it is a sqrt module ,with test bench.

DS-CDMA实现基本过程： <TRANSMITTING END>待传信息--NRZ变换（变成NRZ码）---调制（乘以sqrt(2*eb)*cos(2*w*t)）----扩频（乘以m序列或其他伪随机码） ----信道中传输（有加性噪声）<DURING THE CHANNEL> ---解扩（乘以相同的m序列或其他伪随机码）---解调（乘以sqrt(2*eb)*cos(2*w*t)）----比特判别（sum(i)>0-->1 sum(i)<0-

monte carlo simulation. to run the above simulation input" [y1,y2,y3,y4]= ed(0,1,25,2) " in command window. the "g" in the code above represents the normalisation i.e it represents variance(signal)/variance (noise) as SNR= power(signal)/power(n