초록 ▼

In a variable modulation communication method, the transmission quality of a transmission path is monitored. If the transmission quality is good, communication is performed while the transmission time is shortened by using a multilevel modulation scheme. If the transmission quality is bad, communica

In a variable modulation communication method, the transmission quality of a transmission path is monitored. If the transmission quality is good, communication is performed while the transmission time is shortened by using a multilevel modulation scheme. If the transmission quality is bad, communication is performed while the transmission time is prolonged by using a modulation scheme having a smaller number of levels than the multilevel modulation scheme. A variable modulation communication apparatus is also disclosed.

대표청구항 ▼

A variable modulation communication apparatus comprising: first modulation means for performing multilevel modulation of digital data; second modulation means for performing modulation of digital data with fewer levels than said first modulation means; monitor means for monitoring transmission quali

A variable modulation communication apparatus comprising: first modulation means for performing multilevel modulation of digital data; second modulation means for performing modulation of digital data with fewer levels than said first modulation means; monitor means for monitoring transmission quality of a transmission path in order to determine a modulation scheme, said modulation scheme being carried out by one of said first and said second modulation means; TDMA control means for performing time slot allocation differently depending on whether said first or second modulation means is used to carry out said modulation scheme, and performing time-division multiplexing communication control by using predetermined time slots which are allocated more in number when said second modulation means is used to carry out said modulation scheme than when said first modulation means is used to carry out said modulation scheme, thereby obtaining an identical information communication rate regardless of whether said first or said second modulation means is used; switch means for selectively switching time-division output data from said TDMA control means to output the data to said first and said second modulation means; and control means for controlling said switch means and said TDMA control means on the basis of said modulation scheme determined by said transmission quality monitored by said monitor means to selectively enable said first or said second modulation means.