| 摘要 |
A method and receiver systems for demodulating and decoding a hierarchically modulated signal, e.g. an 8PSK signal, are disclosed. An exemplary method includes demodulating and processing ( 502 ) the hierarchically modulated signal ( 202 ) to produce symbols ( 212 ) from the first modulation at the first hierarchical level, applying information ( 504 ) from a plurality of the symbols from the first modulation at the first hierarchical level in subtracting ( 214 ) from the demodulated hierarchically modulated signal to obtain the second modulation at the second hierarchical level and processing ( 506 ) the second modulation at the second hierarchical level to produce second symbols ( 222 ) from the demodulated second signal. The hierarchically modulated signal comprises a non-uniform 8PSK signal. Applying the information from the plurality of the symbols from the first modulation can be achieved by applying the symbols after error correction. A decision-directed demodulation of the first modulation can also be used to further improve performance.
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