| 摘要 |
A method of and apparatus for transmitting data at a high data rate in a plurality of low data rate channels is described. The set of lower rate channels are phase rotated before being summed and transmitted. The amount of phase rotation is dependent on the number of channels used to form the higher rate channel. In an embodiment where two lower rate channels (CHANNEL A, CHANNEL B) (90, 92) are used, the in-phase and quadrature-phase components (94, 96) of the two channels are complex multiplied before upconversion with an in-phase and quadrature-phase sinusoids (COS( omega Ct), SIN( omega Ct)), For a high rate channel comprised of more than two lower rate channels (90, 92), the in-phase and quadrature-phase component of each channel is upconverted with a set of sinusoids (COS( omega Ct + i/N.180 DEG ), SIN( omega Ct + i/N.180 DEG )) that are phase offset from one another. |
