【摘要】 提出了一种采用双正交复序列的高效扩频调制与解调方法(DoCS)。输入数据比特流被分割为长度为M的组,每组的M比特作为输入码字,从2M-2个长度为L的DoCS序列中选择一条序列进行发送,被选中的序列以QPSK方式调制在载波上,实现扩频通信。文中还提出了一种前向相位校正(FPC)方法来解决该系统中收发两端的载波同步问题。更多还原

【Abstract】 This paper presents a kind of high efficiency spreading spectrum modulation scheme using double orthogonal complex sequences(DoCS).In this scheme,input data bit-stream is split into many groups with length M.Each group is then mapped into a word of width M and then utilized to select one sequence from 2M-2 DoCS sequences each with length L.After that,the selected sequence is modulated on carrier in QPSK(quadrature phase shift keying) mode.In addition,a novel method named forward phase correction(FPC) is put forward for carrier recovery.更多还原