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专利名称：Method and apparatus for increasing the
spectral efficiency of dense wavelengthdivision multiplexed systems
发明人：Rajiv Laroia,James Emery Mazo,Jason Blain
Stark
申请号：US091431申请日：19980828公开号：US06542276B1公开日：20030401
专利附图：
摘要：A method for increasing the spectral efficiency of a transmitted signal. The
signal includes a sequence of symbols selected from a set of symbols with each of thesymbols having an associated numerical value. A symbol is output from the sequencessymbols. A spectral sum is determined by summing the numerical values of all thesymbols that have been previously output. A first sum is calculated by adding thenumerical value of the next symbol to be output to the spectral sum. A second sum iscalculated by subtracting the numerical value of the next symbol to the output from thespectral sum. The next symbol will be output with the positive phase if the first sum isless than the second sum. The next symbol will be output with the negative phase if thefirst sum is greater than the second sum. If the first sum equals the second sum the nextsymbol is output with either a positive phase or negative phase.
申请人：LUCENT TECHNOLOGIES INC.
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