CN1152539C - Eight-phase PSK modulation method and device - Google Patents
Eight-phase PSK modulation method and device Download PDFInfo
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- CN1152539C CN1152539C CNB011132469A CN01113246A CN1152539C CN 1152539 C CN1152539 C CN 1152539C CN B011132469 A CNB011132469 A CN B011132469A CN 01113246 A CN01113246 A CN 01113246A CN 1152539 C CN1152539 C CN 1152539C
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Abstract
The present invention discloses an eight-phase PSK modulation method and a device thereof. In the method, a new modulation vector after simple 8PSK modulation and phase rotation is stored in a modulation phase table to compress the modulation phase table by quadruple; after a code element is input, a new modulation vector is obtained by table lookup and data processing; then, forming and wave filtration are carried out by an RAM factor wave filter; finally, a modulation signal of the new modulation vector is output. The device of the present invention is completely compatible with a GSM system. The device can supply sufficient data service capability and can sufficiently extend a life cycle of the existing GSM system. As for an operator, investment is saved, and competitive service can be supplied.
Description
Technical field
The present invention relates to digital mobile communication, more specifically refer to be used to strengthen eight-phase PSK modulation method and the device thereof of data transfer rate type GSM (EDGE).
Background technology
The second generation mobile communication system that with GSM is representative is the main flow business with the speech.But along with the high speed of the Internet (Internet) emerges, move the growing extensive attention that causes industry of technology such as inserting the Internet, ecommerce, mobile computing, the demand develop rapidly of the data communication by wireless air interface, the data service of mobile network is generally had an optimistic view of.But the standard data rate with present GSM is the 9.6kbps/ time slot, can not satisfy above-mentioned
The demand that technology is growing to mobile data communication.
For this reason, International Telecommunication Union is organizing the standard formulation of the 3-G (Generation Three mobile communication system) that high speed data transfer can be provided.In view of second generation GSM has set up huge basic network and had the flood tide user, development trend from now on is that both will coexist in the long duration.For to the 3-G (Generation Three mobile communication system) transition, ETSI (ETSI) is on the basis of structure of time slot that keeps the GSM air interface and frequency range, take evolution step stage by stage: the phase I has proposed high speed circuit switched data (High-Speed Circuit SwitchData HSCSD) and two kinds of mode of operations of GPRS (General Packet Radio Service GPRS), to improve data communication capacity; Second stage strengthens data transfer rate type GSM (Enhanced Datarates for Global/GSM Evolution EDGE, down together), and it adopts efficient modulation techniques (eight phase phase-shift keying) to make transmission rate be increased to 3 times.
Strengthen data transfer rate type GSM and be based on that GSM grows up.Still adopt the frequency partition of original frequency spectrum and 200K, can realize compatible with GSM easily.It mainly by changing modulation system, realizes the data service up to 384kbps.Simultaneously, strengthen the support that data transfer rate type GSM has also obtained North America IS-136 TDMA.In packet domain, the air interface that strengthens data transfer rate type GSM and IS-136 is compatible fully, makes it to become the unified TDMA standard in the whole world.
Eight phase phase-shift keyings modulation belongs to linear modulation, and Fig. 1 has illustrated the general linear modulated process, realizes that usually linear modulation all adopts shaping filter method or look-up method.The shaping filter method need adopt the fixed-point multiplication device.But the circuit of realizing shaping filter with multiplier is complicated, and it is bigger to take resource, and power consumption is bigger, and the signal quality that computing obtains through fixed-point multiplication is poor than table look-at also; And look-up table needs all sampled values of modulation signal are stored in the form fully, and it is bigger again to take memory space.
Summary of the invention
The objective of the invention is shortcoming at above-mentioned shaping filter method and full look-up table existence, another kind of eight-phase PSK modulation method and device are proposed, this method and apparatus is on the basis that combines above-mentioned two kinds of method advantages, both saved resource, reduce base station system complexity and power consumption again, and high-precision digital signal can be provided.
To achieve these goals,
Eight-phase PSK modulation method of the present invention will be stored in the phase modulation form through the new modulating vector that obtains after simple eight phase phase shift modulation and the phase place rotation, and according to the trigonometric function rule modulation phase meter lattice is carried out four multiplication of voltages and contract; Code element is carried out sign map after importing successively, the address of tabling look-up produces, looks into the chopping phase bit table; Then, utilize the RAM coefficient filter to finish shaping filter; Export its modulation signal at last.
Eight phase phase-shift keying modulating devices of the present invention comprise successively the code element input unit, sign map unit, the address-generation unit of tabling look-up that connect, look into phase modulation table unit and RAM coefficient filter, wherein,
The signal of sign map unit code element input unit input is finished the sign map function;
The symbolic vector that the address-generation unit of tabling look-up is exported the sign map unit is converted to symbolic address, constitutes the address of tabling look-up of looking into the phase modulation table unit;
Look into the phase modulation table unit and handle with the table look-up line data of going forward side by side of symbolic address, output is through simple eight phase phase shift modulation and the postrotational new modulating vector of phase place;
The RAM coefficient filter forms filtering to new modulating vector, and output is through the homophase and the orthogonal signalling of linear digital modulation.
Because the present invention has adopted above-mentioned eight-phase PSK modulation method and device according to strengthening data transfer rate type GSM regulation, has proposed RAM coefficient filters solutions, and form wherein compressed, then, utilize the RAM coefficient filter to form filtering, export its modulation signal at last.This method has greatly reduced complexity, obtains the very high modulation signal of accuracy.And its modulating device can have been reserved on existing BTS hardware strengthening the support of data transfer rate type GSM, system compares with third generation mobile, method and apparatus of the present invention, to the system reform amount among the GSM minimum and with existing gsm system compatibility, simultaneously enough data service abilities can be provided again, the life cycle of existing GSM system can be fully prolonged, operator, both save investment, can provide competitive business service again.
Description of drawings
Fig. 1 is existing linear digital modulation principle block diagram.
Fig. 2 is the inventive method modulation principle figure.
Fig. 3 is the inventive method block diagram.
Fig. 4 utilizes the inventive method modulation back homophase, orthogonal signalling polar plot.
Fig. 5 is a RAM coefficient filter structural representation block diagram of the present invention.
Fig. 6 is the signal spectrum performance plot that utilizes after the inventive method is modulated.
Fig. 7 is the block diagram that is applied to behind the digital up converter of the present invention.
Embodiment
According to GSM05.04 (V8.0.0) agreement, to the regulation of eight phase phase-shift keying modulation systems among the EDGE, the baseband modulation process can be divided into three steps, that is: 1. simple 8 phase modulated; 2. symbol rotation; 3. forming filter C0 (t) filtering.Therefore, the new modulating vector that obtains through the 1st, 2 steps is the forming filter filtering of C0 (t) by impulse response, just obtains the baseband modulation signal y (t) of eight phase phase-shift keyings:
By above analysis as can be known:
From the mathematic(al) representation angle, baseband signal y (t) is new modulating vector
Carrying out the discrete signal convolution with the forming filter C0 (t) that postpones (5/2Ts) obtains.
Please in conjunction with Fig. 2, the angle from realizing modulating can be: with new modulating vector with the filter action equivalence of forming filter
By the linear system of a transfer function h (t)=C0 (t), postpone then (5/2Ts), promptly realized the convolution algorithm of mathematic(al) representation.The effect equivalence of the forming filter that requires in the agreement is become the convolution process of a linear system.
Based on above analysis result, available RAM coefficient filtering (claiming RCF filtering again, down together) realizes strengthening the eight phase phase-shift keyings modulation of data transfer rate type GSM regulation.Just with new modulating vector
Finish convolution of function with the RAM filter, obtain eight phase phase-shift keying baseband modulation signals, its key will be considered following 2 points:
1, generates new modulating vector, directly obtain new modulating vector from the incoming symbol vector.
2, adopt the RAM coefficient filter to realize shaping filter C0 (t) function.
Because filtering is actually the process of a convolution, and the RAM coefficient filter can be finished convolution of function automatically.Therefore, modulator approach of the present invention is to be stored in the phase modulation form through the new modulating vector that obtains after simple eight phase phase shift modulation and the phase place rotation, and according to the trigonometric function rule modulation phase meter lattice are carried out four multiplication of voltages and contract, after the code element input, by table look-up and data processing obtain new modulating vector, then, utilize the RAM coefficient filter to finish shaping filter, export modulated baseband modulation signal (I/Q) at last.
See also shown in Figure 3ly, this method further comprises sign map successively, the address of tabling look-up produces, looks into output modulation signal step after chopping phase bit table, the filtering of RAM coefficient.
Described sign map is to use a Gray (GRAY) sign indicating number mapping and binary digital signal is become the symbolic vector with same magnitude, out of phase.
It is to be mapped as symbolic address through the symbolic vector that sign map produced that the described address of tabling look-up produces.
The described chopping phase bit table of looking into is meant and searches the chopping phase bit table that contracts through four multiplication of voltages that the output with this chopping phase bit table obtains a new modulating vector according to compression rule restore data again.
The filtering of described RAM coefficient is homophase and the orthogonal signalling (I and Q) of utilizing the RAM coefficient filter that new modulating vector is formed filtering and exporting eight phase phase-shift keyings modulation.
Fig. 4 has illustrated to utilize the baseband I that obtains after the modulator approach of the present invention and the vector of Q signal, and this figure has illustrated that the vector that utilizes the baseband I that obtains after the modulator approach of the present invention and Q signal meets the requirement of GSM05.04 (V8.0.0) agreement regulation.
Refer again to shown in Figure 3ly, according to above-mentioned modulator approach, modulating device of the present invention comprises successively the code element input unit, sign map unit, the address-generation unit of tabling look-up that connect, looks into phase modulation table unit and RAM coefficient filter, wherein,
The sign map function is finished to the signal of code element input unit input in the sign map unit;
The symbolic vector that the address-generation unit of tabling look-up is exported the sign map unit is converted to symbolic address, constitutes the address of tabling look-up of looking into the phase modulation table unit;
Look into the phase modulation table unit and handle with the table look-up line data of going forward side by side of symbolic address, output is through simple eight phase phase shift modulation and the postrotational new modulating vector of phase place;
The RAM coefficient filter forms filtering to new modulating vector, and output is through the homophase and the orthogonal signalling (I and Q) of modulation linearity digital modulation.
Please continue to consult shown in Figure 5, in the described RAM coefficient filter, comprise two data memory cell (DMM, down with), two multipliers, two accumulators, a coefficient storage unit (CMM, down with),
Wherein, two data memory cell are used to store the in-phase signal of new modulating vector, and another is used to store the orthogonal signalling of new modulating vector;
The coefficient storage unit is used to store the shaping filter factor;
In two multipliers, a shaping filter multiplication that is used for in-phase signal and coefficient storage unit, another is used for the shaping filter multiplication of orthogonal signalling and coefficient storage unit, and respectively as the input of two accumulators;
In two accumulators, in-phase signal after modulation that the product factor after above-mentioned in-phase signal and the shaping filter multiplication added up and export, another product factor after to above-mentioned orthogonal signalling and shaping filter multiplication add up and export orthogonal signalling after the modulation.
According to above-mentioned agreement regulation as can be known, the eight phase phase-shift keying modulating vectors that strengthen among the data transfer rate type GSM have only 16 limited states, only need a low capacity form, store the modulation signal state of this limited number.Import binary data to be modulated directly by tabling look-up, just can obtain simple eight phase phase shift modulation and the postrotational new modulating vector of phase place.
Fig. 3 has in fact also provided the process of searching new modulating vector table, what look into the output of chopping phase bit table is exactly the new modulating vector for the treatment of filtering, the code element input unit is a binary data generator at random, and this generator can be any digital data source, as speech coder.
In Fig. 5, data storage cell has stored the data-signal that filtering is treated in the front end input, this two paths of data simultaneously with coefficient memory in multiplication, through after the cumulative addition of certain number of times, the accumulated value of output is exactly each sampled value of eight phase phase-shift keying modulation signals to accumulator with all product factors.This shows, the RAM coefficient filter has been avoided needed a large amount of multiplier and adder etc. in common convolutional filtering process, greatly save resource, realize the process of shaping filter, and the coefficient of this filter design has the very big degree of freedom, thus select for use the RAM coefficient filter realize in the eight phase phase-shift keyings modulation shaping filter beyond doubt very advantageously.
Through the simulation study checking, the eight phase phase-shift keying modulated digital signal that adopt the inventive method to obtain satisfy enhancing data transfer rate type gsm protocol index request, its spectral characteristic as shown in Figure 6, curve C represents to strengthen data transfer rate type gsm protocol index, curve D is eight-phase PSK modulation method of the present invention and the resulting signal spectrum characteristic of device, and ordinate is a power spectral density, the dB of unit, abscissa is the frequency shift (FS) of baseband modulation signal, unit K Hz.
In sum, the present invention not only replaces the vector signal modulation operation with tabling look-up, and has compressed table content, has saved system resource; And the ingenious RCF filter construction that utilizes, replaced the desired a plurality of multipliers of convolution, adder etc., greatly saved system resource, and greatly reduce implementation complexity and system power dissipation, realize easy to be reliable, and signal accuracy height, this method has the following advantages:
1,, implementation complexity and system power dissipation have greatly been reduced with the replacement complex multiplication operation of tabling look-up.
2, the employing of RAM coefficient filter realizes shaping filter, has saved system resource greatly, and has greatly reduced system power dissipation and complexity.
3, greatly reduce the taking of system resource, strengthened the realizability of this method.
4, directly with storage behind simple modulation and the twiddle operation, there is not fixed-point multiplication to introduce the link of error, signal is more accurate.
5, can carry out the Filter Design of any coefficient easily according to user's different demands, this method has great flexibility, as long as change the RCF filter coefficient value, can realize other linear modulation easily.
6, the present invention has adopted digital mode, has guaranteed that the modulating data that this mode obtains has very high accuracy.
7, can be applicable to that any support strengthens in the base station system of data transfer rate type GSM.
Please continue to consult shown in Figure 7 at last, this figure is the application example of modulating device of the present invention, among the figure, unit 301 is modulating devices of the present invention, unit 302 is the cascade integral comb filters (CIC) with interpolation and low-pass filtering function, unit 303 is digital controlled oscillator (NCO), it produces the digital intermediate frequency oscillator signal of plural number (two-way quadrature), unit 304 is quadrature amplitude modulation unit (QAM), realize the digital multiplication function, unit 305 is buffering output units (OUT), realizes data buffering output.
Claims (7)
1, a kind of eight-phase PSK modulation method is characterized in that:
This method will be stored in the phase modulation form through the new modulating vector that obtains after simple eight phase phase shift modulation and the phase place rotation, and according to the trigonometric function rule modulation phase meter lattice is carried out four multiplication of voltages and contract; Code element is carried out sign map after importing successively, the address of tabling look-up produces, looks into the chopping phase bit table; Then, utilize the RAM coefficient filter to finish shaping filter; Export its modulation signal at last.
2, the method for eight phase phase-shift keyings as claimed in claim 1 modulation is characterized in that: described sign map is to use a Gray code mapping and binary digital signal is become the symbolic vector with same magnitude, out of phase.
3, the method for eight phase phase-shift keyings modulation as claimed in claim 1 is characterized in that: it is to be mapped as symbolic address through the symbolic vector that sign map produced that the described address of tabling look-up produces.
4, the method for eight phase phase-shift keyings modulation as claimed in claim 1, it is characterized in that: the described chopping phase bit table of looking into is meant and searches the chopping phase bit table that contracts through four multiplication of voltages that the output with this chopping phase bit table obtains a new modulating vector according to compression rule restore data again.
5, the method for eight phase phase-shift keyings modulation as claimed in claim 1 is characterized in that: the filtering of described RAM coefficient is homophase and the orthogonal signalling of utilizing the RAM coefficient filter that new modulating vector is formed filtering and exporting eight phase phase-shift keyings modulation.
6, a kind of eight phase phase-shift keying modulating devices is characterized in that: this device comprises successively the code element input unit, sign map unit, the address-generation unit of tabling look-up that connect, looks into phase modulation table unit and RAM coefficient filter, wherein,
The sign map function is finished to the signal of code element input unit input in the sign map unit;
The symbolic vector that the address-generation unit of tabling look-up is exported the sign map unit is converted to symbolic address, constitutes the address of tabling look-up of looking into the phase modulation table unit;
Look into the phase modulation table unit and handle with the table look-up line data of going forward side by side of symbolic address, output is through the new modulating vector of simple eight phase phase shift modulation and phase place rotation;
The RAM coefficient filter forms filtering to new modulating vector, and output is through the homophase and the orthogonal signalling of linear digital modulation.
7, eight phase phase-shift keying modulating devices as claimed in claim 6 is characterized in that: described RAM coefficient filter comprises two data memory cell, two multipliers, two accumulators, a coefficient storage unit,
Wherein, in two data memory cell, an in-phase signal that is used to store new modulating vector, another is used to store the orthogonal signalling of new modulating vector;
The coefficient storage unit is used to store the shaping filter factor;
In two multipliers, a shaping filter multiplication that is used for in-phase signal and coefficient storage unit, another is used for the shaping filter multiplication of orthogonal signalling and coefficient storage unit, and respectively as the input of two accumulators;
In two accumulators, in-phase signal after modulation that the product factor after above-mentioned in-phase signal and the shaping filter multiplication added up and export, another product factor after to above-mentioned orthogonal signalling and shaping filter multiplication add up and export orthogonal signalling after the modulation.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011132469A CN1152539C (en) | 2001-07-04 | 2001-07-04 | Eight-phase PSK modulation method and device |
| EP01983410A EP1324624A4 (en) | 2000-08-31 | 2001-07-30 | Method and apparatuses of 8psk modulation |
| PCT/CN2001/001213 WO2002028126A1 (en) | 2000-08-31 | 2001-07-30 | Method and apparatuses of 8psk modulation |
| AU2002214922A AU2002214922A1 (en) | 2000-08-31 | 2001-07-30 | Method and apparatuses of 8psk modulation |
| US10/373,485 US7236543B2 (en) | 2000-08-31 | 2003-02-24 | Method and apparatus of 8PSK modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011132469A CN1152539C (en) | 2001-07-04 | 2001-07-04 | Eight-phase PSK modulation method and device |
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| Publication Number | Publication Date |
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| CN1394048A CN1394048A (en) | 2003-01-29 |
| CN1152539C true CN1152539C (en) | 2004-06-02 |
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| CNB011132469A Expired - Fee Related CN1152539C (en) | 2000-08-31 | 2001-07-04 | Eight-phase PSK modulation method and device |
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| US7474608B2 (en) * | 2004-01-12 | 2009-01-06 | Intel Corporation | Method for signaling information by modifying modulation constellations |
| US7395495B2 (en) * | 2004-01-12 | 2008-07-01 | Intel Corporation | Method and apparatus for decoding forward error correction codes |
| WO2006045226A1 (en) * | 2004-10-29 | 2006-05-04 | Zte Corporation | Method and equipment adapted to 8psk equalization demodulation in edge system |
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