CN201742566U - Multipoint set net type data system - Google Patents
Multipoint set net type data system Download PDFInfo
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- CN201742566U CN201742566U CN2009202932429U CN200920293242U CN201742566U CN 201742566 U CN201742566 U CN 201742566U CN 2009202932429 U CN2009202932429 U CN 2009202932429U CN 200920293242 U CN200920293242 U CN 200920293242U CN 201742566 U CN201742566 U CN 201742566U
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Abstract
The utility model provides a multipoint set net type data system and solves the problems that the traditional wireless system cannot simultaneously emit a plurality of data in a same set and a handset cannot simultaneously monitor multipath. In the utility model, a moveable subsystem is added based on a rapid access system and the moveable subsystem is connected to a data terminal of the rapid access system in order to simultaneously access nine mobile handsets in one station, therefore increasing the communication capability and the operation scope of the original system and promoting the flexibility, motility and comprehensive detecting capability of the original system.
Description
Technical field
The utility model relates to a kind of multiple spot networking formula data system.
Background technology
Can realize the wireless system of voice-and-data transmission at present, as gsm communication, cdma communication, 3G communication, data cluster communication etc., these systems are comparative maturity all, the technology that adopts is also very advanced, there are problems such as cost height, volume are big, equipment complexity in the utility model but be applied directly to, are difficult to satisfy specific user's demand.
Immediate with utility model is the TETRA digital cluster system, but there is following defective in the TETRA digital cluster system: 1, adopt the frequency division multiple access system, communication is collision detection (CSMA) mechanism between many of same frequency, do not make full use of two kinds of communication systems of frequency division multiple access and time division multiple access, do not reach the requirement that communication is at any time communicated by letter simultaneously with one-to-many between the group Nei Duotai; 2, powerful, but the antenna height of power consumption, volume, weight and the antenna of base station equipment is had certain requirement, the travelling performance of base station is poor, can not satisfy special mobile communication to the ambulant requirement of system; 3, be command dispatching system, in the requirement that can not satisfy special purpose aspect the anti-interference and anti-intercepting and capturing of message transmission; 4, when a plurality of users of processing insert, be PTT control or collision detection mechanism artificially, can only have one on same time, the same frequency in emission, other are in accepting state, the a plurality of emission arranged in can not satisfying on the same group simultaneously, and a hand-held set can be monitored the requirement of multichannel simultaneously.
Summary of the invention
The utility model provides a kind of multiple spot networking formula the anti-Simultaneous Voice and Data Terminals of intercepting and capturing, and this terminal comprises main platform, is connected with main platform.
The technical scheme that realizes the utility model purpose is:
Multiple spot networking formula data system comprises central station, belongs to platform, it is characterized by also to comprise the mover system and be connected mover system and the data terminal that belongs to platform, and wherein the mover system comprises mobile base station and mobile handset.
The mobile base station is 9.
Each mobile base station connects 1-10 mobile handset.
Mobile base station and mobile handset include transmitting information wirelessly terminal and PDA, wherein the transmitting information wirelessly terminal of mobile base station comprises mainboard, Base Band Unit, radio frequency unit, power supply unit and antenna, and the transmitting information wirelessly terminal of mobile handset comprises mainboard, Base Band Unit, radio frequency unit, power supply unit and antenna; Base Band Unit comprises control module, network communication module, radio-frequency module, sending module and receiver module; Radio frequency unit comprises low noise amplifier (LAN) unit, power amplifier (power amplifier) unit, converter unit, modulating unit, demodulating unit and local oscillator unit; Network communication module comprises MAC-R, MAC-T, ARP, IP-Rec, IP-Send, UDP-Rec and UDP-Send.
The beneficial effects of the utility model are:
1, each genus platform of the utility model can insert 9 mobile handsets simultaneously, has enlarged the communication capacity and the job area of original system, has improved mobility, flexibility and the comprehensive reconnaissance capability of original system.
2, adopt centrally connected power supply and rational resource allocation to reduce volume and weight, simultaneously in the design of agreement, make full use of resource, under the system of assurance normal operation, reduce power emission, reduce the power consumption of unit, characteristics such as mobile base station and mobile handset have that volume is little, in light weight, power consumption is little, anti-interference, maneuverability are easy to carry and work long hours.
3, adopt the frequency division system, avoided between the mobile base station, between the mobile handset, phase mutual interference between mobile base station and the mobile handset, use different frequent points between the mover system.
4, the time-division system is adopted in the communication of mover system for content, is convenient to manage the unification with equipment.
5, on channel, adopt the antijam communication technology, reduce the spectrum density of signal transmission, on information source, adopt reliable encryption technology simultaneously, guarantee that voice, message and navigation information are not stolen.
6, be the timely transmission of in limited frequency range, satisfying double-directional speech, message and navigation information between 9 mobile handsets, adopt the multi-system spread spectrum to improve the efficient of frequency spectrum transmission, and on information source, adopt improved G729 speech coding technology and several data source integration technology, reduce the speed of transfer of data.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the structural representation of mobile base station
Fig. 3 is the Base Band Unit structural representation
Fig. 4 is the network communication module structural representation
Fig. 5 is the radio frequency unit structural representation
Fig. 6 is the power supply unit structural representation
Fig. 7 is a TDD/TDMA frame structure schematic diagram
Fig. 8 is the subframe structure schematic diagram
Fig. 9 is the structural representation of mainboard
Figure 10 is the voice signal process chart
Figure 11 is the schematic diagram of coding spread spectrum
Figure 12 is that despreading/demodulation realizes block diagram
Figure 13 realizes block diagram for the RS coding
Figure 14 realizes block diagram for the RS decoding
Figure 15 is the implementation structure figure of forming filter
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1, multiple spot networking formula data system comprises central station, belongs to platform, it is characterized by also to comprise the mover system and be connected mover system and the data terminal that belongs to platform by USB interface, and wherein the mover system comprises mobile base station and mobile handset.Wherein central station and genus platform constitute the system that is open to traffic soon.
As shown in Figure 2, the mobile base station is made up of transmitting information wirelessly terminal and PDA.Two-way this locality (employing USB interface) fast data exchange can be carried out with the data terminal that belongs to platform that is open to traffic soon in the mobile base station, can carry out data and speech transmissions with mobile handset again.
PDA: carry out data interaction by bluetooth or RS232 interface and transmitting information wirelessly terminal; Gather GPS locating information, pictorial information and transmission commander information, message information; Carry out the editor of free newspaper, format message and icon, geography information; Realize functions such as message editing, storage, backup, forwarding, inquiry, daily record.
The transmitting information wirelessly terminal is made up of mainboard, Base Band Unit, radio frequency unit, power supply unit and antenna.
Mainboard: mainly finish collection, the playback of voice signal, G.729 encoding and decoding speech is realized 1 road coding, 9 tunnel decodings; Carry out format conversion, the encapsulation of data, voice messaging; Carry out data interaction by bluetooth or RS232 interface and PDA unit; Carry out data interaction by Ethernet interface and Base Band Unit; Carry out data interaction by serial interface and data terminal.
Base Band Unit: receive the data that mainboard sends by Ethernet interface, carry out forming baseband signal after chnnel coding, framing, spread spectrum, the shaping, send by radio frequency unit; The signal that radio frequency unit is received carries out despreading/demodulation, separates frame, channel-decoding, sends the data to mainboard by Ethernet interface; The TDD/TDMA agreement timing controlled of realization system; Radio frequency unit transmitting-receiving control; Indication signal such as synchronously.
Radio frequency unit: finish baseband signal up-conversion, power amplification, pass through antenna transmission; The signal that antenna is received amplifies, down-converted, delivers to Base Band Unit.
Power supply unit: cell voltage is converted to rated voltage, for mainboard, Base Band Unit, radio frequency unit and encryption equipment provide reliable and stable direct current supply; Detect battery electric quantity, when electric weight is not enough, provide indication.
Mobile handset is made up of transmitting information wirelessly terminal and PDA.Mobile handset carries out data and speech transmissions with the mobile base station.
The transmitting information wirelessly terminal is made up of mainboard, Base Band Unit, radio frequency unit, power supply unit and antenna.
Mainboard: mainly finish collection, the playback of voice signal, G.729 encoding and decoding speech is realized 1 road coding, 9 tunnel decodings: carry out format conversion, the encapsulation of data, voice messaging; Carry out data interaction by bluetooth or RS232 interface and PDA unit; Carry out data interaction by Ethernet interface and Base Band Unit.
Base Band Unit: receive the data that mainboard sends by Ethernet interface, carry out forming baseband signal after chnnel coding, framing, spread spectrum, the shaping, send by radio frequency unit; The signal that radio frequency unit is received carries out despreading/demodulation, separates frame, channel-decoding, sends the data to mainboard by Ethernet interface; The TDD/TDMA agreement timing controlled of realization system; Radio frequency unit transmitting-receiving control; Synchronous indicating signal shows.
Radio frequency unit: finish baseband signal up-conversion, power amplification, pass through antenna transmission; The signal that antenna is received amplifies, down-converted, delivers to Base Band Unit.
Power supply unit: cell voltage is converted to rated voltage, for mainboard, Base Band Unit, radio frequency unit and encryption equipment provide reliable and stable direct current supply; Detect battery electric quantity, when electric weight is not enough, provide indication.
As shown in Figure 3, Base Band Unit comprises control module, network communication module, radio-frequency module, sending module and receiver module.Base Band Unit receives the data that mainboard sends by Ethernet interface, carries out forming baseband signal after chnnel coding, framing, spread spectrum, the shaping, sends by radio frequency unit; The signal that radio frequency unit is received carries out despreading/demodulation, separates frame, channel-decoding, sends the data to mainboard by Ethernet interface.
The Base Band Unit control module:
The initialization of peripheral components and each module of Base Band Unit;
System TDD/TDMA timing controlled;
Each module work schedule control of system;
Panel indication control.
Network communication module:
Receive mainboard through the Ethernet data bag that crypto sends, valid data load is delivered to sending module;
The data that receiver module is received send to mainboard by Ethernet through crypto.
Radio frequency control module:
Require the transmit-receive switch of control radio frequency unit according to the sequential of communication protocol design.
Sending module:
Chnnel coding: the data that send are carried out chnnel coding;
Framing: information such as the data after the chnnel coding and lead code, frame head are required to form the base band data frame according to frame structure;
Coding spread spectrum: the base band data frame is carried out coding spread spectrum handle, form I, Q two-way spread spectrum data;
Shaping filter: the compressed signal frequency band, suppress the signal secondary lobe;
D/A: the data transaction after will being shaped becomes Simulation with I, Q signal output.
Receiver module:
A/D: I, Q signal to radio frequency output are sampled, and become digital signal output;
Despreading/demodulation: I, Q data are carried out despreading/demodulation process, the output base band data;
Separate frame: the valid data in the base band data frame are taken out;
Channel-decoding: finish the error correction decoding that receives data.
As shown in Figure 4, network communication module comprises MAC-R, MAC-T, ARP, IP-Rec, IP-Send, UDP-Rec and UDP-Send.
Network communication module receives mainboard through the Ethernet data bag that crypto sends, and valid data load is delivered to sending module; The data that receiver module is received send to mainboard by Ethernet through crypto.
For realizing having designed network protocol stack with network communicating function.Owing to only used simple UDP message bag to carry out this locality communication in the system, for simplified system designs, reduce resource consumption, only keep necessary ARP, IP and udp protocol processing module, and also done simplification on each functions of modules.
MAC_R: judge it is ARP request or IP bag after receiving data, give the upper strata respectively, and with source MAC and source IP address to giving ARP.
MAC_T: send the corresponding data bag to network card chip according to IP or ARP request.
ARP: respond effective ARP request; According to the request of IP layer, initiate the ARP request, safeguard ARP Cache tabulation.
IP_Rec: receive the IP data, be sent to UDP according to protocol type.For destination address is not the data packet discarding of this machine, does not support route, does not support burst, does not support UDP upper-layer protocol data in addition.
IP_Send: send the UDP message bag, do not support UDP upper-layer protocol data in addition, do not support burst, do not support loopback.
UDP_Rec: receive the UDP message bag, data content is submitted to the upper strata.
UDP_Send: upper layer data is packaged into UDP sends.
As shown in Figure 5, radio frequency unit comprises LAN unit, power amplifier unit, converter unit, modulating unit, demodulating unit and local oscillator unit.
Receive path mainly comprises three parts, antenna filter and T/R part (at transmitter unit), low noise down-converter unit, demodulating unit.
Transmission channel comprises the I/Q modulator, upconverter, and power amplifier, unit such as T/R switch and power control are formed.
Power amplifier comprises radio-frequency filter, power amplifier and T/R switch.
As shown in Figure 6, power supply unit is converted to rated voltage with cell voltage, for mainboard, Base Band Unit, radio frequency unit and encryption equipment provide reliable and stable direct current supply; Detect battery electric quantity, when electric weight is not enough, provide indication.
Comprise parts such as short-circuit protection, 10V conversion, 5V conversion, 5V-3.3V conversion, 5V-1.2V change-over circuit; can realize one road 10V output, one road 5V output, three road 3.3V output and one road 1.2V output; has higher thermal adaptability; frequency stability preferably; high conversion rate, higher output accuracy and lower power consumption, and have short-circuit protection function.
Each mobile base station of native system and 9 mobile handsets are formed the hub-and-spoke network topology structure.Each subsystem may be overlapped on room and time, for avoid between the mobile base station, between the mobile handset, phase mutual interference between mobile base station and the mobile handset, use different frequent points between the mover system, adopt the frequency division system; The time-division system is adopted in the communication of subsystem content, is convenient to manage the unification with equipment.
The radio communication system of native system is:
Communication mode between mobile base station and the mobile handset is that a kind of typical point-to-multipoint inserts system, in this system/downstream rate is asymmetric, and higher uplink bit rate is 9*Rkbps (every road Rkbps), and downlink transmission data rate is Rkbps.In order to improve the utilance of channel spectrum, should adopt the TDMA/TDD wireless access way, descending employing TDM broadcast transmitted mode; Up employing TDMA access mode.Adopt time division duplex (TDD) between up link and the down link.The characteristics of this scheme are:
(1) reception and emission only take a carrier frequency, and system configuration is simple, equipment cost is low, and volume is little;
(2) be suitable for/application of the asymmetric transmission of downlink data, improve the availability of frequency spectrum of system;
(3) technology maturation, extensibility is good, is beneficial to the upgrading of system.
Unimpeded for the communication that guarantees each mobile handset, reduce data transfer delay, adopt fixedly preassignment mode of wireless channel here, promptly each hand-held set terminal all has unique physical channel corresponding with it.When sending data, the mobile base station do not have the problem of channel competition at it.The problem that when heavy traffic, does not also exist channel utilization to descend.
Under the TDD time division duplex, transmitting and receiving of equipment is operated in same rf frequency.Transmitting and receiving of each equipment is operated in the different time, and receiving branch was closed when promptly equipment was in emission state; Its transmitting branch was closed when equipment was in accepting state.And receive and emission between remain with enough guard times and make the two can not occur simultaneously.
The frame structure of native system is:
The TDD/TDMA frame structure that system is transmitted in physical channel as shown in Figure 7, " ↓ " and " ↑ " expression down channel and up channel among the figure.
TS0 is the transmission time slot of mobile base station, i.e. the downlink broadcast channel; TS1 to TS9 is the transmission time slot of mobile handset, i.e. up channel.Time slot TS1 to TS9 is the preassignment channel, and they are distributed to 9 mobile handsets regularly.
The subframe structure of each time slot as shown in Figure 8, among the figure:
The A guidance code---being used for AGC, to adjust expense, despreading, demodulation synchronous;
The B frame head---the frame alignment symbol is used for frame synchronization;
C sends ID---transmitter station address;
D receives ID---destination address;
E frame length---frame length is a unit with the byte;
F keeps---keeps;
G verification---frame check;
H information---through the information data behind the coding;
I protection---no valid data are used for avoiding the radiofrequency signal collision of system's individual device.
After basic tdma frame and subframe structure are determined, also need H (information) and I (protection) field length in definite subframe, and then determine the whole tdma frame cycle.
System adopts G.729 speech coding technology; the speech data speed at each outer station is 8Kbit/s; the total data rate at base station and outer station is 80Kbit/s; consider the expense such as encapsulation of vocoded data and the overheads such as frame head, verification, chnnel coding and protection in the tdma frame structure, the base band data speed that system is total is defined as 128Kbit/s.
(1) guard time at interval
Need the certain protection time interval between each time slot, purpose is to prevent that postamble and frame head between the two adjacent stations of time slot from clashing in receiving station.Its size needs to consider following factor:
The maximum coverage range of mobile base station, influencing factor mainly are electromagnetic transmission time delay and Data Receiving processing delay;
T/R switching time, influencing factor mainly is the switching time and the circuit design of RF device.
The native system maximum communication distance is 5Km, and T＞(2 * 5000)/(3 * 10 are then arranged
8)=3.3 * 10
-6Second=33us.
By the radio frequency unit index as can be known, the T/R conversion is less than 70us.
The guard time interval T
GShould be about 100us, be equivalent to the 12.8bit base band data,, get I field length N=16bit for leaving surplus and making things convenient for framing to realize.
(2) frame period and information field length
The data of information field after for coding have comprised the encapsulation overhead and the chnnel coding expense of vocoded data, the encapsulation overhead 8-10% of speech data wherein, chnnel coding expense 18-20%.
If each subframe lengths is the P millisecond, then the data volume of each subframe is 128*Pbit.
A-G in the subframe and I field length are 120bit.
The length of H field is 8*10*P/92%/82%bit.
120+ (8*10*P/92%/82%)=128*P then should be arranged.
Can get subframe lengths P greater than 5.5ms, the H field length is greater than 584bit.
Take all factors into consideration and leave that surplus, H field should be the integer byte and system realizes factors such as convenient, through adjusting, finally design subframe lengths P=6.4ms, the tdma frame cycle is 64ms.H field total length M=688bit (86 byte) adopts RS (70,86 coding), and the chnnel coding expense is about 18.6%, speech data expense 8.6%.
The major function of system board (as shown in Figure 9) is management and each unit co-ordination of control, and concrete unit comprises: exterior I O, USB unit, voice collecting and broadcast unit, data interaction unit etc.
Mainly finish work such as system's control, information gathering, data fusion and data interaction.Main function is as follows:
(1) system workflow process control
This part work is mainly being used mainboard module as a general small-size computer system, finish the control of initialization, interrupt configuration and response, each interface sequence and the agreement of system.
(2) voice signal is handled and G.729 encoding and decoding
System can realize the collection and the playback of 16 PCM voice signals, and realizes the G.729 voice coding/decoding algorithms and the silence detection algorithm of real-time high-efficiency, the requirement of the real-time voice communication in realization system one roadbed station and nine road outer stations.
(3) data processing and fusion
System can receive audio-frequency information and GPS information, and handles on request; Simultaneously, system can carry out data interaction with other common interfaces, and finishes the conversion and the data fusion function of data protocol on request.
(4) data interaction function
System can finish the data interaction with wireless module, can carry out data encapsulation on request; System can be by USB interface, that Ethernet interface carries out local data is mutual.
The topmost function of system is to realize the real-time voice communication in a roadbed station and nine road outer stations, handling process and software implement scheme in this selective analysis system to voice signal.Figure 10 is the voice signal handling process.
A/D and D/A conversion links adopt UCB1400 dedicated voice process chip, and this chip is supported the pcm encoder of multiple baud rate, and be low in energy consumption, sound effect good, is that present stage is at one of most widely used speech chip in PDA field;
The speech signal collection link mainly is according to the G.729 requirement of coding, presses 16 PCM voice signals of rate samples of 8kbps; Playing link is that decoded audio digital signals is play in real time, changes the analog signal that adult's ear can be discerned through D/A;
G.729 speech coding and decoding link sampled I TU canonical algorithm according to the concrete application and the requirement of system, carry out algorithm optimization and modification, finally reach the requirement of the real-time voice communication in a roadbed station and nine road outer stations;
Coding parameter encapsulation and network sending link are the links that designs at the concrete application of system, and its major function is speech parameter to be packaged into the fixedly data of frame length, and to send by wireless module at fixed time; Coding parameter is accepted and the decapsulation link is in the fixing moment, accepts the speech parameter data that wireless module sends, and the resolution data frame structure, transfers to the decoding link and handles.
Requirement for the real-time voice communication in realization system one roadbed station and nine road outer stations, the software of system voice processing links is write based on Linux multi-process technology, in conjunction with means such as Linux pipe technology, process communications, realize real-time one the tunnel encode nine the tunnel decoding system applies.
The QPSK modulation system is used in system design, using length is that 128 pseudo-code is carried out spread spectrum, if use common direct sequence spread spectrum mode, the spreading rate that produces will reach (128K/2) * 128=8.192MChip/s, signal bandwidth after the shaping is 8.192MHz, the bandwidth of 16.384MHz will be taken after the modulation, the system bandwidth index request can not be satisfied.Therefore consider to use the multi-system spread spectrum scheme.
The multi-system spread spectrum is called coding spread spectrum technology/tamed spread spectrum technology again, it is a kind of spread spectrum that development in recent years is very fast, application is more, mainly be that to be applied to those frequency bands limited and data transfer rate requires in the higher communication system, as burst communication, Computer Wireless Communication, mobile communication, tdma communication, cdma communication, wireless LAN communication etc.The coding spread spectrum technology is derived from direct sequence spread spectrum, different with the direct sequence spread spectrum method, coding spread spectrum is actual to be to adopt Methods for Coding to finish the expansion of frequency, its information adopts multi-system to represent, in the corresponding one group of pseudo noise code of each information symbol one is to realize the modulation of spread-spectrum and information.Its essence is that a kind of (N, k) coding are to be that the pseudo noise code of N is gone the k position information of indicating to transmit with length.Different with general directly-enlarging system, its spreading gain is smaller, and can not be integer; Information code is directly transmission not, and transmission is the code of information code---pseudo noise code.K position information has M (M=2
k) individual state, therefore need with M bar pseudo noise code corresponding with M state of k position information.In the application of reality, requiring this M bar length is quadrature for the pseudo noise code of N., speed one timing certain in frequency expansion sequence length that the coding spread spectrum technology has can be transmitted more information; And the advantage that amount of information is certain, pseudo-code sequence speed is certain, the spread processing gain is higher, antijamming capability is stronger.To the cycle be the N/k coding spread spectrum of T, the transmittability of the non-spread spectrum coding of its data transmissions force rate has increased log
2N times, and required bandwidth has descended
Doubly.
Native system uses 16 scale coding spread spectrum schemes, frequency expansion sequence length 128.
(1) coding spread spectrum is realized
M-ary orthogonal spread spectrum despread-and-demodulation mainly contains two kinds of methods.With QPSK is example, and a kind of method is that the I/Q two-way is spread spectrum simultaneously with one group of symbol that forms a M system of the every Nbit of binary data sequence of serial input.If receiving terminal uses relevant despreading/demodulation, need complicated carrier synchronization circuit, suppose that capture circuit uses the digital matched filter prize law, then need 2M matched filter, need 2M code tracking loop; If use incoherent despreading/demodulation then need 4M matched filter, system resources consumption is very big.Another kind method is that the I/Q two-way is transmitted synchronizing signal and data-signal respectively, and promptly fixing sign indicating number sequence is transmitted on the I road, and as synchronizing signal, an output is selected according to the difference of symbol in the Q road from frequency expansion sequence.This method is carried out acquisition and tracking and just can be realized that spreading code synchronously and sign synchronization at the receiving terminal signal that only need satisfy the need.Only need 2 matched filters and 1 code tracking loop and 16 integrators when using incoherent despread-and-demodulation, the hardware resource expense is less.
Take all factors into consideration system design index request and hard-wired resource overhead, system uses 16 system spread spectrum modes, be about to one group of symbol that forms one 16 system of the every 4bit of binary data sequence of serial input, the corresponding specific 128bit frequency expansion sequence of each symbol, modulation back busy channel bandwidth 8.192MHz.Compliance with system is to the requirement of bandwidth.
The schematic diagram of coding spread spectrum as shown in figure 11.
Figure 12 is that despreading/demodulation realizes block diagram, and the phase place of I road pseudo-code and Q road pseudo-code phase have fixing corresponding relation, and it is synchronous only need to catch, follow the tracks of the pseudo-code that just can realize the Q road to the I circuit-switched data at receiving terminal.The despreading of be correlated with of 16 correlators is used on the Q road, select the correlation maximum a road as the output result, promptly finished the demodulation of data, through and string export after changing.
System has adopted the channel coding schemes of RS (70,86) coding as data message, is to shorten gained, its primitive polynomial F (x)=1+X by RS (239,255) coding
2+ X
3+ X
4+ X
8
(1) realization of RS coding
The major part of coding circuit is one group of linear feedback shift register, Galois field multiplier, finite field adder, switch and selector, as shown in figure 13.
(2) the RS decoding realizes
The RS decoding circuit is made up of modules such as syndrome computations, BM iteration, Chien search, error value calculating, code element correction and symbol register, and it realizes block diagram as shown in figure 14.
System design forming filter reduce the influence of intersymbol interference and effectively reduce out-of-band radiation.Forming filter has adopted square root raised cosine filter, and its time-domain response is:
R is a rolloff-factor.
Forming filter has adopted 32 rank FIR filters of heterogeneous structure, and its implementation structure as shown in figure 15.
This filter has made full use of the symmetry and the stationarity of coefficient, and the characteristic of input code sequence, possible output result calculated store among the ROM, with the input the sign indicating number sequence as the high address, form low order address according to sampling number, control the content that to visit among the ROM by address switchover, form filtering output.This structure has effectively reduced the system hardware resources expense.
Native system can be realized following function:
(1) speech transmissions
Speech is the compressed digital speech of 8kbit/s, and up have 9 digital voice channels, 1 broadcast channel of following behavior.Up speech is alternative to be monitored or all monitors, and down voice can be realized program request, multicast and broadcasting.
(2) transfer of data
Data are mainly up GPS locating information, pictorial information, message information and descending commander's information.Transfer of data takies voice channel, high priority data.Upstream data is given mobile base station data terminal by the address and is handled, stores and show, downlink data is distributed to different mobile handsets.Because following behavior broadcast channel, the downlink data of different hand-held set different contents can only be transmitted in timesharing; The data of identical content can realize program request, multicast and broadcasting.
(3) GPS location
Mobile handset possesses the GPS positioning function, can be sent to mobile base station data terminal to GPS locating information or revised GPS locating information by demand.Mobile base station data terminal is equipped with electronic chart, can show the spot position on electronic chart, and can generate location newspaper storage or send to the genus platform that is open to traffic soon.
(4) navigation
According to mobile base station GIS-Geographic Information System situation the scout is realized scouting commander, be mainly the speech commander.
(5) graph-text identification
The pictorial information of system transmissions and thing mark information, geography information can form graph-text identification on the data terminal of mobile base station, and can store or be transmitted to the system that is open to traffic soon and belong to platform.
(6) message editing
The editting function of free newspaper, format message and icon, geography information can be carried out in the mobile base station, can store, revises, increases, operation such as deletion.To the icon of mobile handset, because system resource is limited, do storage in advance, can carry out message editing.
(7) emergency command
When the system mobile base station was destroyed or broken down, system carried out emergency command by a remote terminal, finished and scouted commander or withdraw task.
(8) electronic chart
Mobile base station data terminal is installed electronic map system, receives the remote terminal data and forms the information situation map.Mobile handset is unworthy of electronic chart.
(9) management function
Frequency demonstration, power management, the channel management of mobile system can be realized, message editing, storage, backup, forwarding, inquiry, daily record etc. can be realized.
(10) functions of the equipments show
Mobile base station and mobile handset apparatus all have power supply, line under-voltage, function such as synchronous shows, are convenient to commander or scout operation.
(11) automated power control
Mobile base station and mobile handset radio frequency unit can carry out adaptive control to transmitting power.
(12) Chinese character input
Mobile base station data terminal provides handwriting input, phonetic input, five input method of Chinese character such as input.Mobile handset is because resource-constrained provides hand-written or the soft keyboard input.
(13) system encryption
System adopts the soft encryption mode to carry out speech and data encryption.Reserve information source hardware encryption interface.
The workflow of native system is:
(1) the transmitting terminal voice signal transfer to after the collection of transmitting information wirelessly terminal, coding, encryption that receiving terminal transmitting information wirelessly terminal is decrypted, decoding and playback.
(2) PDA of mobile handset is transferred to the transmitting information wirelessly terminal with information such as gps data, messages by bluetooth or RS232 interface, be sent to the transmitting information wirelessly terminal of mobile base station through wireless channel, and through bluetooth or the RS232 interface is transferred to PDA or data terminal shows processing.
(3) PDA of mobile base station or the data terminal information of will commanding is transferred to the transmitting information wirelessly terminal by bluetooth or RS232 interface, be sent to the transmitting information wirelessly terminal of mobile handset through wireless channel, and be transferred to PDA through bluetooth or RS232 interface and show processing.
Claims (10)
1. multiple spot networking formula data system comprises central station, belongs to platform, it is characterized by also to comprise the mover system and be connected mover system and the data terminal that belongs to platform, and wherein the mover system comprises mobile base station and mobile handset.
2. multiple spot networking formula data system according to claim 1 is characterized by the mobile base station and comprises transmitting information wirelessly terminal and PDA.
3. multiple spot networking formula data system according to claim 1 is characterized by mobile handset and comprises transmitting information wirelessly terminal and PDA.
4. multiple spot networking formula data system according to claim 2 is characterized by the transmitting information wirelessly terminal and comprises mainboard, Base Band Unit, radio frequency unit, power supply unit and antenna.
5. multiple spot networking formula data system according to claim 3 is characterized by the transmitting information wirelessly terminal and comprises mainboard, Base Band Unit, radio frequency unit, power supply unit and antenna.
6. according to claim 4 or 5 described multiple spot networking formula data systems, it is characterized by Base Band Unit and comprise control module, network communication module, radio-frequency module, sending module and receiver module.
7. multiple spot networking formula data system according to claim 6 is characterized by radio frequency unit and comprises LAN unit, power amplifier unit, converter unit, modulating unit, demodulating unit and local oscillator unit.
8. multiple spot networking formula data system according to claim 7 is characterized by network communication module and comprises MAC-R, MAC-T, ARP, IP-Rec, IP-Send, UDP-Rec and UDP-Send.
9. multiple spot networking formula data system according to claim 8, it is characterized by the mover system is 9.
10. multiple spot networking formula data system according to claim 9 is characterized by each mobile base station and connects 1-10 mobile handset.
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| CN2009202932429U CN201742566U (en) | 2009-12-14 | 2009-12-14 | Multipoint set net type data system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202932429U CN201742566U (en) | 2009-12-14 | 2009-12-14 | Multipoint set net type data system |
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| CN201742566U true CN201742566U (en) | 2011-02-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795495A (en) * | 2013-12-30 | 2014-05-14 | 天津航天中为数据系统科技有限公司 | Asymmetric communication method and device |
| CN104992711A (en) * | 2015-05-27 | 2015-10-21 | 东南大学 | Local area network cluster duplexing speech communication method based on mobile terminal |
| CN106549704A (en) * | 2016-11-03 | 2017-03-29 | 青岛海信移动通信技术股份有限公司 | A kind of mobile terminal emergency communication device and mobile terminal |
| CN109039371A (en) * | 2018-09-21 | 2018-12-18 | 中山云海网络科技有限公司 | Ferris wheel and its microwave transmission system, microwave transmission unit |
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2009
- 2009-12-14 CN CN2009202932429U patent/CN201742566U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795495A (en) * | 2013-12-30 | 2014-05-14 | 天津航天中为数据系统科技有限公司 | Asymmetric communication method and device |
| CN103795495B (en) * | 2013-12-30 | 2017-10-10 | 天津航天中为数据系统科技有限公司 | Asymmetric communication method and device |
| CN104992711A (en) * | 2015-05-27 | 2015-10-21 | 东南大学 | Local area network cluster duplexing speech communication method based on mobile terminal |
| CN104992711B (en) * | 2015-05-27 | 2018-06-15 | 东南大学 | A kind of LAN cluster duplex voice communication method based on mobile terminal |
| CN106549704A (en) * | 2016-11-03 | 2017-03-29 | 青岛海信移动通信技术股份有限公司 | A kind of mobile terminal emergency communication device and mobile terminal |
| CN106549704B (en) * | 2016-11-03 | 2020-04-10 | 青岛海信移动通信技术股份有限公司 | Mobile terminal emergency communication device and mobile terminal |
| CN109039371A (en) * | 2018-09-21 | 2018-12-18 | 中山云海网络科技有限公司 | Ferris wheel and its microwave transmission system, microwave transmission unit |
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