| 摘要 |
<p>A high speed modem system which utilizes multiple carriers to successively transmit frames containing data such that the frames are transmitted so that the level of the signal is minimized, and is preferably zero, at the borders between individual frames thus, reducing or eliminating interframe discontinuities and the accompanying distortion and interframe interference. The components of the inphase signal and the quadrature signal are grouped to form an I odd/Q even group (208) and an I even/Q odd group (210). In order to restore the missing components in the I odd/Q even group, the I odd and the Q even components are duplicated and combined with the I odd/Q even group. In order to restore the missing components in the I even/Q odd group, the I event component is negated and used to form the next higher numbered I component and the Q odd component is negated and used to form the next higher numbered Q component. The resulting waveforms are subjected to an Inverse Discrete Fourier Transform function. The resulting imaginary waveform (216) is staggered by one-half frame and then added to the real waveform (214).</p> |
