電子類外文翻譯—小靈通簡介introductionphsphones

1、<p><b>　　中文6456字</b></p><p>　　Introduction PHS phones</p><p>　　PHS phone is a miniature of the 1900 MHz radio transceiver call machine. Transmitting power only 10 mw, minimal ra

2、diation, the only mobile phone handset 1/200, it is "green communications tool," said. </p><p>　　1, features </p><p>　　①, murmur of small, clear sound quality, can the city and sound q

3、uality comparable to fixed telephone, and confidentiality than fixed telephone strong. </p><p>　　②, p call can be called anytime, anywhere, and with other PHS phone calls directly. </p><p>　?、?

4、LCD displays are a number of background light, easy to watch. </p><p>　?、? a telephone directory function, ringing sound choice, volume control, and other functions. </p><p>　　⑤, have a button o

5、n the redial function. </p><p>　?、? the largest PHS phones can be a feature of the home phone or office phone has a phone number, from one side of the other party can automatically cut off, to prevent eavesd

6、ropping. PHS phones can also have a virtual number, so home or office phone and PHS phones can call each other. </p><p>　　2, the band </p><p>　?、? 1895 MHz-1906.1MHz allocated to the private net

7、work </p><p>　?、? 1906.1 MHz-1918.1MHz distribution to the public network </p><p>　　Each carrier frequency of 300 KHz bandwidth is available on the band frequency is 77, each district station us

8、ed by the carrier frequency of: f = 1895.1 +0.36 X (N-1) MHz in the N-type for the carrier frequency, , The range is 1-77, f for the use of the air with the corresponding frequency N </p><p>　　For example: &

9、lt;/p><p>　　Carrier frequency N = I f = 1895.1MHz </p><p>　　Carrier frequency N: 2 f = 1895.46MHz </p><p>　　Carrier frequency N = 3 f - 1895.82MHz </p><p>　　Carrier freque

10、ncy N = 77 f = 1922.46MHz </p><p>　　3, the phone modeling </p><p>　?、? the total weight: 80 ~ 90 g (plus panels of less than 200 g) </p><p>　?、? size: two small boxes so much firewo

11、od </p><p>　?、? power supply capacity: continuous talk time of about 8 h, in a state reception for 500 h </p><p>　　④, the PHS models currently available in the market mainly UTS702-P, UTS602-A,

12、UTS702-S331, UTS708-J, UTS708-SY, and so on. </p><p>　　4, "Little Smart" mobile phone functions </p><p>　　PHS phones there are three main series: </p><p>　　1), UTS700 (pop

13、ular) series of mobile phones, a low-cost mobile phones, LCD smaller, only figures show that there are four kinds of ringing and 20 kinds of music, can store five calls have been recorded and five pulling phone records,

14、phone book can be Store 20 phone numbers. The phone has been eliminated. </p><p>　　2), UTS702 (charisma) phones, mobile phones are mid-range and medium-sized LCD Chinese / English, in addition to 700 series,

15、 also a function of time, vibration, hands-free, voice recording, voice and data communications. Representative models have 702,702-331. </p><p>　　3), UTS708 (scenery) phones, a high-end mobile phones, large

16、-screen LCD Chinese / English, can store 500 phone numbers, text message to support the Chinese character input. </p><p>　　Second, the PHS mobile phone technology with the principle of indicators </p>

17、<p>　　1), the technical indicators PHS </p><p>　　Transmitting power: 10 mw (average), 80 mw (peak) </p><p>　　Frequency: 1895.150 ~ 1917.950 MHz </p><p>　　Sensitivity: less tha

18、n 16 db ~ V (≤ 97 dbm) </p><p>　　Air interface: RCR STD-28 Version 2 </p><p>　　Carrier interval: 300 KHz </p><p>　　Communication: TDMA / TDD </p><p>　　Modulation: n/4QP

19、SK </p><p>　　Transfer rate: 384 Kbps </p><p>　　Voice encoding: 32 K bps ADPCM </p><p>　　Melody output: in the great volume when> 73 db </p><p>　　Tone frequency: 2800

20、 HZ, 1800HZ </p><p>　　Zhenchang: 5 ms </p><p>　　2), PHS phone calls were working principle of breath </p><p>　　1, PS PHS breath process </p><p>　?、? when - ? users to c

21、all in the PS on the dial-up and sent out if all the wireless channel are already occupied, it will hear the voices, otherwise PS exhaled information put into the agreement PHS phone number, and The information transmitt

22、ed to the RP. </p><p>　?、? RP PS to receive wireless link came through the information. </p><p>　　⑧, RP will receive information through wired connections to the RPC (base station controllers).

23、</p><p>　　④, RPC PHS agreement information will be converted to an agreement Q.931 information. In addition, RPC (base station controllers) from the output of information extracted dial-up code and put it in

24、to DTMF (dual-tone multi-frequency) signals, Q.931 agreement by a E1 line of the D-channel sent to the RT (infrastructure equipment ). </p><p>　?、? when RT (infrastructure equipment) to receive information b

25、reath, it translates the information to select and connect to the local exchange, the corresponding analog line interface, and access to information given to the RPC. RPC path through the voice of the DTMF (dual-tone mul

26、ti-frequency) dial-up signal to the Central Bureau of switches, after the completion of dial-up, RPC and RP Centre will switch between the PS and the path to link up all the voice. Called party phone ringing and pick, &l

27、t;/p><p>　　2, PS people process called PHS </p><p>　　This feature provides a PS to the basic process of incoming terminals. Through the establishment of a functional equivalent of incoming RT regio

28、nal paging service area. </p><p>　?、? incoming, the simulation of a particular line ringing. </p><p>　?、? RT-detected bell and the incoming flow of information, together with Q.931 agreement gav

29、e the call number RPC. </p><p>　?、? when the RPC received from the RT-sent to the information, it will Q.931 agreement gave the call number RPC. </p><p>　　④, these calls all the mobile phone bas

30、e stations (PS) and FSU, when the pager number and the corresponding PS received from the RP of the paging information, it immediately ringing. </p><p>　　If the destination telephone pick, pick signal throug

31、h the RP, RPC and RT transmitted to the central switch, all the voice path has already established, so the users connected to each other on both sides of the call. </p><p>　　3, Authentication </p><

32、;p>　　Authentication function for the prevention of private users was the right number of officers. Authentication function in the breath, incoming and location of the implementation of the registration process. Teleph

33、one users in the application, operating Chamber of Commerce for distribution of a user's phone number only authentication code. RT-all the authentication code stored in its database, PS each have their own authentica

34、tion code. When the RPC received from the RT-after an authentication cod</p><p>　?、? generate a random code-based authentication and to send it to the PS </p><p>　　②, to receive the results from

35、 the PS </p><p>　?、?findings and the results sent to the RT and inspection results. </p><p>　　4, the handoff </p><p>　　This feature for mobile phones from the state of the RT servic

36、e area of a region moving to other areas to provide continuous communications services. The RPC services in the same region of the handoff, do not have any RT-operation can be connected to the communication channel to sw

37、itch to another RP control of the region. RPC in different areas between the switch, the new RT-RPC to send instructions to establish the handoff of information, RT and then sent to the new RPC to connect information, &l

38、t;/p><p>　　PHS handset itself has many automatic features, in the original call cut off before the channel, they will choose a new base stations, re-establish a connection channel, in this process does not requ

39、ire a network-monitoring wireless links. This re-establish the connection channel, even in RP call services due to inconsistency in the border caused serious quality wireless links and vicious, can provide a stable commu

40、nication services. </p><p>　　C), the PHS mobile phone circuit principle </p><p>　　PHS phones principle circuit diagram shown in Figure 1-1: </p><p>　　Picture this subject are as fol

41、lows: </p><p>　　PHS phones is the work in the 1900 MHz band digital phone, with its circuit structure is very similar to the GSM handsets, base circuit can be roughly divided into three parts: a high-frequen

42、cy part of the launch and receive parts: a control logic part of the transmission The interface, man-machine dialogue segment, followed by the power part. PHS phones because of the degree of integration very good, in man

43、y parts of a complete integrated circuits. </p><p>　　1, RF System </p><p>　　(1), part of the transmitter </p><p>　　Transmitters in part by quadrature modulator fired power amplifier

44、s, transceivers switch and band-pass filter components. </p><p>　?、?quadrature modulator (1 C101) </p><p>　　Quadrature modulator from quadrature modulator integrated circuit components. By ortho

45、gonal frequency modulation integrated circuits enter basic instruction signal, after two mixer output, has received a transfer quadrature modulator output. Quadrature modulator integrated circuits using a DC voltage outp

46、ut unit (automatic level control) control the output intensity. Through the cycle of control, get a constant intensity of the output. If it has the best DC voltage on the output from the control</p><p>　?、?f

47、ired power amplifier (1 C051) </p><p>　　Quadrature modulator output into the monolithic microwave integrated circuits, and then enlarge it to send the necessary strength. Monolithic microwave integrated circ

48、uits by changing the threshold voltage, can control the output power and current consumption levels. </p><p>　?、?transceiver Switching (1 C001) </p><p>　　Transceiver circuit switch connections,

49、may choose to send or receive the time switch, to connect with the antenna. </p><p>　?、?band-pass filter (FL051) </p><p>　　So that by orthogonal modulator signal in the terminal before they reac

50、h the antenna through the band-pass filter to reduce interference, such as the mirror interference, nonlinear harmonic interference, and so on. </p><p>　　(2) of the receiver </p><p>　　To receive

51、 part of the band-pass filter front-end integrated circuit, mixing three components. </p><p>　　① band-pass filter </p><p>　　Band-pass filter including dielectric filters (FL00t), SAW filter surf

52、ace acoustic (FL033), ceramic filters, etc. (FLl01). </p><p>　　Dielectric filters filtering IF signal at every level to reduce do not want to receive the signal from the band. </p><p>　　Ceramic

53、filter made of ceramic materials used high Q band-pass filter filter second-class IF signal to reduce do not want to receive, such as adjacent channel interference. </p><p>　　Surface Acoustic SAW filter, the

54、 frequency with specific characteristics can replace the traditional LE absorption and single-loop, double-tuned circuit. </p><p>　?、?front-end mixer IC (1 C00 Asia) </p><p>　　LNA IC including f

55、ront-end mixer and a mixer. </p><p>　　The one-output Ⅱ. 6GHz band and receive the 1.9 GHz band signal mixing, mixing, was an intermediate frequency signal losers </p><p>　　Out through the media

56、filter to the next level after mixing circuit. </p><p>　?、?mixing two parts (1 C Ⅱ 01) </p><p>　　Part two includes a mixer IF amplifier, two mixers, two intermediate frequency amplifiers, limiti

57、ng amplifier and receiver carrier identification signals, and other functions. 2 IF 10.8 MHz, the signal through ceramic filters, IF amplification and limiting amplifier in the enlarged, the final signal from the interme

58、diate frequency signal transmitted to the control unit. RSSI (received signal strength) to receive signals through Level </p><p>　　Into a DC voltage through this value to identify a carrier signal. </p>

59、;<p>　　2, logic control system (1 C80 b) </p><p>　　Part of the agreement, including control unit, voice processing part of the subsidiary unit. </p><p>　　(1) agreement unit </p>&l

60、t;p>　　Agreement by the channel decoder unit, conditioning unit, the central processing unit, read-only memory, random access memory components. </p><p>　?、?channel decoder unit </p><p>　　Chan

61、nel decoder modules are as follows: modulation of the radio frequency modulation unit sent to the intermediate frequency signal, TDMA / TDD units to deal with the collection of data transmission and reception of data sep

62、aration, from time to time through the control of the radio frequency modules Ⅱ 9.2 MHz output The clock frequency, in control of operations at the same time, the power control unit to provide power control signals in th

63、e output, such as PLL-3V, PTX-3V, RX-3V, TCXO-3V, to pro</p><p>　?、?conditioning unit </p><p>　　Conditioning units from the following components: for π / 4 frequency shift keying signal to provi

64、de identification to receive signal strength of the carrier to identify the management unit, and transmit power control unit. </p><p>　　③ central processing unit, read-only memory, random access memory (1 C8

65、04 1c803) </p><p>　　CPUs for external flash and a built-in (address) of random access memory to provide agreement. It also provides the interface with other units, such as voice codecs modules and related mo

66、dules. </p><p>　　(2), voice processing part </p><p>　　Voice processing part by the decoding unit and a voice interface circuit components: </p><p>　?、?voice decoder unit </p>

67、<p>　　Voice decoding unit negative voice is encoded signal decoder, it also provides a data error when the mute control and suppression, sent transmission tone output, such as dial tone, busy tone-Yinhe. In additio

68、n, by reducing the consumption of current, suspended for each unit of the clock signal, so as to achieve energy-saving purposes. </p><p>　?、?interface circuit </p><p>　　Interface circuits, inclu

69、ding ringing and handset power control unit, ring tones control unit, and other control circuits. They control by subsidiary units. </p><p>　　(3), the subsidiary unit </p><p>　　Subsidiary units

70、including the application of CPU unit IC804, electrical erasable read-only memory, IC803 chip (address code, authentication code) and man-machine interface modules. </p><p>　?、?Application Processor unit <

71、;/p><p>　　Application Processor unit used to control protocol modules and voice coding interface, also used to control wireless calls to accept control unit, keyboard input modules, liquid crystal display modul

72、es and peripheral circuits, such as lighting, and other background. </p><p>　　② Electrically Erasable read-only memory (1 C804) </p><p>　　Electrically Erasable memory stored large amounts of dat

73、a, such as codes, telephone directory information, hardware data, data terminals, and other parameters. Through the 3-wire type of interface and application of microprocessors to maintain communications. </p><

74、p>　?、?man-machine interface unit </p><p>　　Man-machine interface unit including the display unit, keyboard scanning, data interface connector. </p><p>　　Parametric data terminals </p>

75、<p>　　LCD display unit and a liquid crystal display driver in two parts. It controlled by the application of microprocessors, is to display some of the wireless receiver and personal portable telephone to receive th

76、e information, internal state, and the response to the external operating information. Can display three lines of 11 numbers, and direct the status shows 0. </p><p>　　Keyboard scan by a 6:4 composition of th

77、e matrix, through the central processing unit to detect external input keys. Arbitrary key response by the central processing unit is also testing a key input from the disruption of the signal to achieve. </p><

78、;p>　　Data interface connector box data connectivity through the data interface connector (1 C601), the central processing unit in the serial and individuals can maintain communications between computers. This will be

79、able to convert a set of test patterns, and can read and write, read-only memory and flash memory clean of data. </p><p>　　3, power management systems (1 C901) </p><p>　　Power from a 3.6 V, 550m

80、Ah lithium batteries, electricity from the power of the IC-level, including five individual V regulator, a 1.2 V regulator and a 3.3 V regulator, by controlling the terminal switch control . </p><p>　　RF sys

81、tems using the transmission system voltage 3.3 V; </p><p>　　Oscillator-driven work in the 1.2 V source voltage; </p><p>　　Buzzer and light-emitting diode circuits work in the 3.6 V voltage; <

82、/p><p>　　Power is part of the action through five regulator of 3 V voltage, including the logic unit, voice modules and RF modules, through various circuits distinction between the power supply unit, will be ab

83、le to inhibit interfere with each other. </p><p>　　PHS and from the use of mobile phones, both through the phone, through wireless digital wireless communications. However, characteristics of systems, "

84、mobile phone" located in Mobile, through a dedicated mobile switching network will link the service area, can provide users with provincial, national and global roaming service for frequent travelers or greater mobi

85、lity of staff Provide convenient. The PHS is a fixed location in the city to supplement and extend the telephone, mainly relying on fi</p><p>　　The control points are as follows: </p><p>　　First

86、, use and structure </p><p>　　1, both in the structure of a small, light weight arguments, easy to carry. </p><p>　　2, PHS because of the power consumption of small, continuous talk time than th

87、e mobile phone a long time and waiting time longer. </p><p>　　3, PHS low-cost, the implementation of the one-way charging, similar to the payment of fixed telephone costs in the enjoyment of mobile phone com

88、munication services. </p><p>　　4, PHS fixed line phone features a mobile phone features. </p><p>　　5, PHS phone for callers either side or the destination, the call is completed to click the but

89、ton hang up, otherwise just as fixed-line microphone built Chahuang not good, the phone will no longer be able to call. </p><p>　　6, PHS used a dial-up TDMA redial button, the redial button breath can be re-

90、issued. </p><p>　　Second, the system features in </p><p>　　1, because the two different location, access systems are very different, the mobile phone system by the wireless, PHS and PAS system i

91、s interrupted, links, carried out by Shihua Wang. </p><p>　　2, PHS system cloth micro-cellular network, base stations transmitting power is very small, net of cloth, when strong signal to other base stations

92、, mobile phones can automatically switch to another base stations, switching will have a brief pause the call, Mobile calls will appear one to two seconds short interruption, do not have to hang up automatically resume s

93、oon, mobile phones than it is inadequate. </p><p>　　3, the mobile phone system is the core mobile switching center (MSC) and the PHS system is the core base station controllers (RPC), there are similarities.

94、 </p><p>　　4, PAS modular system (VLSI), large capacity, ease of installation and low cost. It entered the city program-controlled telephone network cost savings. </p><p>　　5, PHS mobile phone a

95、nd two different communication systems, the use of mobile phones are completely different, so that the phone can not be fixed telephone network to portable telephone, PHS phones can not be the mobile phone network. </

96、p><p>　　Communication technology </p><p>　　1, PAS system is the wireless channel between the use of mobile phone base stations and multi-carrier frequency time division duplex mode (FDMA / TDD), TD

97、MA-based wireless channel structure, in many sub-band frequencies to achieve dynamic allocation to each base station 1 (frequency / time) channel. The base station channel utilization, save frequency resources. </p>

98、;<p>　　2, PAS system in the switching and mobile phone roaming both technically and in common has its own characteristics. PAS system of user data, authentication authentication database, the end result memory, gr

99、eatly simplifying access memory, thereby saving the system in hardware and software costs. </p><p>　　3, PAS system uses 1.9 GHz microwave band, so it's relatively poor penetration capability, plus the re

100、latively small power base stations, only 10 mw \ 200mw \ 500mw, so indoor signal coverage is rather poor, should call window or as close as possible to properly adjust the position. But PHS phone transmitting power very

101、small (only 10 mw) convergence is very small, only two mobile phone 1.0%, will not affect human health, it is "green communications," said. </p><p>　　4, PHS used JI/4QPSK 90 quadrature phase shift