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Symbol encoding and decoding architecture for trellis-coded modulation in gigabit ethernet
Symbol encoding and decoding architecture for trellis-coded modulation in gigabit ethernet
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机译:千兆以太网中网格编码调制的符号编码和解码体系结构
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摘要
A method of encoding a plural-bit data word as a plurality of multi-level symbols, where each of the plurality of multi-level symbols has a value selected from a predetermined plurality of levels. The method includes first translating each one of the selected bit positions of the plural-bit data word to one of the levels. When the contents of a predetermined one of the bits of the data word is a predetermined value, the method provides a second translation of each of the selected bit positions of the plural-bit data word to one of the levels. The method further includes generating a plural-bit offset word from predetermined bit positions of the data word and generating the multi-level symbols by addition of the offset word to the translated levels. One embodiment of the invention provides that the multi-level symbols are assigned a five-level code and the codes are treated as twos-complement numbers.
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