| 摘要 |
A HIERARCHICAL QAM TRANSMISSION SYSTEM INCLUDES A HIERARCHICAL QAM TRASMITTER (100), RESPONSIVE TO A FIRST AND A SECOND DATA STREAM. THE HIERARCHICAL QAM TRANSMITTER TRANSMIT A HIERARCHICAL QAM SIGNAL CONSISTING OF A LEVEL 1 SIGNAL, REPRESENTING THE FIRST DATA STREAM, AND HAVING AN UBCODED FIRST BIT ERROR RATE PERFORMANCE; AND A LEVEL 2 SIGNAL, REPRESENTING THE SECOND DATA STREAM, AND HAVING AN UNCODED SECOND BIT ERROR RATE PERFORMANCE LOWER THAN THE FIRST BIT ERROR RATE PERFORMANCE. A HIERARCHICAL QAM RECEIVER (300) IS COUPLED TO THE HIERARCHICAL QAM TRANSMITTER (100). THE HIERARCHICAL QAM RECEIVER RECEIVES THE HIERARCHICAL QAM SIGNAL AND PRODUCES FIRST AND SECOND RECEIVED DATA STREAMS. FIRST ERROR DETECTION/CORRECTION = CIRCUITRY (102,304) PROCESSES THE FIRST DATA STREAM BY ENCODING THE FIRST DATA STREAM BY ENCODING THE FIRST DATA STREAM USING A CODE HAVING A FIRST DETECTION/CORRECTION POWER. SECOND ERROR DETECTION/CORRECTION CIRCUITRY (108,312) PROCESSES THE SECOND DATA STREAM BY ENCODING THE SECOND DATA STREAM USING A CODE HAVING A SECOND ERROR DETECTION/CORRECTION POWER. THE POWER OF THE RESPECTIVE CODES USED BY THE FIRST AND SECOND ERROR DETECTION/CORRECTION CIRCUITRY ARE SUCH THAT THE CODED BIT ERROR RATE OF THE FIRST DATA STREAM IS MORE CLOSELY MATCHED TO THE CODED BIT ERROR RATE OF THE SECOND DATA STREAM IS MORE CLOSELY MATCHED TO THE CODED BIT ERROR RATE OF THE SECOND DATA STREAM.(FIG 1)
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