Abstract:
본 발명은 블록직교 확장 transorthogonal 코드를 이용한 정진폭 다중부호 이진직교 변조 신호의 최적 및 준최적 복조 방법에 관한 것으로서, 본 발명에 따른 최적 복조 방법은 N 비트의 정보 데이터의 조합에 대응하는 2 N 개의 유사 transorthogonal 코드와 상기 변조 신호의 상관값을 계산하는 상관 단계와; 상기 상관단계로부터 계산된 2 N 개의 상관값 중에서 최대값을 선택하고, 상기 최대값에 대응하는 유사 transorthogoanl 코드로부터 상기 변조 신호에 대응하는 N 비트의 정보 데이터를 판정하는 최대값 선택 단계를 포함한다. 파형부호화, 직교코드, Walsh 코드, Hadamard 행렬, 정진폭 부호화, transorthogonal 코드, 블록직교 확장 transorthogonal 코드, 최적 복조, 준최적 복조
Abstract:
본 발명은 정진폭 다중부호 이진직교 변조 신호의 최적 복조 및 준최적 복조 방법 및 그 시스템에 관한 것으로서, 본 발명에 따르면 N 비트의 유저 데이터 및 정진폭 특성을 부여하는 패리티 비트의 서브셋으로부터 직교 부호 및 상기 직교 부호의 위상을 각각 결정하고 상기 서브셋으로부터 각각 결정되는 직교 부호를 가산하여 변조 신호를 생성하는 정진폭 다중부호 이진직교 변조 시스템에서 상기 변조 신호를 최적 복조하기 위하여, 상기 N 비트 유저 데이터의 조합에 대응하는 2 N 개의 유사 직교 부호와 상기 변조 신호의 상관값을 계산하는 상관 단계와, 상기 상관단계로부터 계산된 2 N 개의 상관값 중에서 최대값을 선택하고 상기 최대값에 대응하는 유사 직교 부호로부터 상기 변조 신호에 대응하는 N 비트의 유저 데이터를 판정하는 최대값 선택 단계를 포함한다. 다중부호, 이진직교, 정진폭, 대역 확산, 무선 PAN, Multi-Code, Bi-Orthogonal, CDMA, Constant-Amplitude
Abstract:
Disclosed is a demodulation method for enhancing decoding performance of information bits in a constant-amplitude multi-code biorthogonal modulation communication system, which performs encoding to cause the level of a transmission symbol to be constant.
Abstract:
PURPOSE: An improved method for estimating a frequency offset of a mobile communication system is provided to obtain a diversity gain and improve the accuracy of the frequency estimation by combining estimated values of each frequency offset. CONSTITUTION: An estimating process of frequency offset is performed in each sub channel, respectively. A frequency offset combination process is performed to combine the estimated values of each frequency offset. A mobile communication system is formed with a multi-input/output channel modulation system, a transmission diversity system, a multi-code division multi-access system or a binary code division multi-access system. The multi input/output channel modulation system or transmission diversity system perform a frequency offset estimation process by using a predetermined mathematical expression.
Abstract:
PURPOSE: A device for generating an accord in a network toy using a wireless communication and a method thereof are provided to activate an education by creating an accord using a network doll and toy, thereby increasing competitive powers of children. CONSTITUTION: If users operate terminals and constitute a network(S300), it is checked whether each terminal is connected(S301). An education or a game is started(S303). In the case that a game is started, the user controls a switch of the terminal for playing the game. After playing the network game, a winner is decided(S304), and a terminal of the winner is designated as the master terminal(S305). A controller of the master terminal constitutes a network based on the master among slave terminals according as the user inputs the switch(S306) and selects a music and an accord according as the user inputs the switch(S307). If a music is selected, the slave terminals generate each accord in accordance with a control signal of the master terminal, and a chorus is progressed(S308). If the music is terminated, the controller of the master terminal releases the constitution of the network(S310).
Abstract:
본 발명은 블록직교 확장 transorthogonal 코드를 이용한 정진폭 다중부호 이진직교 변조 신호의 최적 및 준최적 복조 방법에 관한 것으로서, 본 발명에 따른 최적 복조 방법은 N 비트의 정보 데이터의 조합에 대응하는 2 N 개의 유사 transorthogonal 코드와 상기 변조 신호의 상관값을 계산하는 상관 단계와; 상기 상관단계로부터 계산된 2 N 개의 상관값 중에서 최대값을 선택하고, 상기 최대값에 대응하는 유사 transorthogoanl 코드로부터 상기 변조 신호에 대응하는 N 비트의 정보 데이터를 판정하는 최대값 선택 단계를 포함한다. 파형부호화, 직교코드, Walsh 코드, Hadamard 행렬, 정진폭 부호화, transorthogonal 코드, 블록직교 확장 transorthogonal 코드, 최적 복조, 준최적 복조
Abstract:
PURPOSE: A constant amplitude binary orthogonal modulator/demodulator is provided to reduce the power consumption of a communication system by performing a constant amplitude binary orthogonal modulation process for transmission data. CONSTITUTION: A serial/parallel converter(200) is used for converting serial data to a data bit, a group of data bits, and a plurality of groups of data bits according to a data rate control signal. A constant amplitude encoder(210) is used for generating parity bits of each group by combining the plural groups of data bits. An orthogonal code generator(220) is used for generating different groups of orthogonal codes. A plurality of binary orthogonal modulators(230,240,250,260) are used for selecting one orthogonal code from each group and performing a binary orthogonal modulation process. A parallel adder(270) is used for adding output signals of the plural binary orthogonal modulators in parallel.
Abstract:
PURPOSE: A method for interpolating a frequency and a phase offset to improve resolution of DFT(Discrete Fourier Transform) and FFT(Fast Fourier Transform) is provided to improve the frequency of DFT algorithm and the phase resolution without increasing a DFT size by using an internally dividing point. CONSTITUTION: A sampling process is performed to sample received signals according to a predetermined period(101). The received data stream is converted to a frequency area to obtain a frequency spectrum(102). Two continuous samples having the maximum sum are selected from continuous samples of the frequency area(103). A fine frequency offset is estimated by using an internally dividing point of the selected samples(104). A total frequency offset is obtained by adding a coarse frequency offset to the estimated fine frequency offset(105).
Abstract:
PURPOSE: An envelope binary orthogonal modulation and demodulation system is provided to execute envelope binary orthogonal modulation for data so as to transmit the data at a mass data rate and a variable data rate. CONSTITUTION: An envelope binary orthogonal modulator consists of a serial/parallel converter(200), an envelope encoder(210), an orthogonal code generator(220), a plurality of binary orthogonal modulation parts(230,240,250,260), and a parallel combiner(270). The serial/parallel converter(200) converts in-phase or orthogonal phase serial data, separated from a signal splitter, into a data bit(b1), a group of data bits(b0-b2), or many groups of data bits((b0-b2),(b3-b5)(b6-b8)) according to a data rate control signal. The envelope encoder(210) combines many groups of data bits((b0-b2),(b3-b5)(b6-b8)) converted at the serial/parallel converter(200) respectively and generates a plurality of parity bits(r0,r1,r2). The orthogonal code generator(220) generates many groups of orthogonal codes((c0-c3)(c4-c7)(c8-c11)(c12-c15)). The binary orthogonal modulation parts(230,240,250,260) select their respective orthogonal codes among the orthogonal codes((c0-c3)(c4-c7)(c8-c11)(c12-c15)) according to many groups of data bits((b0-b2),(b3-b5)(b6-b8)) and the parity bits(r0,r1,r2) and adjust the codes. The parallel combiner(270) sums up the orthogonal codes, outputted from the binary orthogonal modulation parts(230,240,250,260), in parallel and generates envelope binary orthogonal modulation data.