Abstract--This paper introduces an approach to generate generalized pairwise complementary (GPC) codes, which offer a uniform interference free windows (IFWs) across the entire code set. The GPC codes work in pairs and can fit extremely power efficient quadrature carrier modems. The characteristic features of the GPC codes include: the set size is 2 , the processing gain is 4 , and the IFW's width is 8 identically for all codes in a set, where is the times to perform Walsh