(1) 产生数值为±1的用户随机数据；给出Matlab下对应的模块；

(2) 产生并给出64×64的Walsh矩阵，作为用户接入的扩频码；

(3) 利用上述一个用户的扩频码和用户数据演示扩频过程；给出Simulink工作框图；

(4) 利用FFT，计算并画出基带数据和扩频信号的频谱（在一个图中给出）；

-(1) value of ± 1 generated random data users　given under the corresponding Matlab module　(2) generation and gives the Walsh 64 × 64 matrix, as the user access to the spreading code　(3) the use of the a user' s spreading code and spread spectrum user data presentation process　given work Simulink block diagram　(4) the use of FFT, calculate and draw the base-band spectrum data and the spread spectrum signal (given in a diagram)