用vhal在qurtusII 7.2 实现的cpsk.dpsk.fsk.ask 四种方式可控制调制方式，用正弦波为载波，伪随机，作为测试信号-QurtusII 7.2 with vhal achieved in four ways cpsk.dpsk.fsk.ask modulation can be controlled with a sine wave for the carrier, pseudo-random, as a test signal