我們希望使用方塊型指標方法解決相位雜訊所造成的子載波間干擾效應(ICI)。因相位雜訊為隨機改變的，故有些文獻提出的方法要降低編碼率(code rate=1/2)來獲得減少相位雜訊的方法；或是有些文獻提出先去簡易地估測共同相位錯誤，然後補償共同相位錯誤，而沒有去補償其他子載波間干擾效應(ICI)。論文中所提出的方法，雖然編碼率也會降低，損失了一些正交分頻多工系統的頻寬效益，卻可以解決相位雜訊的困擾。且不需要降低編碼率小於1/2，我們提出來的方法會有疊代的動作，因此複雜度會提升。好處是讓系統的錯誤率降低。

We hope that using block pilots can estimate inter-carrier interference caused by phase noise. The effect of phase noise is random process. We need to lower code rate to decrease the effect of phase noise .The theory in one reference will loss bandwidth efficiency in OFDM system by changing the code rate into half to solve the phase noise effect. The theory in the other reference compensates common phase error term (CPE) only and do not care about inter-carrier interference term (ICI term). Our proposed theory can estimate common phase error term and ICI term by using block pilots. Although code rate may be lower the number of interaction may be increased. We will have better performance in OFDM system by solving the problem in inter-carrier interference caused by phase noise.

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