CN1047275C - Two-way literal mobile communication terminal - Google Patents
Two-way literal mobile communication terminal Download PDFInfo
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- CN1047275C CN1047275C CN95105335A CN95105335A CN1047275C CN 1047275 C CN1047275 C CN 1047275C CN 95105335 A CN95105335 A CN 95105335A CN 95105335 A CN95105335 A CN 95105335A CN 1047275 C CN1047275 C CN 1047275C
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Abstract
The present invention relates to a personal terminal for a bidirectional literal mobile communication system. The terminal can receive and display various kinds of information sent out by a base station and edit information which needs to be sent out by a terminal keyboard, and then the information which needs to be transferred is sent out. The terminal comprises a central processing unit (CPU), an I/O interface circuit, an RAM static memory, an ROM static memory, an EEPROM static memory, a keyboard, a keyboard interface circuit, a display, a data path module for sending a signal, a data path module for receiving the signal, a controller for sending and receiving the signal, a data processing circuit, a power supply circuit, etc., and can be used for various occasions with the need of transferring literal information.
Description
The present invention relates to a kind of mobile communication terminal, relate in particular to and a kind ofly can make the terminal equipment that between the phone-holder of different location, carries out the two-way literal wireless transmission.
Numeral and literal pager system are widely used at present, and this system has at least one base station and a plurality of receiver user independent of each other.But pager system is a unidirectional radio multi-user serial data transmission system, data can only be transmitted by uniaxially in this system, promptly after base station sends paging signal, can't learn whether receiver user has received this paging signal, and receive that the user of paging information also must answer paging information by phone or alternate manner.Therefore, existing pager system can not satisfy the needs that carry out information interchange rapidly.
The appearance of mobile phone has overcome the existing deficiency of pager system, but meanwhile also brings new problem.We know that the frequency of mobile communication (section) is limited as a kind of resource, mobile telephone system transmission be voice signal, and the text communication transmission is digital signal, the transmission speed of digital signal is that the transmission of voice signal is incomparable.Finish the transmission of identical information amount, the literal transmission means is tens million of times of voice transfer mode, and at some in particular cases, written historical materials can be used as tangible foundation.Under the identical condition of the transmission of finishing the identical information amount and the percent of call lost, the literal transmission means is from user capacity, and aspects such as busy channel quantity all are hundreds of times of voice mode, so the literal transmission means can make limited frequency resource be fully utilized.
The purpose of this invention is to provide a kind of terminal that is used for two-way literal mobile communication system, this terminal has overcome the deficiency of above-mentioned pager system and mobile telephone system, be that the personal user not only can be by the various information that this terminal receives and demonstration is sent by base station, and the information that can on its personal terminal needs be sent is with English, Chinese character (comprises phonetic, five, voice, input method such as hand-written), simple graph, secret codes etc. are come out by the keyboard editor, and the information that will need then to transmit is emitted to base station and goes to the personal terminal of any one the desired reception in wireless network or the wired network by base station.
The present invention is achieved in that it is made up of sending and receiving letters circuit and coding-decoding circuit.Collection of letters circuit is successively by collection of letters filtering, field effect transistor high-frequency amplifier, and first frequency mixer is put in first, and second frequency mixer is put in second, phase-locked loop frequency demodulator, and data filter, digital slicer, data sync symbol transformations circuit is formed by connecting.Transmitting circuit is successively by direct frequency synthesizer, the phase-locked loop frequency interleaved modulation modulator, and N level frequency multiplier has power from ring control and accept the self-regulating power amplifier of field intensity, transmitting filter, circulator, antenna are formed by connecting.Coding-decoding circuit is connected with RAM, ROM, EPROM, data port, bus, interface circuit, display, the symbol transformations of holder respectively by the control mouth of central processing unit successively.In addition, power supply connects above-mentioned circuit respectively behind voltage transformation.This terminal power circuit also contains other auxiliary circuits such as power-saving control, alarm control, State Control, instantaneous power.Direct frequency synthesizer in the described transmitting circuit data path module is the phase-locking type synthesizer, comprises automatic power control circuitry that has loop of one's own and the power control circuit that limits radiation field intensity in the power amplifier.High-frequency amplifier in the collection of letters circuit data channel module is a dual gate FET.Two-way literal mobile communication terminal of the present invention possesses following function :-can the total platform of automatic reception or base station transmit the literal or the figure signal of coming, and can produce answer signal automatically.-transmission literal, figure signal produce answer signal automatically.But-interrogate preset modes such as sound, the light of indication, vibration.-have a store function of transmitting-receiving literal or figure.-can link to each other by the RS232 mouth with the personal computer or the network terminal.-personal terminal identification code service options etc. adopt EPROM Reprogrammable (reserving programming).-Gao intelligent menu selects literal to import multiple mode, and every screen can show 40 16 * 16 dot matrix Chinese characters and ideograph more than 15 kinds.-have a high contrast dot matrix graphical display liquid crystal display screen of high-performance back light.-adopting pocsag code, with present Chinese display beep-pager compatibility, and can network with it.-consider to adopt automatic antenna to receive welding system according to given frequency, base station density and base station transmitting power.-miniaturization, be easy to carry (70MM * 120MM * 20MM).-high performance rechargeable battery and common batteries are general, and every charging once can be used more than 200 hours continuously.
Be elaborated below in conjunction with the part of accompanying drawing to two-way literal mobile communication terminal of the present invention (being called for short the personal terminal machine).Accompanying drawing is the structured flowchart of two-way literal communication terminal of the present invention.Terminating machine data flow terminating machine circuit is made up of three parts: sending and receiving letter circuit and coding-decoding circuit, therefore, data flow also is divided into this three part.First: receiving data stream journey
The radio wave that antenna receives enters receiving filter through circulator, and the main effect of receiving filter is to stop to transmit to enter receiving loop, suppresses the interference that transmits receiving loop is caused.Received signal enters high-frequency amplifier through receiving filter, and high-frequency amplifier amplifies the weak radio-frequency signal that antenna receives, and improves the sensitivity of receiving loop, remedies return loss.Radiofrequency signal after the amplification enters first frequency mixer, with the mixing mutually of first local oscillator, obtains first intermediate-freuqncy signal.First intermediate-freuqncy signal filters near the interference signal of intermediate frequency through a narrow band filter, strengthens interference suppression ratio.The filtering output signal enters in first puts, and puts its amplification in first, remedies prime filtering loss.First intermediate-freuqncy signal after filtering is amplified and second local oscillator are exported second intermediate-freuqncy signal in the second frequency mixer mixing, enter in second through narrow-band filtering then and put.Putting in second and be designed to multistage amplification, mainly is to obtain high-gain, and inter-stage is isolated with filter.The output of putting in second enters the frequency discriminator frequency discrimination, and frequency discriminator adopts phase-locked loop frequency demodulator, and its advantage is can regulate because frequency drift and the phase jitter that various interference cause.The frequency discrimination output signal is sent into digital slicer through low pass filter, and digital slicer produces a square wave output, is equivalent to binary coded signal, enters the symbol transformations circuit decoding and goes out Word message.Second portion: data streams journey
The highly stable frequency that crystal oscillator provides enters frequency synthesizer, produces the required various frequencies in terminating machine transmitting-receiving loop.Binary-coded information enters PLL frequency modulator and modulates, and PLL frequency modulator adopts the arrowband direct frequency modulation, has improved the availability of frequency spectrum.Adopting another benefit of PLL frequency modulator is the contradiction that has solved frequency stability and frequency deviation.The FM signal that contains binary-coded information enters frequency multiplier carries out carrier wave and moves, and frequency multiplier makes carrier frequency bring up to radio frequency band on the one hand, can increase the frequency deviation of FM signal on the other hand.Through the radiofrequency signal ingoing power amplifier of frequency translation, power amplifier is amplified to rated power with this radiofrequency signal.Have power from ring control and the self-regulating power amplifier of received field strength, can not only keep power output constant, and can check strap external radiation power, interference reduced to other communication equipment.The radiofrequency signal of amplifying through power amplifier enters emission filter, and the effect of emission filter is the interference that inhibition transmits receiving loop is caused.Last radiofrequency signal is launched by antenna through circulator.Third part: encoding and decoding part-power supply flow process
The working power of receiver and coding-decoding circuit is battery-powered.Battery supply is supplied with radio circuit respectively through voltage transformation, microcomputer, microcomputer clock oscillator circuit, character ROM, internal memory RAM and display driver circuit.The power supply of LCDs is provided by display driver circuit.In addition, this terminal power module also contains power-saving control, other auxiliary circuits such as short of electricity pond microcomputer warning circuit.-decoded data flow process
The system controlled by computer decoded portion is all worked, and it comprises 1 microprocessor, 1 read-only memory (ROM), 1 random-access memory (ram), and input/output bus (I/O circuit).Receiving circuit in program control among the ROM, opens or closes receiver in official hour.By the symbol transformations circuit binary-coded information of receiving is decoded, the text that storage is got in RAM, and produce the call notification sound.In addition, it also discerns keyboard input signal, and excites display screen.-coded data flow process
Cataloged procedure is also by system controlled by computer.Microprocessor extracts Word message according to the character of keyboard input from ROM, deposit Chinese character and fixed phrase character library among the ROM.The Word message of getting shows on display screen on the one hand, deposits conduct backup among the RAM on the other hand in, sends into the symbol transformations circuit simultaneously and carries out binary coding.Binary message behind the coding is sent into transmission circuit and is partly launched.
Referring to accompanying drawing, the personal terminal machine of two-way literal mobile communication system of the present invention is by constituting with the lower part: cpu central processing unit:
Finishing the computing of personal terminal machine inside and external command and the control of peripheral hardware, is the core guarantee that the personal terminal machine is realized various functions.Along with the continuous development single-chip microcomputer of microcomputer technology plays an important role detecting the control field, and the function that the central processing unit of personal terminal machine will be finished reaches and requires single-chip microcomputer very suitable to miniaturization.The personal terminal central processing unit adopts high performance 16 or accurate 32 single-chip microcomputers.16 complete bit manipulation instructions and 32 LDED/STED operational order, and low-power consumption S-TOP order (LPSTOP) addressing range 64M byte above (not containing expansion); Time for each instruction, high speed interrupt response had digital signal processing capability less than 120NS, had the instruction of supporting the HLL high-level language, was convenient to the compiling and the execution of C language.Because single-chip microcomputer is to make module controller, so also adopts the structure of module on the structure.16 bit CPUs, system integration module SIM, tandem queue module QSM, general purpose timer GPT, 8/10 analog to digital converter ADC, high-speed internal bus IMB.
The characteristic of CPU16:
-three 16 indexing applications units.
-two 16 bit accumulators.
The addressability of storage of-1M byte program and 1M byte data memory.
-have towards the control of DSP processing.
-can directly support the HLL high-level language.
-backstage correction module.
-quick interrupt response.
-16 complete bit manipulation instructions.
The characteristic of SIM system integration module:
-external bus interface EBI
-program-controlled choosing output.
-system protection submodule.
-timer clock monitors and bus monitors.
-two 8 difunctional I/O ports.
-two 7 difunctional I/O ports.
-pll clock system.
The characteristic of 8/10 analog to digital converter ADC:
8/10 A/D conversion of-eight passages.
-eight result registers.
-three results adjust submodule.
-one 8 bit data input port.
Tandem queue module QSM:
The serial communication interface of-enhancing.
-Queued Serial Peripheral Interface.
-one 8 difunctional I/O port.
The characteristic of general purpose timer GPT:
-two free-running operations have 16 digit counters of pre-frequency division.
-three input capture passages.
Passage is compared in-four outputs.
Passage is compared in-one input capture/output.
-one pulse accumulation/event count input.
-two pulse width modulated outputs.
-one 8 difunctional I/O port.
-two optionally discrete inputs.
-optionally external clock input.Data processing circuit:
Data processing circuit is the tie that central processing unit is connected with transceiver circuit, is the executor of system's coding and decoding scheme, by sending data processing, receives data processing, the internal clocking conversion, and modules such as system mode supervisory keyboard signal processing are formed.Send data processing (coding):
The transmission data comprise: recipient's address code, address code, frame swynchronization code, bit synchronization sign indicating number, parity check code and the warn sign indicating number etc. of character and picture in ROM, above-mentioned various function codes with a kind of reasonable plan layout, as pocsag code, are reached the purpose of transmitting Word message.Send data processing circuit and coordinate to finish above-mentioned cataloged procedure with CPU, just usually said baseband signal, baseband signal and band efficiency, power utilization, intersymbol interference, signal to noise ratio, transmission rate etc. all have indivisible the contact, to its major requirement are: code efficiency height, error control ability and realization are simple.Receive data processing (decoding):
Receiving data processing is the anti-process that sends data processing, promptly discerns receiving waveform, and to its major requirement be: the decoding error probability is little, simple fast and decoding delay is little.System mode control:
System mode control is the comprehensive module of being finished the various functions of terminating machine by the various control commands that the internal control program is sent, and its control range mainly comprises:
The break-make of-power circuit.
-supply voltage conversion (DC-AC-DC)
-interrogate alarm.
The conversion of-clock frequency.
The generation of-instantaneous power.Keyboard signal is handled:
Reduce the relevant components and parts of keyboard circuit for improving the character code input speed, improve the reliability of circuit, adapt to the operation principle of monolithic interface circuit, adopt 16 to select an analog switch matrix keyboard circuit, its advantage is can arbitrarily expand by bond number does not need encoding and decoding, satisfies the requirement of miniaturization.Inner EEPROM:
Inner EEPROM is the data memory of 512 bytes-1K byte, in order to the appropriate address sign indicating number of this machine of establishment storage, i.e. its ID.Receive data computer-chronograph inside and read this machine special address sign indicating number and the whereabouts of the condition code comparison of receiving with affirmation reception content that signal is transmitted.Read with condition code when sending data and be sent to base station, send to target machine by base station.Keyboard and keyboard interface circuit:
Keyboard is an infrastructure device of finishing the dialogue of people's one machine, form the string matrix form by the expanded data line, the state of each key of CPU timing scan is ordered accordingly by next transmission or is started corresponding subprogram if any button and makes the operator see corresponding demonstration on screen, finishes the editing of literal, image.
Keyboard interface circuit is that the data wire of data processing circuit is expanded to satisfy the requirement of required function number of keys.Owing to use eight to select one and 16 to select an electronic switch, but make required bond number infinite expanding.The I/O interface circuit:
Be CPU and data processing circuit and peripheral hardware connecting function module, be divided into parallel bus and serial bus interface mode with the interface method of external storage, because it is big that the classification that extends out memory required for the present invention reaches capacity more, so adopt the parallel bus interface mode, satisfy the externally read-write requirement of storage of CPU.The I/O interface circuit should have following feature:
-8 BDB Bi-directional Data Bus being connected with single-chip microprocessor MCU or microprocessor MPU.
-two 8 two-way I/O ports are provided.
There are two programmable control registers and data-direction register in-inside.
-four independent control interrupt input lines and two output lines that can do peripheral control.
-I/O reply control logic.
-ternary high resistant can directly drive the triode object-line.
-peripheral interface A can drive CMOS.
-peripheral interface A and B and TTL compatible.
-chip static state operation mode.
-have interruption controls and a screening ability.The RAM dynamic memor:
The storage of dynamic data such as literal, graphics edition; Interrogate literal video data etc.ROM static storage (read-only memory):
Having Chinese character, fixed phrase and graphic dot matrix data in this memory arrays is character library, also is the fixed routine memory of finishing various instructions and mode of operation.The EPROM static storage:
The EPROM static storage is that revisable memory under programs such as pass point are programmed, are provided with to this machine service item option of storage.Display:
Adopt high performance automatic reserve light liquid crystal display device (LCD), this device has characteristics such as low-work voltage, low-power consumption, long-life, can show 16 * 16 dot matrix Chinese characters, extraordinary ideographic symbol etc.Sending the data path module comprises :-antenna: the key property of antenna:
All couplings till antenna system comprises from the antenna to the transmission line junction, balance, phase shift or other coupling device, be to be transformed into the electromagnetic wave in space or conversely the space electromagnetic wave to be transformed into signal power in the transmission line for the high frequency conduction current of effectively transmission line being sent here, because personal terminal is a kind of portable mobile apparatus, be used as the invertibity of carrying out power conversion when transmitting and receiving according to antenna, their parameter remains unchanged when transmitting-receiving, so the parameter of antenna is general when transmitting-receiving.
The personal terminal machine is owing to be subjected to the restriction of mounting condition, and the performance of antenna is subjected to the influence of environment easily, but antenna is again the important step of whole system link, and communication quality is had a direct impact, and therefore antenna is had specific (special) requirements.At first, because terminating machine often is in mobile status, the position is fixing, so antenna presenting direction not on horizontal plane, no matter how to change with the relative position of base station like this, and receiving and transmitting signal stably; Secondly owing to must accomplish to receive and dispatch when working with the double frequency duplex mode, the protection frequency band is arranged between transmitting-receiving frequency by dual-purpose, antenna must have enough wide working band, just can take into account the signal frequency of transmitting-receiving.-circulator and transceiver filter:
Personal terminal adopts duplex mode, transmitting-receiving is worked simultaneously must have duplexer that transmitting-receiving is independent of each other, the radio-frequency power that sender produces has two aspects to the influence of receiver: the one, and the strong signal of transmission frequency makes the receiver prime produce obstruction, eliminating this influence must make this machine that enters the receiver prime transmit to be suppressed to below the blocking level, the 2nd, the frequency spectrum of posting a letter can directly enter the therefore accuracy of influence reception Word message of receiver with the noise in the collection of letters passband, so must suppress this part noise at the output of posting a letter, make it be lower than the noise equivalent power of this comfortable antenna input of receiver.Before a kind of elimination of influence, rely on receiver inlet and insert collection of letters filter, enter transmitting filter with the prevention power of posting a letter, cause noise power on collection of letters frequency band with the frequency spectrum that suppresses to post a letter.Isolate transceiving filter with circulator, can improve the isolation between the sending and receiving letter.One frequency synthesizer:
Duplexing NBM, NBFM movetext communication system of the present invention carries out communication because of the several different frequencies of needs, and frequency interval is 25kHz, this just requires the frequency of communication apparatus to originate should be variable, also to aspire for stability simultaneously, so just required people's crystal oscillator, it can provide a stabilized frequency, but frequency is one, if will provide different frequency, must manage to carry out conversion, adopt frequency synthesis technique be exactly by frequency add, subtract, the computing of multiplication and division, one or several standard frequency is become the technology of a plurality of required frequencies.
The method of frequency synthesis is a lot, the present invention adopts indirect synthesis technique, indirect synthesis technique is to produce a large amount of harmonic wave or combination frequency with one or several reference frequency source by harmonic oscillator, mixing and frequency division etc., use phase-locked loop then, the frequency lock of voltage controlled oscillator on a certain harmonic wave or combination frequency, is produced needed frequency output indirectly by VCO.The indirect type synthesizer is called phase-locking type cohabit cohabitation device again, its major advantage is: because phase-locked loop is equivalent to narrow-band tracking wave-wave device, it has the tracking characteristics of fine arrowband, therefore can well select required frequency, while good restraining parasitic component, avoid a large amount of use filters, very helped desired integrated and miniaturization.The phase-locked loop here is a variable number frequency division ring, is characterized in adopting in loop variable number frequency divider, digital phase discriminator.-frequency interleaved modulation modulator:
The process that useful signal is loaded on the high frequency claims modulation.In two-way literal communication terminal of the present invention, in order to enlarge message capacity, improve frequency efficiency, the present invention adopts the narrow-band FM modulation system, utilize the direct frequency modulation method, to be subjected to the oscillation circuit of variable reactive element (variable capacitance diode) access carrier of modulation signal control, directly change carrier frequency and realize linear frequency modulation, the popularization of integrated phase lock makes this direct frequency modulation mode solve the contradiction of frequency stability and frequency deviation preferably.-frequency multiplier:
The purpose of using frequency multiplier is not still in order to improve carrier frequency, and be in order to increase the frequency deviation of FM signal, especially when the frequency of frequency synthesizer because condition restriction can not be very high the time, often need frequency multiplication several times, frequency multiplier must have enough levels of drive, in order to select required harmonic wave at the frequency multiplier output, the frequency multiplier load circuit needs good selectivity, and suppresses the various spuious component that frequency multiplication causes with a narrow band filter before promoting power amplifier.-power amplifier:
The effect of power amplifier is that the radiofrequency signal that frequency multiplier produces is amplified to rated power.The present invention adopts thick film mixing integrated amplifier as power amplifying device, is characterized in: active and passive device is combined into integral body, and volume is little, the reliability height, and working band is wide, and external element is few, can not need adjust element.This has brought convenience for the complete machine factory test.Thick film mixing integrated amplifier piece should have the circuit of two kinds of power controlling, and a kind of is the automatic power control circuitry that has loop of one's own, and it can keep power output constant, can protect the power amplifier piece again.Another kind of power control is in order to limit radiation field intensity, to reduce communication system and interfere with each other, and at this moment the signal strength signal intensity that receives according to oneself of the power output of power amplifier piece is controlled.When communication object was nearer, received signal was stronger, and the power output of power amplifier just reduces automatically.So both kept the literal transmission quality, saved electric energy, and can not cause interference again other communication apparatus.Collection of letters data path module comprises :-high-frequency amplifier:
The effect of high-frequency amplifier is to amplify the weak radio-frequency signal that antenna receives, and to improve the sensitivity of receiving apparatus, reduces the noise of back level (particularly mixer stage), improves the selectivity in loop, remedies return loss.The present invention adopts dual gate FET, dual gate FET do high-frequency amplifier can make the input impedance height, highly sensitive, noise factor is low, output impedance is high, has improved the performance of receiver, the trend of work scope of dual gate FET is big, can allow bigger input signal, the antiblocking ability is strong.-the first frequency mixer:
The effect of first frequency mixer is the radiofrequency signal and the first local oscillation signal mixing that high-frequency amplifier circuit is sent here, obtains the lower intermediate-freuqncy signal of frequency.First frequency mixer is bigger to the sensitivity and the influence of non-linear index of receiver, should select device and circuit preferably for use.The device that mixer stage of the present invention is selected for use is a gate field-effect transistor.Put in-the first, put in second mixing, second, frequency discrimination, filtering, amplitude limiter circuit module:
Putting in first is to remedy the loss of first frequency mixer behind filter, and intermediate-freuqncy signal is further amplified.Put in second and frequency discrimination has used phase-locked loop frequency demodulator.Pll demodulation circuit utilizes the FM signal of voltage controlled oscillator generation and the phase difference between the input signal to detect modulation signal, and error signal is fed back to voltage controlled oscillator.The instantaneous frequency of voltage controlled oscillator is followed the tracks of the variation of frequency input signal during loop-locking, so the control signal of voltage controlled oscillator is consistent with the variation of frequency input signal.Phase-locked link demodulation has many good qualities.Select different pll parameters, can adapt to various requirement.The transceiver controller;
The transceiver controller is for finishing the control device that the conversion between each functional part is provided with between the transmitting-receiving, and all control signals that it sends are sent control command by central processing unit.This terminal electric property and method of measurement are as follows :-transmitting end electric property and method of measurement :-carrier wave rated power:
Carrier wave rated power is meant that sender under the condition of not flirting, is delivered to the average power on the standard output load, and instantaneous power surpassed the maximum permissible value of radio authorities when two-way literal mobile communication terminal of the present invention was launched.
Concrete method of measurement is to adopt power meter to measure.With input impedance 50 Ω, frequency range is that the power meter gage outfit of 28MHz is received the sender radio-frequency (RF) output end, starts radiating circuit, measured performance number be nominal value+1.0dB--scope of 0.5dB in.-carrier frequency frequency tolerance:
Sender carrier frequency frequency tolerance is meant that actual measurement do not transfer the poor of carrier frequency and nominal value.
The method of measurement of carrier frequency frequency tolerance is that sender is connected with gauge load, and the coupling unit energy is to frequency meter, measuring frequency under frequency meter incoming level normal condition.Sender is worked under unmodulated situation, measures respectively under normal condition limes superiors condition.The value of frequency tolerance should not surpass ± 0.016Hz when being spaced apart 25KHz in the frequency range of the 280MHz left and right sides.-frequency modulation and restriction thereof:
Frequency modulation is meant the instantaneous frequency of modulated RF signals and the difference of carrier frequency, comprises following content:
Modulation sensitivity:
Modulation sensitivity is meant that the magnitude of voltage rated frequency deviation when its initial data sign indicating number is 1KHz was 60% of a maximum permissible frequency deviation when sender radio-frequency (RF) output end obtained rated frequency deviation.Use the modulation degree instrument to measure frequency deviation, sender is exported with rated power, and the magnitude of voltage that reads 1KHz with the low-frequency voltage table is a modulation sensitivity.
Maximum permissible frequency deviation:
Maximum permissible frequency deviation is according to the modulated signal instantaneous frequency of channel spacing regulation and the maximum permissible value of nominal carrier frequency.When channel spacing was 25KHz, maximum permissible frequency deviation was ± 5KHz, by the high 20dB of input sensitivity value; And the change frequency modulating signal changes the maximum frequency deviation value of being read between 300-3KHz.
Klirrfactor:
Add standardized digital signal at data input pin, the secondary that records through demodulation at transmitting terminal and more total effective value of high order harmonic component composition be klirrfactor to the ratio of the effective value of whole signal.Should not be higher than 10%, the main probability of considering to produce error code.
The neighboring trace radiant power:
The neighboring trace radiant power is that sender falls into the part in the adjacent channel reception bandwidth in specified modulation condition gross output.The neighboring trace radiant power is the summation of the average power that produced such as frequency modulation video stretching and noise.
Three kinds of method of measurement are arranged, and they are respectively: adjacent-channel power meter mensuration; Channel analyzer mensuration; The test receiver mensuration, the specification requirement adjacent-channel power should be than more than the low 70dB of carrier power.-post a letter (carrier wave) start-up time:
Post a letter and be meant the time required when sender control produces carrier power output start-up time.Rising to the peaked 50% o'clock required time interval with linear peak detector measurement carrier wave track should be less than 100ms.-receiving terminal electric property and method of measurement :-noise factor and sensitivity:
Noise factor and sensitivity are to weigh the two kind method for expressing of receiver to the small-signal receiving ability.For receiver noise factor and sensitivity is the important indicator of weighing its quality good or not.
Noise factor is meant the ratio of noise power that the receiver output records and the thermal noise power that the signal source internal resistance is produced as noise source unique in the system and at output, represents with dB.
When sensitivity is meant and modulates with standardized digital signal, the signal to noise ratio that obtains stipulating at the receiver output, and power output is not less than under 50% situation of standardized digital signal rated power, and the needed minimum signal level of receiver inlet is represented with μ V or dB μ V.
Method of measurement has three kinds: the signal to noise ratio horology; Signal-to-Noise-and-distortion ratio mensuration and inhibition sensitivity measure method.The maximum index of sensitivity should surpass+6dB μ V.-large-signal signal to noise ratio:
The large-signal signal to noise ratio is meant when radio-frequency input signals is enough strong, the snr value that records at receiver serial data output.-amplitude limiting characteristic:
The amplitude limiting characteristic of receiver is meant when the input radio frequency level changes in a prescribed limit, the fixed ampllitude performance of output serial data level.-modulation receives bandwidth:
The modulation of receiver receives bandwidth and is meant that receiver receives an incoming level than the highly sensitive+6dB of actual measurement and the twice of the input signal frequency modulation when making the Signal-to-Noise-and-distortion ratio of output signal roll back 12dB.
Measure modulation when receiving bandwidth, utilized the method that increases frequency deviation and make the frequency modulation video stretching, but because intermediate-frequency bandwidth is certain, thereby along with the increase of frequency deviation, distortion also increases, thereby Signal-to-Noise-and-distortion ratio is reduced.
Dynamic bandwidth when modulation receives bandwidth and directly reflected operation of receiver, it is not only relevant with the bandwidth of intermediate-frequency filter, and accurately relevant with demodulation distortion, local frequency and intermediate-frequency filter centre frequency, thereby Practical significance is more arranged.-anti-Intermodulation Interference performance:
Anti-Intermodulation Interference performance is meant that the receiver pair and the frequency of useful signal have the inhibition ability of two or more unwanted signals of particular kind of relationship, and it is represented with the relative level (dB) of interference signal and sensitivity.When the level ratio sensitivity of input useful signal during, cause that the existence of this unwanted signal of intermodulation makes the output Signal-to-Noise-and-distortion ratio of receiver roll back 12dB in 3dB.At this moment the Intermodulation Interference level and the dB number of useful signal level ratio are restrain of Intermodulation Interference ability when receiving.-co-channel inhibition:
The co-channel inhibition of receiver is meant that receiver resists co-channel interference capability, it is represented with poor (dB) of interference signal and useful signal level, when importing the highly sensitive 3dB of level ratio of useful signal, the existence of this interference signal makes the output Signal-to-Noise-and-distortion ratio of receiver roll back 12dB, and the dB of the useful signal level of this moment and the difference of interference signal level is anti-co-channel interference index.-receiver start-up time:
Receiver be meant start-up time produce the serial digital signal required time of power output behind the input modulated RF signals should be less than 150ms.
Claims (2)
1, a kind of two-way literal mobile communication terminal is characterized in that: it comprises sending and receiving letter circuit, also comprises coding-decoding circuit; Collection of letters circuit is successively by collection of letters filter, high-frequency amplifier, and first frequency mixer is put in first, and second frequency mixer is put in second, phase-locked loop frequency demodulator, data filter, digital slicer, data sync symbol transformations circuit is formed by connecting; Transmitting circuit is successively by direct frequency synthesizer, the phase-locked loop frequency interleaved modulation modulator, N level frequency multiplier, have power and control and accept the self-regulating power amplifier of field intensity from ring, transmitting filter, circulator, antenna are formed by connecting, and coding-decoding circuit is connected with RAM, ROM, EPROM, data port, bus, interface circuit, display, the symbol transformations of holder respectively by the control mouth of central processing unit successively, and power supply connects above-mentioned each circuit respectively through behind the voltage transformation in addition; This terminal power circuit also contains power-saving control, alarm control, State Control, other auxiliary circuit of instantaneous power.
2, terminal as claimed in claim 1 is characterized in that: the frequency synthesizer of described transmitting circuit is the phase-locking type synthesizer; Include automatic power control circuitry that has loop of one's own and the power control circuit that limits radiation field intensity in the power amplifier; High-frequency amplifier in the collection of letters circuit is a dual gate FET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95105335A CN1047275C (en) | 1995-05-08 | 1995-05-08 | Two-way literal mobile communication terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95105335A CN1047275C (en) | 1995-05-08 | 1995-05-08 | Two-way literal mobile communication terminal |
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| CN1128471A CN1128471A (en) | 1996-08-07 |
| CN1047275C true CN1047275C (en) | 1999-12-08 |
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| CN95105335A Expired - Fee Related CN1047275C (en) | 1995-05-08 | 1995-05-08 | Two-way literal mobile communication terminal |
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| CN (1) | CN1047275C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7116784B2 (en) * | 2002-09-30 | 2006-10-03 | Motorola, Inc. | Method and apparatus for authenticated reporting in a mobile communication device |
| US20080266129A1 (en) * | 2007-04-24 | 2008-10-30 | Kuo Ching Chiang | Advanced computing device with hybrid memory and eye control module |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0544456A2 (en) * | 1991-11-27 | 1993-06-02 | AT&T Corp. | Paging arrangements in a cellular mobile switching system |
| CN1095881A (en) * | 1992-11-27 | 1994-11-30 | 莫托罗拉公司 | Have the wide area paging of combination and the signalling system of high data rate transfer |
-
1995
- 1995-05-08 CN CN95105335A patent/CN1047275C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0544456A2 (en) * | 1991-11-27 | 1993-06-02 | AT&T Corp. | Paging arrangements in a cellular mobile switching system |
| CN1095881A (en) * | 1992-11-27 | 1994-11-30 | 莫托罗拉公司 | Have the wide area paging of combination and the signalling system of high data rate transfer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1128471A (en) | 1996-08-07 |
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