CN1047275C - Two-way characters mobile communication terminal - Google Patents

Two-way characters mobile communication terminal Download PDF

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CN1047275C
CN1047275C CN 95105335 CN95105335A CN1047275C CN 1047275 C CN1047275 C CN 1047275C CN 95105335 CN95105335 CN 95105335 CN 95105335 A CN95105335 A CN 95105335A CN 1047275 C CN1047275 C CN 1047275C
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circuit
frequency
power
signal
terminal
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CN 95105335
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CN1128471A (en
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王水兵
杨文胜
苏彦兵
庄大川
徐峰
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北京三足通讯技术公司
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Abstract

一种双向文字移动通信终端由收、发信电路和编解码电路组成的,收信电路依次由收信滤波器、高频放大器,第一混频器,第一中放,第二混频器,第二中放,鉴频器,数据滤波器,数字限幅器,数据同步码元变换电路连接而成,发信电路依次由频率合成器,调频调制器,N级倍频器,带有功率自环控制及接受场强自动调节的功率放大器,发信滤波器,环行器、天线连接而成,编解码电路依次由中央处理器的控制口分别与储存器的RAM、ROM、EPROM、数据口、总线、接口电路、显示器、码元变换连接,该终端不仅可接收、显示由基台所发的各种信息,还可将需发出的信息由终端键盘编辑,然后将该需传递信息发出去,该终端可用于多种需要进行文字传递的场合。 A two-way text received by the mobile communication terminal, a transmission circuit and a codec circuit, the receiving circuit in sequence, the high frequency amplifier, a first mixer, a first intermediate level by the receiving filter, a second mixer , a second intermediate level, frequency, filters the data, digital slicer, a data synchronization circuit connected to each transformed symbol, the transmission circuit in turn by the frequency synthesizer, FM modulator, N-stage frequency multiplier, with since the power control loop and the receiving field intensity automatically adjust the power amplifier, the transmission filter, the circulator, connected to each antenna, codec circuit in turn by a central processor control port, respectively reservoir RAM, ROM, EPROM, data mouth, bus interface circuit, a display, a symbol conversion connector, the terminal can not receive display information from the various information issued by the base station, may also be required issued by the terminal keyboard to edit, then the need to transfer information sent the terminal can be used in a variety of applications requiring transfer of text.

Description

双向文字移动通信终端 The mobile communication terminal two-way text

本发明涉及一种移动通信终端,尤其涉及一种能使位于不同地点的持机人之间进行双向文字无线传输的终端设备。 The present invention relates to a mobile communication terminal, and particularly to a way for the terminal device at different locations between the person holding machine bidirectional wireless transmission of text.

目前数字和文字寻呼机系统已经得到广泛的应用,该系统具有至少一个基台和多个彼此独立的用户接收机。 Currently alphanumeric pager system has been widely used, the system having at least a base station and a plurality of mutually independent user receiver. 但寻呼机系统是一个单向的无线多用户串行数据传输系统,该系统只能单向地传输数据,即当基台发出寻呼信号后,无法得知用户接收机是否收到了该寻呼信号,而且收到寻呼信息的用户还必须通过电话或者其它方式来答复寻呼信息。 However, a multi-user system is a wireless pager serial data transmission system of one-way, the system is only one-way transmission of data, i.e., when the base station sent the paging signal, the user can not know whether the receiver of the paging signal and the user must receive paging information to answer the paging information by phone or other means. 因此,现有的寻呼机系统已不能满足迅速进行信息交流的需要。 Therefore, the conventional pager system can not meet the need for rapid information exchange.

移动电话的出现克服了寻呼机系统所存在的不足,但与此同时也带来新的问题。 The emergence of mobile phone pager system overcomes the shortcomings that exist, but at the same time it also brings new problems. 我们知道,移动通讯的频点(段)作为一种资源是有限的,移动电话系统传输的是语音信号,而文字通信传输的是数字信号,数字信号的传输速度是语音信号的传输所无法比拟的。 We know that the frequency mobile communications (segment) as a resource is limited, mobile telephone transmission system is a voice signal, and text communications transmitted digital signal, digital signal transmission speed is the transmission of voice signals can not be compared of. 完成相同信息量的传递,文字传输方式是语音传输方式的数千万倍,而且在某些特殊情况下,文字资料可作为有形的依据。 The completion of the transfer the same amount of information, text transmission is several million times the transmission of voice, and in some special cases, the text data can be used as a tangible basis. 在完成相同信息量的传递、且呼损率相同的条件下,文字传输方式从用户容量,占用信道数量等方面都是语音方式的数百倍,所以文字传输方式可以使有限的频率资源得到充分的利用。 At the same amount of information transfer is completed, and the same call loss rate, from the user text transmission capacity, the number of occupied channels and other aspects are hundreds of times the voice mode, the text transmission limited frequency resources can be fully It uses.

本发明的目的是提供一种用于双向文字移动通信系统的终端,该终端克服了上述寻呼机系统和移动电话系统的不足,即个人用户不仅可以通过该终端接收和显示由基台发出的各种信息,而且可以在其个人终端上将需要发出的信息用英文、汉字(包括拼音、五笔、语音、手写等输入方法)、简单图形、保密代码等由键盘编辑出来,然后将该需要传递的信息发射至基台并通过基台转至无线网或有线网中的任何一个所期望接收的个人终端。 Object of the present invention is to provide a two-way text terminal for a mobile communication system, which overcomes the deficiencies described above pager terminal system and a mobile telephone system, i.e., individual users can only receive and display various issued by the terminal through the base information, and the information may be necessary to issue the personal terminal on which English, Chinese characters (including Pinyin input method, five, speech, handwriting, etc.), simple graphics, and other confidential codes edited out by the keyboard, then the need to pass information transmitting to the base station and a radio network or go to any of the cable network desired by the terminal received from the personal base.

本发明是这样实现的:它是由收、发信电路和编解码电路组成的。 The present invention is implemented: it is received, the transmission circuit and a codec circuit thereof. 收信电路依次由收信滤波、场效应管高频放大器,第一混频器,第一中放,第二混频器,第二中放,锁相环鉴频器,数据滤波器,数字限幅器,数据同步码元变换电路连接而成。 Sequentially receiving circuit receiving a filtered, high frequency FET amplifier, a first mixer, a first intermediate level, a second mixer, a second intermediate level, phase locked loop frequency discriminator, the data filter, a digital slicer, a data synchronization circuit connected to each transformed symbol. 发信电路依次由直接式频率合成器,锁相环调频调制器,N级倍频器,带有功率自环控制及接受场强自动调节的功率放大器,发信滤波器,环行器、天线连接而成。 Sequentially transmitting circuit by the direct frequency synthesizers, phase lock loop FM modulator, N multiplier stages, with the control loop and receiving power from the field of automatic adjustment of the power amplifier, the transmission filter, the circulator, the antenna connection made. 编解码电路依次由中央处理器的控制口分别与储存器的RAM、ROM、EPROM、数据口、总线、接口电路、显示器、码元变换连接。 Codec circuit sequentially ROM, EPROM, data port, a bus, an interface circuit, a display, connected to each transformed symbol to the reservoir of RAM, the central processor control port. 另外,电源经电压变换后分别接上述电路。 Further, after the power-voltage conversion respectively connected through the circuit. 本终端电源电路还含有省电控制、告警控制、状态控制、瞬时功率等其它辅助电路。 This power supply circuit further comprises a terminal power saving control, alarm control, state control, the instantaneous power and other auxiliary circuit. 所述发信电路数据通路模块中的直接式频率合成器为锁相式合成器,功率放大器中包含自成环路的自动功率控制电路和限制辐射场强的功率控制电路。 A data path circuit module directly to the transmission frequency synthesizer is a phase-locked synthesizer, comprising from the power amplifier into the loop automatic power control circuit and the radiation field limits the power control circuit. 收信电路数据通路模块中的高频放大器为双栅场效应管。 Receiving a data path circuit module is a high frequency amplifier dual-gate FET. 本发明的双向文字移动通信终端具备如下功能:-能够自动接收总台或基台转发来的文字或图形信号,并且能够自动产生应答信号。 Text bidirectional mobile communication terminal according to the present invention includes the following functions: - receiving automatically total base station or forwarded text or graphic signal, and can automatically generate a response signal. -发送文字、图形信号自动产生应答信号。 - send a text, a graphic signal is automatically generated response signal. -来讯指示有声、光、振动等可预置方式。 - to indicate hearing sound, light, vibration or the like can be preset mode. -具有收发文字或图形的存贮功能。 - a transceiver having a storage function of the text or graphics. -能与个人微机或网络终端通过RS232口相连。 - it can be connected to the RS232 port via a personal computer or a network terminal. -个人终端识别码服务选项等采用EPROM可重新编程(预留编程)。 - PIN personal terminal optional services using a reprogrammable EPROM (reserved program). -高智能菜单选择文字输入多种方式,每屏可显示40个16×16点阵汉字及15种以上表意文字。 - intelligent text input menu to select a variety of ways, each screen can display 16 × 16 dot matrix 40, and 15 or more kinds of ideographic characters. -具有高性能后照光的高反差点阵式图形显示液晶屏。 - high contrast dot-matrix pattern of the illuminated LCD display having a high performance. -采用POCSAG码,与目前汉显寻呼机兼容,并可与之联网。 - using POCSAG code compatible with the current Chinese display pager, and with networking. -根据给定频点、基台密度与基台发射功率考虑采用自动天线收接系统。 - according to the given frequency, the base station and the base station transmit power density considering close contact automatic antenna system. -小型化,便于携带(70MM×120MM×20MM)。 - compact, portable (70MM × 120MM × 20MM). -高性能可充电电池与普通电池通用,每充电一次可连续使用200小时以上。 - high-performance rechargeable battery with a normal battery general, each charging time can be used continuously for 200 hours.

下面结合附图对本发明的双向文字移动通信终端(简称个人终端机)的组成部分进行详细说明。 The following detailed description in conjunction with the accompanying drawings part of a two-way mobile communication terminal according to the present invention, the text (abbreviated personal terminal) is. 附图是本发明的双向文字通信终端的结构框图。 BRIEF is a block diagram of a two-way text communications terminal according to the present invention. 终端机数据流程终端机电路由三部分组成:收、发信电路和编解码电路,因此,数据流程也分为这三部分。 Terminal terminal data flow circuit consists of three parts: receiving, transmitting circuit and a codec circuit, therefore, the data flow is also divided into three parts. 第一部分:接收数据流程天线接收的无线电波经环行器进入接收滤波器,接收滤波器的主要作用是阻止发射信号进入接收回路,抑制发射信号对接收回路造成的干扰。 First part: receiving the flow of data through a radio wave received by the antenna circulator enters a reception filter, the reception filter main role is to prevent the transmitted signal into the receiver circuit, the transmission signal to suppress the interference caused by the reception circuit. 接收信号经接收滤波器进入高频放大器,高频放大器将天线接收到的微弱射频信号放大,提高接收回路的灵敏度,弥补回路损耗。 Received signal into the reception filter high frequency amplifier, high frequency amplifier to the antenna for receiving the weak RF signal amplified, to improve the sensitivity of the receiver circuit, to compensate for return loss. 放大后的射频信号进入第一混频器,与第一本振相混频,得到第一中频信号。 Amplified RF signal into the first mixer, the first LO phase mixer, to obtain a first intermediate frequency signal. 第一中频信号经过一个窄带滤波器,滤掉中频附近的干扰信号,加强干扰抑制比。 A first intermediate frequency signal through a narrowband filter, IF filter out interfering signals nearby, reinforcing interference suppression ratio. 滤波输出信号进入第一中放,第一中放将其放大,弥补前级滤波损耗。 In the filtered output signal enters the first place, in the first place it is amplified, pre-filter to compensate for losses. 滤波放大后的第一中频信号与第二本振在第二混频器混频,输出第二中频信号,然后经窄带滤波进入第二中放。 A first intermediate frequency signal is filtered and amplified second local mixing in a second mixer, the output of the second IF signal, and then put into the second through the narrowband filtered. 第二中放设计为多级放大,主要是获得高增益,级间用滤波器隔离。 A second intermediate level is designed to multi-stage amplification, mainly high gain, isolation between filter stages. 第二中放的输出进入鉴频器鉴频,鉴频器采用锁相环鉴频器,其优点是可以调节由于各种干扰引起的频率漂移和相位抖动。 Put into the output of the second frequency discriminator phase frequency discriminator phase locked loop frequency discriminator, the advantage may be adjusted due to the frequency drift and phase jitter caused by various disturbances. 鉴频输出信号经低通滤波器送入数字限幅器,数字限幅器产生一个方波输出,相当于二进制编码信号,进入码元变换电路解码出文字信息。 Discriminator output signal into the digital low-pass filter slicer, a digital slicer generates a square wave output corresponding to the binary coded signal into a decoded symbol character information converting circuit. 第二部分:发射数据流程晶体振荡器提供的高稳定度频率进入频率合成器,产生终端机收发回路所需的各种频率。 Second part: high stability crystal oscillator frequency of the transmitted data flow supplied into the frequency synthesizer, to generate the various frequencies required for the terminal transceiver circuit. 二进制编码信息进入锁相环调频器进行调制,锁相环调频器采用窄带直接调频,提高了频谱利用率。 Binary coded information into the PLL tuner is modulated, narrow-band PLL frequency modulator direct frequency modulation to improve the spectrum efficiency. 采用锁相环调频器的另一好处是解决了频率稳定度与频偏的矛盾。 Another advantage of using phase-locked loop frequency modulator is to solve the contradiction between frequency stability and frequency offset. 含有二进制编码信息的调频信号进入倍频器进行载波搬移,倍频器一方面使载波频率提高到射频频段,另一方面可以增加调频信号的频偏。 FM signal containing binary coded information into the multiplier performs a carrier shift, the frequency multiplier on the one hand to improve the RF carrier frequency band, on the other hand can increase the frequency deviation of the FM signal. 经过频率搬移的射频信号进入功率放大器,功率放大器将此射频信号放大到额定功率。 After the frequency translation of the RF signal into the power amplifier, the power amplifier amplifies the RF signal to this nominal power. 带有功率自环控制及接收场强自动调节的功率放大器,不仅能保持输出功率恒定,而且可以限制带外辐射功率,减少对其它通信设备的干扰。 Since the power control loop with the reception field strength and the automatic adjustment of the power amplifier, not only to maintain constant output power, and can limit the band radiation power, reducing interference to other communications devices. 经功率放大器放大的射频信号进入发射滤波器,发射滤波器的作用是抑制发射信号对接收回路造成的干扰。 By the power amplifier amplifies radio frequency signals into the transmitting filter, the transmission filter effect is to suppress the interference caused by the transmitted signal to the receiving circuit. 最后射频信号经环行器由天线发射出去。 Finally, the RF signal emitted by the circulator antenna. 第三部分:编解码部分-电源流程接收机和编解码电路的工作电源由电池供电。 Part III: codec section - the power receiver and the codec process operating power supply circuit powered by a battery. 电池电源经电压变换分别供给射频电路,微计算机,微机时钟振荡器电路,字符ROM,内存RAM以及显示驱动电路。 Battery power are supplied via the voltage converting radio frequency circuit, a microcomputer, the microcomputer clock oscillator circuit, a character ROM, RAM memory and a display driver circuit. 液晶显示屏的电源由显示驱动电路提供。 Power is provided by the LCD display driving circuit. 另外,本终端电源模块还含有省电控制,缺电池微机告警电路等其它辅助电路。 Further, this power supply module further comprises a terminal power control, lack of other auxiliary microcomputer alarm circuit of the battery circuit. -解码数据流程微机控制解码部分全部工作,它包含1个微处理器,1个只读存储器(ROM),1个随机存取存储器(RAM),以及输入/输出总线(I/O电路)。 - decoding part decoding data flow computer control all the work, which contains a microprocessor, a read only memory (a ROM), a random access memory (RAM), and input / output bus (I / O circuit). ROM中的程序控制着接收电路,在规定的时间内开或关接收机。 ROM is a control circuit of the receiver, the receiver on or off within a predetermined period of time. 通过码元变换电路对收到的二进制编码信息进行解码,在RAM中存储取到的电文,并产生呼叫通知音。 Decoding binary coded information symbols received by a converting circuit, stored in the RAM to get the message, and generates a call notification sound. 另外,它也识别键盘输入信号,并激发显示屏幕。 In addition, it also identifies key input signal, and excites the display screen. -编码数据流程编码过程也由微机控制。 - flow of the encoding process the encoded data is also controlled by the microcomputer. 微处理器根据键盘输入的字符,从ROM中提取文字信息,ROM中存放汉字及固定短语字库。 The microprocessor keyboard input characters, the character information extracted from the ROM, the ROM storing characters and the fixed phrase character. 取到的文字信息一方面在显示屏幕上显示,另一方面存入RAM中作为备份,同时送入码元变换电路进行二进制编码。 To take on the aspect of character information display screen, on the other hand are stored in RAM as a backup, while feeding symbols into binary coding circuit. 编码后的二进制信息送入收发电路部分发射出去。 Binary coded information into the transceiver circuit section is emitted.

参见附图,本发明的双向文字移动通信系统的个人终端机由以下部分构成:CPU中央处理器:完成个人终端机内部及外部指令的运算及外设的控制,是个人终端机实现各种功能的核心保障。 Referring to the drawings, a personal two-way mobile communication system according to the text of the present invention is constituted by the terminal portion: the CPU CPU: completion of the internal operation and control of individual terminals and peripherals external command, the individual terminals to implement various functions the core protection. 随着微机技术的不断发展单片机在检测控制领域发挥着重要的作用,而个人终端机的中央处理器所要完成的功能及对小型化的要求单片机又非常适合。 With the development of single-chip computer technology plays an important role in the detection and control, and individual terminals of the central processor to complete the functionality and miniaturization requirements of the microcontroller and very fit. 个人终端中央处理器采用高性能的16位或准32位单片机。 The central processor of the personal terminal 16 of the high-performance 32-bit microcontroller or quasi. 完整的16位操作指令和32位的LDED/STED操作指令,以及低功耗S-TOP命令(LPSTOP)寻址范围64M字节以上(不含扩展);指令执行时间小于120NS,高速中断响应,具有数字信号处理能力,具有支持HLL高级语言的指令,便于C语言的编译与执行。 Full 16-bit instructions and 32-bit LDED / STED operation instruction, and low power consumption command S-TOP (LPSTOP) addressing range than 64M bytes (excluding extension); instruction execution time is less than 120ns, a high-speed interrupt response, a digital signal processing capability, having a high-level language instruction HLL support, to facilitate the implementation of the C language compiler. 由于单片机是作模块控制器,因此结构上也采用模块的结构。 As the device is the controller for the module, and therefore the structure of the module structure is employed. 16位CPU,系统集成模块SIM,串行队列模块QSM,通用定时器GPT,8/10位模数转换器ADC,高速内部总线IMB。 16-bit CPU, system integration module SIM, a serial queue module QSM, general-purpose timer GPT, 8/10-bit ADC ADC, a high-speed internal bus IMB.

CPU16的特性:-三个16变址器。 CPU16 features: - three 16 The modifier.

-两个16位累加器。 - Two 16-bit accumulator.

-1M字节程序存贮和1M字节数据存贮器的寻址能力。 -1M and 1M bytes of program memory byte data memory addressing capability.

-具有面向DSP处理的控制。 - a control for DSP processing.

-可直接支持HLL高级语言。 - Direct support HLL high-level language.

-后台纠错模块。 - Background correction module.

-快速中断响应。 - Fast interrupt response.

-完整的16位操作指令。 - full 16-bit operation instructions.

SIM系统集成模块的特性:-外部总线接口EBI-可程控的片选输出。 System Integration Module SIM characteristics: - External bus interface EBI- programmable chip select outputs.

-系统保护子模块。 - sub-system protection module.

-定时器时钟监视和总线监视。 - bus timer clock monitoring and surveillance.

-两个8位双功能I/O端口。 - two 8-bit dual function I / O port.

-两个7位双功能I/O端口。 - seven pairs of two function I / O ports.

-PLL时钟系统。 -PLL clock system.

8/10位模数转换器ADC的特性:-八个通道8/10位A/D转换。 8/10 bit ADC the ADC characteristics: - eight channel 10-bit A / D conversion.

-八个结果寄存器。 - Eight result register.

-三个结果调整子模块。 - three sub-modules are adjusted.

-一个8位数据输入端口。 - a 8-bit data input port.

串行队列模块QSM:-增强的串行通信接口。 Serial queue module QSM: - enhanced serial communication interface.

-队列串行外设接口。 - Queued Serial Peripheral Interface.

-一个8位双功能I/O端口。 - dual function 8-bit I / O port.

通用定时器GPT的特性:-两个自由运行带有预分频的16位计数器。 The general purpose timer GPT Features: - two free-running 16-bit counter with the prescaler.

-三个输入捕获通道。 - three input capture channels.

-四个输出比较通道。 - Comparison of four output channels.

-一个输入捕获/输出比较通道。 - a capture input / output compare channels.

-一个脉冲累加/事件计数输入。 - a pulse accumulation / event count input.

-两个脉冲调宽输出。 - two pulse width modulated output.

-一个8位双功能I/O端口。 - dual function 8-bit I / O port.

-两个可选的离散输入。 - Two optional discrete input.

-可选的外部时钟输入。 - optional external clock input. 数据处理电路:数据处理电路是中央处理器与收发信电路连接的纽带,是系统编译码方案的执行者,由发送数据处理,接收数据处理,内部时钟变换,系统状态控制键盘信号处理等模块组成。 The data processing circuit: a data processing circuit is a central processing unit and a link connected to the transceiver circuit, the system is performed by encoding and decoding scheme, the transmission data processing, the received data processing, the internal clock conversion, the system state control keyboard and other signal processing modules . 发送数据处理(编码):发送数据包括:接收方地址码,文字图象在ROM中的地址码、帧同步码、位同步码、奇偶校验码及示警码等,将上述各种功能码以一种合理的方案编排,如POCSAG码,达到传递文字信息的目的。 The transmission data processing (encoding): transmitting data comprising: a receiver address code, address code character image in the ROM, a frame synchronization code, synchronization bits, parity codes and warning codes, the codes in the above-described various functions a rational layout program, such as POCSAG code, the purpose of transmitting the text message. 发送数据处理电路是与CPU协调完成上述编码过程的,也就是通常所说的基带信号,基带信号与频带利用率、功率利用率、码间串扰、信噪比、传输速率等都有不可分割的联系,对其主要要求是:编码效率高、差错控制能力及实现简单。 The transmission data processing circuit is a CPU in coordination with completion of the encoding process, which is commonly referred to as a baseband signal, the baseband signal with bandwidth efficiency, power efficiency, intersymbol interference, SNR, have integral transmission rate contact, its main requirements are: high efficiency coding, error control and simple. 接收数据处理(译码):接收数据处理是发送数据处理的反过程,即对接收波形进行识别,对其主要要求是:译码错误概率小,快速简单和译码时延小。 Received data processing (decode): the data receiving process is a process of reverse transmission data processing, i.e., identification of the received waveform, its main requirements are: decoding error probability, small and fast and simple decoding delay. 系统状态控制:系统状态控制是由内部控制程序发出的各种控制指令完成终端机各种功能的综合模块,其控制范围主要包括:-电源电路的通断。 The system state control: the integrated system state control module controls various terminals instruction completion issued by the various functions of the internal control program, which controls scope includes: - a power supply circuit off.

-电源电压变换(DC-AC-DC)-来讯告警。 - a power supply voltage conversion (DC-AC-DC) - to hearing the alarm.

-时钟频率变换。 - clock frequency conversion.

-瞬时功率的产生。 - instantaneous power. 键盘信号处理:为提高文字代码输入速度减少键盘电路相关元器件,提高电路的可靠性,适应单片接口电路的工作原理,采用十六选一模拟开关矩阵键盘电路,其优点在于按键数可随意扩展不需编解码,满足小型化的要求。 Keyboard signal processing: the input speed is reduced to improve the character code associated keyboard circuit components, to improve the reliability of the circuit, adapted to the working principle of a monolithic interface circuit, an analog switch using sixteen selected from the keyboard matrix circuit, which is advantageous in that the number of keys can be freely extended without codec meet miniaturization requirements. 内部EEPROM:内部EEPROM为512字节-1K字节的数据存贮器,用以编制存贮该机的相应地址码,即其身份号。 Internal EEPROM: EEPROM is a 512 byte internal data memory -1K bytes for the preparation of the corresponding address code stored in the machine, i.e. its identification number. 接收数据时计算机内部读取该机特征地址码与收到的特征码比较以确认收讯信号所传递内容的去向。 Wherein the machine inside the computer read address code is compared with the received data when the received signature to confirm the whereabouts of the recipient of the transmission signal content. 发送数据时读取和特征码发送至基台,由基台发至目标机。 And transmitting the read pattern data is sent to the base station, sent by the base station to the target machine. 键盘与键盘接口电路:键盘是完成人一机对话的基础设备,由扩展的数据线组成串矩阵形式,CPU定时扫描各键的状态如有按键按下则发送相应的命令或启动相应的子程序使操作者在屏幕上看到相应的显示,完成文字、图象的编辑工作。 Keyboard and keyboard interface circuit: the keyboard is done infrastructure man-machine dialogue, the data line by the extended string consisting of a matrix, the scanning timing of the CPU if the state of each key button is pressed or the corresponding command is sent to start the appropriate subroutine It allows the operator to see on the screen display corresponding to complete the editing of text, image.

键盘接口电路是将数据处理电路的数据线进行扩展以满足所需功能键数目的要求。 Keyboard data line interface circuit is a data processing circuit to be extended to meet the required number of functional keys. 由于使用八选一及十六选一电子开关,使所需键数可无限扩展。 The use of eight and selected from a sixteen selected from an electronic switch, the number of keys required can be infinitely extended. I/O接口电路:是CPU及数据处理电路与外设联结功能模块,与外部存贮器的接口方法分为并行总线与串行总线接口方式,由于本发明所需外扩存贮器的分类多及容量大,所以采用并行总线接口方式,满足CPU对外存贮的读写要求。 I / O interface circuit: a CPU and a data processing circuit coupled to the peripheral function module, and an external memory interface method into a parallel bus and a serial bus interface, since the desired classification extended memory of the present invention and multiple large capacity, so that a parallel bus interface mode, to meet the requirement to read and write the external memory of CPU. I/O接口电路应有如下特征:-与单片机MCU或微处理器MPU连接的8位双向数据总线。 I / O interface circuit should have the following features: - connected to the microprocessor MPU or MCU MCU 8-bit bidirectional data bus.

-提供两个8位双向I/O端口。 - provides two 8-bit bidirectional I / O port.

-内部有两个可编程的控制寄存器和数据方向寄存器。 - two internal programmable control register and data direction register.

-四根独立控制中断输入线和两根可作外围控制的输出线。 - four independent control may interrupt input line and two output lines for the control of the peripheral.

-输入/输出的应答控制逻辑。 - response control logic inputs / outputs.

-三态高阻的可直接驱动三极管外围线。 - a high-resistance tristate driver transistor peripheral lines directly.

-外围接口A可驱动CMOS。 - A peripheral interface can drive CMOS.

-外围接口A和B与TTL兼容。 - A and B peripheral interface compatible with TTL.

-芯片静态操作方式。 - chip static operation.

-具有中断控制及屏蔽能力。 - have the ability to interrupt control and shielding. RAM动态存贮器:动态数据的存贮如文字、图形编辑;来讯文字显示数据等。 Dynamic RAM memory: storing dynamic data such as text, graphics editor; character information to the display data and the like. ROM静态存贮器(只读存贮器):该存贮器阵列中存有汉字、固定短语及图形点阵数据即字库,也是完成各种指令及操作状态的固定程序存贮器。 Static memory ROM (read only memory): there characters in the memory array, and a fixed phrase dot matrix font data, i.e., also in fixed program memory instructions and a variety of operating states. EPROM静态存贮器:EPROM静态存贮器是存贮该机服务项目选件编程、设置加密点等可修改的程序存贮器。 Static EPROM memory: EPROM memory is stored in a static machine Services programming options, settings can be modified program memory encryption points. 显示器:采用高性能的自动后备光液晶显示器件(LCD),该器件具有低工作电压、低功耗、长寿命等特点,能显示16×16点阵汉字、特种表意符号等。 Display: high-performance automatic back-light liquid crystal display device (LCD), the device has a low operating voltage, low power consumption, long life, 16 × 16 dot matrix capable of displaying characters, and other special ideogram. 发送数据通路模块包括:-天线:天线的基本性能:天线系统包括从天线到传输线接头为止的所有匹配、平衡、移相或其它耦合装置,是为了有效的将传输线送来的高频传导电流转变成空间的电磁波或反过来将空间电磁波转变成传输线中的信号功率,由于个人终端是一种便携式移动设备,根据天线用作发射和接收时进行能量转换的可逆性,它们的参数在收发时保持不变,所以天线的参数在收发时是通用的。 Transmitting a data path module comprising: - a high-frequency conduction current transition for effective transmission line fed antenna system, from the antenna until the transmission line junction of all matches, balance, transfer, or other coupling means relative, is:: the basic performance of the antenna of the antenna electromagnetic wave into a space or spaces in turn converted into an electromagnetic wave signal power in the transmission line, since the personal terminal is a portable mobile device, according to the antenna is used as an energy reversibly transition of transmission and reception, their parameters held in the transceiver unchanged, so the antenna when the parameters are common to the transceiver.

个人终端机由于受安装条件的限制,天线的性能容易受环境的影响,但天线又是整个系统链路的重要环节,对通信质量有直接影响,因此对天线有着特殊要求。 Individual terminals due to restrictions by the installation conditions, the performance of the antenna is easily affected by the environment, but also an important part of the whole antenna system link, has a direct impact on the quality of communication, so the antenna has special requirements. 首先,由于终端机经常处于移动状态,位置不固定,因此天线在水平面上并不呈现方向性,这样不论与基站的相对位置如何变化,都能稳定地收发信号;其次由于必须做到收发兼用,在以双频双工方式工作时,收发频率间有保护频带,天线必须有足够宽的工作频带,才能兼顾收发的信号频率。 First, since the terminal is in the frequent moving state, the position is not fixed, so that the antenna does not exhibit directivity in the horizontal plane, so that irrespective of changes in the relative position of the base station, can stably transmit and receive signals; Second, because dual-purpose transceiver must do, when operating in dual frequency duplex, frequency guard band between the transceiver, the antenna must be sufficiently wide operating band, in order to take into account the frequency of the signal transmitted and received. -环行器及收发信滤波器:个人终端采用双工方式,收发同时工作必须有双工器使收发互不影响,发信机产生的射频功率对接收机的影响有两个方面:一是发信频率的强信号使接收机前级产生阻塞,要消除这种影响必须使进入接收机前级的本机发射信号抑制到阻塞电平以下,二是发信频谱以收信通带内的噪声会直接进入接收机因此影响接收文字信息的正确率,所以必须在发信输出端抑制这部分噪声,使它低于接收机本自在天线输入端的等效噪声功率。 - the circulator and the transceiver filter: a personal terminal using duplex mode, the transceiver must simultaneously allows the transceiver duplexer independently of each other, the influence of the generated RF power transmitter to the receiver has two aspects: one is made strong frequency band signal of the front stage as blockage receiver, to eliminate this effect before entering the stage must be native to suppress the blocking signal receiver transmit level or less, and the second is to transmit spectral noise within the receiver pass band directly into the receiver thus affect the accuracy of the received text message, it is necessary to suppress the noise in this part of the transmission output, so that it is lower than the equivalent noise power of the receiver antenna input of this freedom. 前一种影响的消除,要依靠在接收机输入端接入收信滤波器,以阻止发信功率进入发信滤波器,以抑制发信频谱造成在收信频带上的噪声功率。 Eliminating the influence of the former, to rely on receiving the access at the receiver input filter to prevent the transmission power into the transmit filter to suppress noise caused transmit spectral power at the receiving band. 用环行器隔离收发滤波器,能提高收、发信间的隔离度。 Isolation circulator transceive filter can improve the yield, the isolation between transmission. 一频率合成器:本发明的双工窄带调频制移动文字通讯系统因需要几个不同频率进行通讯,而频率间隔为25kHz,这就要求通讯设备的频率来源应该可变,同时也要求稳定,这样就要求有一人晶体振荡器,它能给出一个稳定频率,但频率只是一个,若要给出不同频率,就得设法进行变换,采用频率合成技术就是通过频率进行加、减、乘、除的运算,将一个或几个标准频率变成多个所需频率的技术。 A frequency synthesizer: a duplexer of the present invention manufactured by a narrowband FM text mobile communication systems because of the need for several different communication frequencies, and the frequency interval of 25kHz, which requires frequency sources communications equipment should be variable, also requires stable, so it requires one crystal oscillator, which can give a stable frequency, but only a frequency, to be given different frequency, have tried to be transformed, using a frequency synthesis technique is to add, subtract the frequency, multiply, and divide operation, one or more of several art standard frequency becomes a desired frequency.

频率合成的方法很多,本发明采用间接合成法,间接合成法是用一个或几个参考频率源通过谐波发生器、混频和分频等产生大量的谐波或组合频率,然后使用锁相环,把压控振荡器的频率锁定在某一谐波或组合频率上,由压控振荡间接产生所需要的频率输出。 Many methods of frequency synthesis, indirect synthesis method of the present invention, the indirect synthesis is using one or more reference frequency source by the harmonics generator, mixing and dividing the like, or combinations produce a lot of harmonic frequencies, and then using the lock ring, the frequency of the voltage controlled oscillator locked to a harmonic frequency of or in combination, the oscillation frequency output by the voltage controlled indirectly required. 间接式合成器又称为锁相式合居器,它的主要优点是:由于锁相环相当于窄带跟踪波波器,它具有很好窄带的跟踪特性,因此能很好的选择所需频率,同时很好的抑制寄生分量,避免了大量使用滤波器,十分有利于所要求的集成化和小型化。 Also known as indirect synthesizer lock-type engagement home device whose main advantages are: due to the narrow trace wave corresponding to a phase locked loop, a narrowband having good tracking characteristics, and it is possible to select the desired frequency good while good suppress spurious components, avoiding the heavy use of filters, very conducive to integration and miniaturization required. 这里的锁相环为可变数字分频环,其特点是在环路中采用可变数字分频器,数字鉴相器。 Here PLL digital frequency variable ring, which is characterized by a variable digital frequency divider in the loop, the digital phase detector. -调频调制器:将有用信号加载到高频上的过程称调制。 - FM Modulator: the useful signal during the loading to said modulation frequency. 在本发明的双向文字移动通讯终端中,为了扩大通信容量,提高频率利用率,本发明采用窄带调频调制方式,利用直接调频法,将受到调制信号控制的可变电抗元件(变容二极管)接入载波的振荡回路,直接改变载波频率实现线性调频,集成锁相环的推广使这种直接调频方式较好地解决了频率稳定度与频偏的矛盾。 In two-way mobile communication terminal according to the present invention, the text in order to expand the communication capacity and improve frequency utilization efficiency, the present invention uses a narrowband FM modulation, frequency modulation by the direct method, the modulated signal for controlling the variable reactance element (varactor diode) access carrier tank, directly changes the carrier frequency to achieve chirping promote integrated PLL makes this direct frequency modulation solve the contradiction between the frequency offset and frequency stability. -倍频器:使用倍频器的目的不但是为了提高载波频率,而且是为了增加调频信号的频偏,尤其是当频率合成器的频率由于条件限制不能很高时,往往需要几次倍频,倍频器必须有足够的激励电平,为了在倍频器输出端选出所需的谐波,倍频器负载回路需要有良好的选择性,并在推动功放前用一窄带滤波器抑制倍频引起的各种杂散分量。 - Multiplier: The purpose of the frequency doubler in order to improve not only the carrier frequency, and in order to increase frequency deviation of the FM signal, especially when the frequency synthesizer is not high due to conditions, often require several multiplier frequency multiplier must have sufficient drive level, in order to select a desired harmonic frequency output of the frequency multiplier load circuit it requires a good selectivity, and suppressing a narrow-band filter prior to pushing amplifier various frequency spurious components caused. -功率放大器:功率放大器的作用是将倍频器产生的射频信号放大到额定功率。 - PA: the role of a power amplifier amplifying a radio frequency signal is generated by the multiplier to the nominal power. 本发明采用厚膜混合集成功放作为功率放大器件,其特点是:有源和无源器件组合成整体,体积小,可靠性高,工作频带宽,外接的元件少,可不需调整元件。 The present invention uses thick film hybrid integrated amplifier as a power amplifier element, characterized by: a combination of active and passive components into a whole, small size, high reliability, frequency band, fewer external components, can no adjustment element. 这给整机生产调测带来了方便。 This gives the whole production commissioning the advantage. 厚膜混合集成功放块应有两种控制功率的电路,一种是自成环路的自动功率控制电路,它既能保持输出功率恒定,又能保护功放块。 Thick film hybrid integrated amplifier power control circuit shall have two blocks, one is from the loop into the automatic power control circuit which can maintain the output power constant, while protecting the amplifier block. 另一种功率控制是为了限制辐射场强,减少通讯系统互相干扰,这时功放块的输出功率根据自己接收到的信号强度进行控制。 Another power control is to limit the radiation field strength to reduce interference between communication systems, when the output power amplifier block is controlled based on the signal strength of its own received. 当通信对象较近时,接收信号较强,功率放大器的输出功率就自动降低。 When a close communication partner, the received signal is strong, the output power of the power amplifier is automatically reduced. 这样既保持文字传输质量,节省电能,又不会对其它通讯设备造成干扰。 This will not only keep the text transmission quality, save energy, will not cause interference with other communication devices. 收信数据通路模块包括:-高频放大器:高频放大器的作用是放大天线接收到的微弱射频信号,以提高收信设备的灵敏度,降低后级(特别是混频级)的噪声,提高回路的选择性,弥补回路损耗。 Receiving a data path module comprising: - a high frequency amplifier: the role of high-frequency amplifier is to amplify the received weak radio-frequency antenna signals, to increase the sensitivity of the receiving apparatus, after the reduction stage (in particular the mixer stage) of the noise and improve circuit selective, to make up for return loss. 本发明采用双栅场效应管,双栅场效应管作高频放大器能使输入阻抗高、灵敏度高、噪声系数低、输出阻抗高,改善了收信机的性能,双栅场效应管的工作动态范围大,能允许较大的输入信号,抗阻塞能力强。 The present invention employs a dual-gate FET, a dual gate FET amplifier can be frequency high input impedance, high sensitivity, low noise figure, high output impedance, the receiver performance is improved, dual-gate FET work dynamic range, allow larger input signal, a strong anti-blocking ability. -第一混频器:第一混频器的作用是将高频放大电路送来的射频信号与第一本振信号混频,得到频率较低的中频信号。 - a first mixer: the role of the first mixer is a high frequency amplifying circuit and the first radio frequency signal sent present oscillation signal to produce a lower frequency IF signal. 第一混频器对接收机的灵敏度和非线性指标影响较大,应选用较好的器件和电路。 First mixer great influence on the sensitivity of the receiver and the nonlinear index should be used in preferred devices and circuits. 本发明的混频级选用的器件为栅场效应管。 Mixer stage device of the present invention are selected for the FET gate. -第一中放、第二混频、第二中放、鉴频、滤波、限幅电路模块:第一中放是弥补第一混频器经滤波器后的损耗,并将中频信号进一步放大。 - in the first place, a second mixer, a second intermediate level, frequency, filtering, limiter circuit module: is a first intermediate level filter to compensate for the loss after the first mixer, and intermediate frequency signal is further amplified . 第二中放及鉴频使用了锁相环鉴频器。 A second intermediate level and a phase locked loop frequency discriminator used discriminator. 锁相环解调电路利用压控振荡器产生的调频信号和输入信号之间的相位差检出调制信号,并将误差信号反馈到压控振荡器。 PLL demodulation circuit using the phase difference between the input signal and the FM signal detection voltage controlled oscillator generates a modulation signal and an error signal is fed back to the voltage controlled oscillator. 环路锁定时压控振荡器的瞬时频率跟踪输入信号频率的变化,因此压控振荡器的控制信号与输入信号频率的变化是一致的。 The instantaneous frequency of the VCO to track the input signal frequency when the loop is locked, and therefore changes the frequency of the control signal and the input signal of the voltage controlled oscillator is the same. 锁相环解调有很多优点。 PLL demodulator has many advantages. 选择不同的锁相环参数,可以适应各种不同的要求。 PLL select different parameters, it can be adapted to different requirements. 收发信控制器;收发信控制器是为完成收发之间各功能部件之间的转换而设置的控制装置,它所发出的所有控制信号均由中央处理器发出控制指令。 The controller transceiver; transceiver controller is a control device for the translation between the functional parts provided between the transceiver and all the control signals it sends a control instruction issued by the central processor. 本终端电气性能及测量方法如下:-发信端电气性能及测量方法:-载波额定功率:载波额定功率是指发信机在未调情况下,传递到标准输出负荷上的平均功率,本发明的双向文字移动通信终端发射时瞬时功率未超过无线电主管部门的最大允许值。 Electrical properties and methods of measurement for the terminal follows: - transmit end electrical properties and measuring methods: - Rated Power Carrier: Carrier refers to a rated power is not adjusted in the case of the transmitter, is transmitted to the average power output of the standard load, the present invention text bidirectional mobile communication terminal when the instantaneous power does not exceed the radio transmitting administrations maximum allowed value.

具体的测量方法是采用功率计测量。 Specific measurement method is to use a power meter. 将输入阻抗50Ω,频率量程为28MHz的功率计测量头接到发信机射频输出端,启动发射电路,所测量功率值为标称值在+1.0dB—-0.5dB的范围内。 The input impedance of 50 [Omega, the frequency range of 28MHz RF power meter head to the transmitter output terminals, start transmitting circuit, 1.0dB + power value measured at the nominal value - the range of 0.5dB. -载频频率容限:发信机载频频率容限是指实测未调载频与标称值之差。 - Carrier frequency tolerance: the transmitter carrier frequency tolerance refers Found unmodulated carrier frequency difference between the nominal value.

载频频率容限的测量方法是将发信机与标准负荷连接,并耦合部分能量至频率计,在频率计输入电平正常情况下测量频率。 Carrier frequency tolerance measurement transmitter is connected to the standard load, and part of the energy is coupled to a frequency meter, the frequency counter input under normal level measurement frequency. 发信机在未调制情况下工作,在正常条件上极限条件下分别进行测量。 Transmitter operates at unmodulated case, measured on the normal conditions under extreme conditions, respectively. 在280MHz左右频段内间隔为25KHz时频率容限的值不应超过±0.016Hz。 Should not exceed ± 0.016Hz about 280MHz frequency band spacing is 25KHz frequency tolerance value. -调制频偏及其限制:调制频偏是指已调射频信号的瞬时频率和载频的差值,包括下列内容:调制灵敏度:调制灵敏度是指发信机射频输出端获得额定频偏时,其原始数据码为1KHz时的电压值额定频偏为最大允许频偏的60%。 - Its frequency deviation limit: Modulation deviation refers to the modulated RF signal and the instantaneous frequency difference between the carrier frequency, including the following: Modulation Sensitivity: Sensitivity is the modulation RF transmitter refers to the rated output of the frequency offset is obtained, data symbols to their original 1KHz frequency offset when the rated voltage value of the maximum allowable deviation of 60%. 使用调制度仪测量频偏,发信机以额定功率输出,用低频电压表读取1KHz的电压值即调制灵敏度。 Using the measured frequency offset modulation, transmitter rated output power, the read voltage of 1KHz i.e. low frequency modulation sensitivity voltmeter.

最大允许频偏:最大允许频偏是根据频道间隔规定的已调信号瞬时频率与标称载频的最大允许值。 The maximum allowable deviation: The maximum allowed value is the maximum allowable deviation signal nominal frequency and the instantaneous carrier frequency modulated according to a predetermined channel spacing. 在频道间隔为25KHz时,最大允许频偏为±5KHz,按输入灵敏度值高20dB;及改变调制信号频率在300-3KHz之间变化所读出的最大频偏值。 When the channel spacing is 25KHz, the maximum allowable deviation of ± 5KHz, by 20dB higher input sensitivity values; varying the modulation signal frequency and the maximum deviation value between the read 300-3KHz change.

非线性失真系数:在数据输入端加入标准数字信号,在发射端经解调测得的二次及更高次谐波成分的总有效值对整个信号的有效值之比为非线性失真系数。 Nonlinear distortion coefficient: addition of standard digital data signal input terminal, measured at the transmitting end through a secondary higher harmonic component and the demodulated total rms rms ratio of the entire signal for nonlinear distortion coefficient. 不应高于10%,主要考虑产生误码的概率。 Should not be higher than 10%, the main consideration of the probability of error is generated.

邻道辐射功率:邻道辐射功率是发信机在额定调制状态总输出功率中落入相邻频道接收带宽内的部分。 Adjacent channel radiation power: adjacent channel transmitter is radiated power receiving portion adjacent channel falls within the bandwidth of the total rated output power modulation state. 邻道辐射功率是调频频谱展宽和噪声等所产生的平均功率的总和。 Adjacent channel radiation power is the sum of spectral broadening and FM noise generated by the average power.

有三种测量方法,它们分别是:邻道功率计测量法;频道分析仪测量法;测试接收机测量法,技术要求邻道功率应比载波功率低70dB以上。 There are three methods of measurement, they are: adjacent channel power meter measurement; channel analyzer measurement; test receiver measurements, the technical requirements of adjacent channel power ratio should be lower than the carrier power 70dB. -发信(载波)启动时间:发信启动时间是指当发信机控制产生载波功率输出时所需的时间。 - transmission (carrier) start time: transmission start time is the time required for generating the control when the transmitter output carrier power. 用线性峰值检波器测量载波轨迹上升至最大值的50%时所需的时间间隔应小于100ms。 Linear increase in peak detector tracks the carrier to the time required for 50% of maximum spacing should be less than 100ms. -接收端电气性能及测量方法:-噪声系数与灵敏度:噪声系数与灵敏度是衡量接收机对微弱信号接收能力的两种表示方法。 - measuring the electrical properties and a method of receiving end: - the noise figure and sensitivity: the sensitivity and noise figure is a measure of two representations of the receiver of the weak signal reception. 对于接收机噪声系数与灵敏度是衡量其质量优劣的重要指标。 For noise figure of the receiver sensitivity is a measure of an important indicator of its quality merits.

噪声系数是指接收机输出端测得的噪声功率与把信号源内阻作为系统中唯一的噪声源而在输出端产生的热噪声功率之比,以dB表示。 The noise figure is the ratio of the measured receiver output power and the noise of the source resistance is generated at the output of the system as the only noise source of thermal noise power, expressed in dB.

灵敏度是指用标准数字信号调制时,在接收机输出端得到规定的信噪比,且输出功率不小于标准数字信号额定功率的50%情况下,接收机输入端所需要的最小信号电平,以μV或dBμV表示。 Sensitivity is the smallest when the signal level in the digital signal modulation standard, resulting in the output of the receiver a predetermined signal to noise ratio, and the output power of not less than the standard digital signal of 50% of rated power, the required receiver input, expressed in μV or dBμV.

测量方法有三种:信噪比测时法;信纳比测量法及抑制灵敏度测量法。 There are three methods of measurement: when the SNR measuring method; SINAD measurement sensitivity and measurement suppressed. 灵敏度的最大指标应超过+6dBμV。 The maximum sensitivity index should exceed + 6dBμV. -大信号信噪比:大信号信噪比是指射频输入信号足够强时,在接收机串行数据输出端测得的信噪比值。 - large signal to noise ratio: SNR refers to a large signal when the RF input signal is strong enough, the serial data output of the receiver measured signal to noise ratio value. -限幅特性:接收机的限幅特性是指输入射频电平在一个规定范围内变化时,输出串行数据电平的稳幅性能。 - limiting properties: clipping characteristics of the receiver means when the RF input level is varied within a predetermined range, the serial data output leveled performance level. -调制接收带宽:接收机的调制接收带宽是指接收机接收一个输入电平比实测灵敏度高+6dB并使输出信号的信纳比降回到12dB时的输入信号调制频偏的两倍。 - receiving bandwidth Modulation: a modulation means receiving bandwidth of the receiver input receiver for receiving a modulated input signal is twice higher than the level of sensitivity Found SINAD + 6dB and 12dB drop back an output signal when the frequency offset.

测量调制接收带宽时,利用了增大频偏而使调频频谱展宽的方法,但因为中频带宽是一定,因而随着频偏的增大,失真也增加,从而使信纳比降低。 Modulation measured reception bandwidth, using the method of increasing the frequency deviation of the FM broadening the spectrum, but because the IF bandwidth is constant, and thus with increasing frequency offset, distortion increases, so that the reduction ratio is satisfied.

调制接收带宽直接反映了接收机工作时的动态带宽,它不仅与中频滤波器的带宽有关,而且与解调失真、本振频率及中频滤波器中心频率的准确有关,因而更有实用意义。 Directly reflects the modulated reception bandwidth of the receiver dynamic bandwidth work, it is not only related to the bandwidth of the IF filter, but the distortion and demodulation, the local oscillation frequency accurate and relevant IF filter center frequency, and thus more practical sense. -抗互调干扰性能:抗互调干扰性能是指接收机对与有用信号的频率有特定关系的两个或更多个无用信号的抑制能力,它用干扰信号与灵敏度的相对电平(dB)来表示。 - Anti intermodulation interference: Anti intermodulation performance is the ability to inhibit the receiver specific relationship with the useful signal frequency of two or more unwanted signals, it is a relative level of the interfering signal and sensitivity (dB )To represent. 当输入有用信号的电平比灵敏度于3dB时,引起互调的该无用信号的存在使接收机的输出信纳比降回到12dB。 When the input useful signal level at the time of sensitivity than 3dB, causing the presence of unwanted intermodulation signal causes the receiver output signal back down to Nabi 12dB. 这时的互调干扰电平与有用信号电平比值的dB数,即为接收时互调干扰的抑制能力。 In this case the number of dB intermodulation interference level and the wanted signal level ratio, that is, when the reception intermodulation interference suppression capability. -同频道抑制:接收机的同频道抑制是指接收机抗同频道干扰的能力,它用干扰信号与有用信号电平之差(dB)表示,当输入有用信号的电平比灵敏度高3dB时,该干扰信号的存在使接收机的输出信纳比降回到12dB,此时的有用信号电平与干扰信号电平之差的dB即为抗同频道干扰指标。 - Co-channel inhibition: co-channel receiver is the ability to inhibit the anti-receiver co-channel interference, it is a differential interference signal level of the useful signal (dB) indicates, when the input useful signal level is higher than 3dB sensitivity , the presence of the jamming signal output of the receiver to drop back SINAD 12dB, in this case a useful signal level and the dB difference between the interference signal level of co-channel interference is the anti index. -接收机启动时间:接收机启动时间是指输入已调射频信号后产生串行数字信号输出功率所需的时间应小于150ms。 - receiver start time: start time is the receiver input to produce the modulated RF output signal in a time series digital signal should be less than the power required to 150ms.

Claims (2)

1.一种双向文字移动通信终端,其特征在于:它包括收、发信电路,还包括编解码电路;收信电路依次由收信滤波器,高频放大器,第一混频器,第一中放,第二混频器,第二中放,锁相环鉴频器,数据滤波器,数字限幅器,数据同步码元变换电路连接而成;发信电路依次由直接式频率合成器,锁相环调频调制器,N级倍频器,带有功率自环控制及接受场强自动调节的功率放大器,发信滤波器,环行器、天线连接而成,编解码电路依次由中央处理器的控制口分别与储存器的RAM、ROM、EPROM、数据口、总线、接口电路、显示器、码元变换连接,另外电源经过电压变换后分别接上述各电路;本终端电源电路还含有省电控制、告警控制、状态控制、瞬时功率其它辅助电路。 A two-way text mobile communication terminal, characterized in that: it comprises receiving, the transmission circuit further comprising a codec circuit; sequentially receiving circuit receiving a filter, a high frequency amplifier, a first mixer, a first in place, a second mixer, a second intermediate level, phase locked loop frequency discriminator, the data filter, a digital slicer, a data synchronization circuit connected to each transformed symbol; transmission circuit sequentially by the direct frequency synthesizer , PLL FM modulator, N multiplier stages, with the control loop and receiving power from the field of automatic adjustment of the power amplifier, the transmission filter, the circulator, connected to each antenna, codec circuit sequentially processed by a central 's control port, ROM, EPROM, data port, a bus, an interface circuit, a display, connected to each transformed symbol to the reservoir of RAM, after the additional supply voltage converting circuit are connected to each; for the terminal power supply circuit further comprising control, alarm control, state control, the instantaneous power other auxiliary circuits.
2.如权利要求1所述的终端,其特征在于:所述发信电路的频率合成器为锁相式合成器;功率放大器中包含有自成环路的自动功率控制电路和限制辐射场强的功率控制电路;收信电路中的高频放大器为双栅场效应管。 Strong self-contained power amplifier into the loop automatic power control circuit, and limiting the radiation field; frequency synthesizer phase-locked to the transmission circuit Synthesizer formula: 2. The terminal as claimed in claim 1, characterized in that a power control circuit; receiving circuit is in the high-frequency amplifier dual-gate FET.
CN 95105335 1995-05-08 1995-05-08 Two-way characters mobile communication terminal CN1047275C (en)

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US7116784B2 (en) 2002-09-30 2006-10-03 Motorola, Inc. Method and apparatus for authenticated reporting in a mobile communication device
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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 Selective call signaling system and method with combined wide area paging and high data rate transmissions via radio telephoen transceivers

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EP0544456A2 (en) * 1991-11-27 1993-06-02 AT&T Corp. Paging arrangements in a cellular mobile switching system
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