Technique for improving the operation of decision feedback equalizers in communications systems utilizing error correction
First Claim
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1. Receiver apparatus for use in a communications system comprisinga decision feedback equalizer having an output;
- a plurality of first decoders connected to said decision feedback equalizer; and
means for coupling data from said decision feedback equalizer output to said plurality of first decoders such that successive signals from said decision feedback equalizer output are coupled to a different first decoder in said plurality.
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Abstract
The combined benefits of decision feedback equalization and error correction coding are realized in a communications system by the use of a plurality of coders and decoders respectively disposed in the transmitter and receiver. The plurality of encoders and decoders is used to interleave the data symbols so that each coder and decoder is operative upon every Mth symbol, where M is the number of coders or decoders. By a judicious choice of M, both the probability of noise impairing the recovery of successive symbols and the error propagation effects inherent in decision feedback equalizers are reduced.
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14 Claims
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1. Receiver apparatus for use in a communications system comprising
a decision feedback equalizer having an output; -
a plurality of first decoders connected to said decision feedback equalizer; and means for coupling data from said decision feedback equalizer output to said plurality of first decoders such that successive signals from said decision feedback equalizer output are coupled to a different first decoder in said plurality. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of recovering data in a communications system, said method comprising the steps of
coupling said data to a decision feedback equalizer having an output; - and
coupling said data at said output to a plurality of decoders in a cyclic fashion such that successive data outputs of said decision feedback equalizer are coupled to a different decoder in said plurality of decoders. - View Dependent Claims (9, 10)
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11. A transmitter for use in a communications system comprising
a first encoder for coding data symbols using a first coding scheme, said first encoder forming a sequence of data symbols in a predetermined time order; -
a plurality of second encoders for further coding the data symbols outputted by said first encoder using a second coding scheme different from said first coding scheme; means for coupling the outputs of said first encoder to said plurality of second encoders such that successive outputs of said first encoder are coupled to a different second encoder in said plurality; and means for coupling the outputs of said plurality of second encoders in a cyclic fashion to a transmission channel in a manner which restores said predetermined time order. - View Dependent Claims (12, 13)
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14. A communications system comprising
a transmitter comprising a plurality of coders; -
means for coupling symbols to be transmitted from said plurality of coders in a cyclic fashion so that successive ones of said symbols are coupled from different ones of said coders; and a receiver comprising a decision feedback equalizer; a plurality of decoders connected to said decision feedback equalizer; and means for coupling data from said decision feedback equalizer output to said plurality of decoders such that successive data from said decision feedback equalizer output are coupled to a different decoder in said plurality.
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Specification