KR20000040481A - Method for distinguishing user by using synchronous burst in wide band mobile multimedia system - Google Patents

Method for distinguishing user by using synchronous burst in wide band mobile multimedia system Download PDF

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KR20000040481A
KR20000040481A KR1019980056140A KR19980056140A KR20000040481A KR 20000040481 A KR20000040481 A KR 20000040481A KR 1019980056140 A KR1019980056140 A KR 1019980056140A KR 19980056140 A KR19980056140 A KR 19980056140A KR 20000040481 A KR20000040481 A KR 20000040481A
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South Korea
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signal
offset value
terminal
synchronization burst
transmitted
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KR1019980056140A
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Korean (ko)
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KR100304115B1 (en
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정화영
이성식
이규화
서용창
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강상훈
이계철
한국전기통신공사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/70735—Code identification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation

Abstract

PURPOSE: A method for distinguishing user by using a synchronous burst in a wide band mobile multimedia system is provided to markedly improve the process speed of a signal and subsequently improve the whole operation speed of the system by promptly distinguishing user with viewing only the synchronous burst of the transmitted signal. CONSTITUTION: A signal received from a transmission terminal is diffusely transmitted with loading specific user mode in raw data to be transmitted from a base station to one terminal(402). The base station finds an offset value of a synchronous burst by searching the signal transmitted to a specific terminal and finds a diffusion code used in the transmission referring to a predetermined table(401,402). Then, the raw data are extracted and reversely diffused by using the corresponding code for restoring the wanted user signal(405,406,407).

Description

광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법User Distinguishing Method Using Synchronous Burst in Broadband Mobile Multimedia Systems

본 발명은 광대역 이동멀티미디어 시스템에서 동기용 버스트(Sync Burst)를 이용한 사용자 구별 방법에 관한 것으로서, 특히 40GHz 정도의 밀리미터파 대역의 주파수 자원을 이용하는 광대역 이동멀티미디어 시스템에서 프레임 동기를 위해 사용되는 동기용 버스트(Sync Burst)을 이용하여 사용자 단말기를 구별하기 위한 사용자 구별 방법에 관한 것이다.The present invention relates to a user discrimination method using a synchronization burst in a broadband mobile multimedia system. In particular, a synchronization burst used for frame synchronization in a broadband mobile multimedia system using a frequency resource in a millimeter wave band of about 40 GHz. The present invention relates to a user distinguishing method for distinguishing a user terminal using a sync burst.

일반적으로, 광대역 이동멀티미디어 시스템은 41 내지 43GHz 대역 부근의 주파수를 이용하여 멀티미디어 서비스를 제공하는 시스템으로서 기지국과 단말기로 구성된다.In general, a broadband mobile multimedia system is a system for providing a multimedia service using a frequency in the vicinity of the 41 to 43GHz band is composed of a base station and a terminal.

그러나, 단일 기지국에 다수의 단말기가 접속하여 통신하는 경우, 각 단말을 구별할 수 있는 방안으로 코드다중접속 시스템에서는 데이터에 실려있는 코드를 찾아내는 방식이 사용되었으나, 이러한 종래의 방법으로는 코드를 찾아내는 과정과 데이터를 찾아내는 두가지 과정을 이중으로 처리해야 하는 비효율적인 문제점이 있었다.However, when multiple terminals are connected to and communicate with a single base station, the code multiplexing system finds a code contained in data as a method of distinguishing each terminal. There was an inefficient problem of double processing the process and the process of finding the data.

따라서, 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 광대역 이동멀티미디어 시스템에서 동기를 위해 사용되는 동기용 버스트를 이용하여 각 단말기의 신호를 구별하여 송신된 신호의 동기용 버스트만 보고 신속히 사용자를 구별해 낼수 있는 사용자 구별 방법 및 그를 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록매체를 제공하는데 그 목적이 있다.Accordingly, the present invention has been made to solve the above problems, and by using the synchronization burst used for synchronization in a broadband mobile multimedia system to distinguish the signal of each terminal to see only the synchronization burst of the transmitted signal quickly It is an object of the present invention to provide a user-readable method for distinguishing users and a computer-readable recording medium recording a program for realizing the user.

도 1은 본 발명이 적용되는 이동 멀티미디어 시스템에서의 역방향 송수신 장치의 구성도.1 is a block diagram of a reverse transmission and reception apparatus in a mobile multimedia system to which the present invention is applied.

도 2는 본 발명이 적용되는 무선이동 멀티미디어 시스템의 동기용 버스트에 대한 설명도.2 is an explanatory diagram for synchronization burst of a wireless mobile multimedia system to which the present invention is applied.

도 3은 본 발명이 적용되는 단말기의 구성 개략도.3 is a schematic diagram of a terminal to which the present invention is applied;

도 4는 본 발명에 따른 광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법에 대한 일실시예 흐름도.4 is a flowchart illustrating a method for identifying a user using a synchronization burst in a broadband mobile multimedia system according to the present invention.

도 5는 본 발명에 적용되는 각 단말들에 해당하는 옵셋들의 구조도.5 is a structure diagram of offsets corresponding to respective terminals applied to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

311: 데이터 발생부 312: 데이터 매퍼311: data generator 312: data mapper

313 내지 316, 321 내지 324: 승산기313 to 316 and 321 to 324 multipliers

317, 318, 325, 326: 가산기317, 318, 325, 326: adder

327: 데이터 디매퍼327: Data Demapper

328: 채널 디코딩부328: channel decoding unit

이와 같은 목적을 달성하기 위한 본 발명은, 광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법에 있어서, 기지국에서 한 단말기로 송신할 원시 데이터에 특정 사용자 모드를 실어 송신하는 제 1 단계; 특정 단말기에 전달된 신호를 탐색하여 동기용 버스트(Burst) 코드의 옵셋(offset) 값을 찾아낸 후, 소정의 테이블을 참조하여 송신시 사용된 확산코드를 찾아내는 제 2 단계; 및 찾아낸 확산코드를 이용하여 역확산한 후 원하는 신호를 복원하는 제 3 단계를 포함한다.According to an aspect of the present invention, there is provided a user discriminating method using a synchronization burst in a broadband mobile multimedia system, comprising: a first step of transmitting a specific user mode to raw data to be transmitted from a base station to a terminal; A second step of searching for a signal transmitted to a specific terminal to find an offset value of a synchronization burst code and then finding a spreading code used for transmission by referring to a predetermined table; And a third step of despreading using the found spreading code and restoring a desired signal.

또한, 본 발명은, 프로세서를 구비한 통신 시스템에, 기지국에서 한 단말기로 송신할 원시 데이터에 특정 사용자 모드를 실어 송신하는 제 1 기능; 특정 단말기에 전달된 신호를 탐색하여 동기용 버스트(Burst) 코드의 옵셋(offset) 값을 찾아낸 후, 소정의 테이블을 참조하여 송신시 사용된 확산코드를 찾아내는 제 2 기능; 및 찾아낸 확산코드를 이용하여 역확산한 후 원하는 신호를 복원하는 제 3 기능을 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록매체를 제공한다.The present invention also provides a communication system including a processor, comprising: a first function of transmitting a specific user mode to raw data to be transmitted from a base station to a terminal; A second function of searching for a signal transmitted to a specific terminal to find an offset value of a synchronization burst code, and then finding a spreading code used for transmission by referring to a predetermined table; And a computer readable recording medium having recorded thereon a program for realizing a third function of despreading using a found spread code and restoring a desired signal.

그리고, 본 명은, 기지국에서는 각 단말기들에 해당하는 옵셋을 미리 결정하여 도 5에 도시된 테이블 정보로 만들어 놓는다. 즉, A단말에는 O 및 B단말에는 1, ··· 등의 방법으로 쌍을 이루게 되다.In addition, the present invention determines the offset corresponding to each terminal in advance in the base station to make the table information shown in FIG. In other words, the A terminal is paired with the O and B terminals by 1, ..., and the like.

만약, 동기용 버스트 M시퀀스 차수가 N이라 하면 2N개의 시퀀스가 존재하게 되며, 단말기마다 옵셋을 달리해서 할당할 경우 2N명의 사용자를 수용하게 된다. 이 옵셋의 정보들은 기지국에서 방송채널 등을 통해 미리 각 단말에게 전달된다.If the synchronization burst M sequence order is N, there are 2 N sequences. If the terminal assigns different offsets, 2 N users are accommodated. Information of this offset is transmitted from the base station to each terminal in advance through a broadcast channel.

또한, 단말기는 동기용 버스트를 자신의 해당 옵셋을 두어 전송하게 된다. 기지국에는 각 단말기로부터 시간상으로 랜덤(Random)하게 수신되는 신호들은 상관기를 이용하여 구별하게 된다.In addition, the terminal transmits the synchronization burst with its corresponding offset. In the base station, signals received randomly in time from each terminal are distinguished using a correlator.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

도 1은 본 발명이 적용되는 이동 멀티미디어 시스템에서의 역방향 송수신 장치의 구성도로서, 크게 송신단과 수신단으로 나뉘어진다.1 is a block diagram of a reverse transmission and reception apparatus in a mobile multimedia system to which the present invention is applied, and is largely divided into a transmitter and a receiver.

상기 송신단은, 데이터 발생부(111)와, 대역 변조부(112)와, 직/병렬 변환부(113)와, 역이산여현변환부(114)와, 반복신호 삽입부(115)와, 병/직렬 변환부(116)와, 스위치(117)와, 전송 필터(118)로 구성된다.The transmitter comprises a data generator 111, a band modulator 112, a serial / parallel converter 113, an inverse discrete cosine converter 114, a repetitive signal inserter 115, / Serial converter 116, a switch 117, and a transmission filter 118.

상기 수신단은, 가산기(121)와, 수신 필터(122)와, 채널 추정기(123)와, 직/병렬 변환부(124)와, 반복신호 삽입부(125)와, 이산여현변환부(126)와, 채널등화부(127)와, 병/직렬 변환부(128)와, 대역 복조기(129)로 이루어진다.The receiving end includes an adder 121, a reception filter 122, a channel estimator 123, a serial / parallel conversion unit 124, a repetitive signal insertion unit 125, and a discrete cosine conversion unit 126. And a channel equalizer 127, a parallel / serial converter 128, and a band demodulator 129.

도 2는 본 발명이 적용되는 무선이동 멀티미디어 시스템의 동기용 버스트에 대한 설명도이다.2 is an explanatory diagram for synchronization burst of a wireless mobile multimedia system to which the present invention is applied.

도 1 및 도 2를 참조하면, 기지국은 단말기에서 송신되는 동기용 버스트 신호를 이용해서 단말기에서 전송하는 신호의 초기 프레임동기를 맞추며, 기지국에서는 단말기의 송신전력값을 이 초기 프레임 동기용 동기 버스트를 이용해서 측정한다.1 and 2, the base station adjusts the initial frame synchronization of the signal transmitted from the terminal by using the synchronization burst signal transmitted from the terminal, and the base station converts the transmission power value of the terminal to this initial frame synchronization synchronization burst. Measure using

이와 같은, 동기용 버스트 신호는 다음과 같은 과정으로 생성한다.Such a synchronization burst signal is generated by the following process.

단말기는 역방향 링크 프레임 동기화를 위해 도 2에서와 같이 N시간마다 프레임 동기 추정용 버스트 신호를 일정시간 보낸 후 데이터 심볼을 전송하게 된다.In order to synchronize the reverse link frame, as shown in FIG. 2, the terminal transmits a data symbol after transmitting a burst signal for frame synchronization estimation every N time.

이때의 동기용 버스트 신호는 랜덤신호이고, 최대길이의 반복 주기 특성을 가진 다음 [수학식 1]의 자기상관(Autocorrelation) 특성을 가진 M-시퀀스(sequence)를 사용한다.The synchronization burst signal at this time is a random signal, and uses an M-sequence having an autocorrelation property of Equation 1 having a repetition period characteristic of maximum length.

여기서, M은 M-시퀀스의 길이이고, δfc는 M-시퀀스의 데이터 속도에 정규화된 캐리어 주파수 옵셋이다.Where M is the length of the M-sequence and δf c is the carrier frequency offset normalized to the data rate of the M-sequence.

그리고, 개방루프(Open-Loop) 전력제어의 경우 수 프레임 동안 동기용 버스트신호인 M-시퀀스 전력의 평균값을 취하여 경로손실 전력을 추정하고 송신전력을 결정한다.In the case of the open-loop power control, the path loss power is estimated and the transmission power is determined by taking the average value of the M-sequence power which is the synchronization burst signal for several frames.

또한, 폐쇄 루프(Closed-Loop) 전력제어의 경우 수신측에서 전력을 측정시 매 프레임 또는 여러 프레임 동안 이 동기용 버스트 신호의 전력을 측정하며 이 측정값을 이용해서 단말기의 전력값 조정을 위한 명령값(즉, ±1임)을 생성한다.Also, in case of closed-loop power control, the power of this synchronization burst signal is measured every frame or several frames when power is measured at the receiving side, and a command for adjusting the power value of the terminal using this measurement value is used. Produce a value (ie ± 1).

도 3은 본 발명이 적용되는 단말기의 구성 개략도로서, 크게 송신단과 수신단으로 나뉘어진다.3 is a schematic configuration diagram of a terminal to which the present invention is applied, and is largely divided into a transmitting end and a receiving end.

상기 송신단은, 데이터 발생부(311)와, 데이터 매퍼(Mapper)(312)와, 승산기(313 내지 316)들과, 가산기(317, 318)들로 구성된다.The transmitter includes a data generator 311, a data mapper 312, multipliers 313 to 316, and adders 317 and 318.

상기 수신단은, 승산기(321 내지 324)들과, 가산기(325, 326)들과, 데이터 디매퍼(327)와, 채널 디코딩부(328)로 이루어진다.The receiver includes multipliers 321 to 324, adders 325 and 326, a data demapper 327, and a channel decoder 328.

도 3에 도시된 바와 같이, 확산코드는 기지국, 채널, 사용자 구별코드로 각각 확산되어 송신되며 사용자를 구별하기 위해서는 해당 사용자 코드를 이용 상관값을 취함으로서 해당 사용자를 구별하게 된다.As shown in FIG. 3, spreading codes are spread and transmitted to a base station, a channel, and a user identification code, respectively. In order to distinguish users, the spreading codes are distinguished by taking a correlation value using the corresponding user code.

도 4는 본 발명에 따른 광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법에 대한 일실시예 흐름도이다.4 is a flowchart illustrating a method for identifying a user using a synchronization burst in a broadband mobile multimedia system according to the present invention.

도 4를 참조하면, 임의의 단말기에서 전달된 신호를 탐색하여(401), 기지국에서 한 단말기로 송신할 원시 데이터에 특정 사용자 코드를 실어 송신단말기로부터 수신된 신호를 확산하여 송신한다(402). 여기서, 확산시 기지국, 채널 및 사용자 구별 코드가 이용된다.Referring to FIG. 4, a signal transmitted from an arbitrary terminal is searched for (401), and a specific user code is loaded on the raw data to be transmitted from the base station to one terminal to spread and transmit the signal received from the transmitting terminal (402). Here, the base station, channel and user identification code is used in spreading.

그리고, 기지국은 한 단말기로부터 수신된 신호의 동기용 버스트의 옵셋(offset) 값을 찾아낸(403) 후, 탐색한 신호의 옵셋값이 미리 설정된 옵셋값 A인지를 확인한다(404). 이때, 확인 결과 미리 설정된 옵셋값과 일치하면, 테이블을 참조하여 확산코드를 찾아낸다(405).The base station finds an offset value of a synchronization burst of a signal received from one terminal (403), and then checks whether the offset value of the found signal is a preset offset value A (404). At this time, if the check result matches the preset offset value, the spreading code is found with reference to the table (405).

이어서, 고속 퓨리에변환 및 부가 과정 등을 거쳐서 원시(raw) 데이터를 추출한(406) 후, 추출한 원시 데이터를 해당 코드를 이용하여 역확산하여(407), 원하는 사용자 신호를 복원한다(408).Subsequently, raw data is extracted through a fast Fourier transform and an addition process (406), and then the extracted raw data is despread using the corresponding code (407) to restore the desired user signal (408).

한편, 옵셋 값의 일치 여부 확인 과정(404)에서의 확인 결과, 일치하지 않으면 옵셋 값 A에 '1'을 가산한(409) 다음, 옵셋 값의 확인 과정(404)으로 넘어간다.On the other hand, as a result of checking whether the offset values coincide (404), if it does not match, '1' is added to the offset value A (409), and then the process proceeds to the checking process of the offset value 404.

도 5는 본 발명에 적용되는 각 단말들에 해당하는 옵셋들의 구조도로서, 기지국이 각 단말기들에 해당하는 옵셋 값들을 테이블 정보로 저장하고 있는 것이다.5 is a structure diagram of offsets corresponding to respective terminals applied to the present invention, in which the base station stores offset values corresponding to the respective terminals as table information.

본 발명의 기술 사상은 상기 바람직한 실시예에 따라 구체적으로 기술되었으나, 상기한 실시예는 그 설명을 위한 것이며 그 제한을 위한 것이 아님을 주의하여야 한다. 또한, 본 발명의 기술 분야의 통상의 전문가라면 본 발명의 기술 사상의 범위내에서 다양한 실시예가 가능함을 이해할 수 있을 것이다.Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

이상에서 설명한 바와 같이 본 발명은, 광대역 이동멀티미디어 시스템에서 동기를 위해 사용되는 동기용 버스트를 이용하여 각 단말기의 신호를 구별하여 송신된 신호의 동기용 버스트만 보고 신속히 사용자를 구별해 낼수 있도록 하므로써, 신호의 처리 속도를 현저히 향상시키고, 이에 따라 전반적인 시스템의 동작속도를 높일 수 있는 장점이 있는 효과가 있다.As described above, the present invention uses the synchronization burst used for synchronization in a broadband mobile multimedia system to distinguish the signals of each terminal so that the user can be quickly identified by only seeing the synchronization burst of the transmitted signals. Significantly improve the processing speed of the signal, and thus has the advantage of increasing the overall operating speed of the system.

Claims (4)

광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법에 있어서,A user identification method using a synchronization burst in a broadband mobile multimedia system, 기지국에서 한 단말기로 송신할 원시 데이터에 특정 사용자 모드를 실어 송신하는 제 1 단계;A first step of transmitting a specific user mode to raw data to be transmitted from a base station to a terminal; 특정 단말기에 전달된 신호를 탐색하여 동기용 버스트(Burst) 코드의 옵셋(offset) 값을 찾아낸 후, 소정의 테이블을 참조하여 송신시 사용된 확산코드를 찾아내는 제 2 단계; 및A second step of searching for a signal transmitted to a specific terminal to find an offset value of a synchronization burst code and then finding a spreading code used for transmission by referring to a predetermined table; And 찾아낸 확산코드를 이용하여 역확산한 후 원하는 신호를 복원하는 제 3 단계The third step of despreading using the found spreading code and restoring the desired signal 를 포함하여 이루어진 광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법.User identification method using a synchronization burst in a broadband mobile multimedia system comprising a. 제 1 항에 있어서,The method of claim 1, 상기 제 2 단계는,The second step, 상기 특정 단말기에 전달된 신호를 탐색하는 제 4 단계;A fourth step of searching for a signal transmitted to the specific terminal; 상기 동기용 버스트(Burst) 코드의 옵셋(offset) 값을 찾아내는 제 5 단계;A fifth step of finding an offset value of the synchronization burst code; 상기 제 4 단계에서 탐색한 신호의 옵셋값이 소정의 옵셋값인지를 확인하는 제 6 단계;A sixth step of checking whether the offset value of the signal found in the fourth step is a predetermined offset value; 상기 제 6 단계에서의 확인 결과 상기 탐색한 신호의 옵셋값이 상기 소정의 옵셋값이면, 상기 소정의 확산코드를 찾는 제 7 단계; 및A seventh step of finding the predetermined spreading code if the offset value of the searched signal is the predetermined offset value as a result of the checking in the sixth step; And 상기 제 6 단계에서의 확인 결과 상기 탐색한 신호의 옵셋값이 상기 소정의 옵셋값이 아니면, 상기 소정의 옵셋 값에 실질적으로 '1'을 가산하는 제 8 단계An eighth step of adding '1' substantially to the predetermined offset value if the offset value of the searched signal is not the predetermined offset value as a result of the checking in the sixth step; 를 포함하여 이루어진 광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법.User identification method using a synchronization burst in a broadband mobile multimedia system comprising a. 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2, 상기 제 3 단계는,The third step, 상기 원시 데이터를 추출하는 제 9 단계;A ninth step of extracting the raw data; 상기 제 9 단계에서 추출한 원시 데이터를 해당 코드를 이용하여 역확산하는 제 10 단계; 및A tenth step of despreading the raw data extracted in the ninth step using a corresponding code; And 상기 원하는 사용자 신호를 복원하는 제 11 단계Eleventh step of restoring the desired user signal 를 포함하여 이루어진 광대역 이동멀티미디어 시스템에서 동기용 버스트를 이용한 사용자 구별 방법.User identification method using a synchronization burst in a broadband mobile multimedia system comprising a. 프로세서를 구비한 통신 시스템에,In a communication system having a processor, 기지국에서 한 단말기로 송신할 원시 데이터에 특정 사용자 모드를 실어 송신하는 제 1 기능;A first function of carrying a specific user mode on the raw data to be transmitted from the base station to one terminal; 특정 단말기에 전달된 신호를 탐색하여 동기용 버스트(Burst) 코드의 옵셋(offset) 값을 찾아낸 후, 소정의 테이블을 참조하여 송신시 사용된 확산코드를 찾아내는 제 2 기능; 및A second function of searching for a signal transmitted to a specific terminal to find an offset value of a synchronization burst code, and then finding a spreading code used for transmission by referring to a predetermined table; And 찾아낸 확산코드를 이용하여 역확산한 후 원하는 신호를 복원하는 제 3 기능Third function to recover desired signal after despreading by using found spread code 을 실현시키기 위한 프로그램을 기록한 컴퓨터로 읽을 수 있는 기록매체.A computer-readable recording medium having recorded thereon a program for realizing this.
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