SYMBOL RATE AND MODULATION LEVEL CONTROLLED ADAPTIVE MODULATION SYSTEM WITH TDMA TDD FOR HIGH BIT-RATE TRANSMISSION IN HIGH DELAY SPREAD ENVIRONMENTS/

The authors propose a symbol rate and modulation level controlled adap tive modulation system with TDMA/TDD, which controls both the symbol r ate and nodulation level according to the channel conditions to achiev e wide dynamic range for the modulation parameter control, as well as to improve delay spread immunity. Moreover, the proposed system applie s a symbol rate control suitable for adaptive modulation. Computer sim ulation confirms that the proposed system is very effective for improv ing the delay spread immunity in high delay spread environments.