Transmitting and receiving apparatus and method including punctured convolutional encoding and decoding
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04L-027/00
출원번호
US-0065292
(1993-05-24)
발명자
/ 주소
Tzukerman Shimon (Israel CA ILX) Esserman James N. (San Diego CA)
출원인 / 주소
Comstream Corporation (San Diego CA 02)
인용정보
피인용 횟수 :
61인용 특허 :
0
초록▼
Digital data are communicated from a transmitter to a terrestrial receiver by encoding the data into first and second ½rate convolutional encoded signals during different periods. During the different periods, the convolutional signals are encoded into first and second forward error correction convo
Digital data are communicated from a transmitter to a terrestrial receiver by encoding the data into first and second ½rate convolutional encoded signals during different periods. During the different periods, the convolutional signals are encoded into first and second forward error correction convolutional encoded signals having ⅔and 6/7 punctured codes transmitted to the receiver via a satellite. Power emitted from the satellite during the first period is 3 db lower than that emitted during the second period. An antenna dish having a diameter no greater than about 1 meter is at the receiver responsive to both signals emitted from the satellite. The encoded signals include sequential bits P1(0), P1(1), etc. and P2(0), P2(1), etc. At the ⅔rate, parallel punctured bit streams respectively including sequential bits P1(0), P2(1), P2(2), P1(4) and P2(0), P1(2), P2(3), P2(4) are derived. At the 6/7 rate, the punctured bit streams are respectively P1(0), P2(1), P1(3), P1(5), P2(6), P2(8), P2(10) and P2(0), P2(2), P2(4), P1(6), P2(7), P1(9), P1(11). Simultaneously derived bits of the parallel punctured bit streams simultaneously QPSK modulate a carrier. A punctured clock is combined with the serial signal to derive a pair of wavetrains G1 and G2 including the I and Q channel sequential bits and dummy bits inserted into the serial signal. The receiver responds to the QPSK carrier to derive a serial signal having sequential bits so channel I and Q sequential bits I(0), I(1), I(2) etc. and Q(0), Q(1), Q(2) etc. at the same time slots tk, tk+1, tk+2 are sequentially derived as I(0), Q(0), I(1), Q(1), I( 2), Q(2) etc.
대표청구항▼
A method of communicating a digital data signal from a transmitter to a receiver during mutually exclusive transmitting periods comprising encoding the digital data signal into a ½rate convolutional encoded signal during each of said periods; during the first transmission period (1) encoding the con
A method of communicating a digital data signal from a transmitter to a receiver during mutually exclusive transmitting periods comprising encoding the digital data signal into a ½rate convolutional encoded signal during each of said periods; during the first transmission period (1) encoding the convolutional encoded signal into a first forward error correction convolutional encoded signal having a ⅔punctured code and (2) transmitting the encoded first forward error correction signal to the receiver via a geosynchronous satellite; during the second transmission period (1) encoding the convolutional encoded signal into a second forward error correction convolutional encoded signal having a 6/7punctured code and (2) transmitting the encoded second forward error correction signal to the receiver via the geosynchronous satellite; controlling the power emitted from the satellite so the power emitted from the satellite of the encoded forward error correction signal having the ⅔punctured code during the first period is appreciably lower than the power emitted from the satellite of the encoded forward error correction signal having the 6/7punctured code during the second period; during both the first and second periods receiving the encoded forward error correction signals emitted from the satellite at the receiver with an antenna including a dish having a diameter no greater than about 1 meter, and decoding the received encoded forward error correction signals into a further signal that is an approximate replica of the digital data signal.
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