KR101923522B1 - Apparatus for changing pseudo random binary sequence, direct sequence spread spectrum transmitter/receiver and transmitting/receiving system of changing pseudo random binary sequence - Google Patents

Abstract

A PRBS automatic changing apparatus, a direct spread spectrum transmission / reception apparatus and a transmission / reception system for automatically changing PRBS are disclosed. Spreading and modulating data by a direct sequence spread spectrum method using a predetermined pseudo random binary sequence (PRBS) to generate a preamble corresponding to a seed of the PRBS, A direct spread spectrum transmission apparatus for transmitting a signal with a direct spread spectrum transmission system; A receiver for receiving a signal from the direct spread spectrum transmission apparatus and performing a cross correlation with a preamble set of a preamble of a received signal, A direct spread spectrum receiving apparatus for detecting a seed corresponding to a preamble having the highest relation and performing demodulation using PRBS corresponding to the detected seed. According to the PRBS automatic changing apparatus, the direct spread spectrum transmission / reception apparatus and the transmission / reception system for automatically changing the PRBS, the preamble corresponding to the seed of the PRBS in advance in the synchronization process of the receiving end is set in advance with a plurality of predetermined preamble sets Correlation can be detected so that the seed can be securely transmitted to the receiving end and the PRBS can be changed at any time to securely increase the communication security.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PRBS automatic changing apparatus, a direct spread spectrum transmission / reception apparatus and a transmission / reception system for automatically changing a PRBS, and a system for transmitting /

The present invention relates to a direct sequence spread spectrum transmission / reception apparatus and a transmission / reception system, and more particularly, to a direct spread spectrum transmission / reception apparatus and a transmission / reception system for directly changing a pseudo random binary sequence (PRBS) And more specifically, to a PRBS automatic changing device, a direct spread spectrum type transmitting / receiving device for automatically changing PRBS, and a transmitting / receiving system.

1 is a block diagram of a direct band spreading transmission / reception system using PRBS according to the prior art.

Referring to FIG. 1, a direct spread spectrum transmission / reception system 10 using a conventional pseudo random binary sequence (PRBS) is disclosed.

In the conventional direct spread spectrum transmission and reception system 10, the transmitting terminal is configured to spread / modulate data using a pseudo random binary sequence (PRBS) in a direct sequence spread spectrum and transmit the modulated signal . The receiver receives the signal and demodulates the signal by despreading it using the same PRBS.

PRBS is spread / modulated by using PRBS, which is advantageous in that the security is high and the noise is diffused at the time of restoration, thereby being less influenced by the communication channel. Also, since the signal strength is not high, it affects other signals small.

Since the transmitting end and the receiving end must use the same PRBS, PRBS promised in advance is used. However, since PRBS is leaked, there is a problem in security. To prevent this, PRBS is changed by transmitting a seed indicating a PRBS in a separate control message from the transmitting end to the receiving end.

However, these schemes are problematic in security, and control messages are also at risk of being exposed at any time.

10-2010-0050706 10-2008-0090135

It is an object of the present invention to provide a direct spread spectrum transmission / reception system for automatically changing PRBS.

It is another object of the present invention to provide a direct spread spectrum transmission apparatus for automatically changing PRBS.

It is another object of the present invention to provide a direct spread spectrum receiving apparatus for automatically changing PRBS.

It is still another object of the present invention to provide a transmitter PRBS automatic changing apparatus.

It is still another object of the present invention to provide a receiving end PRBS automatic changing apparatus.

The direct spread spectrum transmission and reception system for automatically changing the PRBS according to the object of the present invention may be a system for spreading and modulating data by a direct sequence spread spectrum scheme using a predetermined pseudo random binary sequence (PRBS) a direct spread spectrum transmission apparatus for transmitting a signal with a preamble corresponding to a seed of the PRBS by performing a modulation of the preamble; A receiver for receiving a signal from the direct spread spectrum transmission apparatus and performing a cross correlation with a preamble set of a preamble of a received signal, And a direct spread spectrum receiving apparatus that detects a seed corresponding to a preamble having the highest relation and performs despreading and demodulation using PRBS corresponding to the detected seed.

Here, the direct spread spectrum transmission apparatus includes a channel encoder module for performing channel encoding on the data; A modulation module for performing spreading and modulation on the channel-encoded data in the channel encoder module using PRBS; A transmitter PRBS generation module for generating a PRBS for performing modulation in the modulation module and providing the generated PRBS to the modulation module in real time; A transmitting end PRBS automatic changing device for controlling to change or create the PRBS to be generated by the transmitting end PRBS generating module in real time and selecting and generating a preamble corresponding to a seed for specifying or generating a PRBS to be changed in real time .

The transmitting end PRBS automatic changing apparatus includes: a seed changing module for changing a seed for instructing PRBS periodically or non-periodically by control or automatic control by a user in real time and controlling spreading and modulation by the corresponding PRBS; And a preamble generation module for selecting and generating a preamble corresponding to a seed changed in real time in the seed change module.

The direct spread spectrum receiving apparatus performs cross-correlation between a preamble of a signal received from the direct spread spectrum transmission apparatus and a plurality of preamble sets preliminarily provided, selects a preamble having the highest correlation, A receiving end PRBS automatic changing device for providing a corresponding seed; A receiving end PRBS selection module for receiving the seed from the received PRBS automatic changing device and selecting and providing the corresponding PRBS; A demodulation module for despreading and demodulating the signal using the PRBS provided by the receiving end PRBS selecting module; And a channel decoder module for performing channel decoding on the demodulated signal in the demodulation module.

The receiving end PRBS automatic changing apparatus may further comprise: a preamble set database storing a plurality of preamble sets previously provided; A preamble cross-correlation module for performing cross-correlation with a preamble of a signal received from the direct spread spectrum transmission apparatus for each of a plurality of preamble sets stored in the preamble set database; And a PRBS seed detection module for selecting a preamble having the highest correlation among the preamble sets as a result of the cross-correlation performed by the preamble cross-correlation module and detecting a seed corresponding to the selected preamble in advance.

According to another aspect of the present invention, there is provided a direct band spread transmission apparatus for automatically changing a PRBS, comprising: a channel encoder module for performing channel encoding on data; A modulation module that performs modulation using PRBS for channel-encoded data in the channel encoder module; A transmitter PRBS generation module for generating a PRBS for performing modulation in the modulation module and providing the generated PRBS to the modulation module in real time; A transmitting end PRBS automatic changing device for controlling to change or create the PRBS to be generated by the transmitting end PRBS generating module in real time and selecting and generating a preamble corresponding to a seed for specifying or generating a PRBS to be changed in real time .

Here, the transmitting end PRBS automatic changing apparatus may include: a seed changing module that performs real-time change of a seed corresponding to PRBS periodically or non-periodically by user's control or automatic control, and controls modulation and spreading by the corresponding PRBS; And a preamble generation module for generating a preamble corresponding to the seed changed in real time in the seed change module.

In accordance with another aspect of the present invention, there is provided a direct band spreading reception apparatus for automatically changing a PRBS, the apparatus comprising: a receiver for performing cross-correlation between a preamble of a signal received from the direct spread spectrum transmission apparatus and a plurality of preamble sets A receiving end PRBS automatic changing device for selecting a preamble with the highest correlation and providing a seed corresponding to the selected preamble in advance; A receiving end PRBS selection module for receiving the seed from the received PRBS automatic changing device and selecting and providing the corresponding PRBS; A demodulation module for despreading and demodulating the signal using the PRBS provided by the receiving end PRBS selecting module; And a channel decoder module for performing channel decoding on the despread and demodulated signals in the demodulation module.

Here, the receiving end PRBS automatic changing apparatus may further include: a preamble set database storing a plurality of preamble sets previously provided; A preamble cross-correlation module for performing cross-correlation with a preamble of a signal received from the direct spread spectrum transmission apparatus for each of a plurality of preamble sets stored in the preamble set database; And a PRBS seed detection module for selecting a preamble having the highest correlation among the preamble sets as a result of the cross-correlation performed by the preamble cross-correlation module and detecting a seed corresponding to the selected preamble in advance.

According to another aspect of the present invention, there is provided a transmitter-PRBS automatic changing apparatus, which real-time changes a seed for periodically or non-periodically instructing PRBS by user's control or automatic control, and performs modulation and spreading by the corresponding PRBS A seed change module for controlling the seed change module; And a preamble generation module for generating a preamble corresponding to the seed changed in real time in the seed change module.

According to another aspect of the present invention, there is provided a receiving end PRBS automatic changing apparatus comprising: a preamble set database storing a plurality of preamble sets; A preamble cross-correlation module for performing cross-correlation with a preamble of a signal received from the direct spread spectrum transmission apparatus for each of a plurality of preamble sets stored in the preamble set database; And a PRBS seed detection module for selecting a preamble having the highest correlation among the preamble sets as a result of the cross-correlation performed by the preamble cross-correlation module and detecting a seed corresponding to the selected preamble in advance.

According to the PRBS automatic changing apparatus, the direct spread spectrum transmission / reception apparatus and the transmission / reception system for automatically changing the PRBS, the preamble corresponding to the seed of the PRBS in advance in the synchronization process of the receiving end is set in advance with a plurality of predetermined preamble sets Correlation can be detected so that the seed can be securely transmitted to the receiving end and the PRBS can be changed at any time to securely increase the communication security.

1 is a block diagram of a direct band spreading transmission / reception system using PRBS according to the prior art.
2 is a block diagram of a direct spread spectrum transmission and reception system for automatically changing PRBS according to an embodiment of the present invention.
FIG. 3 is a block diagram of a transmitter PRBS automatic changing apparatus according to an embodiment of the present invention. Referring to FIG.
FIG. 4 is a block diagram of a receiving end PRBS automatic changing apparatus according to an embodiment of the present invention.
5 is a flowchart of a direct spread spectrum transmission / reception method of automatically changing PRBS according to an embodiment of the present invention.
6 is a detailed flowchart of a direct spread spectrum transmission method for automatically changing a PRBS according to an embodiment of the present invention.
7 is a detailed flowchart of a direct spread spectrum receiving method for automatically changing a PRBS according to an embodiment of the present invention.
8 is a flowchart of a method for automatically changing a transmitter PRBS according to an embodiment of the present invention.
9 is a flowchart of a method of automatically changing a receiving end PRBS according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

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

2 is a block diagram of a direct spread spectrum transmission and reception system for automatically changing PRBS according to an embodiment of the present invention.

Referring to FIG. 2, a direct spread spectrum transmission and reception system 100 for automatically changing a PRBS according to an embodiment of the present invention includes a direct spread spectrum transmission apparatus 110 and a direct spread spectrum reception apparatus 120 .

The direct spread spectrum transmission and reception system 100 generates a preamble corresponding to a seed indicating a pseudo random binary sequence (PRBS) in the direct spread spectrum transmission apparatus 110, (120).

The direct spread spectrum reception apparatus 120 sequentially correlates the preamble with a preamble set predefined in advance, and finds a preamble with the highest cross-correlation among the preamble sets. And to detect an index of a seed or a seed corresponding to the preamble. Here, the direct spread spectrum receiving apparatus 120 can detect the seed using the index for the seed. The direct spread spectrum receiving apparatus 120 is configured to despread the signal using the PRBS indicated by the seed using this seed.

And recognize a seed corresponding to the preamble in advance.

Accordingly, the direct band spreading transmission apparatus 110 can inform the direct band spreading reception apparatus 120 of the remote location securely at any time during communication.

Hereinafter, the detailed configuration will be described.

The direct spread spectrum transmission apparatus 110 may be configured to perform spreading and modulation of data using direct PRBS in a direct spread spectrum manner.

The direct spread spectrum transmission apparatus 110 may be configured to include a channel encoder module 111, a modulation module 112, and a transmitter-side PRBS generation module 113.

Here, the channel encoder module 111 may be configured to perform channel encoding on input data.

The modulation module 112 may be configured to perform spreading and modulation on the channel-encoded data in the channel encoder module 111 using PRBS.

The transmitting end PRBS generating module 113 may be configured to generate a PRBS for directly performing spread spectrum spreading in the modulation module 112 and provide the generated PRBS to the modulation module 112 in real time. PRBS can be generated and provided in real time.

The transmitting end PRBS automatic changing device 114 may be configured to control the transmission end PRBS generating module 113 to designate or generate and change the PRBS to be generated in real time.

The transmitting end PRBS automatic changing apparatus 114 may be configured to generate a PRBS corresponding to a seed in advance by selecting a preamble corresponding to a seed in advance to specify a PRBS to be changed or to generate a PRBS to be changed in real time.

The direct spread spectrum type reception device 120 is a configuration for receiving a signal from the direct spread spectrum type transmission device.

The direct spread spectrum receiving apparatus 120 may be configured to sequentially perform cross correlation with a plurality of preamble sets preliminarily secured among the received signals. Here, the preamble having the highest correlation among the preamble sets may be searched and the information about the seed may be detected from the preamble. And perform despreading and demodulation using the PRBS of the seed.

For example:

Preamble index Preamble 0 Preamble 00 One Preamble 01 2 Preamble 02 3 Preamble 03 ... ... 99 Preamble 99

When a direct correlation is performed in the direct spread spectrum type receiving apparatus 120, the preamble index 2 of the preamble 02 is extracted, assuming that the preamble 02 in the above Table 1 has the highest cross-correlation. The preamble index corresponds to the seed information.

The seed can be detected as a seed of 2 + 3 = 5 by a predetermined predetermined formula, for example, a promise of preamble index + 3.

The direct spread spectrum receiving apparatus 120 is configured to include a PRBS automatic changing apparatus 121, a receiving end PRBS selecting module 122, a demodulation module 123, and a channel decoder module 124 .

The receiving end PRBS automatic changing apparatus 121 may be configured to perform a cross-correlation between a preamble of a received signal and a plurality of preambles set in advance to select a preamble with the highest correlation. And to detect information on the seeds accordingly.

The receiving end PRBS selecting module 122 may be configured to select among the PRBSs previously reserved for the PRBS designated or generated by the receiving end PRBS automatic changing device 121 and provide the selected PRBS to the demodulating module 123. [

The demodulation module 123 may be configured to despread and demodulate the signal using the PRBS provided by the receiving end PRBS selection module 122. [

The channel decoder module 124 may be configured to perform channel decoding on the demodulated signal in the demodulation module 123.

FIG. 3 is a block diagram of a transmitter PRBS automatic changing apparatus according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 3, a transmitter PRBS automatic changing apparatus 114 according to an embodiment of the present invention may be configured to include a seed change module 114a and a preamble generation module 114b.

Hereinafter, the detailed configuration will be described.

The seed change module 114a may be configured to change a seed or an index that instructs PRBS periodically or aperiodically by user's control or automatic control in real time.

The seed change module 114a may be configured so that the transmitter-side PRBS generation module 113 generates or selects the corresponding PRBS, and controls the modulation module 112 to perform spreading by the corresponding PRBS.

The preamble generation module 114b may be configured to generate information by inserting information about a seed changed in real time in the preamble by the seed modification module 114a.

FIG. 4 is a block diagram of a receiving end PRBS automatic changing apparatus according to an embodiment of the present invention.

4, a receiving end PRBS automatic changing apparatus 121 according to an embodiment of the present invention includes a preamble set database 121a, a preamble cross correlation module 121b, and a PRBS seed detecting module 121c .

Hereinafter, the detailed configuration will be described.

The preamble set database 121a may be configured to store a plurality of preset preamble sets. The preamble set may be configured to be secured between the transmitting end and the receiving end.

The preamble cross correlation module 121b may be configured to sequentially perform cross correlation with a preamble of a signal received from the direct spread spectrum transmission device 110 for each of a plurality of preamble sets stored in the preamble set database 121a .

The PRBS seed detection module 121c may be configured to select a preamble having the highest correlation among the set of cross-correlation result preambles performed in the preamble cross-correlation module 121b. And to detect information about a seed previously included in the selected preamble.

5 is a flowchart of a direct spread spectrum transmission / reception method of automatically changing PRBS according to an embodiment of the present invention.

Referring to FIG. 5, first, the direct band spreading transmission apparatus 110 spreads and modulates data by a direct sequence spread spectrum method using a pseudo random binary sequence (PRBS) A signal is directly transmitted to the spread spectrum type receiving apparatus together with a preamble corresponding to a seed of PRBS (S110).

Next, a direct spread spectrum receiving apparatus receives a signal from the direct spread spectrum transmission apparatus and cross-correlates the preamble of the received signal with a plurality of preamble sets preliminarily provided A seed corresponding to a preamble having the highest correlation by cross-correlation is detected in the preamble set, and despreading and demodulation are performed using PRBS corresponding to the detected seed (S120).

6 is a detailed flowchart of a direct spread spectrum transmission method for automatically changing a PRBS according to an embodiment of the present invention.

Referring to FIG. 6, the channel encoder module 111 performs channel encoding on data (S111).

Next, the modulation module 112 performs modulation and spreading on the channel-encoded data in the channel encoder module 111 using PRBS (S112).

Next, the transmitter-side PRBS generation module 113 generates a PRBS for performing spreading in the modulation module 112 and provides it to the modulation module 112 in real time (S113).

Next, the transmitting-end PRBS automatic changing apparatus 114 controls the transmitting-end PRBS generating module 113 to designate or generate and change the PRBS to be generated in real time, and controls the PRBS to be changed in real time, (S114).

7 is a detailed flowchart of a direct spread spectrum transmission method for automatically changing a PRBS according to an embodiment of the present invention.

Referring to FIG. 7, first, the receiving end PRBS automatic changing apparatus 121 performs cross-correlation between a preamble of a signal received from the direct spread spectrum transmission apparatus 110 and a plurality of preamble sets preliminarily provided, Selects a preamble and detects a seed corresponding to the selected preamble in advance and provides a seed (S121).

Next, the receiving end PRBS selecting module 122 receives the seed from the received PRBS automatic changing device 121, and selects and provides the corresponding PRBS (S122).

Next, the demodulation module 123 despreads and demodulates the signal using the PRBS provided from the receiving end PRBS selection module 122 (S123).

Next, the channel decoder module 124 performs channel decoding on the demodulated signal from the demodulation module 123 (S124).

8 is a flowchart of a method for automatically changing a transmitter PRBS according to an embodiment of the present invention.

Referring to FIG. 8, first, the seed change module 114a controls the seed in which the PRBS is periodically or aperiodically indicated by the user's control or automatic control, in real time, and performs spreading and modulation by the corresponding PRBS S114a).

Next, the preamble generation module 114b generates a preamble corresponding to the seed changed in real time in the seed modification module 114a (S114b).

9 is a flowchart of a method of automatically changing a receiving end PRBS according to an embodiment of the present invention.

9, first, the preamble cross-correlation module 121a performs cross-correlation with the preamble of the signal received from the direct spread spectrum transmission apparatus 110 for each of a plurality of preamble sets stored in the preamble set database 121a (S121a).

Next, the PRBS seed detection module 121c selects a preamble having the highest correlation among the sets of cross-correlation result preambles performed in the preamble cross-correlation module 121a, and detects a seed corresponding to the selected preamble in advance (S121b) .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

110: direct spread spectrum transmission device
111: Channel encoder module
112: Modulation module
113: Transmitter PRBS generation module
114: Transmitter PRBS automatic changing device
114a: seed change module
114b: preamble generation module
120: direct spread spectrum receiver
121: Receiver PRBS automatic changing device
121a: preamble set database
121b: Preamble cross-correlation module
121c: PRBS seed detection module
122: Receiver PRBS selection module
123: demodulation module
124: Channel decoder module

Claims (11)

Spreading and modulating data by a direct sequence spread spectrum method using a predetermined pseudo random binary sequence (PRBS) to generate a preamble corresponding to a seed of the PRBS, A direct spread spectrum transmission apparatus for transmitting a signal with a direct spread spectrum transmission system;
A receiver for receiving a signal from the direct spread spectrum transmission apparatus and performing a cross correlation with a preamble set of a preamble of a received signal, And a direct spread spectrum receiving apparatus for detecting a seed corresponding to a preamble having the highest relation and performing despreading and demodulation using PRBS corresponding to the detected seed,
The direct spread spectrum transmission apparatus includes:
Wherein a seed for PRBS is periodically or non-periodically changed by a user's control or automatic control in real time, spread and modulated by the corresponding PRBS, and a preamble corresponding to the seed changed in real time is selected and generated,
The direct band spread method receiving apparatus includes:
For each of a plurality of preamble sets preliminarily provided, selecting a highest preamble by performing cross-correlation with a preamble of a signal received from the direct spread spectrum transmission apparatus, and detecting a seed corresponding to a preamble selected in advance,
The direct spread spectrum transmission apparatus includes:
Time modified seed is inserted into the preamble,
The direct band spread method receiving apparatus includes:
And a seed is detected by applying a preamble index of a preamble having a highest correlation among the preamble sets to a predetermined formula.
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