| 摘要 |
A method and apparatus for multi-level encrypted encoding and decoding of digital signals, which includes utilizing only one type of encoder and one type of decoder. This can be either the same encoder and decoder used in throughout the process, or multiple, identical encoders and decoders. This allows the system to compensate for atmospheric degradation with higher bandwidth efficiency and a simplified receiver structure. The invention further identifies a 2<j >symbol generation technique that maps in disjoint regions of X-dimensional space, which allows different data bits to be eliminated from the decoding scheme and maximizes the number of independent data substreams that can be maintained.
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