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运用OFDM中的频率正交的概念将CDMA码进行分组,从而大大降低信道均衡的计算复杂度。所建议的正交频率分组(OFDG)码是将长度为M的码集分成N组,任意两组码在频域上相互正交。同一个组内的码在时域上相互正交。文章介绍了这种码的设计准则,并给出了一个具体的实例,称为梳状频谱(CS)码。CS码利用传统的正交码通过2步操作得到:(1)循环重复操作;(2 )角度旋转操作。与传统的CP- CDMA相比,CP- CS -CDMA用于信道均衡的点数减少了N倍。仿真结果验证了这一方法的有效性。
The concept of frequency orthogonalization in OFDM is used to group CDMA codes, thereby greatly reducing the computational complexity of channel equalization. The proposed orthogonal frequency grouping (OFDG) code divides a code set of length M into N groups, and any two groups of codes are orthogonal to each other in the frequency domain. The codes in the same group are orthogonal to each other in the time domain. The article introduces the design criteria for this code and gives a concrete example, called comb spectrum (CS) code. The CS code is obtained by 2-step operation using the traditional orthogonal code: (1) loop repeat operation; (2) angle rotation operation. Compared with the traditional CP-CDMA, CP-CS-CDMA for channel equalization points to reduce N times. Simulation results verify the effectiveness of this method.