초록 ▼

A system and method is disclosed for wireless transmission of information which is subject to fading by using a RF carrier modulated with a subcarrier modulated with the information. The system has a bus interface which communicates with a digital signal processor which controls the transmitting and

A system and method is disclosed for wireless transmission of information which is subject to fading by using a RF carrier modulated with a subcarrier modulated with the information. The system has a bus interface which communicates with a digital signal processor which controls the transmitting and receiving circuitry functions. The bus interface is for connection to a computer bus which is connected to a computer which originates information to be transmitted by transmitting circuitry and which receives information from receiving circuitry. The digital signal processor provides first and second encoded information streams each comprising the information to be transmitted with the second stream being delayed by a time delay interval with respect to the first stream which is equal to or greater than the fading interval. The first and second encoded information streams modulate cycles of the subcarrier to produce first and second parallel information streams which are time offset by the time delay interval. The receiving circuitry has a detector for detecting transmitted first and second parallel information streams with the second parallel information stream being delayed from the first parallel information stream by the time delay interval. The digital signal processor determines if faded information is present in the frames of the detected first and second parallel information streams by processing the error correction code therein to determine if a number of bit errors are present which exceed the bit error correction capacity of the error correction code. The digital signal processor places an error marker within the detected first and second parallel information streams to mark each faded information unit and controls replacement of each error marker within at least one of the first and second parallel information streams with replacement data bits within a frame in one of the first and second parallel information streams which were time offset at transmission by the time delay interval to produce error free transmitted information.

대표청구항 ▼

[ I claim:] [1.] Transmitting circuitry for wireless transmission of information by modulating a transmitted carrier with a subcarrier. with transmission of the information being subject to fading for a time interval, the transmitting circuitry comprising:a processor, responsive to a source of infor

[ I claim:] [1.] Transmitting circuitry for wireless transmission of information by modulating a transmitted carrier with a subcarrier. with transmission of the information being subject to fading for a time interval, the transmitting circuitry comprising:a processor, responsive to a source of information, for providing a first encoded information stream which comprises the information to be transmitted and a second encoded information stream which also comprises the information to be transmitted with the second encoded information stream being delayed by a time delay interval with respect to the first information stream which is equal to or greater than the time interval of the fading; andan encoder, responsive to the first and second encoded information streams, for modulating the subcarrier with the first and second encoded information streams to produce first and second parallel information streams modulated on cycles of the subcarrier with the first parallel stream containing the first encoded information stream, with the second parallel stream containing the second encoded information stream and with the first parallel information stream as modulated on the subcarrier being time displaced from the second parallel information stream by the time delay interval.