| 摘要 |
<p>A transmission system for transmitting a data signal with an analog passband signal through a analog transmission line (300). The data signal is transformed (21) to a signal representing a descrete data signal point in a vector signal space. The analog passband signal is transformed (25) to a base band signal, and the base band signal is superimposed (22) on the signal representing a discrete data signal point. A signal representing the superimposed data signal point is modulated (23) and transmitted through the analog transmission line. In a receiver, the data signal point is decided (45) from the signal representing the superimposed data signal point, and the superimposed base band signal is extracted (49) by subtracting the decided result from the signal representing the superimposed data signal point. The base band signal is transformed (53) to the analog passband signal. A portion of information carried by the analog passband signal may be converted to a digital signal, and the digital signal is multiplexed (254) with the data signal. Further, a portion of information of each of a plurality of analog passband signals may be converted (310) to a digital signal, and the digital signal is multiplexed (254) with each other, and the other portion of the information is transformed (50-1, 50-2) to a base band signal, and the base band signal is superimposed (22) on a signal representing a data signal point generated from a signal generated by the multiplexing. <IMAGE></p> |
