[특허]High speed data communication system using phase shift key coding

High speed data communication system using phase shift key coding 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-025/49
출원번호	US-0557322 (1990-07-23)
발명자 / 주소	Walker Harold R. (78 Oliver Ave. Edison NJ 08817)
인용정보	피인용 횟수 : 80 인용 특허 : 0

초록 ▼

An improved binary data communication system employs an improved VPSK encoding procedure wherein each input data bit has a bit period of M clock periods, and the data bit polarity changes are phase shift key coded with waveform widths of M/M, M+1/M, and M+2/M bit periods wherein M is an even integer greater than 3. Each of the data bits (except the last one in an encoding cycle) is encoded in an encoding signal which switches back and forth between “1”and “0”polarities and has assigned widths representing whether or not the polarity of the data bit is changed from that of the previous data bit, and whether it is the last (M-1th) polarity change in the encoding cycle. At the receiving end, a complementary procedure is used to decode the encoded signal. For transmission, the encoded signal is filtered for higher order harmonics and integrated in order to provide a sine wave output shifted 90 degrees in phase. Upon reception, the received signal is differentiated and a zero crossover detector is used to regenerate the encoded signal for decoding. The improved encoding technique can achieve Nyquist efficiencies of 10, 12.6, and 15.3 bits/Hz-bandwidth, or higher, for M equal to 6, 8, and 10 modulation levels, respectively. The encoded signal spectrum fits typically within about 1/6 of the bandwidth of the baseband NRZ signal. The encoded signal is particularly useful for transmission at high data rates in telephone, RF modulated carriers, and other transmission systems.

대표청구항 ▼

An encoder apparatus for use in a high speed data transmission system for transmitting an input NRZ signal over a communications path as a data signal, said NRZ signal representing a series of binary data bits of “1”and “0”polarities clocked at a given clock rate, comprising: polarity change detecting means responsive to said NRZ signal for detecting whether a current data bit of said NRZ signal has the same or a changed polarity as a previous data bit, wherein each data bit of said NRZ signal has a bit period of M clock periods; counting means for maintaining a count of the number of polarity changes of the data bits in each encoding cycle defined from a beginning reset point of said NRZ signal; encoding means for encoding an encoded signal representing said NRZ signal, said encoded signal having a waveform which switches between two opposing polarities with each polarity change of the data bits in each encoding cycle, wherein the polarity of the encoding signal is switched with widths of M/M, M+1/M, and M+2/M bit periods after a previous polarity switch depending upon whether a polarity change is detected by said polarity change detecting means and the count maintained by said counting means, as follows: (1) a width of M/M when a current data bit is the same as a previous data bit (no polarity change); (2) a width of M+1/M when a current data bit has a polarity that is changed from that of a previous data bit, the count of said counting means being thereupon indexed by one; (3) a width of M+2/M when a current data bit has a polarity that is changed from that of a previous data bit and the count of said counting means including the current polarity change is equal to M-1 and a 101 bit pattern is present in the data stream to the encoding means, the count of said counting means being thereupon reset to define the beginning reset point for the next encoding cycle, wherein, in all of the above said means, M is a positive even integer greater than 3.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

High speed data communication system using phase shift key coding 원문보기

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High speed data communication system using phase shift key coding 원문보기

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