CN201042007Y - Short distance radio frequency spreading communication system - Google Patents
Short distance radio frequency spreading communication system Download PDFInfo
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- CN201042007Y CN201042007Y CNU2005200469504U CN200520046950U CN201042007Y CN 201042007 Y CN201042007 Y CN 201042007Y CN U2005200469504 U CNU2005200469504 U CN U2005200469504U CN 200520046950 U CN200520046950 U CN 200520046950U CN 201042007 Y CN201042007 Y CN 201042007Y
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Abstract
The utility model relates to a short-distance wireless spread-spectrum communication system, and is characterized in that a short-distance wireless spread-spectrum communication system comprises an interface control unit used for realizing transmission and interaction of external MCU and internal control signals; a central control unit connecting with the interface control unit and controlling signals of a transmitter unit and a receiver unit; the transmitter unit connecting with the central control unit; the receiver unit connecting with the central control unit; a power control unit connecting with the central control unit and adjusting dynamically the system power; and a radio frequency control unit connecting with the central control unit and configuring time sequence of a radio frequency circuit and dynamically adjusting parameters of the internal register of the radio frequency circuit.
Description
Technical field
The utility model relates to a kind of short-distance wireless spread spectrum communication system, particularly a kind of reception of short-distance wireless spread spectrum communication system, dispensing device.
Background technology
Spread spectrum technique claims that again spread spectrum is the very fast a kind of technology of developed recently, uses it in the WLAN (wireless local area network), and every performance of system is improved, and has become indispensable a kind of technology in the WLAN (wireless local area network).It has not only given play to the advantage of not replacing in military communication, and has been penetrated into the various aspects of communication widely, as satellite communication, mobile communication, microwave communication, wireless location system, WLAN (wireless local area network), global personal communication etc.
Spread spectrum is exactly that the narrow band signal that will transmit is expanded to than on a lot of frequency band of former bandwidth, and its power spectral density is reduced greatly, and signal is submerged in the noise, at receiving terminal, with the method for correlation reception WBSR wideband signal recovery is become narrow band signal.To disturbing or other signal, because uncorrelated, in receiver, be stretched on the very wide frequency band, it is very little to make it the interference power that enters in the receiver pass-band, thereby curbs interference, accurate, safe finishes communication.
The theoretical foundation of spread spectrum communication is shannon formula significant in the communication theory, and it can be expressed as: C=BLog
2(1+S/N).In the formula: C is that channel capacity, unit are bits per second (bps), and it is the maximum data rate that allowed down of acceptable error rate (BER) in theory; B is the channel width of requirement, and unit is Hz; S/N is a signal to noise ratio.C represents the amount of information that communication channel allows, also represented the desired performance that obtains, bandwidth (B) then is the cost of paying, because frequency is a kind of Limited resources, and environment or physical characteristic (barrier, jammer, conflict etc.) around S/N represents.When being used for adverse circumstances when (noise and interference cause extremely low signal to noise ratio), as can be seen from the above equation: need to improve signal bandwidth (B) and keep or improve the performance of communication, the power of signal can be lower than noise floor even.Enlarge transmission bandwidth and can increase channel capacity, but enlarging transmission frequency bandwidth also can not make channel capacity infinitely increase.
Spread spectrum communication is compared with the general radio communication system, mainly is to have increased band spectrum modulation at transmitting terminal, and has increased the process of spread spectrum demodulation at receiving terminal.Utilize one group of speed the original signal sign indicating number to be carried out band spectrum modulation at transmitting terminal far above the Pseudo-Random Noise Code of signal rate, generally be with signal broadening to several million frequency band, then the information behind the spread spectrum is modulated on the carrier frequency of space transmission and sends.Utilize identical pseudo noise code to carry out despreading at receiving terminal, the signal energy that spreads out is drawn in from the broadband.Every broadband signal relevant with the pseudo noise code sign indicating number is reduced to original narrow band signal through demodulation, and other and the incoherent broadband noise of pseudo noise code sign indicating number are still kept the broadband.After the later narrow band signal of demodulation passes through narrow-band filtering again, isolate useful signal, signal to noise ratio is greatly improved, the error rate then reduces.
Compare with the arrowband technology of rule,, wasted limited frequency resource because spread spectrum takies wideer frequency band.Yet shared frequency band can be compensated by the same frequency band that has enlarged of multiple users share, and a plurality of users just can non-interferingly use same frequency for communication simultaneously, thereby realized channeling as long as the spread spectrum coding of oneself is used in pairing.
But existing short distance radio communication system sends and receives stable, insecure inadequately in data, and system power dissipation is big, cost is high.
The utility model content
The technical problems to be solved in the utility model provides the short-distance wireless spread spectrum communication system that a kind of energy is stable, transmit and receive data reliably.
The utility model is achieved through the following technical solutions: a kind of short-distance wireless spread spectrum communication system comprises:
Interface control unit is used to realize that the transmission of outside MCU and internal control signal is with mutual;
The central control unit that links to each other with interface control unit controls transmitter the signal of unit and receiver unit;
The transmitter unit that links to each other with central control unit;
The receiver unit that links to each other with central control unit;
The power control unit that links to each other with central control unit, the power of dynamic debugging system;
The radio frequency control unit that links to each other with central control unit is to the configuration and the dynamic parameter of adjusting the radio circuit internal register of radio circuit sequential.
Wherein, described transmitter unit comprises:
The frame that links to each other with central control unit is handled and the CRC check unit, is used to differentiate Frame and control frame;
The convolutional encoding unit that links to each other with frame processing unit;
The block interleaving unit that links to each other with the convolutional encoding unit;
The string and the converting unit that link to each other with the block interleaving unit, output two paths of data stream;
The coded signal added signal spectrum-spreading unit of two paths of data stream and pseudo-code generator; With
The forming filter of receiving spread frequency signal.
The coded signal of described pseudo-code generator is 63 Gold coded signals.
Described receiver unit comprises:
Be used to realize synchronous matched filter;
Select the Gold sign indicating number and receive the pseudo-code generator that the code stream addition realizes despreading;
The parallel serial conversion unit of signal after the two inputs inputs addition;
The deinterleaving unit that links to each other with parallel serial conversion unit;
The decoding unit that links to each other with the deinterleaving unit;
What link to each other with decoding unit, central control unit separates frame and CRC check unit; With
The synchronization module that links to each other with central control unit is controlled the synchronous of matched filter and pseudo-code generator.
The external radio frequency circuit links to each other with the radio frequency control unit.
The utility model is by the circuit design of baseband portion use FPGA, and direct and MCU carries out the transfer of data certificate, can stablize and finish reliably the data transmission and the reception of short-distance wireless indoor channel.Through field test, communication distance reaches 100 meters, and the error rate is lower than 10
-6
Description of drawings
Fig. 1 is the system block diagram of spread spectrum radio communications system;
Fig. 2 is the circuit block diagram of spread spectrum radio communications system;
Fig. 3 is the string and the converting unit system block diagram of spread spectrum radio communications system;
Fig. 4 is the Gold code generator schematic diagram of spread spectrum radio communications system.
Embodiment
In the design of the spread spectrum communication system of reality, and the versatility of considering chip convenient for later upgrading is with baseband portion and separately design of radio frequency part.See also Fig. 1, radio frequency part is used special radio frequency chip, the wide band radio-frequency chip MAX2820 series of the 2.4G frequency range of releasing such as MAXIM company.Baseband portion is used the circuit design of FPGA, and direct and MCU carries out the transfer of data certificate, and the transmission of data both can be carried out easily in user oriented like this PC interface, can also not consider the media of communicating by letter.
In the design of the FPGA of baseband portion, mainly finish the direct sequence spread spectrum processing capacity of baseband signal.Transmitter unit part has wherein mainly comprised convolutional encoding, block interleaving, PN spread spectrum and QPSK modulation etc.; The receiver unit part mainly comprises Digital Down Convert (demodulation), the PN sign indicating number is synchronous and parts such as despreading, automatic frequency control, deinterleaving and Viterbi decoding.
Seeing also Fig. 2, in spread spectrum radio communications system, at first is the initializing signal mcu_reset of chip.MCU one power on after, send out earlier the reset pulse mcu_reset signal of a certain width to the SOC chip.
The major function of interface control unit is to realize that the transmission of MCU and FPGA control signal is with mutual.Clk_mcu, en_mcu, data_mcu is imported by single-chip microcomputer, module output en_soc, data_soc, cts_soc is to single-chip microcomputer.The assignment of concrete signal is seen central control unit.
Central control unit is the core control section of this spread spectrum system, and signal controlling and the agreement mainly finished whole transmission and receiving system realize that concrete workflow is as follows:
1 when detecting mcu_reset and go up the effective pulse signal of level, and the SOC chip carries out initialization
(en_soc=1, data_soc=1, cts=0); And give radio-frequency head with the control word (PAC) of appointment.Finish initialization (EN_PA=0) to radio-frequency head.
2. after the initialization, the SOC chip is in idle condition, and Rx_EN is put height, and Tx_EN puts low, allows MCU to SOC chip photos and sending messages frame (be called MCU and send permission), also allows to monitor on channel (be called RF and receive permission).
3. have rising edge to trigger if detect en_mcu, turn off RF and receive and allow, Rx_EN is put low, under the guiding of clock clk_mcu, with the Data Receiving of data_mcu in a register.Fifo_full draws high when acceptance is graceful.At this moment, transfer transmit status to by idle condition.
1) if, then change frequency range control word (PAC), make radio-frequency head be operated in the frequency range of appointment for channel switches indication (cfg_come is high);
2), when detecting fifo_full and have rising edge to trigger, enter encrypting module, and then, simultaneously Tx_EN is drawn high through encode, interweave, after the band spectrum modulation, exporting baseband signal if be Frame or control frame.After having transmitted a frame, Tx_EN is put low, Rx_EN is put height.With end_send, csb_end, pow_end is a flag bit, goes back to idle condition by transmit status.
4. if detection module has detected signal and has received (end_ecode=1), turn off MCU and send permission, transfer accepting state to by idle condition.By synchronously, despreading, decoding, after the deciphering, receiving data frames is put in the register behind the full frame, sends this frame to MCU, opens MCU then and sends permission.With rec_send is flag bit, goes back to idle condition by accepting state.
Transmitter unit of the present invention comprises following unit module: frame is handled and the CRC check unit, is Frame if detect, and then getting frame length is 128 bytes; As be control frame, then get frame length 18 bytes.
The convolutional encoding unit, the main input data of coded portion comprise: clk is a system clock, and clk_data is a data clock, clock signal produces by spread spectrum module is unified, is produced by the master clock frequency division.Mcu_reset is the systematic reset signal from control module, is used for controlling enabling of coding.The Fifo_full signal is from control module, shows that to encoder control frame or Frame among the fifo pile, and can take away and carry out coding work.The Fifo_empty signal informs that equally from control module the data among the encoder fifo have been got.The Type_t signal is from control module, and what show current transmission is control frame or Frame.The End_send signal comes from spreading part spreads, shows that data send to finish, and can finish coding work.Above signal is control signal, encoded data signals be fifo_out this be one 8 bit parallel data, from control module, be the coded data source.
Whether encoder detects central control unit once powering on mcu_reset signal is high, if for whether the high fifo that detects central control unit writes full, completely begin reading of data and encode if write, there have not been data to have taken out up to the fifo_empty signal now for high expression, whether be high, for height then finishes coding if detecting end_encode during coding.Draw high en_dsss during coding and be the spreading part spreads of back and carry out work.
The inner first step of encoding, the fifo data collection of control module is informed encoder work by enable signal after having expired.Data enter coding module, carry out data and integrate in encode_input_part_all, and string changes.The input of input data integrator comprises clk_data, mcu_reset, fifo_full, the 8bit parallel data stream fifo_out that control signal such as fifo_emtpy and control module are carried, but and do not meet the requirement of rear end convolution coder, so done the parallel serial conversion of 8bit_to_1bit here, make the data fit requirement, be output as encode_in, produce the read signal feedback in addition and give control module, expression has begun to read fifo.En_encode exports to acoustic convolver, represents enabling of acoustic convolver.End_encode exports to acoustic convolver and represents to finish convolutional encoding.
Second step was carried out convolution respectively, and convoler is made up of two-stage encoder convoler_1 and convoler_2, and the convoler1 module makes the input data enter shift register, and the assurance computing is correctly carried out; The convoler2 module is calculated data.These two modules do not need to improve in improving from now on, only need the shift register quantity among the corresponding increase convoler1 and change the improvement that operational formula among the convoler2 can be finished encoder.
Block interleaving unit, this unit are right after coding module to carry out, and is input as the output sequence of coding.This process is mainly used the alternately read-write of two memory cell, finishes data and changes preface work; Therefore, data flow can realize resisting the channel burst The noise.The size of memory cell answers actual conditions to change, and also has influence on the performance of correcting burst error in the time of variation.The input signal of interleaver has comprised clk_data, mcu_reset, and con_out2 and con_valid2, output signal is 2bit data-signal encode_out and the 1bit control signal int_valid enable signal as subsequent module.
The output module of coding/interleaver is in order to eliminate the time-delay influence that block interleaver produces.Input signal has clk, clk_data, and mcu_reset, type_t, int_valid and end_send, output signal has endsss as the enable signal of spread spectrum end and the end_encode feedback signal as control end.
String and converting unit, input code flow are under clock clk_data effect, and odd bits is sent into I road formation data data_i_out, and even bit sends into Q road data_q_out, see also Fig. 3.
1235 of above-mentioned two-way code stream data frame lengths have added 300 bit synchronization heads respectively, and 63 the GOLD sign indicating numbers addition that produces with pseudo-code generator realizes spread spectrum then.
See also Fig. 4, the pseudo-code generator among the present invention produces 63 GOLD sign indicating numbers, by generator polynomial f1 (x)=1+x+x
6Generate.The clock clk_code of pseudo-code generator is 63 times of data clock, in the time period that data numeral passes through, has generated 63 GOLD sign indicating numbers in other words.Put at enable signal mcu_reset and to bring into operation in 0 o'clock, spread spectrum finishes back mcu_reset and puts 1 clear 0.
The clock frequency of the sequence behind the spread spectrum becomes original 63 times, and before entering shaping filter, carry out narrowing of signal earlier, makes it to be similar to impulse signal, is convenient to be shaped.Specifically be to make 1 to become 00010000,0 and become 000-10000, after this clock frequency becomes original 63*8 doubly.Do shaping by forming filter then.
Signal behind the spread spectrum is sent into forming filter.This filter has been selected the square root raised cosine filter that roll-offs, and adopts the design of question blank method, and 49 sample values of the baseband waveform after being shaped are stored.Signal chong_i_out after spread spectrum narrows and chong_q_out make convolution respectively with it, signal Tx_I and Tx_Q after obtaining being shaped, mixing output then.The clock signal clk_code_eight of forming filter is consistent with the frequency expansion sequence of input.When signal frame then, Enable Pin mcu_reset to 0, a frame signal be shaped to finish, mcu_reset to 1.
Output to digital to analog converter D/A through forming filter, send by wireless channel by radio circuit at last.
The power control frame by power control unit, is dynamically adjusted the power of whole system after handling through the frame of central control unit.
The configuration frame by the radio frequency control unit, is finished the configuration to the radio circuit sequential after handling through the frame of central control unit, adjusts the relevant parameter of the register of radio circuit inside dynamically.This three circuit-switched data stream has been finished the up link of native system basically.
Receiver unit of the present invention comprises following unit module:
At receiving terminal, realize synchronously that earlier so-called matched filter is through matched filter, the filter that is complementary with signal exactly, it in the middle of or disturbing at multiple signal come out an input that matches.For the video square pulse, passive matched filter is exactly that tapped delay line is added adder-accumulator, is sometimes referred to as transversal filter.
The GOLD sign indicating number addition that signal after the coupling generates with the receiving end pseudo-code generator under the control of synchronization module realizes despreading.
Synchronization module links to each other with central control unit other modules is controlled, and on the one hand, it can notify the type type_r of spread spectrum despreading module transmission signals, the latter thereby know with which and organize spreading code.On the other hand, the clock cycle of its control pseudo-code generator, be used for catching and following the tracks of synchronizing signal, 63 GOLD sign indicating number bendiA and received signal RX_I or RX_Q make inner product, and promptly multiply each other then must addition for correspondence position, make comparisons in thresholding, if do not get to thresholding, think then and do not catch synchronously that it moves one with regard to control stream clock clk_main1, continue to make comparisons, up to realizing synchronously.
The receiving terminal pseudo-code generator, consistent with transmitting terminal, enable signal buhuo puts 1 after synchronously, select one group of GOLD sign indicating number and receive code stream RX_I addition according to signal type type_r, obtain jiekuoA_out, finish despreading, then Enable Pin puts 0, waits for the next signal frame.
Parallel serial conversion unit, under clock clk_data effect, I, Q two paths of signals jiekuoA_out and jiekuoB_out insert the odd positions and the even number position of output respectively, form code stream decode_in to be decoded.
The deinterleaving unit mainly divides two parts, comprises deinterleaving and decoding.
The input signal of deinterleaving part comprises: clk_data is as work clock, mcu_reset is as system's enable signal, en_decode is as the work enable signal, what type_r represented current reception is Frame or control frame, decode_in is the 2bit data-signal, is the deal with data of decoded portion.Because interleaver and deinterleaver have adopted same structure and algorithm in this project, do not give unnecessary details here.
Decoding unit is input as the bit stream that deinterleaving is exported.Method adopts Viterbi decoding, and the dominant ideas of decoding are " Jia-ratios-choosing ", so the viterbi_distance module mainly is responsible for the work of " adding ", the viterbi module mainly is responsible for the work of " ratio-choosing ".The viterbi_distance module be used to calculate the sequence that receives and stored the code distance between might sequence, viterbi is used to carry out code distance and judges and accept or reject.Its output signal is the decode_out of 1bit, and this signal imports the work that central control unit is separated verification into, and another output signal decode_valid is the enable signal that central control unit is received, and informs that it begins to receive effective decoded data.
Separate frame and CRC check unit, be input as the data after decoding is exported, obtain final data through after separating verification.
Then data flow is returned to central control unit, decide receiving the processing of data flow by central control unit, and data necessary is returned to the upper strata by interface and control module.
From practical angle, native system is cast out unnecessary function based on the IEEE802.11b agreement, and the part that stays is streamlined any further, given prominence to this wireless communication chips at the major function of objective network, channel efficiency is higher.From the angle of exploitation, development efficiency is higher.
Claims (4)
1. a short-distance wireless spread spectrum communication system is characterized in that, comprises:
Interface control unit is used to realize that the transmission of outside MCU and internal control signal is with mutual;
The central control unit that links to each other with interface control unit controls transmitter the signal of unit and receiver unit:
The transmitter unit that links to each other with central control unit;
The receiver unit that links to each other with central control unit;
The power control unit that links to each other with central control unit, the power of dynamic debugging system;
The radio frequency control unit that links to each other with central control unit is to the configuration and the dynamic radio circuit internal register parameter of adjusting of radio circuit sequential.
2. a kind of short-distance wireless spread spectrum communication system as claimed in claim 1 is characterized in that described transmitter unit comprises:
The frame that links to each other with central control unit is handled and the CRC check unit, is used to differentiate Frame and control frame;
The convolutional encoding unit that links to each other with frame processing unit;
The block interleaving unit that links to each other with the convolutional encoding unit;
The string and the converting unit that link to each other with the block interleaving unit, output two paths of data stream;
The coded signal added signal spectrum-spreading unit of two paths of data stream and pseudo-code generator; With
The forming filter of receiving spread frequency signal.
3. a kind of short-distance wireless spread spectrum communication system as claimed in claim 1 is characterized in that described receiver unit comprises:
Be used to realize synchronous matched filter;
Select the Gold sign indicating number and receive the pseudo-code generator that the code stream addition realizes despreading;
The parallel serial conversion unit of signal after the two inputs inputs addition;
The deinterleaving unit that links to each other with parallel serial conversion unit;
The decoding unit that links to each other with the deinterleaving unit;
What link to each other with decoding unit, central control unit separates frame and CRC check unit; With
The synchronization module that links to each other with central control unit is controlled the synchronous of matched filter and pseudo-code generator.
4. a kind of short-distance wireless spread spectrum communication system as claimed in claim 1 is characterized in that the external radio frequency circuit links to each other with the radio frequency control unit.
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| CNU2005200469504U CN201042007Y (en) | 2005-11-25 | 2005-11-25 | Short distance radio frequency spreading communication system |
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| CNU2005200469504U CN201042007Y (en) | 2005-11-25 | 2005-11-25 | Short distance radio frequency spreading communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743535A (en) * | 2016-04-18 | 2016-07-06 | 四川九洲空管科技有限责任公司 | Anti-interference communication module for short wave radio station |
-
2005
- 2005-11-25 CN CNU2005200469504U patent/CN201042007Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743535A (en) * | 2016-04-18 | 2016-07-06 | 四川九洲空管科技有限责任公司 | Anti-interference communication module for short wave radio station |
| CN105743535B (en) * | 2016-04-18 | 2018-05-15 | 四川九洲空管科技有限责任公司 | A kind of antijam communication module for short-wave radio set |
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