KR101206151B1 - Body communication network system using modified hermite polynomial pulse and ternary code for out-body wban - Google Patents

Abstract

In order to alleviate the interference caused by the multiple access and improve the transmission efficiency, the present invention discloses a multi-access technique for external high speed and low speed communication using Modified Hermite Polynomial (MHP) pulses and ternary codes. Generating a ternary code and MHP pulse signal for ultra-wideband wireless communication in a human body short-range communication network, and transmitting the generated ternary code and MHP pulse signal in a user-selected ternary code sequence and MHP pulse order A transmitting device and a receiving device for receiving the signals sent in each sequence and the MHP pulse order, and identifying the MHP pulse order and ternary code of the signal using correlation detection, wherein the receiving device uses the detected signals It is characterized by detecting a signal between users.

Description

Human body communication network system using MPH pulse and ternary code in external body communication {BODY COMMUNICATION NETWORK SYSTEM USING MODIFIED HERMITE POLYNOMIAL PULSE AND TERNARY CODE FOR OUT-BODY WBAN}

The present invention relates to a multiple access scheme of high-speed and low-speed communication outside the body using MHP pulses and ternary codes to mitigate interference occurring in multiple accesses and to improve transmission efficiency. The present invention relates to a multiple access system using a ternary code to detect a multi-user signal and using an MHP pulse technique, a ternary code technique, and a time hopping technique.

Recently, as interest in IT-BT convergence technologies such as U-healthcare and ubiquitous has increased, research on WBAN (Wireless Body Area Network) system is being actively conducted. WBAN refers to wireless communication within 3 meters from and inside the human body based on the human body. In other words, it is a new type of wireless communication that interconnects medical devices implanted in the human body, clothes worn by humans, or various devices attached to the human body.

WBAN can be classified according to the application field and the location of the device.By categorizing the application field, it can be worn like clothes that measure blood pressure, blood sugar, and wireless communication, and bio-signal such as ECG, EMG, etc. It can be divided into the medical field, which is a biometric insertion BAN that measures and wirelessly communicates, and the non-medical field for video, audio, and mobile transmission. Depending on the location of the device, it can be classified into internal human body communication, human body surface communication, and external human body communication.

WBAN is a communication network requiring low power and high reliability communication because of short-range communication inside and outside the human body. In addition, external communication for audio and video transmission requires a transmission speed of 10Mbps or more. As such, the WBAN system requires not only low power but also a flexible transmission speed from 1 kbps to 10 Mbps, so that a UWB-IR method is emerging as a suitable communication system. UWB systems transmit in ultra-wideband using Pulse Position Modulation (PPM), which is simpler than sinusoidal transmissions that require mixers, RF oscillators and PLLs, and consumes low power with 1ns pulse transmission. Therefore, since the requirements of the WBAN system are met, researches are being actively conducted to apply to the physical layer of the WBAN in the academic and national research institutes, and the standardization of applying the PPM-type UWB technology in the IEEE 802.15.6 TG is almost the last. to be.

In the case of external body communication, communication is performed between many devices. As a result, interference problems between different devices occur, and multiple access methods between these multiple devices must be considered. As a near field wireless multiple access scheme in IEEE 802.15.4a, a time hopping PPM (TH-PPM) scheme has been proposed. In WBAN wireless communication, communication is within a very short distance (3m), so the distance between multiple devices is so close that interference problems occur.

The human body communication network system according to an embodiment of the present invention generates a ternary code and a pulse signal, transmits the generated ternary code based on a preselected ternary code sequence, and transmits the generated pulse signal A transmitting device for transmitting based on a pulse order, and receiving the transmitted ternary code and the transmitted pulse signal, and using the correlation detection, the predetermined pulse order from the transmitted ternary code and the transmitted pulse signal And a receiving device detecting the preselected ternary code sequence, wherein the receiving device may detect a signal between users using the detected preselected pulse order and the preselected ternary code sequence.

In a method of operating a human body communication network system, a transmitting apparatus generates a ternary code and a pulse signal, transmits the generated ternary code based on a preselected ternary code sequence, and transmits the generated pulse signal to a preselected pulse. Transmitting based on the order, at a receiving device, receiving the transmitted ternary code and the transmitted pulse signal and using correlation detection the preselected pulse from the transmitted ternary code and the transmitted pulse signal And detecting the order and the pre-selected ternary code sequence, wherein the receiving device may detect a signal between users using the detected preselected pulse order and the preselected ternary code sequence.

According to one embodiment of the present invention, it is possible to provide an ultra-wideband system that is simpler than sinusoidal transmission, has no interference, and consumes low power.

According to an embodiment of the present invention, a UWB technology using a wide frequency band and a multiple access system in a short-range communication network inside and outside the human body can be provided.

According to an embodiment of the present invention, in order to solve the multi-user interference problem occurring in the multi-access in a short-range communication system inside and outside the human body can provide a ternary code, MHP pulse technology having each orthogonality.

According to an embodiment of the present invention, by applying the ternary code, MHP pulse, time hopping techniques to improve the accuracy of the signal information when multiple access can provide an improved self-signal detection technique.

According to an embodiment of the present invention, it is possible to propose a multiple access scheme using MHP pulses and ternary codes in external communication.

According to an embodiment of the present invention, in the case of asynchronous high-speed transmission, the number of pulses to be transmitted is small so that a ternary code sequence can be added and a time hopping interval can be reduced, thereby making it possible to be strong in a channel environment and to reduce multiple access interference.

According to an embodiment of the present invention, in the case of synchronous high-speed transmission, the number of pulses to be transmitted may be increased in the channel environment by using at least the orthogonality of the MHP pulses to be strong in the channel environment and to reduce the multiple access interference.

According to an embodiment of the present invention, the multiple access method using the MHP pulse can provide more accurate communication than the method using the Gaussian pulse, and in case of asynchronous, the MHP pulse, the ternary code and the time hopping interval for sending one information. By using the communication can provide improved performance.

1 is a diagram illustrating a network of multiple access users in communication from the human body surface to the outside.
2 is a diagram illustrating a physical layer frame structure of human body communication for high speed and low speed transmission.
3 is a diagram illustrating a transmitter and a receiver of a human body communication network system according to an embodiment of the present invention.
4 is a diagram illustrating the performance of a multiple access scheme in asynchronous high speed transmission.
5 is a graph illustrating multiple access performance in synchronous fast transmission.
6 is a graph showing the performance as the number of multiple access users in synchronous fast transmission increases.
7 is a graph illustrating multiple access performance in synchronous slow transmission.
8 is a graph illustrating multiple access performance in asynchronous low speed transmission.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

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. The terminologies used herein are terms used to properly represent preferred embodiments of the present invention, which may vary depending on the user, the intent of the operator, or the practice of the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification. Like reference symbols in the drawings denote like elements.

1 is a diagram illustrating a network of multiple access users in communication from the human body surface to the outside.

Referring to FIG. 1, H is a hub of each network and receives and transmits signals of multiple nodes. N is each node to transmit and receive each signal on the human body surface.

As described above, the external communication of the human body is used in various fields such as video, audio, and data transmission services, and requires coverage that can be transmitted within 3 meters. Frequency bands are diverse, including ISM, UWB, and MICS.

Human body communication network systems also operate at or within close proximity to the human body, which places strict limits on radiated power. It should satisfy 10Mbps or higher communication rate and low power for video transmission, and up to 10 multi-access users.

2 is a diagram illustrating a physical layer frame structure of human body communication for high speed and low speed transmission.

은 약 1026ns이며 데이터 전송량 0.85Mbps를 지원한다. 한 심볼은 2PPM을 사용하며

은 512.8ns로 2구간으로 나뉘어 1 비트를 전송하게 된다.Referring to FIG. 2, in the case of low-speed transmission, a modulation method uses a PPM method that carries a position of a pulse. Indicating the period of the signal transmitting one bit

Is about 1026ns and supports data transfer rate of 0.85Mbps. One symbol uses 2PPM

Is 512.8ns divided into 2 sections and transmits 1 bit.

)은 약 64ns이며 데이터 전송량은 약 13Mbps가 된다. 저속 UWB의 심볼과 같이 이진 PPM 변조방식을 사용하며,

은 32ns으로 2 구간으로 나뉘어 1비트 전송하게 된다. 심볼 구간이 줄어들어

구간에는 1개의 칩으로 이루어지며 다중 접속을 위한 시간 도약 구간은 16개로 구성된다.Also, for high speed transmission of 10Mbps or more, the symbol symbol period is reduced by reducing the frame symbol period.

) Is about 64ns and the data transfer rate is about 13Mbps. It uses binary PPM modulation like symbols of low speed UWB,

Is divided into 2 sections with 32ns to transmit 1 bit. Symbol interval is reduced

The interval consists of 1 chip and 16 time jump intervals for multiple access.

The transmission signal of the PPM-based UWB system is shown in Equation 1.

[Equation 1]

이며 펄스가 위치하는

구간의 위치에 따라 0 또는 1을 나타낸다. Tf　는 하나의 프레임 구간을 나타내며

은 다중 접속을 위한 시간 도약 구간을 지정한다. Tburst　는 연집 펄스 구간이며 고속전송을 위한 WBAN 심벌 구조에서는 Tburst 구간에 하나의 펄스가 전송된다. Eb denotes bit energy and p (t) denotes Gaussian pulses transmitted. The bit information of the symbol

Where the pulse is located

0 or 1 depending on the position of the section. Tf represents one frame interval

Specifies a time hopping interval for multiple access. Tburst is a concatenated pulse interval. In the WBAN symbol structure for high-speed transmission, one pulse is transmitted in the Tburst interval.

사용자 신호를 나타낸다. Eb 는 비트 에너지, 단일시간도약 코드

의 길이

와 각 코드의 시간도약

로 구성되며

이다. 주어진 코드길이

와 각각의 시간도약

는

와 같이 구성된다.As such, the multiple access scheme according to the present invention uses a time hopping interval scheme and a ternary code technique. Equation 2 is based on the multiple access method

Indicates a user signal. Eb is bit energy, single time jump code

Length of

And time leap of each code

Consists of

to be. Given code length

And each time leap

The

It is composed as follows.

&Quot; (2) "

은 터너리 시퀀스의 non-zero 요소의 개수이며 모든 구성요소는 시간반복의 상호보안적인 세트로 구성된다. 상호 보안적인 터너리 쌍으로 구성된

으로 매트릭스

을 이룬다. In addition, in a human body communication network system of asynchronous system, ternary code is used to synchronize between different nodes and hubs. Equation 3 satisfies the periodic autocorrelation function

Is the number of non-zero elements of the ternary sequence and all components consist of a mutually secure set of time repetitions. Composed of mutually secure ternary pairs

By matrix

To achieve.

&Quot; (3) "

을 구성을 나타낸다.

는 시퀀스

의 역을 나타내며 -

는 시퀀스

에서 음의 i번째 요소를 나타낸다. 매트릭스

는 상호 직교의 특성을 가진 세트

와

으로 구성된다.Equation 4 is a matrix

Indicates the configuration.

Sequence

Represents the inverse of-

Sequence

Represents the i th element of the. matrix

Set with the characteristics of mutual orthogonal

Wow

.

&Quot; (4) "

는 상호 직교성을 가지는 시퀀스 세트

과

으로 구성된다. 각각의 사용자는 서로 다른 상호 직교의 터너리 코드 세트를 사용하여 신호를 구분하게 된다.Equation 5 is composed of mutually secure subunit ternary codes. '+' Represents 1 and '-' represents -1.

Is a set of sequences with mutual orthogonality

and

. Each user distinguishes between signals by using different sets of mutually orthogonal ternary codes.

[Equation 5]

In this way, when the code is extended using mutually orthogonal codes, Equation 6 is obtained.

&Quot; (6) "

는 매트릭스

의 i, j 항목의 역을 나타내며, '

'는 인터리빙(interleaving)을 나타낸다. 두 개의 시퀀스

와

가

이면

이다.here -

The matrix

Represents the inverse of items i and j in ',

'Represents interleaving. Two sequences

Wow

end

If

to be.

As such, each code in the present invention has excellent autocorrelation and cross-correlation properties. WBAN system has a lot of multipath delay and multi user interference, so it can mitigate multipath delay and multi user interference by using ternary sequence.

이다. 각 차수의 펄스는 동일한 1ns의 구간을 가지며 같은 주파수 대역폭을 가진다. 또한 서로간의 직교성을 가지고 DC성분이 없는 펄스로 구성된다.In addition, in the present invention, the MHP pulse having orthogonality can be used for more efficient signal separation between users. Equation 7 shows the equation of the MHP pulse. n is the order of the pulse, n = 0,1,2, ...

to be. Each order pulse has the same interval of 1 ns and has the same frequency bandwidth. In addition, it consists of pulses having no orthogonality with each other.

 [Equation 7]

Equation 8 shows the correlation function characteristics.

[Equation 8]

3 is a diagram illustrating a transmitting device 310 and a receiving device 320 of the human body communication network system 300 according to an embodiment of the present invention.

The transmitting device 310 generates a ternary code and a pulse signal, transmits the generated ternary code based on a preselected ternary code sequence, and transmits the generated pulse signal based on a preselected pulse order. Can be.

The transmitting device 310 is at least one of high speed synchronous, low speed synchronous, high speed asynchronous, and low speed asynchronous.

When the transmitting device 310 is one of high speed synchronous and low speed asynchronous,

The transmitting device 310 may increase the time hopping interval by using the time hopping technique, the ternary code technique, and the MHP pulse technique, and reduce and transmit the duration of the modified hermite polynomial (MHP) pulse.

When the transmitting device 310 is one of a low speed synchronous type and a high speed asynchronous type, the time hopping period may be reduced, and the duration of the MHP pulse and the ternary code may be increased.

For example, the transmitting apparatus 310 may include a ternary code signal generator for generating the ternary code signal, and a transmitting RF unit for transmitting based on the selected ternary code sequence.

The receiving device 320 receives the transmitted ternary code and the transmitted pulse signal, and uses correlation detection to select the predetermined pulse order and the selected turner from the transmitted ternary code and the transmitted pulse signal. The record sequence can be detected. In this case, the receiving device 320 may detect a signal between users using the detected preselected pulse order and the preselected ternary code sequence.

In the case of synchronous high speed transmission, the reception device 320 may extend the time hopping interval using the orthogonality of the MHP pulses, and detect the self signal using the ternary code technique and the MHP pulse technique based on the correlation characteristics. have.

In one example, the receiving device 320 is a receiving RF unit for receiving a signal sent in the multiple signal of each multi-user, a correlation detector for detecting a correlation in the received signal, and the multi-user using the detected correlation It may include a detector for detecting a signal of.

In addition, the receiving device 320 calculates the ratio of the power of the portion containing the ternary code sequence and the MHP pulse signal and the signal where there is no signal and only noise, and uses the calculated value as software to The ratio of the maximum value and the minimum value of energy among the received signals can be calculated.

Referring to FIG. 3, the transmitting apparatus 310 transmits PPM modulation with a ternary code sequence by allocating pulses of an order according to each user. Each user is assigned a time jump interval and an MHP pulse. For both high-speed transmission and low-speed transmission, the modulation scheme uses PS-BPPM, a pulse-type binary PPM scheme that transmits bit information according to the shape and position of the pulse.

는 전송되는 MHP 펄스를 각각 나타낸다. 심볼 정보는

이며 펄스가 위치하는

구간의 위치에 따라 0 또는 1을 나타낸다. Tf　는 하나의 프레임 구간을 나타내며

은 다중 접속을 위한 시간 도약구간을 지정한다.

는 다중 사용자간의 터너리 코드로써 사용자간의 신호 구분을 한다. Tburst는 연집 펄스 구간이며 고속 전송을 위한 WBAN 심볼 구조에서는 Tburst구간에 하나의 펄스가 전송된다.The signal of the transmission device 310 of the k-th user is expressed by Equation (9). Eb is the bit energy, N is the symbol sequence length, M is the index of the symbol information to be sent,

Denote each MHP pulse that is transmitted. Symbol information

Where the pulse is located

0 or 1 depending on the position of the section. Tf represents one frame interval

Specifies the time hopping interval for multiple accesses.

Is a ternary code between multiple users to distinguish signals between users. Tburst is a concatenated pulse interval, and in the WBAN symbol structure for high-speed transmission, one pulse is transmitted in the Tburst interval.

&Quot; (9) "

[Table 1]

In the present invention, as shown in Table 1, the time leap interval and the ternary code length are shown for each mode in the high speed transmission and the low speed transmission. In the case of the high speed transmission, the mode 1 has the ternary code length of 1 and one pulse without the ternary code. The time leap section consists of 16 sections. Mode 2 consists of 4 pulses with a ternary code length of 4, and multiple time hop sections are connected in 4 sections. Mode 3 consists of eight pulses with a ternary code length of 8, with a two-hour time span. Mode 4 consists of 16 pulses with a ternary code length of 16 and there is no time hopping interval.

In case of low-speed transmission, MHP and IR are used without using ternary code, and the number of pulses is 16, and the time jump section is also 16 sections, indicating Mode 1. In Mode 2, the number of pulses and the time leap interval are the same as in Mode 1, and they are transmitted using a ternary code. Mode 3 transmits 64 pulses by increasing the number of pulses. Mode 4 has 128 pulses and 2 time hopping periods. In other words. By increasing the length of the ternary code, we verify the characteristics of the code by reducing the time leap interval and conversely by verifying the characteristics of the time leap technique by increasing the time leap interval by reducing the code length. And we find the best performance in each mode and optimize it for WBAN system.

는 WBAN 채널에 의한 경로손실이며,

는 k번째 사용자의 전파 지연시간이다. 그리고 평균이 0이고, 분산이

인 AWGN이다.

는 다중사용자의 간섭을 나타낸다. 수신 장치(320)에서는 수신된 신호를 각각의 차수에 맞게 MHP펄스에 의한 correlator를 통해 신호 검출을 수행하게 된다. 직교성을 가지는 MHP펄스와 터너리 코드를 이용하여 검출한 신호는 수신기에 의해 디지털 신호로 변환된다.The signal received by the receiving device 320 is as shown in Equation 10. here

Is the path loss caused by the WBAN channel,

Is the propagation delay time of the k-th user. And the mean is zero, the variance

Is AWGN.

Indicates interference of multiple users. The reception device 320 performs signal detection through a correlator using MHP pulses according to the orders. The signal detected using the orthogonal MHP pulse and the ternary code is converted into a digital signal by the receiver.

&Quot; (10) "

4 is a diagram illustrating the performance of a multiple access scheme in asynchronous high speed transmission.

Referring to FIG. 4, a method using Gaussian pulses and a method using MHP pulses may be broadly divided. The performance of each ternary code is also shown. In high-speed transmission, since one symbol length is small, the interference is severe and the channel is affected.

에서 4dB정도 성능이 우수한 것을 도 4을 통해 알 수 있다. MHP 펄스의 상호 직교성이 우수하여 IR보다 성능이 좋은 것을 확인 할 수 있으며 터너리 코드길이 보다는 MHP 펄스의 상호 직교성이 우수한 것을 MHP그룹 군과 IR그룹 군을 통해 알 수 있다.As described above, in Mode 1, since the number of chips per burst (Ncpb) is one, that is, information is transmitted using one pulse, it is difficult to distinguish a signal due to the influence of a channel and the interference between multiple users. Therefore, it can be seen that an error flow occurs in both MHP and IR. However, in case of MHP pulse and IR, it is possible to reduce the collision and interference of the pulse due to the characteristics of the code in the WBAN environment, which varies depending on the code length, depending on the code length. In case of transmitting signals using MHP pulses and ternary code sequences, BER is less than transmitted using IR and ternary code sequences.

In Figure 4 it can be seen that the excellent performance of about 4dB. The MHP pulses have superior mutual orthogonality, which shows better performance than IR, and the MHP group group and IR group group show that the MHP pulses have better mutual orthogonality than the ternary code length.

In addition, the characteristics of the ternary code lengths showed that the number of pulses was 16 (mode 4) and the Eb / N0 was 18 and 21, respectively.

5 is a graph illustrating multiple access performance in synchronous fast transmission.

Referring to FIG. 5, in the synchronous high-speed transmission, a signal collision between multiple users can be sufficiently avoided in a time hopping interval by transmitting a signal at the same time, so that a signal can be detected by multiple users at the receiving end even using a single pulse. By using the time hopping interval more than the case of using the ternary code, it is possible to distinguish between signals and avoid interference.

6 is a graph showing the performance as the number of multiple access users in synchronous fast transmission increases.

을 12dB에서 만족하는 것을 알 수 있다. Referring to FIG. 6, the performance of MHP Mode 1 using MHP and using a lot of time hopping intervals is a target BER for video and audio transmission.

It can be seen that is satisfied at 12dB.

7 is a graph illustrating multiple access performance in synchronous slow transmission.

Referring to FIG. 7, in the case of synchronous low-speed transmission, one symbol length is longer than high-speed transmission, so there is less multi-delay interference, and 16 Ncpb can facilitate signal detection between multiple users. Therefore, no error flow occurs and the performance is shown in Figure 4-9 according to each. As in the case of high-speed transmission, the transmission using MHP is about 2 to 3 dB better than the transmission using IR. It can be seen that the performance is about 2 ~ 3dB better than in the synchronous type. In synchronous mode, HMPs Mode 4 with 128 pulses and 2 time hopping sections showed the best performance using MHP pulses and ternary codes. This is because signal interference and multichannel interference can be reduced by transmitting a signal by reducing the time hopping interval and increasing the number of pulses.

8 is a graph illustrating multiple access performance in synchronous slow transmission.

Referring to FIG. 8, an error flow occurred in the case of Mode 1 of each pulse in the asynchronous manner. This is because the characteristics of the pulse caused an error flow in the collision and interference of the signal. In other pulses, the ternary code is used to transmit the MHP group by 2-3dB over the IR group. MHP Mode 3, which uses MHP pulse and ternary code and divides the time hopping section into 4 sections, shows the best performance.

As such, since internal and external communication requires low power and high reliability, a UWB-IR suitable for this purpose has been proposed, and MHP pulses and ternary codes having excellent mutual orthogonality are used for a multiple access scheme. As such, it can be seen that the multiple access method using the MHP pulse is superior in the external communication environment requiring low power and high reliability than the multiple access method using the Gaussian IR.

In the method of operating a human body communication network system according to an embodiment of the present invention, a ternary code and a pulse signal are generated through a transmitting device, and the generated ternary code is transmitted based on a pre-selected ternary code sequence. The method may include transmitting the generated pulse signal based on a preselected pulse order.

Also, receiving the transmitted ternary code and the transmitted pulse signal through a receiving device, and using the correlation detection, the predetermined pulse order and the selected turner from the transmitted ternary code and the transmitted pulse signal. Detecting the record sequence.

In this case, the receiving device may detect a signal between users using the detected predetermined pulse order and the selected ternary code sequence.

A method of operating a human body communication network system according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

300: human body communication network system
310: transmitting device
320: receiving device

Claims (11)

A transmitter for generating a ternary code and a pulse signal, transmitting the generated ternary code based on a preselected ternary code sequence, and transmitting the generated pulse signal based on a preselected pulse order; And
Receiving the transmitted ternary code and the transmitted pulse signal, and detecting the predetermined pulse order and the selected ternary code sequence from the transmitted ternary code and the transmitted pulse signal using correlation detection; Receiver
Including,
The receiving device detects a signal between users using the detected preselected pulse order and the preselected ternary code sequence, and in the case of synchronous high speed transmission, the human body communication which extends the time hopping interval using the orthogonality of the MHP pulse. Network system. The method of claim 1,
And said transmitting device is at least one of high speed synchronous, low speed synchronous, high speed asynchronous, and low speed asynchronous. The method of claim 2,
When the transmitting device is one of high speed synchronous and low speed asynchronous,
The transmitting device increases the time hopping interval by using a time hopping technique, a ternary code technique, and an MHP pulse technique, and reduces and transmits a duration of a modified hermite polynomial (MHP) pulse. The method of claim 3,
If the transmitting device is any one of a low speed synchronous and a high speed asynchronous,
The transmitting apparatus reduces the time hopping interval, and increases and transmits the duration of the MHP pulse and the ternary code. delete The method of claim 1,
And the receiving apparatus detects a self signal using a ternary code technique and an MHP pulse technique based on correlation characteristics. The method of claim 1,
The transmitting device,
A ternary code signal generator configured to generate the ternary code signal; And
A transmitting RF unit transmitting based on the selected ternary code sequence
Human body communication network system comprising a. The method of claim 1,
The receiving device,
A receiving RF unit for receiving a signal sent in multiple signals of each multi-user;
A correlation detector for detecting a correlation in the received signal; And
A detector for detecting a signal of a multi-user using the detected correlation
Human body communication network system comprising a. The method of claim 1,
The receiving device,
Calculate the ratio of the power of the portion containing the ternary code sequence and the MHP pulse signal and the signal where there is no signal and only noise, and use the calculated value as soft to maximize the energy of the received signal. And a human body communication network system for calculating a ratio of minimum values. Generating a ternary code and a pulse signal, transmitting the generated ternary code based on a preselected ternary code sequence, and transmitting the generated pulse signal based on a preselected pulse order;
A receiving device receives the transmitted ternary code and the transmitted pulse signal and uses correlation detection to select the predetermined pulse order and the selected ternary code from the transmitted ternary code and the transmitted pulse signal. Detecting the sequence
Including,
The receiving device detects a signal between users using the detected preselected pulse order and the preselected ternary code sequence, and in the case of synchronous high speed transmission, the human body communication which extends the time hopping interval by using the orthogonality of the MHP pulse. How network systems work. A computer-readable recording medium having recorded thereon a program for performing the method of claim 10.

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