16QAM系统的调制,解调的仿真。作出星座图及调制，解调信号的波形，输出信号的功率谱，眼图及误码率曲线。-16QAM system, modulation, demodulation of the simulation. Make a constellation and the modulation, demodulation waveform, the output signal of the power spectrum, eye diagram and BER curves.

new Setting of a suitable threshold value.Then apply wavelet de-noising and compression on wavelet coefficients and thresohlding using global positive threshold value. So that a compressed image can be transmitted in an efficient manner.