| 摘要 |
PURPOSE: To similarly or remarkably improve error probability by duplexing the rate of a transmission stuffing instruction. CONSTITUTION: When this method is applied to a 64 QAM modulation scheme, a specified signal point is selected by three Q bits corresponding to the amplitude of a Q signal component and three I bits I1, I2 and I3 corresponding to an I signal component. In this case, two least significant I bits I2 and I3 are used for communicating the stuffing instruction and the most significant I bits I3 and three Q bits of the same symbol are used for the other purposes. In a transmitter, the stuffing instruction is expressed by bits I2=0 and I3=0, and a non-stuffing instruction is expressed by bits I2=1 and I3=0. This instruction corresponds to the I signal amplitudes of±7volt and±1volt, and an optimum S/N for communicating the stuffing instruction is achieved. At a receiver, the stuffing instruction is determined from the bit I2=0 and the non-stuffing instruction is determined from the bit I2=1.
|
