Communication channel accuracy measurement
First Claim
1. 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.
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Accused Products
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.
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Citations
12 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 11, 12)
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6. 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). - View Dependent Claims (7, 8, 9, 10)
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Specification