[특허]Signal modulation employing a pseudo-random sequence of pilot symbols

Signal modulation employing a pseudo-random sequence of pilot symbols 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-007/04 H04L-001/00
출원번호	US-0474332 (1995-06-07)
발명자 / 주소	Marchetto Robert F.,CAX Stewart Todd A.,CAX Fawcett Glenn S.,CAX
출원인 / 주소	Glenayre Electronics, Inc.
대리인 / 주소	Christensen, O'Connor, Johnson & Kindess PLLC
인용정보	피인용 횟수 : 40 인용 특허 : 0

초록 ▼

A modulator that modulates and encodes data using data symbols, interspersed with pilot symbols, for transmission to another modem, and a demodulator that decodes data symbols of a signal received from another modem. In the demodulator, a received signal is sampled at four times the symbol rate. The sampled signal is converted to quadrature signals and low-pass filtered to produce a complex baseband signal. Data symbols in the complex baseband signal are sampled in synchronization with the start of each symbol based on the pilot symbols that are interspersed in the signal. By processing the pilot symbols, full modem synchronization is maintained down to a very low signal-to-noise ratio, through noise bursts, or even when the data symbols representing data are replaced by predefined sequences of data symbols that convey the dots and dashes of Morse code identifying the station transmitting the modulated signal. The continued presence of pilot symbols interspersed with the sequences of data symbols conveying Morse code prevents loss of synchronization between the transmitting station and the receiving station. The pilot symbols are also used to update equalizer tap coefficients in an equalizer of the demodulator, thereby minimizing errors in the output data caused by channel fading, noise, and other effects. In addition, the sequence of pilot symbols is used to delimit data frames, so that bit synchronization and frame synchronization in the data are not required.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [13.] A method for producing a signal that is modulated by a message signal and pilot symbols comprising the steps of:(a) converting the message signal into a sequence of data symbols;(b) producing a random sequence of pilot symbols for repeated use in producing the modulated signal;(c) selecting between the data symbols and the pilot symbols to periodically select at least one data symbol of the sequence of data symbols and to intersperse the selected at least one data symbol of the sequence of data symbols between two consecutive pilot symbols of the random sequence of pilot symbols; and(d) producing a passband signal as a function of the pattern of the data symbols and the interspersed pilot symbols.

이 특허를 인용한 특허 (40)

Cho, Il Soo; Cho, Hyeon Cheol; Park, Jong Sun; Choi, In Hwan; Lee, Hyoung Gon; Song, Won Gyu; Kim, Seung Man; Kim, Jong Moon; Kim, Jin Woo; Kwak, Kook Yeon; Kim, Byoung Gill, Broadcast receiving system and method for processing broadcast signals.
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Cho, Il Soo; Cho, Hyeon Cheol; Park, Jong Sun; Choi, In Hwan; Lee, Hyoung Gon; Song, Won Gyu; Kim, Seung Man; Kim, Jong Moon; Kim, Jin Woo; Kwak, Kook Yeon; Kim, Byoung Gill, Broadcast receiving system and method for processing broadcast signals.
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Cho, Il Soo; Cho, Hyeon Cheol; Park, Jong Sun; Choi, In Hwan; Lee, Hyoung Gon; Song, Won Gyu; Kim, Seung Man; Kim, Jong Moon; Kim, Jin Woo; Kwak, Kook Yeon; Kim, Byoung Gill, Broadcast receiving system and method for processing broadcast signals.
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Qin Zhang, Digital QAM modulator using post filtering carrier recombination.
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Lundby, Stein A.; Razoumov, Leonid; Bao, Gang; Wei, Yongbin, Method and apparatus for determining a data rate in a high rate packet data wireless communications system.
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Stephen Rocco Carsello, Method and apparatus for facilitating reception of a signal on one of a plurality of contiguous channels.
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Lundby, Stein A.; Razoumov, Leonid; Bao, Gang, Method and apparatus for high rate packet data and low delay data transmissions.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani, Roberto; Bender, Paul E.; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
상세보기
Padovani, Roberto; Bender, Paul E; Black, Peter J.; Grob, Matthew S.; Hinderling, Jurg K.; Sindhushayana, Nagabhushana T.; Wheatley, III, Charles E., Method and apparatus for high rate packet data transmission.
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Padovani,Roberto; Bender,Paul E.; Black,Peter J.; Grob,Matthew S.; Hinderling,Jurg K.; Sindhushayana,Nagabhushana T.; Wheatley, III,Charles E., Method and apparatus for high rate packet data transmission.
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Kwak, Jaeyoung; Olesen, Robert L.; Bultan, Aykut; Zeira, Eldad M.; Koo, Changsoo; Ozluturk, Fatih M.; Huang, Yuejin; Pasad, Kalpendu R., Method and apparatus for implementing space frequency block coding in an orthogonal frequency division multiplexing wireless communication system.
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Kwak, Jaeyoung; Olesen, Robert L.; Bultan, Aykut; Zeira, Eldad M.; Koo, Changsoo; Ozluturk, Fatih M.; Huang, Yuejin; Pasad, Kalpendu R., Method and apparatus for implementing space frequency block coding in an orthogonal frequency division multiplexing wireless communication system.
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Kwak, Jaeyoung; Olesen, Robert Lind; Bultan, Aykut; Zeira, Elad; Koo, Chang-Soo; Ozluturk, Fatih; Huang, Yuejin; Pasad, Kalpendu R., Method and apparatus for implementing space frequency block coding in an orthogonal frequency division multiplexing wireless communication system.
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Kwak, Jaeyoung; Olesen, Robert Lind; Bultan, Aykut; Zeira, Eldad; Koo, Chang-Soo; Ozluturk, Fatih; Huang, Yuejin; Pasad, Kalpendu R., Method and apparatus for implementing space frequency block coding in an orthogonal frequency division multiplexing wireless communication system.
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Holtzman, Jack; Chen, Tao, Method and apparatus for predicting favored supplemental channel transmission slots using transmission power measurements of a fundamental channel.
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Padovani, Roberto; Black, Peter J.; Sindhushayana, Nagabhushana T., Pilot reference transmission for a wireless communication system.
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Padovani, Roberto; Black, Peter John; Sindhushayana, Nagabhushana T., Pilot reference transmission for a wireless communication system.
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Padovani,Roberto; Black,Peter J.; Sindhushayana,Nagabhushana T., Pilot reference transmission for a wireless communication system.
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Signal modulation employing a pseudo-random sequence of pilot symbols 원문보기

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