US 6,928,592 B2 · Communication channel accuracy measurement

Abstract

This invention relates to the measurement of the accuracy of a communication channel. The invention provides a method and apparatus for determining channel degradation information for a communications channel, in which a known data sequence is generated within a transmitter; a coded data sequence based on the known data sequence is transmitted using the transmission channel; said known data sequence is generated within the receiver; and the known data sequence generated within the receiver is compared with a decoded data sequence based on data received via the channel to provide said channel degradation information; wherein a source encoder in the transmitter has the ability to generate a predetermined output data sequence in response to a predetermined input data sequence; the known data sequence is generated within the transmitter and within the receiver in dependence upon the predetermined output data sequence; and the decoded data sequence is measured prior to source decoding in the receiver.

Claims12

Dependent claims

A method of determining channel degradation information for a communications channel, comprising the steps of

generating a known data sequence within a transmitter;
transmitting a coded data sequence based on the known data sequence via said transmission channel;
generating said known data sequence within the receiver;
and
comparing the known data sequence generated within the receiver with a decoded data sequence based on data received via the channel to provide said channel degradation information;
characterised in that
a source encoding substep of the transmitting step has the ability to generate a predetermined output data sequence in response to a predetermined input data sequence;
said known data sequence is generated within the transmitter and within the receiver in dependence upon said predetermined output data sequence;
and
said decoded data sequence is measured prior to a source decoding step in the receiver.

7 more elements

An apparatus for determining channel degradation information for a communication channel comprising

a transmitter (52,54) comprising
means (12) for generating a known data sequence;
means (54) for transmitting, via the communication channel, a coded data sequence based on the known data sequence;
and
a receiver (56) comprising
a decoder (48, 28, 32, 36, 40), having a source decoder (48), arranged to decode a received coded data sequence and arranged to generate a decoded data sequence;
means (66) for generating a local copy of said known data sequence;
a comparator (60,62) arranged to compare the decoded data sequence with the local copy of said known data sequence to generate said channel degradation information;
characterised in that
the means for generating a known data sequence in the transmitter (52) comprises a source encoder (12) in which a predetermined output data sequence is generated in dependence upon a predetermined input data sequence, and is arranged to generate the known data sequence in dependence upon the predetermined output data sequence;
the means (64,66) for generating a local copy of the known data sequence is arranged to generate the known data sequence in dependence upon the predetermined output data sequence;
and
the decoder (48, 28, 32, 36, 40) is arranged to generate the decoded data sequence in the receiver prior to decoding by the source decoder (40).

10 more elements

Dependencies are inferred from the claim text.

Communication channel accuracy measurement

Life of this patent

Communication channel accuracy measurement

Life of this patent

Abstract

Claims12