Apparatus and methods for use in transmitting and receiving a di

Details Apparatus and methods for use in transmitting and receiving a di Apparatus and methods for use in transmitting and receiving a di

1995-03-09

1997-09-23

Baker, Stephen M.

Excavating

341 58, 371 401, G11B 2018, H03M 700, H03M 1300, H04L 25497

Patent

active

056712367

ABSTRACT:
Apparatus and methods for transmitting and receiving a digital data signal. At the transmitter side, packets of p m-bit digital words in a digital signal are error protection encoded to produce error protection encoded packets of n m-bit digital words making up an error protection signal, where n>p. The error protection encoded packets are converted into converted packets of digital words to form a channel encoded signal, which signal is supplied to a transmission medium. The conversion involves use of a generator for supplying a fixed auxiliary packet of n digital words; a calculation unit for calculating in a Galois field GF(2.sup.m) a converted digital word in accordance with the formula DW.sub.i +.alpha..FW.sub.i, where DW.sub.i and FW.sub.i are the binary values corresponding to the i-th digital words in the packet to be converted and the auxiliary packet, respectively, .alpha. is a binary value, and the converted digital word is the i-th converted digital word in the converted packet, where i runs from 1 to n; and a digital sum value determining unit for determining the digital sum value of at least a converted packet in the channel encoded signal. The calculation unit determines a value .alpha..sub.def with the converted digital words obtained by the Galois field GF(2.sup.m) calculation of DW.sub.i +.alpha..sub.def. FW.sub.i so as to obtain the converted packet, the value .alpha..sub.def for .alpha. being such that a running digital sum value of the converted packets shows a desired pattern as a function of time. The receiver side operates in an opposite manner.

REFERENCES:
patent: 5136436 (1992-08-01), Kahlman
patent: 5465260 (1995-11-01), Zook

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