当发生盗版时，数据发行商不但可以追踪到叛逆者，而且可以通过更新用户的码向量来废除叛逆者的秘密钥的解密能力。
When the piracy occurring, the data supplier not only can trace the traitor but also can revoke the decryption ability of the traitor's private key by updating the code vectors of the users.
新算法使用时变遗忘因子对误差进行指数加权平均来估计均方误差，并使用该因子改变自适应迭代过程中滤波器系数向量的更新方向。
In the new algorithm, a time-variant forgetting factor is introduced to estimate the Mean Square Er-ror (MSE) and change the updating direction of adaptive filter coefficient vector.
利用导频符号进行权向量更新算法，并作为空间波束成型器的参考信号。
The pilot symbols were used to estimate channel and acted as reference signal of beam-former.
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