CN105376190A - Communication method based on GMSK modulation and method for detecting fixed frequency - Google Patents
Communication method based on GMSK modulation and method for detecting fixed frequency Download PDFInfo
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Abstract
The invention relates to a communication method based on GMSK modulation and a method for detecting a fixed frequency. The communication method based on GMSK modulation comprises the steps of performing GMSK modulation on an input signal for obtaining a first modulated signal; transmitting the first modulated signal through a channel with a preset frequency, wherein if the preset frequency is the fixed frequency, transmitting through a 8PSK channel with the preset frequency, and if the preset frequency is the frequency except for the fixed frequency, transmitting through the GMSK channel with the preset frequency, wherein the fixed frequency is integer times of that of a clock signal. The communication method based on GMSK modulation can improve performance in transmitting the GMSK modulated signal.
Description
Technical field
The present invention relates to the communications field, particularly a kind of communication means based on GMSK modulation and a kind of method that fixed frequency is detected.
Background technology
Digital modulation technique is the important component part of digital cellular mobile communication systems air interface.Under different cell radius and applied environment, mobile communication will present different attenuation characteristics.Under the given channel conditions, the efficient modulation mode finding superior performance is important research topic always.
Global system for mobile communications (GlobalSystemforMobilCommunication, hereinafter referred to as gsm system) is one of main cellular system.Single channel baseband modulation process chip for the exploitation of gsm system transmitter completes the baseband modulation process of gsm system.
Single channel baseband modulation process chip is one piece of digital-to-analogue chip, according to Schema control and modulation system control signal, can select the modulation system that current time slots is correct, chip can carry out GMSK modulation (GaussianMinimum-Shift-Keying) and 8PSK modulation (8Phase-ShiftingKeying).
The principle of GMSK modulation is, baseband signal obtains intermediate-freuqncy signal after GMSK modulation, then through radio-frequency transmissions, wherein, GMSK modulation added Gauss's low pass pre-modulation filter and realizes before MSK modulator, defined GMSK modulation mode in agreement GSM05.04V8.0.0.GMSK signal has narrower bandwidth, meets the strict demand to out-of-band radiation in mobile communication.8PSK modulation is digital phase moudlation, and its principle mainly uses baseband digital signal to modulate carrier phase.8 phase keyings have the higher availability of frequency spectrum, stronger anti-interference.8PSK modulation mode is also defined in agreement GSM05.04V8.0.0.
The main circuit of single channel baseband modulation process chip will comprise: GMSK modulation module, 8PSK modulation module, clock generating module, and, export and select module.Wherein:
GMSK modulation module completes the GMSK modulation function to input data to be modulated, and 8PSK modulation module completes the 8PSK modulation function to described input data to be modulated; Input selection module inputs according to modulating mode mode and GMSK/8PSK, selects to export GMSK modulation signal or 8PSK modulation signal.Clock generating module produces the various clock signals of data inside chips circuit part.
But GMSK radio-frequency channel can be subject to the interference of clock signal in chip, cause the emitting performance of GMSK radio-frequency channel not good enough, communication quality is poor, affects the reception of base station.
Summary of the invention
The technical problem that technical solution of the present invention solves is, how to improve the emitting performance of GMSK modulation signal.
In order to solve the problems of the technologies described above, technical solution of the present invention provides a kind of communication means based on GMSK modulation, and the method accepts the enable control of clock signal, comprising:
GMSK modulation is carried out to obtain the first modulation signal to input signal;
The channel of assigned frequency is used to send described first modulation signal, wherein, if described assigned frequency is fixed frequency, then the 8PSK channel of assigned frequency is used to send, if described assigned frequency is the frequency except described fixed frequency, then the GMSK channel of assigned frequency is used to send; Described fixed frequency is the integral multiple of described clock signal.
Optionally, described input signal is baseband signal.
Optionally, describedly GMSK modulation carried out to input signal comprise to obtain the first modulation signal:
Precoding is carried out to input signal;
Input signal after coding is carried out filtering through Gaussian filter;
MSK modulation is carried out to filtered signal, to obtain described first modulation signal.
Optionally, described precoding is differential coding.
Optionally, the GMSK channel of specifying with described fixed frequency is subject to the interference of described clock signal.
Optionally, described interference is humorous wave interference.
Optionally, the 8PSK channel of described use assigned frequency carries out transmission and comprises:
8PSK upconversion process is carried out to obtain the modulation signal after processing to described first modulation signal;
Modulation signal after using the 8PSK channel of corresponding frequencies to send described process.
Optionally, described method also comprises:
8PSK modulation is carried out to obtain the second modulation signal to input signal;
The 8PSK channel of assigned frequency is used to send described second modulation signal.
Optionally, described to input signal carry out 8PSK modulation comprise to obtain the second modulation signal:
Input signal is divided into groups and is mapped to 8PSK symbol;
8PSK symbol is rotated and through molding filtration, modulates and obtain described second modulation signal.
In order to solve the problems of the technologies described above, technical solution of the present invention additionally provides a kind of method detected fixed frequency as above, comprising:
GMSK modulation is carried out to obtain detecting modulation signal to the detection signal of input;
The GMSK channel of assigned frequency is used to send described detection modulation signal;
If described GMSK channel is interfered, then obtaining frequency corresponding to this GMSK channel is described fixed frequency.
The beneficial effect of technical solution of the present invention at least comprises:
The GMSK channel frequency that technical solution of the present invention is disturbed by the subject clock signal detected, utilize the stationarity of these interference bands, when carrying out channels transmit to GMSK modulation signal, switch the 8PSK channel of GMSK modulation signal to fixing frequency, use these GMSK modulation signals of 8PSK channels transmit, thus the transmission disturbance avoided on GMSK channel frequency, improve the signal transmission performance under GMSK modulation pattern, preferred communication quality.
Technical solution of the present invention also can detect the GMSK channel frequency of subject clock signal interference, and obtain disturbed fixed frequency, in these fixed frequencies, GMSK modulation signal all adopts 8PSK transmission, optimizes communication quality further.
Accompanying drawing explanation
Fig. 1 is a kind of transmitter architecture schematic diagram;
A kind of communication means schematic flow sheet based on GMSK modulation that Fig. 2 provides for technical solution of the present invention;
A kind of GMSK modulation principle schematic that Fig. 3 provides for technical solution of the present invention;
The another kind that Fig. 4 provides for technical solution of the present invention is based on the communication means schematic flow sheet of GMSK modulation;
A kind of transmitter architecture schematic diagram that Fig. 5 provides for technical solution of the present invention;
The another kind of transmitter architecture schematic diagram that Fig. 6 provides for technical solution of the present invention.
Embodiment
In order to enable object of the present invention, characteristic sum effect becomes apparent more, elaborates to the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from mode described here to implement, therefore the present invention is not by the restriction of following public specific embodiment.
Known based on prior art, in GSM cell mobile communication systems, business divides speech business and data service two class.In wireless transmissions, no matter speech business or data service all have employed GMSK modulation mode.GMSK modulation has permanent envelope and the little advantage of out-of-band radiation, meet the demand of speech business and some low-speed data services, but it cannot adapt to the multimedia data service demand of development.
GSM evolution (EnhancedDataforGlobal/GSMEvolution, hereinafter referred to as the EDGE) system strengthening data rate is in order to GSM is to the communication standard of 3-G (Generation Three mobile communication system) transition.Its main purpose improves the transmission rate of data, realizes the steady evolution of 2G to 3G.Therefore, EDGE have employed the 8PSK modulation than GMSK modulation more high data rate, and under the prerequisite that character rate remains unchanged, the message transmission rate adopting 8PSK modulation technique to reach is 4 times of GMSK, and its relative GMSK modulation has stronger anti-interference.EDGE system can make full use of GSM resource, and current existing equipment major part can continue to use under EDGE.
A kind of transmitter architecture that GMSK modulation module basis increases 8PSK modulation module can with reference to figure 1, comprise: GMSK modulation module 10,8PSK modulation module 11, select output module 12, GMSK/8PSK signal delay module 13, clock generating module 14, synchronous and anti-shaking module 15, up-conversion, filtering and amplification module 16, and antenna 17.Wherein:
GMSK modulation module 10 carries out digital GMSK modulation, to export the Q baseband signal GMSK_Q after the I baseband signal GMSK_I after GMSK modulation, GMSK modulation to input data to be modulated (namely baseband signal).
8PSK modulation module 11 carries out digital 8PSK modulation to input data to be modulated (namely baseband signal), to export the Q baseband signal 8PSK_Q after I baseband signal 8PSK_I, the 8PSK modulation after 8PSK modulation.
Select output module 12 according to the input of the setting of modulating mode mode and GMSK/8PSK clock signal, select to export GMSK modulation signal (baseband signal GMSK_I and GMSK_Q) or 8PSK modulation signal (baseband signal 8PSK_I and 8PSK_Q); Modulating mode mode information refers to the selection of chip operation pattern, be generally the information of dibit: " 00 " is expressed as GMSK modulation pattern, " 01 " is expressed as 8PSK modulating mode, " 11 " represent that GMSK modulation pattern and 8PSK modulating mode switch according to described GMSK/8PSK clock signal and carry out, and " 10 " represent that chip carries out reserved state; GMSK/8PSK clock signal then defines the switching time slot of GMSK modulation pattern and 8PSK modulating mode.
Clock generating module 14 produces the various clock enable signal of chip inner module, comprising: chip master clock signal (not shown in figure 1), baseband signal input clock TXCLK and modulation signal output clock OCLK.
Synchronous and anti-shaking module 15 pairs of correlated inputs signals synchronously process, and carry out stabilization process to the asynchronous reset signal of input simultaneously, and in conjunction with the asynchronous reset signal that the power-on reset signal pio chip inside that electrify restoration circuit produces uses.The asynchronous reset signal of described input, effective when low level; The asynchronous reset signal that described chip internal uses is chip global reset signal.
Up-conversion, filtering and amplification module 16 carry out GMSK up-conversion or 8PSK up-conversion, filtering and amplification to the GMSK modulation signal selecting output module 12 to export or 8PSK modulation signal, and select corresponding GMSK to launch channel or 8PSK transmitting channel, launched by antenna 17.
Up-conversion, filtering and amplification module 16 are also the inputs of setting according to modulating mode mode and GMSK/8PSK clock signal, GMSK up-conversion, filtering and amplification are carried out to GMSK modulation signal, and select corresponding GMSK to launch channel, launch GMSK signal by antenna 17; Or, 8PSK up-conversion, filtering and amplification are carried out to 8PSK modulation signal, and select corresponding 8PSK to launch channel, launch 8PSK signal by antenna 17.
But, for GMSK modulation and transmitting, the signal quality of transmitter depends on the phase noise of clock signal to a great extent, launch on channel for the GMSK consistent with described clock signal duty frequency, clock signal easily carries out information interference to the GMSK channel of corresponding frequency, causes the decline of communication quality.
This application provides a kind of communication means based on GMSK modulation, can above-mentioned transmitter be applicable to, avoid the impact that above-mentioned clock signal is launched GMSK signal.
As shown in Figure 2, the method comprises:
Step S100, carries out GMSK modulation to obtain GMSK modulation signal to input signal.
In this step, described input signal is baseband signal, is a line Serial No..
GMSK modulation principle can with reference to figure 3, first, the conveniently demodulation of GMSK modulation signal, need to carry out precoding (being generally differential coding) based on encoder 20 to input data, secondly, use gauss low frequency filter 21 to carry out filtering, then use modulator 22 to carry out minimum shift keying (MinimumFrequency-shift-keying to filtered signal, hereinafter referred to as MSK) modulation, to obtain described GMSK modulation signal.MSK modulation is to signal constant envelope Continuous Phase Modulation.
In above-mentioned transmitter, achieve GMSK modulation in GMSK modulation module 10, described GMSK modulation module 10 can use the encoder 20 shown in Fig. 3, gauss low frequency filter 21 and modulator 22 to form.
Realize in the scheme of GMSK modulation at another kind, FPGA (programmable gate array) module also can be used to realize above-mentioned GMSK modulation.
Continue with reference to figure 2, the method also comprises:
Step S101, the channel of assigned frequency is used to send described GMSK modulation signal, wherein, if described assigned frequency is fixed frequency, the 8PSK channel of assigned frequency is then used to send, if described assigned frequency is the frequency except described fixed frequency, then the GMSK channel of assigned frequency is used to send; Described fixed frequency is the integral multiple of described clock signal.
Structure based on above-mentioned transmitter is known, if select output module according to the setting of modulating mode mode, the GMSK modulation signal exported is selected to launch, so up-conversion, filtering and amplification module are to selecting output module to select the GMSK modulation signal exported carry out GMSK up-conversion, filtering and amplify process, being fed to antenna afterwards and launching.
But, known by testing, the clock signal of transmitter chip internal can carry out the interference (being generally humorous wave interference) of useful signal to part GMSK transmission channel, affect transmission performance, and the frequency of this part GMSK transmission channel is relevant to the frequency of clock signal, the frequency being subject to the GMSK transmission channel of clock signal interference is generally the integral multiple of clock signal frequency.But clock signal is non-uniform to the annoyance level of the GMSK transmission channel of relevant frequency, different according to the noiseproof feature of GMSK modulation module, the degree that is disturbed of the GMSK channel of these subject clock signals impact is also discrepant.
In the application, the GMSK channel of fixed frequency refers to that transmitter chip is thought and is subject to clock signal impact comparatively seriously, to such an extent as to affects communication quality, needs to adopt technical scheme to carry out the GMSK channel adjusted.
Based on the detection of transmission channel, can find to be subject to clock signal serious interference in channel to such an extent as to the frequency affecting communication quality, the set that described fixed frequency is those frequencies detected be set.Frequency in this set is generally the integral multiple of clock signal frequency.
In actual measurement, the channel be disturbed is all the frequency multiplication channel of 13MHz:
Such as, the channel GSMbandChannel994 be disturbed, its frequency is 884MHz (equaling 68 times of 13MHz); The channel DCSbandChannel541 be disturbed, its frequency is 1716MHz (equaling 132 times of 13MHz); The channel DCSbandChannel671 be disturbed, its frequency is 1742MHz (equaling 133 times of 13MHz).
In this application, to the GMSK modulation signal belonged on described fixed frequency frequency, adopt 8PSK transmission channel to carry out data transmission, specifically realize in the following way:
To the GMSK modulation signal belonged on the transmitting frequency of fixed frequency, carry out 8PSK up-conversion, filtering and amplify process, being fed to antenna afterwards and launching;
To the GMSK modulation signal on the GMSK frequency except fixed frequency transmitting frequency, then still carry out GMSK up-conversion, filtering and amplify process, being fed to antenna afterwards and launching.
The another kind provided in the application, based in the communication means of GMSK modulation, except comprising the step shown in Fig. 2, with reference to figure 4, also comprises the steps:
Step S200, carries out 8PSK modulation to obtain 8PSK modulation signal to input signal.
Carrying out 8PSK modulation to the baseband signal of input further can with reference to following steps:
First, input signal divided into groups and be mapped to 8PSK symbol.
This belongs to the sign map (SymbolMapping) defined in gsm protocol, and it is one group that every 3 bits of the sequence by input signal are compiled, and forms combination in 8 by this 3 bit, then is mapped in 8 phase places according to the mapping ruler that agreement defines.Described gsm protocol is agreement GSM05.04V8.0.0.
Then, make 8PSK symbol rotate (SymbolRotation) and through molding filtration (PulseShaping), modulate and obtain described 8PSK modulation signal.
The 8PSK channel of assigned frequency is used to send described second modulation signal.
Continue with reference to figure 4, this communication means also comprises:
Step S201, uses the 8PSK channel of assigned frequency to send described 8PSK modulation signal.
Modulation signal on corresponding all 8PSK frequencies, 8PSK channel is all used to send, namely up-conversion, filtering and amplification module carry out 8PSK up-conversion, filtering and amplification to the 8PSK modulation signal selecting output module to export, and select the 8PSK of corresponding frequency to launch channels transmit 8PSK modulation signal.
The transmitter of corresponding the application, it has step S100 and S101 concurrently.The flow process of step S200 and S201 realizes.
Present invention also provides and a kind ofly can have the transmitter realizing above-mentioned two kinds of communication meanss concurrently, as shown in Figure 5, this transmitter comprises:
GMSK modulation module 30,8PSK modulation module 31, selects output module 32, GMSK/8PSK signal delay module 33, clock generating module 34, synchronous and anti-shaking module 35, up-conversion, filtering and amplification module 36, up-conversion, filtering and amplification module 37, and antenna 38.
In this transmitter, the realization of up-conversion, filtering and amplification module 36 and 37 is different from the transmitter shown in Fig. 1:
In one implementation:
Up-conversion, filtering and amplification module 36 are according to the input of the setting of modulating mode mode and GMSK/8PSK clock signal:
When carrying out GMSK modulation and signal launches, first 8PSK up-conversion, filtering and amplification are carried out to the GMSK modulation signal on the fixed frequency frequency selecting output module 32 to export, and select corresponding 8PSK to launch channel, launch GMSK signal by antenna 38;
When carrying out 8PSK modulation and signal launches, first 8PSK up-conversion, filtering and amplification are carried out to the 8MSK modulation signal on the fixed frequency frequency selecting output module 32 to export, and select corresponding 8PSK to launch channel, launch 8PSK signal by antenna 38.
The input of up-conversion, filtering and amplification module 37 settings according to modulating mode mode and GMSK/8PSK clock signal:
When carrying out GMSK modulation and signal launches, first GMSK up-conversion, filtering and amplification are carried out to the GMSK modulation signal on the on-fixed frequency frequency selecting output module 32 to export, and select corresponding GMSK to launch channel, launch GMSK signal by antenna 38.
When carrying out 8PSK modulation and signal launches, first 8PSK up-conversion, filtering and amplification are carried out to the 8MSK modulation signal on the on-fixed frequency frequency selecting output module 32 to export, and select corresponding 8PSK to launch channel, launch 8PSK signal by antenna 38.
In another kind of implementation:
When carrying out 8PSK modulation and signal launches, one of them module in up-conversion, filtering and amplification module 36 and up-conversion, filtering and amplification module 37 can be selected to realize up-conversion, the filtering to the 8MSK modulation signal selecting output module 32 to export and amplify process, and make the wherein setting of another module based on described modulating mode mode and the input of GMSK/8PSK clock signal, be in wait or resting state when carrying out 8PSK modulation and signal launches.
Present invention also provides another kind of transmitter, as shown in Figure 6, be different from the transmitter shown in Fig. 5, this transmitter also comprises: prefilter 39 and prefilter 310.
Prefilter 39 is located at up-conversion, filtering and amplification module 36 and is selected between output module 32;
Prefilter 310 is located at up-conversion, filtering and amplification module 37 and is selected between output module 32.
A kind of implementation of corresponding above-mentioned up-conversion, filtering and amplification module 36 and 37:
Prefilter 39 makes the GMSK modulation signal on fixed frequency frequency or 8PSK modulation signal pass through, and prefilter 310 makes the GMSK modulation signal on on-fixed frequency frequency or 8PSK modulation signal pass through.
The another kind of implementation of corresponding above-mentioned up-conversion, filtering and amplification module 36 and 37:
Prefilter 39 is according to the input of the setting of modulating mode mode and GMSK/8PSK clock signal: when carrying out GMSK modulation and signal launches, the GMSK modulation signal on fixed frequency frequency is passed through; When carrying out 8PSK modulation and signal launches, then the communication line in this prefilter 310 is made to be open circuit.
Prefilter 310 is according to the input of the setting of modulating mode mode and GMSK/8PSK clock signal: when carrying out GMSK modulation and signal launches, the GMSK modulation signal on on-fixed frequency frequency is passed through; When carrying out 8PSK modulation and signal launches, then the communication line in this prefilter 310 is made to be full range path.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (11)
1., based on a communication means for GMSK modulation, the method accepts the enable control of clock signal, it is characterized in that, comprising:
GMSK modulation is carried out to obtain the first modulation signal to input signal;
The channel of assigned frequency is used to send described first modulation signal, wherein, if described assigned frequency is fixed frequency, then the 8PSK channel of assigned frequency is used to send, if described assigned frequency is the frequency except described fixed frequency, then the GMSK channel of assigned frequency is used to send; Described fixed frequency is the integral multiple of described clock signal.
2. the method for claim 1, is characterized in that, described input signal is baseband signal.
3. the method for claim 1, is characterized in that, describedly carries out GMSK modulation to input signal and comprises to obtain the first modulation signal:
Precoding is carried out to input signal;
Input signal after coding is carried out filtering through Gaussian filter;
MSK modulation is carried out to filtered signal, to obtain described first modulation signal.
4. method as claimed in claim 3, it is characterized in that, described precoding is differential coding.
5. the method for claim 1, is characterized in that, the GMSK channel of specifying with described fixed frequency is by the interference of described clock signal.
6. method as claimed in claim 5, it is characterized in that, described interference is humorous wave interference.
7. the method for claim 1, is characterized in that, the 8PSK channel of described use assigned frequency carries out transmission and comprises:
8PSK upconversion process is carried out to obtain the modulation signal after processing to described first modulation signal;
Modulation signal after using the 8PSK channel of corresponding frequencies to send described process.
8. the method for claim 1, is characterized in that, also comprises:
8PSK modulation is carried out to obtain the second modulation signal to input signal;
The 8PSK channel of assigned frequency is used to send described second modulation signal.
9. method as claimed in claim 8, is characterized in that, describedly carries out 8PSK modulation to input signal and comprises to obtain the second modulation signal:
Input signal is divided into groups and is mapped to 8PSK symbol;
8PSK symbol is rotated and through molding filtration, modulates and obtain described second modulation signal.
10. to the method that the fixed frequency as described in any one of claim 1 to 9 detects, it is characterized in that, comprising:
GMSK modulation is carried out to obtain detecting modulation signal to the detection signal of input;
The GMSK channel of assigned frequency is used to send described detection modulation signal;
If described GMSK channel is interfered, then obtaining frequency corresponding to this GMSK channel is described fixed frequency.
11. methods as claimed in claim 10, it is characterized in that, described interference is humorous wave interference.
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Application publication date: 20160302 Assignee: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Assignor: Xin Xin finance leasing (Beijing) Co.,Ltd. Contract record no.: X2021110000008 Denomination of invention: Communication method based on GMSK modulation and detection method of fixed frequency Granted publication date: 20180605 License type: Exclusive License Record date: 20210317 |
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Effective date of registration: 20221014 Address after: 201203 Shanghai city Zuchongzhi road Pudong New Area Zhangjiang hi tech park, Spreadtrum Center Building 1, Lane 2288 Patentee after: SPREADTRUM COMMUNICATIONS (SHANGHAI) Co.,Ltd. Address before: 101399 Building 8-07, Ronghui Garden 6, Shunyi Airport Economic Core Area, Beijing Patentee before: Xin Xin finance leasing (Beijing) Co.,Ltd. |
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