Double-character erasure correcting system
Abstract
Abstract INFORMATION CHARACTERS OF L-BIT LENGTH ARE ENCODED IN A CONVOLUTION CODE OF RATE UP TO (2K-1)/2K, (WHERE 2 -1 IS AN EVEN MULTIPLE OF 2K-1) AND THEN TRANSMITTED OVER A COMMUNICATION CHANNEL TO A RECEIVING TERMINAL. THE RECEIVED CHARACTERS ARE PROCESSED TO (1) OBTAIN TWO PARTIAL SYNDROMES S0 AND S1 ASSOCIATED WITH THE TWO MOST RECENTLY RECEIVED BLOCKS OF CHARACTERS, EACH BLOCK CONTAINING 2 CHARACTERS, AND (2) DETERMINE CHARACTER ERASURES, I.E., THE POSITION OF ERRORS. DETERMINATION OF CHARACTER ERASURES IS DONE BY PERFORMING SIGNAL QUALITY CHECKS ON THE CHARACTERS SUCH AS NULLZONE DETECTION. THE TWO SYNDROMES SO AND S1 ARE THEN UTILIZED TO CORRECT THE CHARACTER ERASURES. SIGNAL-CHARACTER ERASURES IN ANY 2-CHARACTER BLOCK CAN BE CORRECTED WITHOUT THE REQUIREMENT OF A GUARD SPACE. IN ADDITION, DOUBLE-CHARACTER ERASURES IN ANY 2 -CHARACTER BLOCK CAN BE CORRECTED PROVIDED THE SUBSEQUENT BLOCK IS ERROR FREE.
Inventors
- 👤 Shih Y Tong
Bibliographic Details
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