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所謂正交,是針對波型而言的. 如果兩個波形在一段時間(一般為一個週期)內積分為零,他們就在這段時間內正交. N個兩兩正交的波形,可以構成一個N維的訊號空間.常見的M-PSK,M-QAM,都是二維帶通信號;基本訊號都是cos(2pifct)和sin(2pifct).訊號空間中的每個點,代表一個N維的向量資訊,資訊被調製到訊號空間中的特定點上.
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