巴特沃斯數字低通濾波器。採樣率8000HZ，fp=2100hz,fs=2500hz,Rp=3db,Rs=25db.-butterworth LPF

BFSK 相关解调，与非相关解调不同！性能要好3dB-BFSK demodulator related, non-related demodulation different!

有关阵列天线的matlab仿真， 1、给出阵元的个数，阵元的间隔以及波长 2、计算方向图并绘制不同的方向图，有规律的排列 3、计算出主瓣宽度，3dB带宽，主瓣与第一旁瓣的幅度比（以dB作单位）-Array antenna matlab simulation, 1, to the number troupe, interval, and the wavelength of the array element 2, calculate the pattern and draw a

Bit Loading The amount of bits that can be carried per channel depends upon the SNR at that particular frequency, lower SNR levels may need more power to transmit data and since each frequency is subject to an overall power limit, those frequencies