The data transmission method

 

The invention relates to a method of transmitting information. How is that on the transmission side of the first and second sequences of digital samples of information form first and second analog signals, and the first analog signal formed from the difference of the values of the digital samples of the first information sequence and the values of the digital samples of the second information sequence, taken at the points of digital samples of the first information sequence and the second analog signal form of digital samples of the second information sequence, taken at the points of digital samples of the second information sequence, which is located between the points of digital samples of the first information sequence, then summarize the first and second analog signals and transmit the total analog signal to a communication line, and at the receiving side restores the first sequence of digital samples of information by sampling the total analog signal clock frequency, then transform the first sequence of digital samples of information using the specified function samples the analog signal of the first sequence, ollivaud obtained from a differential analog signal, the second sequence of digital samples of information. For implementing the method offers two kinds of given functions of the samples. The technical result achieved by implementation of the method is to increase the transmission speed or bandwidth communication lines. 2 C.p. f-crystals, 6 ill.

Region technology the Invention relates to techniques for transmitting and receiving information and can be used in communication systems, measurements, etc.,

The existing level of technology In the transmission of digital data via communication lines, there is the problem of limiting the speed of its transmission.

The maximum possible data transmission rate in the communication line can be determined by the formula of Shannon:where P is the bandwidth of the communication line, kHz, RC- power transmitted signal, dB; PP- power interference in the communication line, dB.

For telephone line connection with a bandwidth of 3.1 kHz bandwidth (300 Hz-3.4 kHz) and the ratio RC/PP= 10000 (which corresponds to 40 dB) theoretically maximum possible speed transmission (and reception) of discrete data is C=3,1103log210000=40 kbit/s

Modern dial-up modems firms "robotics" and "Motorola" provide 40 dB), reflecting on the implementation of the transfer rate close to potential by the formula of Shannon.

There is a method of transmitting information, namely, that on the transmission side to form an analog signal by converting a sequence of discrete digital samples to an analog signal using a specified function counts and transmit the generated analog signal to a communication line, and at the receiving side receive the transmitted analog signal from the communication line and recover from him the original sequence of discrete digital samples of information (tiled Japan's bid 10-098497, H 04 L 27/10, 14.04.1998).

The speed of transmission and reception of information with this method of information transfer depends on the method of converting a sequence of discrete digital samples to an analog signal on the transmission side and the method of recovery of the analog signal source discrete digital samples of information at the receiving side and the limited capacity of the existing communication equipment pulse code modulation (PCM).

When transmitting on the same link at the same time two analog signals of the same Photo in the following form:Then it follows that for a fixed power(i.e., when RC1= PC2) the maximum possible transmission rate and reception of information can be brought up With=3,1103log25000+3,1103log2500073 kbit/S. Therefore, in the telephone communication lines, the softening of two power makes it possible to increase the speed of sending and receiving information and implement the bandwidth limit current equipment pulse code modulation (PCM), which is 64 kbit/s

The objective of the invention and the technical result
The present invention is to develop a method of transmitting information using decompression in two capacities, which increases the speed of transmission of digital data via the existing communication channels, or what is the same - you can send at the same speed for more information.

The technical result of the invention is to provide a transmission through an existing communication channel (without changing the settings of the last) instead of one analog signal and method of transmitting information, namely, that on the transmission side converts the first digital sequence samples the first analog signal by multiplication with the signal given function counts and transmit the generated analog signal on the communication line, and at the receiving side receive the transmitted analog signal from the communication line and restore from a received analog signal, the first sequence of digital samples, according to the present invention, on the transmission side: convert the second sequence of digital samples in the second analog signal by multiplication with the signal given function counts, at this moments clocking times for the second sequence of digital samples have between clocking times for the first sequence of digital samples; a first analog signal obtained by converting digital samples, the values of which are equal to the difference between digital samples of the first sequence and the values of the second analog signal in moments clocking times for the first sequence; summarize the first and second analog signals, and then transmit the generated total analog signal on a line with reatogo analog signal clock frequency; restored digital samples of the first sequence is converted into a first analog signal using a signal of a predetermined function counts; subtract the recovered first analog signal from a received analog signal; restore digital samples of the second sequence from the received differential analog signal.

At the same time as the specified function counts use the function

any function of the form

where x= 2FBFBthe upper frequency in the spectrum of the transmitted signal, n is an integer greater than one, the number of frequency components, k= 1-20 and characterizes the degree of truncation of the given function counts. In addition, the point counts of the second sequence to form in the middle between the points of the samples of the first sequence and the first and second sequences of digital samples to get information from one information source or two different sources of information.

Brief description of drawings
Fig. 1. The block diagram of the processing of the first and second sequences of digital samples of information on the transmission side.

Feemy communication at the receiving side.

Fig.4. A view of the specified function counts
.

Fig.5. Range specified function of the samples in Fig.4.

Fig.6. The block diagram of the generator given function counts

on the transmission side.

Detailed description of the invention
The data transmission method of the present invention is realized in the communication system, the flowchart of which the transmitting and receiving sides are shown respectively in Fig.1, 2 and 3.

The block diagram of the processing of the first and second sequences of digital samples of information on a transmitting side of a communication system includes (Fig.1) generator 1 clock frequency, the first 2 and second 3 digital to analog converters, myCitadel 4, the imaging unit 5 envelope, analog-to-digital Converter 6.

To the first output of the generator 1 clock frequency do an even clock signal frequency, and the second output is an odd clock signal frequency. The first output of the generator 1 clock frequency connected to the input of the first 2 digital to analogue Converter DAC-1, and a second output connected to the input of the second 3 digital to analogue Converter DAC-2. These converters DAC-1 and DAC-2 transform of the original sequence discreta corresponding discrete digital samples.

To input the first 2 digital to analogue Converter DAC-1 receives the first sequence of discrete digital samples And1iinformation, where i is the number of digital readout information, i=0, 1... n-1, which is converted into the first sequence of rectangular digital samples And10, A11, ... A1n-2, A1n-1information and serves on the output of DAC - 1 signals corresponding to the even clock signals of the frequency generator 1 clock frequency. Implementation of the method is demonstrated for n=4.

On the second input 3 digital to analogue Converter DAC-2 enters the second sequence of discrete digital samples And2iinformation, where i= n-1, which converts the second sequence of rectangular digital samples And20, A21,... A2n-2, A2n-1information and serves on the DAC output-2 signal corresponding to the odd clock signal frequency (i.e., clock frequency) of the oscillator clock frequency.

The first and second sequences of digital samples of information can come from two independent sources of information, and a single source of information. In the second of lucikly and serves on the independent informational inputs of blocks 2 and 3 of Fig.1.

The output of the first 2 digital to analogue Converter DAC-1 is connected to the input of vicites 4. The output of the second 3 digital to analogue Converter DAC-2 is connected to the input of the shaper envelope 5 (multiplier), and also has a second output sequence of rectangular digital samples And20, A21,... A2n-2, A2n-1information forming unit total analog signal. To the second input of the shaper 5 envelope serves the specified function of the timing of its generator. The specified function samples can be


The output of shaper envelope 5 is connected to the first input of the analog-to-digital Converter 6 (ADC). At the output of the shaper 5 envelope envelope is formed of the second sequence of digital samples of information that serves at the first input of the analog-to-digital Converter 6, to the second input of which serves an even clock signal frequency to the first input of the generator 1 clock frequency.

The output of the analog-to-digital Converter 6 is connected to the input of vicites 4. In analog-to-digital Converter 6 are calculated (taking) values of samples of the second pollinate rectangular signalsA2i:A20,A2lthat...A2n-2,A2n-1serves to the second input of vicites 4. In myCitadel 4 is a subtraction from the first sequence of rectangular digital samples And10, A11,... A1n-2, A1n-1relevant taken (calculated) in analog-to-digital Converter 6 valuesA20,A2lthat...A2n-2,A2n-1.
The sequence difference between the digital samples to A10-A20...A1n-1-A2n-1information and the second sequence is converted into rectangular pulses digital samples of information And20, A21,... A2n-2, A2n-1serves to corresponding inputs of a block-scheme of the formation of the total analog signal on the transmitting side (Fig.2).

The sequence of digital samples of information And20, A2...A1n-1-A2n-1before entering the forming unit total signal (Fig.2) convert the known methods in the parallel code using Converter serial code in parallel (Fig. not shown).

The block-diagram of the formation of the total analog signal on the transmission side includes (Fig.2) shaper 7 preset function counts, which consists of a generator 8, the first specified function of the timing generator 9 second given function of the timing and multiplier 10 of the assigned functions of the samples, the input of which is connected to the outputs of the generators 8 and 9 preset functions counts, and the output is the output of the shaper 7 preset function counts.

Next, the transmitting side includes two groups of multiplier products 11-14 and 15-18, each of which contains n (Fig.2 is shown for n=4) multiplier products specified function of the timing and sequence of digital samples of information that serves for informational inputs of multiplier products. The reference inputs of the multiplier products 11-14 and 15-18 combined and connected to the output of the shaper 7 preset function counts.

For informational inputs of multiplier products 11-14 and 15-18 served accordingly consequently the sequence, which is calculated at the points of the samples of the first sequence, A10-A20...A1n-1-A2n-1and second sequence of digital samples of information And20, A21,... A2n-2, A2n-1.

The output of each multiplier products 11-14 and 15-18 is connected via the corresponding element 19-22 and 23-26 delay with the respective input respectively shaper 27 of the first envelope and shaper 28 of the second envelope. The outputs of these generators 27 and 28 of the envelope is connected to the inputs of the adder 29, the output of which is directly and through quadrature phase shifter 30 is connected to information inputs respectively of the first and second output multiplier products 31 and 32, the reference inputs which serves quadrature reference oscillations of the carrier frequency f0accordingly cos0t and sin0t, where0= 2f0. Outputs the output of the multiplier products 31 and 32 are connected to respective inputs of the adder 33, the output of which is connected to the input of a communication channel (not shown), such as a radio link.

In zalogovykh signals, the phase shift given function samples respectively from 0 to (n-1)and the formation of elements (fragments) of the envelope. The first element 19 of the first delay group delay entering the analog signal is 0 seconds (no delay signal), i.e., this element is specified in the circuit of Fig.2 only for consistency. Each of the following items 20-22 delay is the delay time of the analog signal that is different from the delay time of the previous item on the value of the repetition period of the sequence of digital samples of informationC=1/FBwhere FBthe upper frequency in the spectrum of the transmitted analog signal. The same rule for elements 23-26 delay of the second group, but the first element 23 delay has a delay time equal to TC/2.

Quadrature phase shifter 30 provides a phase change arriving at its input an analog signal by the value of/2 (for carrier frequency f0).

The reception side communication system includes (Fig.3) quadrature phase shifter 34, the inlet of which is combined with the information input to the first input of multiplier 35 and is connected to the output of the communication channel (not shown), and the output of the quadrature of futuredate is the breaking multiplier products 35 and 36 serves the same quadrature reference oscillations of the carrier frequency f0accordingly cos0t and sin0t that on the transmission side. The outputs of the input multiplier products 35 and 36 are connected to respective inputs of vicites 37, the output of which is connected to the inputs of the selector 38 clock frequency of the first analog-to-digital Converter 39 (ADC) and to the first input of vicites 40. The output of the first analog-to-digital Converter 39 is connected to the first input of the shaper 41 envelope, to the second input of which serves a given function counts that look identical to the specified function counts on the transmission side, and the output of which is connected to the second input of vicites 40. Direct and inverted outputs of the selector 38 clock frequency is connected to clock inputs, respectively, of the first analog-to-digital Converter 39 and the second analog-to-digital Converter 42, the outputs of which are respectively output 43 of the first sequence of digital samples and an output 44 of the second sequence of digital samples of information.

Quadrature phase shifter 34 provides a phase change arriving at its input the total analog signal by the value of/2 (for carrier frequency f

As a first function of the counts generated by the generator 8 preset function counts, you can use a known function of the form

where x= 2FBFBthe upper frequency in the spectrum of the transmitted analog signal. However, to reduce distortion in the transmission of discrete samples information on real channels of communication with the carrier it is advisable to choose as the first given function times a function of the form

where x= 2FBFBthe upper frequency in the spectrum of the transmitted analog signal, n is an integer greater than one, equal to the number of used frequency components in the spectrum of the analog signal. The value of n is determined by the formula n= T/2TC, where T is a given processing interval (period specified function counts), in this case 10,66667 MS, and TC=1/FBthe repetition period of the sequence of digital samples of information.

Specified the specified function of the samples has the form shown in Fig.4 (the ETA shown in Fig.6. The specified generator consists of eight series-connected individual blocks 45.1 - 45.8 conversion. Each conversion unit includes a first 46 and second 47 multiplier products, quadrature phase shifter 48 and the adder 49. In Fig.6 each of the eight blocks used 45 transformation denoted by the reference position 45.j, where j denotes the sequence number of this block 45 conversion. Each element of the corresponding block 45 conversion also has a dual designation, where the second digit specifies the number of block 45 conversion, which includes this item. In each block 45 convert the output of the quadrature phase shifter 48 is connected to the information input of the second multiplier 47, and outputs both multiplier products 46 and 47 are connected to respective inputs of the adder 49. When this input quadrature phase shifter 48 is combined with the information input of the first multiplier 46 and an information input of this block 45 conversion, and the output of the adder 49 is the output of this block 45 conversion.

The reference inputs of the first multiplier products 46.1 and 46.2 and reference inputs of the second multiplier products 47.1 and 47.2 of the first and second blocks 45.1 and 45.2 conversion, respectively, are combined and I had astaty, the appropriate size of 4 in the expression (2). The reference inputs of the first multiplier products 46.3 and 46.4 and reference inputs of the second multiplier products 47.3 and 47.4 third and fourth blocks 45.3 and 45.4 conversion, respectively, are combined and are used as inputs 52 and 53 quadrature reference frequency of sampling of the entire generator, i.e., the frequency corresponding to the value of 2 in the expression (2). Finally, the reference inputs of the first multiplier products 46.5, 46.6, 46.7 and 46.8 and reference inputs of the second multiplier products 47.5, 47.6, 47.7 and 47.8 fifth to eighth blocks 45.5, 45.6, 45.7 and 45.8 conversion, respectively, are combined and are used as inputs 54 and 55 quadrature reference oscillations at half the sampling frequency, i.e. the frequency corresponding to the value of x in the expression (2). The information input of the first block 45.1 conversion is an information input 56 of the generator, and the output of the eighth block 45.8 conversion is output 57 of the generator given function counts.

Quadrature phase shifter 48 in each block 45 conversion provides the phase change arriving at its input signal by the value of/2 (for the upper frequencies in the spectrum of the transmitted analog signal FB).

To generate the specified function counts on sub> (the upper frequency in the spectrum of the transmitted analog signal). Quadrature reference oscillation serves to corresponding inputs of the generator given function counts from the external pulse generator, the outputs of which form the quadrature reference oscillations of double, single and half the sampling frequency.

The second function of the counts generated by the generator 9 in the shaper 7 preset function counts, may be of various types. The following are examples of implementation of the method according to the present invention for two different types of second function of the timing generator output 9:


where k=1-20 and characterizes the degree of truncation of the given function counts. In that case, if the generator 9 of the second function generates samples of the first of these functions is defined by the expression (3), myCitadel 37 at the receiving side has at its output a digital filter with impulse response of the form (3).

The data transmission method of the present invention is realized in the communication system according to Fig.1,2 and 3 as follows.

Two (first And1iand the second And2iindependent of the sequence of discrete digital samples of informarte sequence of digital samples of information TC=1/FBwhere FBthe upper frequency in the spectrum of the transmitted analog signal, at the same time served, respectively, to the input of the first 2 and second 3 digital to analog converters DAC-1 and DAC-2. After the DAC-1 and DAC-2 is converted to a sequence of digital samples served: the first sequence of digital samples of information And10And11. . . A1n-2, A1n-1input vicites 4 and the second sequence of digital samples of information And20And21... A2n-2, A2n-1at the input of the shaper envelope 5 and through the transducer sequential code in parallel, each digital count of the second sequence corresponding to the information input of the multiplier products 15-18 forming unit total signal (Fig. 2). Because the first 2 d / a Converter DAC-1 is powered by generator clock frequency even signals, and the second 3 d / a Converter DAC-2 is odd signals, the digital samples of the second information sequence And20And21... A2n-2, A2n-1after the DAC-2 will be taken at the points of digital samples of the second PEFC/p> In the shaper envelope 5 is formed by using a specified function of envelope samples of the second sequence of digital samples of information in pixels digital samples of the second sequence, the determination of the values of digital samples at the points of digital samples of the first sequence and the subsequent formation of a second sequence of digital samples of data taken at points digital samples of the first information sequenceA20,A2lthat...A2n-2,A2n-1. The sequence of digital samples is served in myCitadel 4, where the subtraction of the values of the digital samples of the first information sequence And10And11... A1n-2, A1n-1values of the digital samples of the second information sequence, taken at the points of digital samples of the first information sequenceA20,A2lthat...A2n-2,A2n-1. and the difference in the form cyfrowy is sup>n-1-A2n-1through Converter serial code in parallel serves to the information inputs of the multiplier products 11-14 forming unit total analog signal.

The generator 8 preset function counts (Fig.2) forms a first given function of the timing defined by the expression (2), on the interval TC=10,66667 MS. The generator 9 generates a second given function of the timing defined by the expression (3) or (4). At the output of the multiplier 10 in the shaper 7 preset function counts depending on the specific type of the second specified function counts form the signal


where k characterizes the degree of truncation of the given function counts, for example, k=16.

This preset function counts served on the reference inputs of all multiplier products 11-14 and 15-18 (Fig.2).

From a processing unit of the first and second sequences of digital samples of information on the information inputs of the first group of multiplier products 11-14 serves a corresponding digital samples of information A10-A20...A1n-1-A220And21... A2n-2, A2n-1(preferably, the point counts of the second sequence And20And21... A2n-2, A2n-1was in the middle between the points of the samples of the first sequence).

As a result, the output of each multiplier 11-14 from the first group, depending on the form of a second given function of the counts form (i - serial number of the digital readout information, i=0, 1... n-1) analog signal type

.

The output of each element 19-22 delay following the multiplier 11 to 14 of the first group, the analog signal with a given phase shift to a value from 0 to (n-1)will be determined by the expression


The output of each multiplier 15-18 second group form the analog signal of the form

The output element 23-26 delay following the multiplier products 15-18 second group of the analog signal with a given phase shift to a value from 0 to (n-1)will be determined by the expression



At the output of the shaper 28 second envelope a2(x) is described by the following expression:


In the last two expressions, irrespective of the type specified function of the samples in the reference points x=ithe envelope of the a2(x) has the following values: a2(x)=And20for i=0, a2(x)=And21for i=1,..., a2(x)=A2n-1for i=n-1.

At the output of the adder 29 allocate the total analog signal and1(x)+a2(x), in which the reference points of the first analog signal takes on the value of the first envelope, and served in blocks 30-33 for the implementation of single-sideband modulation to transfer the total analog signal and1(x)+a2(x) on the carrier frequency f0. For this purpose, the total analog signal and1(x)+a2(x) is fed directly to the first output of the multiplier 31 and through a quadrature phase shifter 30 to the second output of the multiplier 32. In the multiplier products 31 and 32 perform direct multiplication and cavity, then the results of the multiplication of the sum output of adder 27 and serves formed the total analog signal to a communication line.

Adopted at the receiving side (Fig.3) the total analog signal passes the units 34-39, which perform the conversion, the reverse of which was carried out in blocks 30-33 on the transmission side. I.e. adopted total analog signal passes directly through the quadrature phase shifter 34 respectively on the first and second input multiplier products 35 and 36, the reference inputs which serve the same quadrature reference oscillations of the carrier frequency f0that and the multiplier products 31 and 32 on the transmission side.

As a result, the outputs of the first and the second input of multiplier products 35 and 36 form the quadrature components of the received total analog signal.

These quadrature components are subtracted in myCitadel 37, the output of which is a digital filter with impulse response defined by the expression (3), if the generator 9 second given function of the samples forms the function of the form (3). At the output of vicites with a digital filter to form an analog signal and1CR(x)+a2CR(x) whose components on the generator 9 second specified function counts generates the specified function of the samples of the form (4), output vicites 37 filter is not needed. Then output vicites 37 form an analog signal and1CR(x)+a2CR(x), quadrature components which are described by the same expressions as components and1(x)+a2(x), at the output of the adder 29 on the transmission side (Fig. 2).

From this total analog signal by the selector 38 clock frequency emit a signal with a clock frequency (sampling frequency on the transmission side), which is used for clocking the first 39 and 42 of the second analog-to-digital converters (ADC), and clocking both ADCS operate in antiphase. From the output of the first ADC 39 receives the value of the analog signal and1CR(x) in moments the clocking of the digital samples of the first information sequence, i.e. those points that correspond to points of reference digital samples of the first information sequence on the transmitting side. These digital samples of information are transferred to the output 43 in the form of a source of the first sequence of digital samples of information And1irestored by discretization of the total analog signal clock frequency.

Found on the recovered first pos.preobrazhenie using the specified function samples the analog signal and1CR(x) the first sequence, which is then fed to the second input of vicites 40, to the first input of which receives the total analog signal and1CR(x)+a2CR(x), from the output of the adder 37. In myCitadel 40 analog signal and1CR(x) the first sequence is subtracted from the total analog signal and1CR(x)+a2CR(x), resulting in output vicites 40 form a differential analog signal representing the analog signal and2CR(x) in which the reference points x=ihas the following values: a2CR(x)=And20for i= 0, and2CR(x)=And21for i=1,..., and2CR(x)=A2n-1for i=n-1. This analog signal is fed to the input of the second ADC 42, which takeroot inverted clock frequency (i.e., shifted in phase byrelative to the signal on the clock input of the first ADC 39). The output of the second ADC after recovery from the received differential analog signal and2CR(x) receive a second sequence of digital samples inputenabled the first and second sequences of digital samples of information transmitted over the communication line without changing the settings of the last, i.e., implemented softening.

Therefore, the proposed method of information transmission provides transmission of at least two analog signals instead of one at the same time through the existing communication line, i.e., increases the speed of transmission of information, or the information content of the transmission line and receiving.

Industrial applicability
This invention can be used in communications technology, dimensions, and any other applications where it is necessary to transfer or transform the information. The proposed method provides faster transmission of information or informational content of the transmission channel.

Although the present invention is described with reference to a specific example of implementation, this example in no way limits the scope of patent claims, which is defined by the attached claims with regard to the possible equivalents.


Claims

1. The method of transmission of information, namely, that on the transmission side converts the first digital sequence samples the first analog signal by multiplication with the signal given fu is this analog signal from the communication line; restore from a received analog signal, the first sequence of digital samples, wherein on the transmission side converts the second digital sequence samples the second analog signal by multiplying the signal referred to a function specified times, with moments clocking times for the second sequence of digital samples have between clocking times for the first sequence of digital samples; a first analog signal obtained by converting digital samples, the values of which are equal to the difference between digital samples referred to the first sequence and the values of the second analog signal in moments clocking times you referred to the first sequence; summarize the first and second analog signals, then and transmit the generated total analog signal on the communication line; at the receiving side restores digital samples referred to the first sequence by sampling a received analog signal to a clock frequency; restored digital samples mentioned first sequence is converted into a first analog signal using a signal by mentioning ogopogo signal; restore digital samples mentioned second sequence from the received differential analog signal.

2. The method according to p. 1, characterized in that as a function of indications use

where x= 2Fin;
Finthe upper frequency in the spectrum of the signal being transmitted;
n is the number of frequency components.

3. The method according to p. 1, characterized in that as a function of indications use

where x= 2Fin;
Finthe upper frequency in the spectrum of the signal being transmitted;
n is the number of frequency components;
k - a positive integer that characterizes the degree of truncation functions.

 

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1 cl, 2 dwg

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