CN1505872A - Method for the correlate carrier joint detection - Google Patents
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- CN1505872A CN1505872A CNA028090527A CN02809052A CN1505872A CN 1505872 A CN1505872 A CN 1505872A CN A028090527 A CNA028090527 A CN A028090527A CN 02809052 A CN02809052 A CN 02809052A CN 1505872 A CN1505872 A CN 1505872A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/28—Systems using multi-frequency codes with simultaneous transmission of different frequencies each representing one code element
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/709—Correlator structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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Abstract
The present invention provides a method of correlated carrier joint detection, includes: the transmission side encodes and modulates the signal to be sent; the modulation and demodulation, as well as the encoding and decoding, is optimized through the joint detection, which allows the reception side to demodulate any two carriers when demodulating. The present method can obtain the signal from the present carrier in consideration of the influence of the adjacent carriers. With the help of similarity of the simplified algorithms, the complexity of the method can be similar to that of the OFDM. Therefore the correlated carrier joint detection can increase the system capacity and the efficiency of the frequency spectrum.
Description
A kind of method of correlated carrier joint detection
Technical field
The present invention relates to communication technical field, the more particularly to related time space frequency decoding scheme for communication system is concretely a kind of method of correlated carrier joint detection.Background technology
With developing rapidly for radio communication, user sharply increases so that PCS (PCS Personal Communications Systems）Bandwidth seem crowded to capacity, band resource turns into most valuable resource.The raising of band efficiency turns into most exigence.A kind of technology of more prevalence is that MIM0 (multiple-input, multiple-output are realized using aerial array at present）, MIM0 can reach the raising of spectrum efficiency really in theoretical and emulation, and particular content can be found in bibliography [1], [2], [3], [4], [5].Also there are some to simplify MIM0 systems, and its feasibility is demonstrate,proved by experiment-danger, particular content can be found in bibliography [6], [7], [8].Another technology is that traditional modulation-demodulation technique is improved to improve spectrum efficiency.Traditional modulation-demodulation technique transmits information using mutual nonoverlapping carrier wave; the distance between carrier wave is at least the width of single carrier wave; also it is separated from each other between these carrier waves with bandpass filter; because the characteristic of wave filter is undesirable; so that to have a protection band between carrier wave, therefore frequency band utilization rate is very low. OFDM
(particular content can be found in bibliography [9]) technology can use overlapped orthogonal frequency to be modulated demodulation, he no longer needs to add each carrier wave one wave filter to separate, and the distance between quadrature carrier is the half of single carrier wave width, so this technology greatly improves the availability of frequency spectrum, than the bandwidth that traditional modulation-demodulation technique saves nearly 50%.The cost that he is paid be exactly it is very strict to orthogonal frequency requirement, and system complexity than it is larger and non-linear the problems such as. S. B Weins tein
(particular content can be found in bibliography [12]) et al. proves that OFDM can be realized with FFT, greatly improves OFDM operating speed.Document [10] systematically describes OFDM various pieces and its application.The trend that both technologies are used in combination again now, document [11] gives the theoretical value of some MIM0- OFDM channel capacity.Other technology combines the CDMA technology of multicarrier system and current trend, referred to as CDMA multiple carrier, and illustrates that its spectrum efficiency improves a lot by emulating, referring to bibliography [13], [14], [15].
Work above all is all not involved with the situation of correlated carrier wave.If the distance of two carrier waves is also smaller than the half of single carrier wave width, conventional method and OFDM just have no idea to demodulate.The content of the invention
It is an object of the present invention to provide a kind of method of correlated carrier joint detection, to solve any two carrier wave（Including related and irrelevant）Demodulation problem, when two carrier dropouts are essentially independent（The distance between carrier wave is more than correlation bandwidth）, the present invention can reach approximately quadrature carrier（OFDM performance), if now the distance of the two carrier waves is also smaller than the half of single carrier wave width, this allows for availability of frequency spectrum raising further than OFDM.Simultaneously solve demodulation when complexity than it is larger the problem of, make its complexity approximate with OFDM.
The technical scheme is that：
A kind of method of correlated carrier joint detection, including：Signal to be sent is encoded, modulated by transmitting terminal, and received signal is demodulated, decoded by receiving terminal, it is characterised in that：Modulation /demodulation is optimized using joint-detection so that receiving terminal can be demodulated to any two carrier wave.More preferable measurement is provided to compiling decoding subsystem..Described use joint-detection is optimized to modulation /demodulation to be referred to：Metric is drawn using the metric calculation of joint-detection；So that in demodulation, the signal of this carrier wave can not only be obtained, and the influence of adjacent carrier can also be considered.
Good measurement make it that the measurement of correct signal is as far as possible small, and the measurement of other signals is tried one's best greatly；Coding and decoding can obtain more preferable metric.
The metric calculation of described use joint-detection show that metric refers to：
The metric calculation of described use joint-detection should meet following condition：
Metric =| - x\ xhi -x2' xh2 χ β^ ~κ,' \\2 +\\r2 -x2' xh2 - x[ xh、 x e 'W2' ||2 HI (xx xf - x[ χΗΊ) + (x2 xh2x ejW2~w'' -x2' xhzx eJW2—w'' ) + nx e~JWi' ||2
+ \\{xs xY1-x1' xV1) + ( , χΛ, x eJW'-W2'― x[ xh、x e ~W2' ) + nx e'^2' ||2It can be seen that ideal combination detection needs the channel estimation of sample stage to calculate x2 xh2xeJ^', but the fading coefficients of each sampled value can not possibly be provided among real system, but the fading coefficients of the channel within the time of a symbol can be approx thought in slow fading channel
It is a constant, is now so better realized in Practical Project；We obtain an approximate metric calculation method of simplification below：
Metric =|| -JCJ Λι x A2 x fx ||2 
Wherein i is local modulated signal, and 2 be the fading coefficients of carrier wave 1,2,Ι =^ ^7 and/2 =^It is the coefficient relevant with frequency, a symbol is received every time, need only be calculated once；It can be seen that he only more than OFDM coefficient/； f2, with its amount of calculation in an order of magnitude.
The present invention can also be optimized to coding and decoding, both：The signal is interleaved so that joint-detection can reach approximately the performance that OFDM handles quadrature carrier.Described being optimized to coding and decoding can also be optimized using convolutional code or Trel l i s codes or Turbo code etc. to coding and decoding；75 full-rate codes are used only herein and vi terbi are decoded, and does not encode and linearly decodes to coding and decoding to verify the performance of joint demodulation.The invention provides a kind of method of correlated carrier joint detection, any two carrier wave is solved（Including related and irrelevant）Demodulation problem, when two carrier dropouts are essentially independent（The distance between carrier wave is more than correlation bandwidth）, the present invention can reach approximately quadrature carrier（OFDM performance), if now the distance of the two carrier waves is also smaller than the half of single carrier wave width, this allows for availability of frequency spectrum raising further than OFDM.This method can not only obtain the signal of this carrier wave in demodulation, while being additionally contemplates that influence of the adjacent carrier to him, and by simplifying the approximate of algorithm, make its complexity close with OFDM.The effect for improving power system capacity and spectrum efficiency can be reached with the joint-detection of this correlated carrier wave.Brief description of the drawings
Fig. 1 is the overlapping schematic diagram of multiple carrier frequencies；
Fig. 1 is transceiver schematic diagram；
Fig. 3 is joint demodulation simulation curve figure.Embodiment
As shown in Fig. 1, we are emulated the situation only to 3 shown carrier waves（In fact any two carrier wave can be carried out joint-detection）.Fig. 2 is the transceiver schematic diagram of two carrier waves.By Fig. 1, Fig. 2 we can see that multicarrier system is divided into coding, modulates, demodulates, decoding this four part wherein coding/decoding system and modulation demodulation system certainly into a subsystem.We can respectively optimize to the two systems, optimization to coding/decoding system can use the blunt many technologies of existing ^, including Convolut ion code (convolutional code), Trel l i s code, Turbo code etc., we are only for the convenient comparison that multicarrier performance is carried out with OFDM systems herein, and using 75 full-rate codes, (vi terbi are decoded）Do not encode（Linear decoding）Two schemes.To the optimization of modulation demodulation system, our target is to provide more preferable metric to coding/decoding system.Good measurement has two features：The measurement of correct signal is as far as possible small；The measurement of other signals is tried one's best greatly.For existing modulation demodulation system, the situation of adjacent carrier is not considered typically, this requires mutually orthogonal between transmission carrier wave, or makes that distance is remote enough between carrier wave and carrier wave is separated using wave filter, it can just make not interfering between carrier wave, it is ensured that the correct demodulation of signal.And in wireless communications, due to Bandwidth-Constrained, want to improve capacity again（Pass letter rate）, attempt to transmit information using nonopiate carrier wave, so that the interference between necessarily introducing carrier wave, the metric of such correct signal is just not zero, this will necessarily make the hydraulic performance decline of decoder.A kind of ideal method is, signal is how by channel and to reach receiver in the case of no white Gaussian noise, how locally generated comparison signal is with regard to computing and obtaining a fiducial value, so in the case of no white Gaussian noise, the measurement one of correct signal is set to 0, and the minimum metric of other signals embodies the error correcting capability of encoding scheme.By simulation observation, this method can reach above-mentioned requirements really, but because locally generated signal process is excessively complicated（It need to modulate and multiply channel estimation demodulation）And the perfect channel estimation in sample stage need to be provided, it can not be used certainly among real system, but a kind of best situation can be provided in theory to analyze, when realizing, we can carry out approximate and simplify to algorithm, enable its amount of calculation to allow real system to be stood.We analyze situation of the receiver by signal below
The receiver of system is such：
Receive signal ^^；^+^^ ^^^+^ (the sums of two intermediate-freuqncy signals）
Wherein ^ and/be sampled value fading factor
Handle for convenience, we first demodulate signal
After being demodulated with carrier wave 1ri ^X{ x +x2xh2x ejwAfter ^' is demodulated with carrier wave 2r2 = χ2 x 2 + x x ejn' +nx e-jW2tIt is the symbol level fading factor by statistical average, ^^ that it, which neutralizes ^,7And ^7It is that thermal noise is produced,xA2 Xe, ' andXi xAi xe,->It is the interference between side frequency.
Here we introduce joint-detection and individually demodulation（OFDM concept), we first look at their metric calculation method（Measurement between correct signal）
It is according to the metric calculation method metric that OFDM is individually demodulated
Metric =\\ r, - x[ x A, ||2 +\\r2 -x2' x h2 ||2
=|| x, xhi - x[ xh^ + x2 x h2 x ejn' +nx e~jw'' ||2 +\\x2 xh2 x^ + , χΛ, x e —W2'+nxe ~ it can thus be seen that individually demodulating only needs to provide the channel estimation of symbol level, the method of this metric calculation is similar to the situation that decoding is demodulated to orthogonal frequency, if thinking without white Gaussian noise, should be just after the demodulation of signal carrier wave 1 received； cl X, should be just X h after being demodulated with carrier wave 22.And actual conditions not so, should also include one and disturb.If orthogonal between carrier wave, interference is zero, either large or small with changes in channel characteristics if non-orthogonal.Demodulate in this way, even if find correct signal value（X x, and ^=), its measurement is still not zero.So with the change of the characteristic of channel, it is difficult to ensure that metric of the metric of correct signal forever than other signals is small, just it is more difficult to ensure the correctness of decoding certainly.Simulation result below also illustrate that, if two carrier waves are nonopiate, even if noise is small again, and decoding can also malfunction.Metric calculation method method below us just takes this distracter into account.
It is according to the metric calculation method metric of joint-detection,
Metric =|r, -x[xhi -x2' xh2 x ejW2'w>l +\\r2 - x2' xhi - x\ xh、 x e Jw>~W2' ||2
HI (Λ:, x ^ - x\ x^) + (x2 h2 x x h2 xeJW2'w'') + nxe' ' ||2
+ \\(xs xh^-x2' V2) + (X] xh{ x ejWi-^' - x[ x Λ, xeJw'-W2') + nxe'^1 ||2It can be seen that ideal combination detection needs the channel estimation of sample stage to calculate
x2 h2xe^)l, but the fading coefficients of each sampled value can not possibly be provided among real system, and the fading coefficients that we can also be approximately considered the channel within the time of a symbol in slow fading channel are a constant, jtb0tAi X e^-2) =^x e (-v,-2) ', so just better realized in engineering.We obtain an approximate metric calculation method of simplification below.
Metric
x Ai x 2 l
Wherein χ is local modulated signal, and 2 be the fading coefficients of carrier wave 1,2（Available channel estimation is obtained）,/i:^^ and/2=^^ is the coefficient relevant with frequency, and a symbol is received every time, need only be calculated once.It can be seen that a coefficient/and its amount of calculation are in an order of magnitude only more than OFDM.
As shown in figure 3, simulation result is as follows：
Wherein 1.0E-7 is exactly the 0 of simulation result (to facilitate logarithm to represent）.
All of above simulation result is emulated under the following conditions：
Translational speed is 5km/h;
Channel model（Single path fading channel）
The code sequence length of convolutional code is+2 pseudo-symbols of 512 symbols；
QPSK is modulated；
The symbol of channel interleaving length 9800；
Statistic 107Individual point；
Channel estimation uses perfect channel estimation.
As seen from Figure 3, for full-rate codes scheme：Correlated carrier wave can not be demodulated with OFDM method, because no matter how high signal to noise ratio is, the very high bit error rate will occur, can reach approximately the performance that OFDM handles quadrature carrier with joint-detection, especially be reached unanimity by intertexture in high s/n ratio with OFDM.
For not encoding scheme：There is similar result with encoding scheme.Under square one, encoding scheme is not more much better than full-rate codes scheme.In high s/n ratio, this gap is gradually reduced.
The improvement to the performance of system that interweaves is just effective only under very high signal to noise ratio, under the signal to noise ratio of the ^ third constellations
Performance is worse on the contrary（It, because the error-correcting performance of full-rate codes is very poor, is, using intertexture, to homogenize mistake, so as to expand error code scope in low signal-to-noise ratio that this, which is probably,）.
It can be drawn to draw a conclusion by emulation made above：It is 1/4 pairwise correlation carrier system of bandwidth for frequency phase-difference, it can not be worked using only independent demodulation, joint-detection must be used just to make system worked well, and the performance approximate with OFDM 2 quadrature carriers of processing can be reached, and the computation complexity brought is more or less the same with OFDM.The effect for improving power system capacity and spectrum efficiency can be reached with the joint-detection of this correlated carrier wave.
The invention provides a kind of method of correlated carrier joint detection, any two carrier wave is solved（Including related and irrelevant）Demodulation problem, when two carrier dropouts are essentially independent（The distance between carrier wave is more than correlation bandwidth）, the present invention can reach approximately quadrature carrier（OFDM performance), if now the distance of the two carrier waves is also smaller than the half of single carrier wave width, this allows for availability of frequency spectrum raising further than OFDM.This method can not only obtain the signal of this carrier wave in demodulation, while being additionally contemplates that influence of the adjacent carrier to him, and by simplifying the approximate of algorithm, make its complexity close with OFDM.The effect for improving power system capacity and spectrum efficiency can be reached with the joint-detection of this correlated carrier wave.
Above embodiment is to illustrate the invention and not to limit the present invention.
Bibliography of the present invention is as follows：
[1] Winters, J.H., " On the capacity of radio communication systems with diversity in a Rayleigh fading environment; " IEEE Journal on Selected Areas in Communications, vol. SAC-5, No. 5, June 1987, pp. 871-878.
[2] Foschini, G.J. and Gans, M.J., " On limits of wireless communications in a fading environment when using multiple antennas; " Wireless Personal Communications, vol. 6, No. 3, March 1998, pp. 311-335.
[3] Driessen, P.F. and Foschini, G.J., "On the capacity formula for multiple-input multiple-output wireless channels: a geometric interpretation," IEEE Transactions on Communications, vol. 47, No. 2, Feb. 1999, pp. 173-176.
[4] Shiu, D., Foschini, J.G., Gans, M. and Kahn, J.M., "Fading and its Effect on the Capacity of Multi-Element Antenna Systems," Proceedings IEEE International Conference on Universal Personal Communication (ICUPC 98), 1998, Florence, Italy, vol. 1 , pp. 429-433.
[5] Marzetta, T.L. and Hochwald, B.M., "Capacity of a mobile multiple-antenna communication link in Rayleigh flat fading," IEEE Transactions on Information Theory, vol. 45, No. 1, Jan. 1999, pp.139-157.
[6] Foschini, G.J., " Layered space-time architecture for wireless communication in a fading environment when using multiple antennas; " Bell Labs Technical Journal, vol. 1, No. 2, Autumn 1996, pp. 41-59.
[7] Foschini, G.J., Golden, G.D., Valenzuela, R.A. and Wolniansky, P.W., "Simplified processing for wireless communication at high spectral efficiency," IEEE Journal on Selected Areas in Communications - Wireless Commununications Series -, vol. 17, No. 11 , Nov. 1999, pp. 1841-1852.
[8] Wolniansky, P.W., Foschini G.J., Golden G.D. and Valenzuela, R.A., "V-BLAST: an architecture for achieving very high data rates over the rich-scattering wireless channel," Proceedings of International Symposium on Signals, Systems, and Electronics (ISSSE-98), Pisa, Italy, Oct. 1998, pp. 295-300.
[9] Robert W.Chang, Eatontown,N. J., "Orthogonal Frequency Multiplex Data
Transmission System" Filed Nov.14 1966,Ser.no.594,042 United States Patent Office
[10] Richard van Nee and Ramjee Prasad ,"OFDM Wireless Multimedia Communications"
[l l]Helmut Bolcskei,David Gesbert and Arogyaswami J.Paulraj "On the capacity of OFDM-Based Spatial Multiplexing Systems" IEEE Tran. On Com VOL 50, NO.2 February 2002
[12] S.B.Weinstein, Member, IEEE and Paul M.Ebert,Member,IEEE "Data Transmission by Frequency-division Multiplexing Using the Discrete Fourier Transform" IEEE Tran. On Com VOL COM- 19 No.5 October 1971
[13]S. Kondo and L. B. Milstein, "Performance of multicarrier DS CDMA
systems," IEEE Trans. Commun., vol. 44, pp. 238-246, Feb. 1996.
[14]E. A. Sourour and M. Nakagawa, "Performance of orthogonal multicarrier
CDMA in a multipath fading channel," IEEE Trans. Commun., vol.
44, pp. 356-367, Mar. 1996.
[15]Q. Chen, E. S. Sousa, and S. Pasupathy, "Multicarrier CDMA with
adaptive frequency hopping for mobile radio systems," IEEE J. Select.
Areas Commun., vol. 14, pp. 1852-1858, Dec. 1996.
Claims (5)
- Claim1. a kind of method of correlated carrier joint detection, including：Signal to be sent is encoded, modulated by transmitting terminal, and received signal is demodulated, decoded by receiving terminal, it is characterised in that：Modulation /demodulation is optimized using joint-detection so that receiving terminal can be demodulated to any two carrier wave.2. according to the method described in claim 1, it is characterised in that described use joint-detection is optimized to modulation /demodulation to be referred to：Metric is drawn using the metric calculation of joint-detection；So that in demodulation, the signal of this carrier wave can not only be obtained, and the influence of adjacent carrier can also be considered；Joint-detection can make the measurement of correct signal as far as possible small, and the measurement of other signals is tried one's best greatly；So as to provide more preferable metric to coding/decoding system.3. method according to claim 2, it is characterised in that the metric calculation of described use joint-detection show that metric refers to：Metric is drawn using the simplification metric calculation of joint-detection, it should meet following condition：Metric =|| - x[ xln - x2' x h2 x /\ ||2 +|| r2 - ^ x A2 - x\ x Ai x f21|2Wherein it is local modulated signal, is the fading coefficients of carrier wave 1,2,/ι =^ and/2 =^ ^ are the coefficients relevant with frequency, and a symbol is received every time, need only be calculated once.4. method according to claim 2, it is characterised in that the metric calculation of described use joint-detection show that metric refers to：The metric calculation of described use joint-detection should meet following condition：Metric =| r, - x[ hi -x2' xh2 x eJW2~Wl' ||2 +\\r2 -x2' xh2 - x\ xA, x ejW]~W2' ||2 =|| (x^ xh^- x[ xhi) + (x2 x/i2 x eJW2~Wi' -x2' xh2 x eJW2'Wl' ) + ηχ β~ ' ||2+ xh^-x2' xh^) + (X] Λ, x eiw^' - x xA, x e„' ) + nx e~JW2' ||2It can be seen that ideal combination detection needs the channel estimation of sample stage to calculate x2xh2 eJ^', but the fading coefficients of each sampled value can not possibly be provided among real system, but can approx think that the fading coefficients of the channel within the time of a symbol are a constant, now/^ X in slow fading channele = ]ΓΧ e ./( w , - w 2 ) (, so in Practical Project Better realize；We obtain an approximate metric calculation method of simplification below：Metric =|| rx -- xi' 'xhi x f2 \\2
Wherein i is local modulated signal, is the fading coefficients of carrier wave 1,2,/ι =^ and 2 =^ is the coefficient relevant with frequency, and a symbol is received every time, need only be calculated once；It can be seen that he only more than OFDM coefficient/；/2, with its amount of calculation in an order of magnitude.5. the method according to Claims 1-4 any one, it is characterised in that the signal can be interleaved so that joint-detection can reach approximately the performance that OFDM handles quadrature carrier.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2002/000217 WO2003083598A1 (en) | 2002-03-29 | 2002-03-29 | Method for the correlate carrier joint detection |
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| DE19549148A1 (en) * | 1995-12-29 | 1997-07-03 | Siemens Ag | Method and arrangement for radio transmission of digital signals |
| EP1069707A1 (en) * | 1999-07-13 | 2001-01-17 | Motorola, Inc. | Transmit diversity transmitter and receiver for radio communications systems |
| JP2001285254A (en) * | 2000-03-28 | 2001-10-12 | Matsushita Electric Ind Co Ltd | Communication unit and its method |
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| AU2002250786A1 (en) | 2003-10-13 |
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