CN102025479B - Sample point interweaving multi-path discrete signal time division multiplexing method - Google Patents
Sample point interweaving multi-path discrete signal time division multiplexing method Download PDFInfo
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- CN102025479B CN102025479B CN 200910023980 CN200910023980A CN102025479B CN 102025479 B CN102025479 B CN 102025479B CN 200910023980 CN200910023980 CN 200910023980 CN 200910023980 A CN200910023980 A CN 200910023980A CN 102025479 B CN102025479 B CN 102025479B
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Abstract
The invention discloses a spectrum spread-based discrete signal time division multiplexing method and a spectrum spread-based discrete signal time division multiplexing system, which solve the problem of reliable transmission of a plurality of discrete signals in a wireless channel in a sample point interweaving time division multiplexing mode. After the plurality of discrete signals are subjected to sample point interweaving by a transmitting end, synchronous information is superimposed by pseudo-random code (PN code)-based spectrum spread technology. The input discrete signals are processedby a receiving end by using the same PN code as that of the receiving end to extract synchronous information; and time division demultiplexing is performed according to the synchronous information torestore the multiple paths of transmitted discrete signals. The method has the characteristics of high frame synchronization and sample point synchronization accuracy and is easy to implement.
Description
Technical field
The invention belongs to communication technical field, relate to transfer of data, a kind of based on the multichannel discrete signal time division multiplexing transmission method of spread spectrum and the communication system that adopts this method to consist of specifically, be applied to digital communication.
Background technology
The time division multiplexing transmission of signal of communication generally has TDM (Time Division Multiplexing is referring to " Principles of Modern Communication " of publishing house of Tsing-Hua University publication in 2000) and OTDM (Orthogonal Frequency Division Multiplexing) dual mode.What the TDM mode was transmitted is data flow (or bit stream), both can divide the frame mode, also can the Bit Interleave mode transmit.OTDM for be continuous signal input, the sampling point data can be by minute frame mode (referring to Chinese invention patent [981128467]) or sample interweaving mode (referring to Chinese invention patent [200510042910.7]) transmission after the sampling.In time division multiplexing mode, the most important thing is stationary problem.Above-mentioned two kinds of time division multiplexing mode all take certain time interval resource, add synchronous mark to realize synchronously.When sampling point (or bit) interleaving mode is realized in wireless channel, require receiving terminal to adopt very high frame synchronization and the sampling point simultaneous techniques of precision, each road signal is separated in good condition, slightly having deviation all can cause between subchannel leaks mutually, even as long as there is the deviation in 1% sampling interval in the position of sampled point, just nearly may produce between the subchannel-leakage of 40dB, therefore, the synchronous implementation of the frame synchronization of these two kinds of time division multiplexing mode and sampling point is complicated.
The time-division multiplexing method that the present invention proposes is different from aforesaid way, what at first the present invention is directed to is the multichannel discrete signal, have wider application surface, and adopt spread spectrum technology based on pseudo noise code (PN code) to realize that high-precision frame synchronization and sampling point are synchronous.
The content of invention
The object of the invention is to overcome the deficiency of above-mentioned prior art, a kind of multichannel discrete signal time division multiplexing transmission method based on spread spectrum has been proposed and based on the communication system of the method, realization high accuracy frame synchronization and sampling point are synchronous when transmitting in wireless channel with the sample interweaving time division multiplexing mode to solve the multichannel discrete signal, and implementation is simple.
The object of the present invention is achieved like this:
A kind of multichannel discrete signal time division multiplexing transmission method based on spread spectrum that the present invention proposes is used for consisting of communication system, make a start a plurality of discrete signals are carried out sample interweaving after, adopt the spread spectrum technology stack synchronizing information based on the PN code; Receiving end at first adopts with the PN code of making a start identical the input discrete signal is processed, and extracts synchronizing information, and carries out the time-division tap according to synchronizing information, recovers the multichannel discrete signal that sends.The detailed process of transmission method of the present invention is as follows:
The step of making a start:
1) is provided with M complex value discrete signal sampling point sequence { x
0(n) }, { x
1(n) } ..., { x
M-1(n) }, its sampling point speed r
0, r
1..., r
M-1(sampling point/second) be simple ratio of integers, that is: r each other
0=R/n
0, r
1=R/n
1..., r
M-1=R/n
M-1(sampling point/second), wherein R is their least common multiple, n
0, n
1..., n
M-1It all is integer; Make a start and adopt sample interweaving time division multiplexing method with this M sampling point sequence, be arranged in a sampling point speed and be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2..., then there is N=n in each multiple connection frame period
0+ n
1+ ...+n
M-1Individual plural sampling point, the sampling point of each road signal equally spaced distribute therein;
2) a kind of bandwidth of employing is slightly less than 2R (Hz), unit impulse response length is approximately the 1/R zero phase-shift of (second) (or linear phase shift) raised cosine filter and carries out waveform shaping and quadrature amplitude modulation method (QAM), is f with frequency centered by the above-mentioned plural sampling point sequence modulation
CContinuous signal after send f
CCentre frequency for transmission channel;
3) adopt hidden simultaneous techniques or scrambler simultaneous techniques, carry out producing into based on the frame synchronization of spread spectrum, make a start and produce the periodically repetition of L pseudo noise code (PN code) doubly that a length is equivalent to the length of multiple connection frame, when adopting hidden simultaneous techniques, the PN code is periodically repeated waveform shaping as synchronizing signal, and with than a little less than the multiplexed signal many (intensity for example-20dB) is superimposed upon on the multiplexed signal and launches; When adopting the scrambler simultaneous techniques, first with the sampling point sequence ..., y
-1, y
0, y
1, y
2... (the y for example of each sampling point among the .}
m) adopt length be K the PN code P (n), n=1,2 ..., K} carries out spread spectrum, be about to the sampling point sequence ..., y
-1, y
0, y
1, y
2... in each sampling point (y for example
m), with the PN code { y of weighting
m.P (n), n=1,2 ..., K} replaces, obtain a sampling point speed and be KR (sampling point/second) plural sampling point sequence ..., z
-1, z
0, z
1, z
2..., then the length L of multiple connection frame PN code is doubly periodically repeated as synchronous code, for the multiplexed signal sampling point sequence of spread spectrum ..., z
-1, z
0, z
1, z
2... scrambling (namely multiplying each other), and then carry out waveform shaping and QAM modulation and transmission;
The receiving end step:
1) after above-mentioned modulation signal is transferred to receiving terminal by continuous channel, carries out quadrature frequency conversion, when adopting hidden simultaneous techniques, carry out quadrature sampling and quantification with the sample rate of uR (u 〉=2 herein), obtain a digital sampling point sequence of plural number; When adopting the scrambler simultaneous techniques, carry out quadrature sampling and quantification with the sample rate of uKR (u 〉=2 herein), obtain a digital sampling point sequence of plural number;
2) adopt and make a start the PN code identical and consist of that sync correlator is carried out frame synchronization and sampling point is synchronous, obtain also need rebuild synchronization waveform after the frame synchronization when adopting hidden simultaneous techniques when making a start, from receive signal, deduct, to eliminate its interference effect; When adopting the scrambler simultaneous techniques when making a start, obtaining does not need to rebuild synchronizing signal after the frame synchronization, and needs further the despreading of being correlated with of plural sampling point sequence; When obtain frame synchronization and sampling point synchronously after, carry out the u:1 down-sampling, obtain the sampling point sequence ..., y
-1, y
0, y
1, y
2...;
3) utilize the rule of frame synchronization and sample interweaving time division multiplexing, isolate the discrete sampling point sequence in each road.
The transmitting system of the hidden synchronous multichannel discrete signal time division multiplexing transmission method of above-mentioned employing comprises: sample interweaving time division multiplexing unit, synchronously generation unit, and QAM modulator; M complex value discrete signal sampling point sequence { x of input
0(n) }, { x
1(n) } ..., { x
M-1(n) } deliver to sample interweaving time division multiplexing cell processing, multiple connection be sampling point speed be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2... deliver to the QAM modulator; Generation unit produces the PN code that a length is equivalent to multiple connection frame length L times synchronously, and carries out being sent to the QAM modulator after the waveform shaping; The signal that the QAM modulator will be sent here from sample interweaving time division multiplexing unit carries out waveform and adds the synchronizing signal based on the PN code that lock unit produces, and then signal after the addition being modulated to centre frequency is f
CContinuous signal after send f
CCentre frequency for transmission channel;
Described synchronous generation unit comprises PN code generator, forming filter and digital to analog converter (DAC); Length of PN code generator generation is equivalent to multiple connection frame length L PN code doubly and delivers to forming filter; Forming filter carries out waveform shaping with the PN code and delivers to digital to analog converter (DAC), and signal is delivered to the QAM modulator after the digital-to-analogue conversion;
Described QAM modulator comprises forming filter, digital to analog converter (DAC), low pass filter and quad upconverter; The complex signal that forming filter receives after the multiple connection of sending here from sample interweaving time division multiplexing unit carries out delivering to digital to analog converter (DAC) after the waveform shaping, and forming filter adopts a kind of bandwidth to be slightly less than 2R (Hz), unit impulse response length is approximately the 1/R zero phase-shift of (second) (or linear phase shift) raised cosine filter; Digital to analog converter (DAC) output signal is delivered to low pass filter and is processed, signal and synchronously generation unit output signal addition after the low pass filter output, signal is delivered to quad upconverter after the addition, quad upconverter with addition after signal to be modulated to centre frequency be f
CContinuous signal after send f
CCentre frequency for transmission channel.
The receiving system of the hidden synchronous multichannel discrete signal time division multiplexing transmission method of above-mentioned employing, comprise: quadrature down converter, sample interweaving time division multiplexing unit, analog to digital converter (ADC), frequency deviation phase deflection correction unit, frequency deviation skew estimation unit, synchronization acquistion and tracking cell, the signal reconstruction unit, subtracter, u:1 down-sampler and time-division tapping unit; Quadrature down converter will receive signal and be converted to " zero intermediate frequency " complex signal, " zero intermediate frequency " complex signal is delivered to analog to digital converter (ADC), analog to digital converter (ADC) is sampled by the sample rate of uR (u 〉=2 herein), and the digital signal of sampling output divides two-way to deliver to frequency deviation phase deflection correction unit and frequency deviation skew estimation unit; Frequency deviation skew estimation unit produces frequency deviation phase deflection correction control signal and delivers to frequency deviation phase deflection correction unit, simultaneously complex signal is delivered to synchronization acquistion and tracking cell, and the synchronization acquistion unit produces frame synchronizing signal and delivers to the time-division tapping unit; Plural discrete signal was delivered to the signal reconstruction unit after synchronization acquistion and tracking cell were processed, and rebuild and delivered to subtracter based on the synchronizing signal of PN code; The control signal that frequency deviation phase deflection correction unit is sent here according to frequency deviation skew estimation unit, the complex signal that ADC is sent here carries out the frequency deviation phase deflection correction, and output signal is delivered to subtracter; Subtracter is sent frequency deviation phase deflection correction unit here deduct reconstruction in the complex signal synchronizing signal, subtracts each other rear signal and delivers to the u:1 down-sampler, and the time-division tapping unit is delivered in the output of u:1 down-sampler; The frame synchronizing signal that the time-division tapping unit is sent here according to the synchronization acquistion tracking cell, the signal that the u:1 down-sampler is sent here carries out sample interweaving time-division tap.
The transmitting system of the multichannel discrete signal time division multiplexing transmission method that above-mentioned employing scrambler is synchronous comprises: sample interweaving time division multiplexing unit, spectrum-spreading unit, scrambling unit, QAM modulator; M complex value discrete signal sampling point sequence { x of input
0(n) }, { x
1(n) } ..., { x
M-1(n) } deliver to sample interweaving time division multiplexing cell processing, the multiple connection output signal be sampling point speed be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2..., deliver to spectrum-spreading unit and carry out K times of spread spectrum; Signal is delivered to scrambling unit and is carried out scrambling behind the spectrum-spreading unit spread spectrum, and signal is delivered to the QAM modulator after the scrambling, and the QAM modulator is sent scrambling unit here signal and modulated to produce and transmit;
Described spectrum-spreading unit comprises frequency multiplier and spread spectrum PN code generator, PN code generator produce the PN sequence that length is K P (n), n=1,2 ..., K} delivers to frequency multiplier, frequency multiplier with the sampling point sequence ..., y
-1, y
0, y
1, y
2... in each sampling point (y for example
m), with the PN sequence { y of weighting
m.P (n), n=1,2 ..., K} replaces, obtain a plural sampling point sequence ..., z
-1, z
0, z
1, z
2..., deliver to scrambling unit;
Described scrambling unit comprises scrambler and scrambling PN code generator, the PN code that it is 1～10 times of frame period that scrambling PN code generator produces a length periodically repeats to deliver to as synchronous code and adds around device, scrambler to the multiplexed signal sampling point sequence of the spread spectrum sent here from spectrum-spreading unit ..., z
-1, z
0, z
1, z
2... scrambling (namely multiplying each other), then deliver to the QAM modulator;
Described QAM modulator comprises forming filter, digital to analog converter (DAC), quad upconverter; Forming filter receives the complex signal of sending here from scrambling unit to carry out delivering to digital to analog converter (DAC) after the waveform shaping, digital to analog converter (DAC) output signal is delivered to quad upconverter, quad upconverter with addition after signal to be modulated to centre frequency be f
CContinuous signal after send f
CCentre frequency for transmission channel.
The receiving system of the multichannel discrete signal time division multiplexing transmission method that above-mentioned employing scrambler is synchronous, comprise: quadrature down converter, sample interweaving time division multiplexing unit, analog to digital converter (ADC), frequency deviation phase deflection correction unit, frequency deviation skew estimation unit, synchronization acquistion and tracking cell, the descrambling unit, despread unit, u:1 down-sampler and time-division tapping unit; Quadrature down converter will receive signal and be converted to " zero intermediate frequency " complex signal, " zero intermediate frequency " complex signal is delivered to analog to digital converter (ADC), analog to digital converter (ADC) is sampled by the sample rate of uKR (u 〉=2 herein), and the digital signal of sampling output divides two-way to deliver to frequency deviation phase deflection correction unit and frequency deviation skew estimation unit; Frequency deviation skew estimation unit produces frequency deviation phase deflection correction control signal and delivers to frequency deviation phase deflection correction unit, simultaneously complex signal is delivered to synchronization acquistion and tracking cell, and the synchronization acquistion unit produces frame synchronizing signal and delivers to the time-division tapping unit; The control signal that frequency deviation phase deflection correction unit is sent here according to frequency deviation skew estimation unit, the complex signal that ADC is sent here carries out the frequency deviation phase deflection correction, and output signal is delivered to the descrambling unit and is carried out descrambling; The descrambling element output signal is delivered to despread unit and is carried out despreading; The despread unit output signal is delivered to the u:1 down-sampler, and the time-division tapping unit is delivered in the output of u:1 down-sampler; The frame synchronizing signal that the time-division tapping unit is sent here according to the synchronization acquistion tracking cell, the signal that the u:1 down-sampler is sent here carries out sample interweaving time-division tap;
Described descrambling unit comprises descrambler and descrambling PN code generator, descrambling PN code generator produces and delivers to descrambler with the PN code of the scrambled code phase of making a start, descrambler utilizes this PN code that the plural sampling point sequence of sending here from frequency deviation phase deflection correction unit is carried out descrambling, delivers to despread unit behind the descrambling;
Described despread unit comprises despreader and despreading PN code generator, despreading PN code generator produces and delivers to despreader with the PN code of the spreading code phase of making a start, despreader utilizes this PN code that the plural sampling point sequence of sending here from the descrambling unit is carried out despreading, delivers to the time-division tapping unit after the despreading.
The present invention has following good effect:
The present invention adopts the spread spectrum technology based on the PN code to realize multichannel discrete signal time division multiplexing, realized that the time-multiplexed high accuracy frame synchronization of signal sample interweaving and sampling point are synchronous, and implementation is simple.
Description of drawings
Fig. 1 is based on hidden synchronous system of the present invention transmitting portion theory diagram
Fig. 2 is based on hidden synchronous system of the present invention receiving unit theory diagram
Fig. 3 is based on the synchronous system of the present invention transmitting portion theory diagram of scrambler
Fig. 4 is based on the synchronous system of the present invention receiving unit theory diagram of scrambler
Embodiment:
Accompanying drawing is specific embodiments of the invention;
Below in conjunction with accompanying drawing action of the present invention is described in further detail.
With reference to Fig. 1, the transmitting system of the hidden synchronous multichannel discrete signal time division multiplexing transmission method of the employing that the present invention proposes comprises: sample interweaving time division multiplexing unit, synchronously generation unit, and QAM modulator; Described synchronous generation unit comprises PN code generator, forming filter and digital to analog converter (DAC); Described QAM modulator comprises two forming filters, two digital to analog converters (DAC), two low pass filters and quad upconverter;
The relation of its each unit of transmitting system and transmission processing step are as follows:
1) M complex value discrete signal sampling point sequence { x of input
0(n) }, { x
1(n) } ..., { x
M-1(n) } deliver to sample interweaving time division multiplexing cell processing, multiple connection be sampling point speed be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2... (I, Q two-way) deliver to the QAM modulator;
2) PN code generator produces the PN code that a length is equivalent to multiple connection frame length L times in the synchronous generation unit, delivers to forming filter in the synchronous generation unit, carries out being sent to the QAM modulator as synchronizing signal after the waveform shaping;
3) in the QAM modulator forming filter receive complex signal after the multiple connection of sending here from sample interweaving time division multiplexing unit ..., y
-1, y
0, y
1, y
2... carrying out waveform shaping, forming filter adopts a kind of bandwidth to be slightly less than 2R (Hz), unit impulse response length is approximately the 1/R zero phase-shift of (second) (or linear phase shift) raised cosine filter; Signal is delivered to digital to analog converter in the QAM modulator (DAC) after the waveform shaping, digital to analog converter (DAC) output signal is delivered to low pass filter processing in the QAM modulator, DAC output signal and the synchronizing signal addition of sending here from synchronous generation unit, signal is delivered to quad upconverter in the QAM modulator after the addition, quad upconverter with addition after signal to be modulated to centre frequency be f
CContinuous signal after send f
CCentre frequency for transmission channel.
With reference to Fig. 2, the receiving system of the hidden synchronous multichannel discrete signal time division multiplexing transmission method of the employing that the present invention proposes, comprise: quadrature down converter, sample interweaving time division multiplexing unit, analog to digital converter (ADC), frequency deviation phase deflection correction unit, frequency deviation skew estimation unit, synchronization acquistion and tracking cell, signal reconstruction unit, subtracter, u:1 down-sampler and time-division tapping unit;
The relation of its each unit of receiving system and transmission processing step are as follows:
1) quadrature down converter will receive signal and be converted to " zero intermediate frequency " complex signal, " zero intermediate frequency " complex signal is delivered to analog to digital converter (ADC), analog to digital converter (ADC) is sampled by the sample rate of uR (u 〉=2 herein), and the digital signal of sampling output divides two-way to deliver to frequency deviation phase deflection correction unit and frequency deviation skew estimation unit;
2) frequency deviation skew estimation unit produces frequency deviation phase deflection correction control signal and delivers to frequency deviation phase deflection correction unit, and frequency deviation phase deflection correction unit carries out the frequency deviation phase deflection correction with the complex signal that ADC sends into, and complex signal is delivered to subtracter after correcting;
3) synchronization acquistion and tracking cell are according to the complex signal of sending into from frequency deviation skew estimation unit, following the tracks of synchronously the PN code identical with transmitting system with catching employing follows the tracks of synchronously and catches, produce frame synchronizing signal and deliver to the time-division tapping unit, complex signal was delivered to the signal reconstruction unit after synchronization acquistion and tracking cell were processed; Synchronization acquistion and tracking cell are rebuild and are delivered to subtracter based on the synchronizing signal of PN code;
4) complex signal sent here from frequency deviation phase deflection correction unit of subtracter deducts the reconstruction synchronizing signal of sending here from synchronization acquistion and tracking cell, subtracts each other rear signal and is sent to the u:1 down-sampler;
5) the u:1 down-sampler will carry out the u:1 down-sampling from the complex signal that subtracter is sent here, deliver to the time-division tapping unit after the sampling, and the time-division tapping unit is delivered in output; The synchronizing signal that the time-division tapping unit is sent here according to the synchronization acquistion tracking cell, the signal that the u:1 down-sampler is sent here carries out sample interweaving time-division tap.
With reference to Fig. 3, the transmitting system of the multichannel discrete signal time division multiplexing transmission method that the employing scrambler that the present invention proposes is synchronous comprises: sample interweaving time division multiplexing unit, spectrum-spreading unit, scrambling unit, QAM modulator; Spectrum-spreading unit comprises frequency multiplier and spread spectrum PN code generator, and described spectrum-spreading unit comprises frequency multiplier and spread spectrum PN code generator, and described QAM modulator comprises two forming filters, two digital to analog converters (DAC), quad upconverter;
The relation of its each unit of transmitting system and transmission processing step are as follows:
1) M complex value discrete signal sampling point sequence { x of input
0(n) }, { x
1(n) } ..., { x
M-1(n) } deliver to sample interweaving time division multiplexing cell processing, the multiple connection output signal be sampling point speed be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2...;
2) plural sampling point sequence ..., y
-1, y
0, y
1, y
2... deliver to spectrum-spreading unit, the PN code generator of spectrum-spreading unit produce the PN sequence that length is K P (n), n=1,2 ..., K} delivers to the frequency multiplier of spectrum-spreading unit, frequency multiplier with the sampling point sequence ..., y
-1, y
0, y
1, y
2... in each sampling point (y for example
m), with the PN sequence { y of weighting
m.P (n), n=1,2 ..., K} replaces, obtain a plural sampling point sequence ..., z
-1, z
0, z
1, z
2..., deliver to scrambling unit;
3) the scrambling PN code generator of the scrambling unit PN code that to produce a length be 1～10 times of frame period is delivered to scrambler, scrambler to the multiplexed signal sampling point sequence of the spread spectrum sent here from spectrum-spreading unit ..., z
-1, z
0, z
1, z
2... scrambling (namely multiplying each other), signal is delivered to the QAM modulator after the scrambling;
4) forming filter in the QAM modulator with scrambling after multiple connection sampling point sequence carry out waveform shaping, signal is delivered to digital to analog converter (DAC) after being shaped, the DAC output signal is delivered to quad upconverter, quad upconverter with addition after signal to be modulated to centre frequency be f
CContinuous signal after send f
CCentre frequency for transmission channel.
With reference to Fig. 4, the receiving system of the multichannel discrete signal time division multiplexing transmission method that the employing scrambler that the present invention proposes is synchronous, comprise: quadrature down converter, sample interweaving time division multiplexing unit, two analog to digital converters (ADC), frequency deviation phase deflection correction unit, frequency deviation skew estimation unit, synchronization acquistion and tracking cell, descrambling unit, despread unit, u:1 down-sampler and time-division tapping unit; Described descrambling unit comprises descrambler and descrambling PN code generator, and described descrambling unit comprises descrambler and descrambling PN code generator;
The relation of its each unit of receiving system and transmission processing step are as follows:
1) quadrature down converter will receive signal and be converted to " zero intermediate frequency " complex signal, " zero intermediate frequency " complex signal is delivered to analog to digital converter (ADC), analog to digital converter (ADC) is sampled by the sample rate of uKR (u 〉=2 herein), and the digital signal of sampling output divides two-way to deliver to frequency deviation phase deflection correction unit and frequency deviation skew estimation unit;
2) frequency deviation skew estimation unit produces frequency deviation phase deflection correction control signal according to the rear complex signal of sampling, delivers to frequency deviation phase deflection correction unit, simultaneously complex signal is delivered to synchronization acquistion and tracking cell; The synchronization acquistion unit produces frame synchronizing signal and delivers to the time-division tapping unit; The control signal that frequency deviation phase deflection correction unit is sent here according to frequency deviation skew estimation unit, the complex signal that ADC is sent here carries out the frequency deviation phase deflection correction, and output signal is delivered to the descrambling unit;
3) the descrambling PN code generator in the descrambling unit produces and delivers to descrambler with the PN code of the scrambled code phase of making a start, descrambler in the descrambling unit utilizes this PN code that the plural sampling point sequence of sending here from frequency deviation phase deflection correction unit is carried out descrambling, delivers to despread unit behind the descrambling; Despreading PN code generator produces and delivers to despreader with the PN code of the spreading code phase of making a start, and despreader utilizes this PN code that the plural sampling point sequence of sending here from the descrambling unit is carried out despreading, delivers to the u:1 down-sampler after the despreading;
4) u:1 down-sampler signal that despread unit is sent into carries out the u:1 down-sampling, and the time-division tapping unit is delivered in the output that down-sampling is received; The frame synchronizing signal that the time-division tapping unit is sent here according to the synchronization acquistion tracking cell, the signal that the u:1 down-sampler is sent here carries out sample interweaving time-division tap.
The present invention is not limited to above-mentioned example, utilizes principle of the present invention and scheme those skilled in the art can make various modifications or remodeling, but these improvement and application are all within protection scope of the present invention.
Claims (5)
1. multichannel discrete signal time division multiplexing transmission method based on spread spectrum, the signal treatment step of its transmitting terminal and receiving terminal is as follows:
Transmitting terminal signal treatment step:
1) is provided with M complex value discrete signal sampling point sequence { x
0(n) }, { x
1(n) } ..., { x
M-1(n) }, its sampling point speed r
0, r
1..., r
M-1(sampling point/second) be simple ratio of integers, that is: r each other
0=R/n
0, r
1=R/n
1..., r
M-1=R/n
M-1(sampling point/second), wherein R is their least common multiple, n
0, n
1..., n
M-1It all is integer; Transmitting terminal adopts sample interweaving time division multiplexing method with this M sampling point sequence, be arranged in a sampling point speed and be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2..., then there is N=n in each multiple connection frame period
0+ n
1+ ... n
M-1Individual plural sampling point, the sampling point of each road signal equally spaced distribute therein;
2) adopting a kind of bandwidth to equal 1.8R (Hz), unit impulse response length is that the zero phase-shift raised cosine spectral property filter of 1/R (second) carries out waveform shaping and quadrature amplitude modulation (QAM), is f with frequency centered by the above-mentioned plural sampling point sequence modulation
CThe Digital Modulation continuous signal after send f
CCentre frequency for transmission channel;
3) adopt hidden simultaneous techniques or scrambler simultaneous techniques, carry out generating based on the frame synchronization of spread spectrum, transmitting terminal produces a length and is equivalent to the periodically repetition of multiple connection frame length L pseudo noise code (PN code) doubly, when adopting hidden simultaneous techniques, the PN code is periodically repeated waveform shaping as synchronizing signal, and be superimposed upon on the multiplexed signal with the intensity than 15～20dB a little less than the multiplexed signal and launch; When adopting the scrambler simultaneous techniques, first with the sampling point sequence ..., y
-1, y
0, y
1, y
2... in each sampling point adopt length be K the PN code P (n), n=1,2..., K} carries out spread spectrum, be about to ..., y
-1, y
0, y
1, y
2... in each sampling point adopt the PN code of weighting to replace, obtain a sampling point speed and be KR (sampling point/second) plural sampling point sequence ..., z
-1, z
0, z
1, z
2..., then the length L of multiple connection frame PN code is doubly periodically repeated as synchronous code, for the multiplexed signal sampling point sequence of spread spectrum ..., z
-1, z
0, z
1, z
2... the scrambling of multiplying each other, and then carry out waveform shaping and QAM modulation, send after being modulated to the Digital Modulation continuous signal;
The receiving end signal treatment step:
1) after described Digital Modulation continuous signal is transferred to receiving terminal by continuous channel, carry out quadrature frequency conversion, definition u is oversample factor, u=2,3 or 4; When adopting hidden simultaneous techniques, carry out quadrature sampling and quantification with the sample rate of uR, obtain a digital sampling point sequence of plural number; When adopting the scrambler simultaneous techniques, carry out quadrature sampling and quantification with the sample rate of uKR, obtain a digital sampling point sequence of plural number;
2) adopt the PN code identical with transmitting terminal to consist of that sync correlator is carried out frame synchronization and sampling point is synchronous, when transmitting terminal adopts hidden simultaneous techniques, obtain also need rebuild synchronization waveform after the frame synchronization, from the reception signal, deduct, to eliminate its interference effect; When transmitting terminal adopted the scrambler simultaneous techniques, obtaining did not need to rebuild synchronizing signal after the frame synchronization, and needed further the despreading of being correlated with of plural sampling point sequence; When obtain frame synchronization and sampling point synchronously after, carry out the u:1 down-sampling, obtain the sampling point sequence ..., y
-1, y
0, y
1, y
2...;
3) utilize the rule of frame synchronization and sample interweaving time division multiplexing, isolate the discrete sampling point sequence in each road.
2. described a kind of multichannel discrete signal time division multiplexing transmission method based on spread spectrum according to claim 1 is characterized in that the transmitting terminal signal processes that employed hidden simultaneous techniques comprises sample interweaving time division multiplexing unit, the signal of generation unit and QAM modulator is processed synchronously; The M of an input plural discrete signal sampling point sequence { x
0(n) }, { x
1(n) } ..., { x
M-1(n) } deliver to sample interweaving time division multiplexing cell processing, multiple connection be sampling point speed be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2... deliver to the QAM modulator; Generation unit produces the PN code that a length is equivalent to multiple connection frame length L times synchronously, and carries out being sent to the QAM modulator after the waveform shaping; The signal that the QAM modulator will be sent here from sample interweaving time division multiplexing unit carries out waveform shaping and adds the synchronizing signal based on the PN code that lock unit produces, and then signal after the addition being modulated to centre frequency is f
cThe Digital Modulation continuous signal after send f
cCentre frequency for transmission channel.
3. described a kind of multichannel discrete signal time division multiplexing transmission method based on spread spectrum according to claim 1 is characterized in that receiving end signal processes the signal that employed hidden simultaneous techniques comprises quadrature down converter, sample interweaving time division multiplexing unit, analog to digital converter (ADC), frequency deviation phase deflection correction unit, frequency deviation skew estimation unit, synchronization acquistion and tracking cell, signal reconstruction unit, subtracter, u:1 down-sampler and time-division tapping unit and process; U is defined oversample factor, u=2,3 or 4; Quadrature down converter will receive signal and be converted to " zero intermediate frequency " complex digital signal, " zero intermediate frequency " complex digital signal is delivered to analog to digital converter (ADC), analog to digital converter (ADC) is sampled by the sample rate of uR, and the digital signal of sampling output divides two-way to deliver to frequency deviation phase deflection correction unit and frequency deviation skew estimation unit; Frequency deviation skew estimation unit produces frequency deviation phase deflection correction control signal and delivers to frequency deviation phase deflection correction unit, simultaneously complex digital signal is delivered to synchronization acquistion and tracking cell, and the synchronization acquistion unit produces frame synchronizing signal and delivers to the time-division tapping unit; Complex digital signal was delivered to the signal reconstruction unit after synchronization acquistion and tracking cell were processed, and rebuild and delivered to subtracter based on the synchronizing signal of PN code; The control signal that frequency deviation phase deflection correction unit is sent here according to frequency deviation skew estimation unit, the complex digital signal that ADC is sent here carries out the frequency deviation phase deflection correction, and output signal is delivered to subtracter; Subtracter is sent frequency deviation phase deflection correction unit here deduct reconstruction in the complex digital signal synchronizing signal, subtracts each other rear signal and delivers to the u:1 down-sampler, and the time-division tapping unit is delivered in the output of u:1 down-sampler; The frame synchronizing signal that the time-division tapping unit is sent here according to the synchronization acquistion tracking cell, the signal that the u:1 down-sampler is sent here carries out sample interweaving time-division tap.
4. described a kind of multichannel discrete signal time division multiplexing transmission method based on spread spectrum according to claim 1 is characterized in that the transmitting terminal signal processes the signal that employed scrambler simultaneous techniques comprises sample interweaving time division multiplexing unit, spectrum-spreading unit, scrambling unit and QAM modulator and process; The M of an input plural discrete signal sampling point sequence { x
0(n) }, { x
1(n) } ... { x
M-1(n) } deliver to sample interweaving time division multiplexing cell processing, the multiple connection output signal be sampling point speed be R plural sampling point sequence ..., y
-1, y
0, y
1, y
2... .}, deliver to spectrum-spreading unit and carry out K times of spread spectrum; Signal is delivered to scrambling unit and is carried out scrambling behind the spectrum-spreading unit spread spectrum, and signal is delivered to the QAM modulator after the scrambling, and the QAM modulator is sent scrambling unit here signal and modulated to produce and transmit.
5. described a kind of multichannel discrete signal time division multiplexing transmission method based on spread spectrum according to claim 1, it is characterized in that scrambler simultaneous techniques that receiving end signal process to use comprises the signal processing of quadrature down converter, sample interweaving time division multiplexing unit, analog to digital converter (ADC), frequency deviation phase deflection correction unit, frequency deviation skew estimation unit, synchronization acquistion and tracking cell, descrambling unit, despread unit, u:1 down-sampler and time-division tapping unit, wherein u is defined oversample factor, u=2,3 or 4; Quadrature down converter will receive signal and be converted to " zero intermediate frequency " complex digital signal, " zero intermediate frequency " complex digital signal is delivered to analog to digital converter (ADC), analog to digital converter (ADC) is sampled by the sample rate of uKR, and the digital signal of sampling output divides two-way to deliver to frequency deviation phase deflection correction unit and frequency deviation skew estimation unit; Frequency deviation skew estimation unit produces frequency deviation phase deflection correction control signal and delivers to frequency deviation phase deflection correction unit, simultaneously complex digital signal is delivered to synchronization acquistion and tracking cell, and the synchronization acquistion unit produces frame synchronizing signal and delivers to the time-division tapping unit; The control signal that frequency deviation phase deflection correction unit is sent here according to frequency deviation skew estimation unit, the complex digital signal that ADC is sent here carries out the frequency deviation phase deflection correction, and output signal is delivered to the descrambling unit and is carried out descrambling; The descrambling element output signal is delivered to despread unit and is carried out despreading; The despread unit output signal is delivered to the u:1 down-sampler, and the time-division tapping unit is delivered in the output of u:1 down-sampler; The frame synchronizing signal that the time-division tapping unit is sent here according to the synchronization acquistion tracking cell, the signal that the u:1 down-sampler is sent here carries out sample interweaving time-division tap.
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| CN102801472A (en) * | 2012-07-16 | 2012-11-28 | 北京邮电大学 | Ultraviolet communication method based on spread spectrum communication and sliding mean filtering |
| CN103795487B (en) * | 2013-09-30 | 2015-03-11 | 深圳光启创新技术有限公司 | Visible optical signal sending processing method, receiving processing method, and processing system, and visible optical signal transmission terminal and receiving terminal |
| CN110138697B (en) * | 2019-03-10 | 2020-07-10 | 西安电子科技大学 | Low-phase-noise continuous wave time division multiplexing wireless transmission method and system |
| CN109714142B (en) * | 2019-03-11 | 2020-05-05 | 西安电子科技大学 | Orthogonal time division multiplexing transmission method and system |
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