Patent
Method and apparatus for combining encoding and modulation
TLDR
In this paper, a method and apparatus for combining encoding and modulation creates signal sets from available amplitude and phase modulations by indexing ordered subspaces, which can be in either finite block or convolutional form, depending on the natural format of the desired transmission.Abstract:
A method and apparatus for combining encoding and modulation creates signal sets from available amplitude and phase modulations by indexing ordered subspaces. The subspaces need not be limited to the class of subspaces known as binary subspaces. The resultant signal sets, for a preselected power and bandwidth, are widely separated and unlikely to be confused by the effects of channel noise. Such signals can be in either finite block or convolutional form, depending on the natural format of the desired transmission. Further according to the invention are basic apparatus for encoding and modulating as well as demodulating and decoding a signal in accordance with the invention. Specifically, a method is provided for decoding the incorporates a specific type of decoding/demodulation techniques which develops accurate estimates of the information from the received signal in a computationally efficient manner and which permits high speed operation using softdecision decoders.read more
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References
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TL;DR: A coding technique is described which improves error performance of synchronous data links without sacrificing data rate or requiring more bandwidth by channel coding with expanded sets of multilevel/phase signals in a manner which increases free Euclidean distance.
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TL;DR: A new multilevel coding method that uses several error-correcting codes that makes effective use of soft-decisions to improve the performance of decoding and is superior to other multileVEL coding systems.
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TL;DR: This paper constructs a class of optimum signal space codes using short binary block (as opposed to convolutional) codes and presents a simplified decoding procedure that is asymptotically optimum.
Patent
Error-correcting coding system
TL;DR: In this paper, a method and apparatus for constructing long error-correcting codes from one or more shorter error correcting codes, referred to as subcodes, and a bipartite graph is presented.
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