KR101292642B1 - Communication method for high reception sensitivity and low cost, and communication device using it - Google Patents

Abstract

PURPOSE: A high-sensitivity and low-cost data communications method and device are provided to significantly reduce the complexity of a digital signal processing block and to easily restore data with high sensitivity. CONSTITUTION: A high-sensitivity and low-cost data communications device includes an intermediate frequency (IF) down-conversion part (22), a correlation part (23), a binary sequence generation part (24), an analog-to-digital (A/D) conversion part (25), and a received signal decoding part (26). The IF down-conversion part receives a signal and converts it into an IF signal. The binary sequence generation part generates a binary sequence having a chip cycle with a different size from the chip cycle of a binary sequence applied to the received signal. The correlation part converts the binary sequence into an IF signal, performs analog multiplication for the IF signal and the IF signal of the received signal, performs analog integration for the result of the multiplication, and then generates a correlation signal. The A/D conversion part performs A/D conversion of the correlation signal based on a correlation peak detected from the correlation signal. The received signal decoding part restores original data by using the data obtained from the A/D conversion. [Reference numerals] (10) Transmitting device; (11) Transmitted data encoding part; (12) Binary sequence generation part; (13) RF up-conversion part; (20) Receiver; (22) IF down-conversion part; (23) Correlation part; (232) Filter part; (233) IF up-conversion part; (24) Binary sequence generation part; (25) A/D conversion part; (26) Received signal decoding part; (AA,GG) Clock; (BB) Sequence control signal; (CC) Data; (DD) Channel; (EE) IF I signal; (FF) Data; (HH) Sequence control signal; (II) IF Q signal

Description

High Sensitivity Low Cost Data Communication Method and Communication Device {COMMUNICATION METHOD FOR HIGH RECEPTION SENSITIVITY AND LOW COST, AND COMMUNICATION DEVICE USING IT}

According to the present invention, a correlation method for separating a weak information signal from a mixed signal is performed in an analog signal processing block, and a correlation signal can be easily obtained even if a signal of a binary string does not coincide with a symbol period. In addition, the present invention relates to a high-sensitivity low power data communication method and communication apparatus capable of implementing a low-cost receiver according to the simplification of a digital signal processing block and a high-sensitivity receiver according to a high reception sensitivity.

The data communication apparatus has a limitation in reception sensitivity, so that the reliability of communication is poor when a signal is received at a poor communication environment or at a point far from the transmitter.

As a part of improving reception sensitivity, there is a communication method using a pseudo random number (PN) binary code. According to this, the transmitting side codes and transmits data using a PN (Pseudo Random Number) binary code previously promised with the receiving side, and the receiving side restores the data by a correlation technique using the same PN binary code. Here, the pulse rate of the PN binary code is at least several tens of times higher than the symbol of the data.

However, a communication method using such pseudo random number (PN) binary code has to implement an expensive digital signal processing block as data is recovered from a digital signal processing block by a correlation technique. In other words, in order to increase the reception sensitivity, the length of the PN binary code must be increased. However, the chip period of the PN binary code is relatively short compared to the period of the data symbol, so that the digital signal must be processed at high speed. There is also a problem that the transmission rate is also lowered. Moreover, as the clock frequency is increased and processed at high speed, power consumption also increases.

As a conventional technique for solving such a problem, Korean Patent Publication No. 10-1998-045009 applies a correlation technique in the analog signal processing domain, and Korean Patent Publication No. 10-2007-0044353 uses an analog correlation technique as UWB ( Ultra_Wide_Band) is applied to communication method.

However, the above-described prior arts are difficult to detect data unless the PN binary code is correctly synchronized to a signal in the analog signal processing region. Accordingly, additional signal processing blocks are needed to synchronize the signals.

On the other hand, in the data reception method using the correlation technique, if the length of the PN binary code is increased, the reception sensitivity is high but the transmission rate is low. Therefore, the transmission rate and reception sensitivity should be easily adjusted to an appropriate value according to the communication environment.

KR 10-1998-045009 A 1998.09.15. KR 10-2007-0044353 A 2007.04.27.

Accordingly, an object of the present invention is to implement the correlation technique in the analog signal processing block to reduce the burden of the digital signal processing block, and to show the maximum correlation even if the PN binary code is not accurately synchronized to the received signal, the configuration of the receiver To provide a high sensitivity low cost data communication method and communication device that simplifies the power consumption, reduces power consumption, and maintains high reception sensitivity.

The present invention also provides a high sensitivity low cost data communication method and communication apparatus which can be easily set to have the required transmission rate and reception sensitivity.

In accordance with another aspect of the present invention, there is provided a high-sensitivity low-power data communication method, comprising: a transmitting step (S10) carried on a carrier wave after performing an encoding step of applying a binary string signal every symbol period of transmission data; And a reception / demodulation step (S21) of receiving a signal and converting it into an IF signal, a binary signal generation step (S22) of generating a binary string used in the transmission step (S10) and converting it into an IF signal, and a received signal. Correlation signal generation step (S23) of generating a correlation signal by analog multiplying the IF signal of the binary sequence by an analog multiplication after the IF signal of A, and A / D conversion based on a correlation peak detected in the correlation signal. A receiving step (S20) including an A / D conversion step (S24) and a data obtaining step (S25) of restoring transmission data from the A / D converted digital data; The binary string is a binary code obtained by repeating a plurality of times of unit binary strings in which chips of bits are successively set in advance, and the binary string generated in the binary string signal generation step (S22). The IF signal may be generated to have a chip period having a different size from the chip period of the binary string applied to the received signal.

The transmitting step (S10) and the receiving step (S20), using the same binary string, by adjusting the length of the unit binary string, the number of unit binary strings, or the chip period to adjust the reception sensitivity and transmission rate, the reception step In the data acquisition step (S25) of (S20), by changing the chip period of the binary string generated in the binary signal generation step (S22) to verify the restored data by setting the chip period to ensure that the data is restored normally Characterized in that the period setting step is further performed.

The receiving step (S20) IQ demodulates the received signal in the receiving / demodulating step (S21) and uses the same binary string signal generated in the binary string signal generation (S22) to perform I and Q signals by IQ demodulation. The correlated signal generating step (S23) and the A / D conversion step (S24) are respectively performed on the basis of the original data in the data obtaining step (S25) based on the data extracted from the I signal and the data extracted from the Q signal. It is characterized by.

The transmitting step S10 converts the transmission data into a plurality of parallel data, matches each symbol of the parallel data with a plurality of binary strings having mutual orthogonality one-to-one, encodes them, adds them together, and transmits them to the carrier wave. S20 performs the binary string generation step S22, the correlation signal generation step S23, and the A / D conversion step S24 for each of the plurality of binary strings used in the transmission step S10, thereby obtaining the data. In operation S25, original data is obtained based on digital data obtained for each binary string.

In addition, the present invention is a communication apparatus for receiving a transmission signal of a transmitting apparatus carrying a binary-encoded signal on a carrier for each symbol period of data and transmitting the recovered signal, and converting the signal into an IF signal. Down-conversion unit 22; A binary string generator 24 for generating a binary string; A correlator 23 for converting a binary string into an IF signal and then analog multiplying the IF signal of the received signal and performing analog integration to generate a correlation signal; An A / D conversion unit 25 for performing A / D conversion based on a correlation peak detected in the correlation signal; And a received signal decoding unit 26 for restoring data to data obtained by A / D conversion.

The binary string is a binary code obtained by repeating a unit binary string in which chips of bits are continuously connected a predetermined number of times, and the binary string generator 24 is a chip of a binary string applied to a received signal. It generates a binary string to have a chip period of a different size from the period).

The reception signal decoding unit 26 sets a chip period such that the restoration of the data is normally performed by verifying the restored data by varying the chip period of the binary string generated by the binary string generator 24. .

The IF down converter 22 demodulates the received signal into an IQ signal in the IF signal region, and the correlator 23 and the A / D converter 25 generate the binary string generator 24. The same binary string is used to separate the I and Q signals for signal processing, and the received signal decoding unit 26 restores the data transmitted from the transmitting apparatus from the data obtained from the I signal and the data obtained from the Q signal. It is characterized by.

The received signal received from the transmitting apparatus is a signal that is converted into a plurality of parallel data, the symbols of the parallel data are matched with a plurality of binary strings having mutual orthogonality one-to-one, encoded, summed, and then transmitted by a carrier wave. And a plurality of signal processing blocks comprising the binary string generator 24, the correlator 23, and the A / D converter 25, and demodulating the IQ signal demodulated by the IF down converter 22. The data is transmitted to the correlation unit 23 of each signal processing block, and the data of the IQ signal obtained from the A / D conversion unit 25 of each signal processing block is transferred to the received signal decoding unit 26 to restore the data. However, the binary string generators 24 provided one by one in the signal processing block share a plurality of binary strings used in the transmitter to generate binary strings that are orthogonal to each other.

According to the present invention as described above, since the sampling period for restoring data by performing the correlation technique in the analog signal processing block can be made larger than the chip period of the binary string, the complexity of the digital signal processing block can be greatly reduced, It is possible to easily restore the data with high sensitivity because the binary sequence is composed of a repeating unit binary sequence and the chip period is varied on the receiving side to maximize the correlation.

In addition, the present invention can control the data rate and the reception sensitivity using the length of the unit binary string, the number of unit binary strings or the chip period, it can be adjusted to the optimum conditions than simply adjusting the length of the binary string.

1 is a block diagram of a high sensitivity low power data communication apparatus according to a first embodiment of the present invention;
2 is a view for explaining a process of generating a transmission signal.
3 is a view for explaining a process of generating a correlation signal from a received signal.
Figure 4 is a block diagram of a high sensitivity low power data communication apparatus according to a second embodiment of the present invention.
5 is a flow chart of a high sensitivity low power data communication method according to an embodiment of the present invention.
6 is a flowchart showing a process of generating a binary string signal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, in the drawings, the same reference numerals are used to denote the same or similar components in other drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a block diagram of a high sensitivity low power data communication apparatus according to a first embodiment of the present invention, FIG. 2 is a view for explaining a generation process of a transmission signal, and FIG. It is a figure for demonstrating.

Referring to FIG. 1, a high-sensitivity low power data communication apparatus according to a first embodiment of the present invention includes a transmitter 10 for transmitting a transmission signal in which a binary string is applied to a symbol of transmission data and a transmitter for receiving a transmission signal. And a receiving apparatus 20 for extracting the transmission data sent from the numeral 10. In order to explain the present invention, the transmitting apparatus 10 and the receiving apparatus 20 which are separated from each other in space are illustrated, but the present invention also incorporates the transmitting apparatus 10 and the receiving apparatus 20 so as to enable transmission and reception. In addition, it is possible to use the receiving device 20 alone for receiving a signal from a previously installed transmitting device.

First, since the transmission device 10 is a configuration employed in a general communication device, it will be schematically shown and briefly described as shown in FIG. The transmitter 10 adds a binary string to a symbol of transmission data so as to be able to recover data by a correlation technique at a receiving side, and synthesizes the binary string to transmission data. To this end, the transmitter 10 includes a transmission data encoding unit 11, a binary string generator 12, and an RF up-conversion unit 13, and also includes an antenna 14 for transmitting an RF signal. do.

The binary string generator 12 is a block that is controlled by the transmission data encoding unit 11 to generate a binary string. The binary string generated here is a pseudo random number (PN) binary code.

According to the present invention, the binary string is a binary code obtained by repeating a unit binary string consisting of a PN code by a predetermined number of times and connecting each binary string to repeat a unit binary string in which chips of bits are continuously connected. It is formed in the form, and is transmitted to the transmission data encoding section 11 in a sequence of pulses. Accordingly, the total length of the binary sequence is determined by the length of the unit binary string and the number of unit binary strings, and is combined according to the symbol period (or length on the time axis) of the transmission data by the transmission data encoding unit 11. In a signal in which a symbol and a binary string of transmission data are combined, a period of a chip (a pulse width or a frequency of occurrence of a chip) on a time axis varies according to the length of a unit binary string and the number of unit binary strings.

Here, the length of the binary string and the period of the chip on the time axis dominate the reception sensitivity and data rate. Specifically, the longer the binary string, the lower the data rate but the better the reception sensitivity, and the longer the period of the chip, the data Since the transmission rate is reduced but the reception sensitivity is improved, the length of the binary string and the period of the chip need to be set to an appropriate value according to the communication environment. The pattern of the unit binary string, the length of the unit binary string, the number of unit binary strings, and the chip period are controlled and determined by the transmission data encoding unit 11. In addition, the binary string thus determined is previously promised between the transmitting side and the receiving side so that the pattern of the unit binary string, the length of the unit binary string, the number of unit binary strings, and the number of unit binary strings are equally used except for the chip period.

The transmission data encoding unit 11 instructs the binary string generation unit 12 to generate a binary string of a type set by setting a pattern of a unit binary string, a length of a unit binary string, a number of unit binary strings, and a chip period. It receives the binary string by transmitting the time of occurrence of the binary string as a clock signal. At this time, when the binary string is generated, the binary string output from the binary string generator 12 is turned on / off in accordance with the data to be transmitted. The transmission data encoding unit 11 performs an encoding process of applying a signal of a binary string to each symbol period of the transmission data.

The signal generated by the transmission data encoding unit 11 will be described with reference to FIG. 2 as follows.

On the time axis, the signal of the data to be transmitted is a signal in which the symbols are followed by the symbol signal period (or length, Ts) as shown in (a) of FIG. 2, and the signal of the binary string is the signal period (Ts) of the symbol as shown in (b) of FIG. Binary strings having the same signal period (Tpn) as shown in Fig. 1) are formed, and the unit binary string of the binary string is repeated for each unit binary string signal period Tpn1 and the chips forming the unit binary string are the chip signal period Tc. It has a form leading to). The transmission signal obtained by multiplying the binary string signal by the signal of the transmission data can be schematically illustrated as shown in FIG.

On the other hand, the transmission data encoding unit 11 is ON when only the symbol to be transmitted is "1" in a symbol of "0" or "1", and outputs only the symbols of "1" by combining a binary string. do.

The RF up-conversion unit 13 loads the signal generated by the transmission data encoding unit 11 on a radio frequency (RF) signal, which is a carrier wave, and transmits the signal using the antenna 14.

The receiver 20 receives the signal transmitted from the transmitter 10 through a channel to restore original data. For this purpose, the receiver 21 receives the signal and receives the received RF signal from the IF (Intermediate). IF downconverter 22 for demodulating into I / Q (in-phase / quadrature-phase) signal in the signal area, binary string generator 24 for generating binary strings, and binary signal in the IF signal region A correlation unit 23 for generating a correlation signal by multiplying the I signal and the Q signal, respectively, an A / D conversion unit 25 for converting the correlation signal for the I signal and the correlation signal for the Q signal into digital signals, respectively; And a received signal decoding section 26 for restoring original data based on the digital signal.

Here, the antenna 21, the IF down converter 22, the A / D converter 25 and the received signal decoding unit 26 are generally known in the art to which the present invention pertains. Omitted and briefly described only when necessary at a level that helps to understand the description of the correlation unit 23 and the binary string generator 24.

The binary string generator 24 is a block for generating a binary string identical to the binary string generated by the binary string generator 12 of the transmitter 10, as previously described with the transmitter. A binary sequence in which a unit binary string is repeated is generated and transmitted to the correlation unit 23 as a pulse signal. However, the binary string generator 24 on the receiving side has a different size than the chip cycle of outputting the chip period (pulse width or frequency of chip generation) on the time axis from the binary string generator 24 of the transmitter 10. To have.

In this way, by generating a binary string signal having a different chip period from the transmitting side, the signal length of the binary string generated at the receiving side and the binary string generated at the transmitting side are different from each other when viewed on the time axis. Even if the position is not exactly matched, a unit binary string section having a high correlation occurs for each symbol.

Meanwhile, although one binary string is formed of four unit binary strings in the accompanying drawings 2 and 3 to describe an embodiment of the present invention, the number of unit binary strings constituting the binary string is a section in which a correlation is large. To ensure this always occurs, set the appropriate number according to the communication environment.

The binary string generator 24 sets the pattern of the unit binary string, the length of the unit binary string, the number of unit binary strings, and the chip period according to the command of the received signal decoding unit 26 to successively connect the binary string signal. Occurs.

The correlator 23 is a block for generating a correlated signal by correlation between a received signal and a binary string signal. The correlator 23 processes a signal in an IF signal region, which is an analog signal region, and outputs the binary string generator 24. An IF up-converter 233 for up-converting the binary signal in the form of a pulse to an IF signal, a multiplier 231 and a multiplier 231 for multiplying the IF signal of the binary string by the I and Q signals of the received signal, respectively And a filter unit 232 for filtering the signal obtained by multiplying by. The multiplier 231 and the filter unit 232 demodulate the received signal into IQ and Q signals and separately process the signals, and thus are provided for I signal processing and Q signal processing, respectively. In addition, the filter unit 232 is configured as an analog filter and is a component for analog integral processing of the signal output from the multiplier 231, and preferably a low pass filter (LPF: Low-Pass Filter), The window size (or the length of the filter) is determined to optimally generate a correlation peak according to the length of the unit binary string.

An IF signal processed by the correlator 23 will be described with reference to FIG. 3.

Referring to a and b of FIG. 3, since the IF signal of the received signal is a signal multiplied by a binary string in accordance with a symbol period Ts by the transmitting side as described above, each symbol included in the received signal has a period. The signal multiplied by the unit binary string having Tpn1 has a form of repeating. The chip period of the unit binary string multiplied by the received signal has a Tc value as described with reference to FIG. 2.

Next, referring to c and d of FIG. 3, the IF signal of the binary string generated by the binary string generator 24 of the receiver 20 and converted into the IF up-converter 233 is a chip as described above. Since the period Tc 'has a different size than the chip period Tc of the transmitting binary string, the period (or length) Tpn1' of the unit binary string is not the same as the period Tpn1 of the transmitting unit binary string, and the period Tpn 'of the binary string also includes Not equal to the cycle Tpn.

가 발생한다.
In the embodiment of the present invention, since the chip period Tc 'of the receiving side is made smaller than the chip period Tc of the transmitting side, a gap between the binary strings is generated when the binary string is generated in accordance with the period Tpn'.

Occurs.

As described above, when the receiver generates a binary signal and multiplies the received signal to generate a correlation signal, even when the binary string is multiplied by the symbol of the received signal as shown in FIG. Interval of unit binary string occurs with large correlation. Accordingly, analog integration of the correlation signal into the filter unit 232 generates a correlation peak in a section where the correlation is large as shown in FIG. In other words, the time of generation of the binary string is matched to the time of receiving the signal to generate the correlation signal, but it is difficult to generate the correlation signal exactly to the starting point of the symbol. However, according to the present invention, since a plurality of unit binary strings are set and a chip period different from the transmitting side, a correlation peak can be obtained for each symbol even if the starting point of the binary string and the starting point of the symbol are not exactly matched.

In this way, digital data based on the correlation peak can be obtained by A / D conversion of the correlation signal where the correlation peak has occurred, and the received signal decoding unit 26 according to the data obtained from the correlation signal of the I signal and the data obtained from the correlation signal of the Q signal. ), The original transmission data can be restored.

In describing the embodiment of the present invention, it has been described that the chip period Tc 'on the receiving side is made smaller than the chip period Tc on the transmitting side. If the chip period Tc 'of the receiving side is made larger than the chip period Tc of the transmitting side, the period of the binary string is larger than the symbol period Ts, and the binary string is always combined across the front and back symbols, but the binary string is a plurality of unit binary strings. Since a correlation peak always occurs in each symbol.

As such, in order to generate a correlation peak in each symbol, it is necessary to appropriately set the length of the unit binary string, the number of unit binary strings, and the chip period.

In addition, the received signal decoding unit 26 verifies the data to be restored in transmitting the command of the pattern of the unit binary string, the length of the unit binary string, the number of unit binary strings, and the chip period to the binary string generator. The chip period can also be adjusted to recover data without error.

On the other hand, in the above description, a correlation peak occurs in each symbol, but a correlation peak occurs in a symbol of "1" on the receiving side, and a symbol of "1" is detected, and in a symbol of "0", a reception signal containing noise is mixed. Since the binary number string, which is the PN code, is multiplied, it is obvious that a symbol of "0" can be detected because a peak does not occur in a mixed state of noise.

4 is a block diagram of a high sensitivity low power data communication device according to a second embodiment of the present invention.

The second embodiment of the present invention shown in FIG. 4 uses binary strings having orthogonality in order to improve the data rate.

In other words, the transmitter 10 'includes N binary string generators 12-1, 12-2, ..., 12-N which generate binary strings each having orthogonality to each other. In addition, the transmission data encoding unit 11 of the transmission apparatus 10 converts the data to be transmitted into N data symbols in parallel and generates a signal to which a binary string is applied by matching binary strings one-to-one to data symbols of each column of parallel data. After summing the signals generated for each column, the signals are transmitted as RF signals using the RF up-conversion unit 13 and the antenna.

Next, as in the first embodiment of the present invention, the receiving device 20 'includes the antenna 21, the IF downconversion / IQ demodulation 22, the correlator 23, and the A / D converter 25. And a binary string generator 24 and a received signal decoder 26, wherein the binary signal generator 24, the correlator 23, and the A / D converter 25 are N-signal processing blocks. Dogs.

The I and Q signals of the IF down conversion unit 22 are equally transmitted to the correlation unit 23 provided for each signal processing block and multiplied by the binary string signal generated by the binary string generation unit 24 in the signal processing block. The signal is converted into a correlation signal, converted into digital data by the A / D converter 25, and transmitted to the received signal decoder 26. Further, each of the binary string generators 24-1, 24-2, ..., 24-N is a binary string generator 12-1, 12-2, ..., 12-N of the transmitting side. Same as), generates a binary sequence having mutual orthogonality, but generates a binary sequence that makes the chip period different from the transmitting side. Here, each of the binary string generators 24-1, 24-2,..., 24 -N decodes a received signal by receiving a command of a pattern of a unit binary string, a length of a unit binary string, a number of unit binary strings, and a chip period. Received from the section 26 to generate a binary string, respectively, generates a binary string of the pattern orthogonal to each other.

As such, since the binary strings generated by the binary string generators 24-1, 24-2,..., And 24 -N have mutual orthogonality, correlation peaks are generated only for signals having the same binary string as their own. Since the receiving apparatus 20 'can obtain data symbols of N columns, the receiving signal decoding unit 26 combines the digital data received from each signal processing block to restore the original data transmitted from the transmitting side. can do.

In this way, by using orthogonal binary strings, the data rate can be improved by N times.

Next, a high sensitivity low power data communication method comprising the data communication apparatus according to the first and second embodiments of the present invention will be described.

5 is a flowchart of a high sensitivity low power data communication method according to an exemplary embodiment of the present invention, and FIG. 6 is a flowchart illustrating a process of generating a binary string signal.

5 and 6, in the high sensitivity low power data communication method according to an exemplary embodiment of the present invention, a transmission step (S10) by the transmission device (10, 10 ') and reception by the reception device (20, 20') are performed. Step S20 is made.

The transmitting step (S10), a binary string generation step (S11) for generating a binary string in accordance with the symbol period of the data to be transmitted, an encoding step (S12) for multiplying by applying a binary string to the data to be transmitted, and the encoded data Transmitting a modulated signal to an RF signal through an antenna (S13).

As described above with reference to FIG. 2, the binary string is composed of a binary code obtained by repeating a unit binary string of a PN code format in which chips of bits are continuously connected for a predetermined number of times, and transmitting data encoding. The binary string generator 12 operating according to the instruction of the unit 11 is generated by setting the pattern of the unit binary string, the length of the unit binary string, the number of iterations of the unit binary string, and the chip period, and matching the generation point of the binary string to the symbol period. . In addition, the length of the unit binary string, the repetition frequency of the unit binary string, and the chip period are adjusted appropriately according to the reception sensitivity and the transmission rate.

The receiving step (S20), a receiving / demodulating step (S21) for receiving a signal transmitted from the transmitting device and converting it into an IQ signal in the IF signal region, and generating a binary string and converting the generated binary string to an IF signal A binary signal generation step (S22) and a correlation signal generation step (S23) of generating a correlation signal having a correlation peak by analog multiplying the IF signal of the binary number by the IF signal of the received signal and passing through an analog integrator. And an A / D conversion step (S24) for A / D conversion based on the correlation peak detected in the correlation signal, and a data acquisition step (S25) for restoring original data from digital data obtained by the A / D conversion. Include.

In the binary signal generation step (S22), to be described in detail, the binary string generator 24 generates a unit binary string (S231), and generates a binary string by periodically generating a unit binary string by a predetermined number of iterations. Afterwards (S232), the IF up-converter 233 of the correlation unit 23 converts the binary string into an IF signal (S232).

The binary string generated in the binary string signal generating step S22 is the same as the binary string used in the transmitting step S10, but the chip period is different. Accordingly, even if the IF signal start point of the binary string and the IF signal start point of the received signal do not coincide in the correlation signal generating step (S23), a unit binary string having a high correlation is generated in the symbol to obtain a correlation peak. .

In addition, the correlation signal generation step S23 and the A / D conversion step S24 obtain a correlation signal for the I signal and the Q signal by using the IF signal of the same binary string, and obtain the correlation signal of the I signal and the Q signal. The digital data of the I signal and the digital signal of the Q signal are obtained by A / D conversion, respectively, and the received signal decoding unit 26 restores the original data based on the digital data of the I signal and the digital data of the Q signal.

On the other hand, the data acquisition step (S25) preferably performs a chip period setting step. The chip period setting step is a step of adjusting the chip period so that the correlation degree appears to be the maximum value, verifying the restored data by varying the chip period of the binary string generated by the binary string generator 24 to restore the data normally It is a step of setting the chip cycle to make.

According to an embodiment of the present invention, a communication method using a plurality of binary strings having orthogonality is also possible.

At this time, the transmission step (S10), converts the original data to be transmitted to N parallel data symbols, and matched and multiplied a plurality of binary strings orthogonal to the symbols of the data listed in parallel one by one, multiply the RF signal Modulate and transmit.

And, the receiving step (S10), the binary string generation step (S22), the correlation signal generation step (S23) and A / D for the I / Q signal generated in the reception / demodulation step (S21) for each of a plurality of binary strings The conversion step S24 is performed to obtain digital data for each binary string in the I / Q signal. Then, based on the digital data obtained for each binary string, the original data is acquired in the data acquisition step S25.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10: transmitting device
11: transmission data encoding unit 12: binary code generator
13: RF up converter 14: antenna
20: receiver
21 antenna 22 IF down converter
23: correlation unit 231: multiplication unit
232: filter unit 233: IF up converter
24: binary code generator 25: A / D conversion unit
26: reception signal decoding unit
Ts: Signal period of symbol
Tpn: Binary string signal cycle at sending side
Tpn ': Binary string signal cycle at receiving side
Tpn1: Unit Binary String Signal Period at Sending Side
Tpn1 ': Unit binary string signal cycle at receiving side
Tc: Chip signal cycle of transmitter
Tc ': Chip signal cycle at receiving side
Correlation Peak: Section where correlation peak occurs

Claims (8)

A transmission step (S10) of carrying on an carrier after performing an encoding step of applying a signal of a binary string for each symbol period of transmission data; And
A reception / demodulation step (S21) of receiving a signal and converting it into an IF signal, a binary signal generation step (S22) of generating a binary string used in the transmission step (S10) and converting it into an IF signal, and a received signal Correlation signal generation step (S23) of generating a correlation signal by analog multiplying the IF signal of the binary sequence with an analog signal to an IF signal, and performing A / D conversion based on a correlation peak detected in the correlation signal. A receiving step (S20) including an A / D conversion step (S24) and a data obtaining step (S25) of restoring transmission data from the A / D converted digital data; Lt; / RTI >
The binary string is,
It is a binary code that repeats a unit binary sequence in which chips of bits are continuously connected a plurality of times.
IF signal of the binary string generated in the binary string signal generation step (S22),
A high sensitivity low power data communication method characterized by being generated to have a chip period of a different size from the chip period of the binary string applied to the received signal. The method of claim 1,
The transmitting step (S10) and receiving step (S20),
Use the same binary string, but adjust the reception sensitivity and transmission rate by adjusting the length of the unit binary string, the number of unit binary strings, or the chip period.
The data acquiring step (S25) of the receiving step (S20), by varying the chip period of the binary string generated in the binary signal generation step (S22) by verifying the restored data by performing a chip period so that the restoration of the data is normal A high sensitivity low power data communication method characterized by further performing a chip cycle setting step. 3. The method according to claim 1 or 2,
The receiving step (S20),
IQ demodulates the received signal in the receiving / demodulating step (S21),
By performing the correlation signal generation step (S23) and the A / D conversion step (S24) for the I and Q signals by IQ demodulation using the same binary signal generated in the binary string signal generation (S22), respectively. And obtaining raw data in the data acquisition step (S25) based on the data extracted from the I signal and the data extracted from the Q signal. The method of claim 3,
The transmitting step (S10),
Converts the transmission data into a plurality of parallel data, matches each symbol of the parallel data with a plurality of binary strings having mutual orthogonality one-to-one, encodes, sums them, and transmits them to the carrier wave;
The receiving step (S20),
The data acquisition step S25 is performed by performing the binary string generation step S22, the correlation signal generation step S23, and the A / D conversion step S24 for each of the plurality of binary strings used in the transmission step S10. High sensitivity and low power data communication method, characterized in that to obtain the raw data based on the digital data obtained for each binary string. A communication apparatus for receiving data and recovering data by receiving a transmission signal of a transmission apparatus carrying a signal encoded with a binary string on a carrier for each symbol period of data,
An IF down converter 22 for receiving a signal and converting the signal into an IF signal;
A binary string generator 24 for generating a binary string;
A correlator 23 for converting a binary string into an IF signal and then analog multiplying the IF signal of the received signal and performing analog integration to generate a correlation signal;
An A / D conversion unit 25 for performing A / D conversion based on a correlation peak detected in the correlation signal;
A reception signal decoding section 26 for restoring data to data obtained by A / D conversion;
, ≪ / RTI >
The binary string is a binary code obtained by repeating a unit binary string in which chips of bits are continuously connected a plurality of times.
The binary string generator 24 generates a binary string to have a chip period having a different size from the chip period of the binary string applied to the received signal. 6. The method of claim 5,
The receiving signal decoding unit 26 sets the chip period so that the restoration of the data is normally performed by verifying the restored data while varying the chip period of the binary string generated by the binary string generator 24. High sensitivity low power data communication device. The method according to claim 5 or 6,
The IF down converter 22 demodulates the received signal into an IQ signal in the IF signal region,
The correlator 23 and the A / D converter 25 separate and signal-process an I signal and a Q signal using the same binary string generated by the binary string generator 24,
The receiving signal decoding section (26) recovers the data transmitted from the transmitting apparatus from the data obtained from the I signal and the data obtained from the Q signal. 8. The method of claim 7,
Received signal received from the transmitter,
A signal that is converted into a plurality of parallel data, each symbol of the parallel data is matched with a plurality of binary strings having orthogonality in one-to-one order, encoded, summed, and then transmitted by a carrier wave,
A plurality of signal processing blocks consisting of the binary string generator 24, the correlator 23, and the A / D converter 25 are provided, and each of the IQ signals demodulated by the IF down converter 22 is respectively provided. The data of the IQ signal obtained from the A / D converter 25 of each signal processing block to the received signal decoder 26 to restore the data. But
High-sensitivity low-power data communication device characterized in that the binary string generators (24) provided in the signal processing block one by one share a plurality of binary strings used in the transmission device to generate a binary string orthogonal to each other.

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