receiver as claimed in claim 44, it is characterized in that, the reverse projection instrument in soft position is the summation according to the signal noise ratio estimated mean value of described all branches, adjusts decision boundary and DO symbol and oppositely is output as the described more positive signal for the treatment of behind the reflection.
46. diversity receiver as claimed in claim 44, it is characterized in that, soft position oppositely projection instrument to the output signal of diversity merge cells earlier divided by the summation of the signal noise ratio estimated mean value of all branches, DO symbol is oppositely videoed again, and the summation that multiply by the signal noise ratio estimated mean value of all branches at last is output as afterwards the described more positive signal for the treatment of.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510117306 CN1960200A (en) | 2005-11-01 | 2005-11-01 | Diversity receiver |
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| CN 200510117306 CN1960200A (en) | 2005-11-01 | 2005-11-01 | Diversity receiver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119666A (en) * | 2015-07-13 | 2015-12-02 | 中国电子科技集团公司第十研究所 | Channel quality adaptive joint estimation method |
| US10720953B1 (en) | 2019-05-30 | 2020-07-21 | Shure Acquisition Holdings, Inc. | Scalable diversity deployment for wide tuning range transceiver |
| US12003269B2 (en) | 2022-04-11 | 2024-06-04 | Shure Acquisition Holdings, Inc. | Scalable diversity deployment for wide tuning range transceiver |
-
2005
- 2005-11-01 CN CN 200510117306 patent/CN1960200A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119666A (en) * | 2015-07-13 | 2015-12-02 | 中国电子科技集团公司第十研究所 | Channel quality adaptive joint estimation method |
| CN105119666B (en) * | 2015-07-13 | 2017-08-04 | 中国电子科技集团公司第十研究所 | The method that adaptive combined channel estimates channel quality |
| US10720953B1 (en) | 2019-05-30 | 2020-07-21 | Shure Acquisition Holdings, Inc. | Scalable diversity deployment for wide tuning range transceiver |
| US11303317B2 (en) | 2019-05-30 | 2022-04-12 | Shure Acquisition Holdings, Inc. | Scalable diversity deployment for wide tuning range transceiver |
| US12003269B2 (en) | 2022-04-11 | 2024-06-04 | Shure Acquisition Holdings, Inc. | Scalable diversity deployment for wide tuning range transceiver |
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Application publication date: 20070509 |