The relation between periodic quasi - perfect sequences and cyclic hadamard difference sets of type is studied , the enumerating formula for periodic quasi - perfect sequences is given , the multiplier groups of some cyclic hadamard difference sets of type are determined , and the numbers of some periodic quasi ? ? perfect sequences corresponding to cyclic hadamard difference sets of type are obtained 揭示了周期拟完美序列与循环hadamard型差集的深刻对应关系，进而建立了周期拟完美序列的计数公式并且通过决定循环hadamard型差集的乘子群，分别求出了各族循环hadamard型差集对应的本质不同的拟完美序列的个数。
The relation between periodic quasi - perfect sequences and cyclic hadamard difference sets of type is studied , the enumerating formula for periodic quasi - perfect sequences is given , the multiplier groups of some cyclic hadamard difference sets of type are determined , and the numbers of some periodic quasiperfect sequences corresponding to cyclic hadamard difference sets of type are obtained 揭示了周期拟完美序列与循环hadamard型差集的深刻对应关系，进而建立了周期拟完美序列的计数公式并且通过决定循环hadamard型差集的乘子群，分别求出了各族循环hadamard型差集对应的本质不同的拟完美序列的个数。
Simulation indicates that the par of mc - cdma can be upper bounded 6db by using golay complementary sequences and s - r sequences as spreading sequences , which is much superior to m sequences and hadamard sequences . on the other side of view , compared with the old basic selected mapping method , this thesis proposes some other selected mapping algorithms and compares the performances based analysis and simulation 仿真表明，采用格雷互补序列作为扩频码来降低峰平比，不论是效果还是实用性，都大大优于m序列和hadamard序列；另一方面，本文在基本选择映射算法基础上，提出了几种改进的选择映射算法。
In the first part of this paper , resorting to the idea of hadamard principle value and induction , we discuss the inductive definition , existence of hadamard principle value , recursive formula , computation formula , differential formula on the sense of hadamard principle value for several kinds of quasi - bochner - martinelli - type high order singular integrals with one singular point 本文借助于高阶奇异积分的hadamard主值的思想以及归纳法的思想，在第一部分讨论了几类含一个奇点的拟bochner - martinelli型高阶奇异积分的归纳定义， hadmard主值的存在性，递推公式，计算公式，以及在hadamard主值意义下的微分公式。
