The Construction of GOS Spreading Code Sets and Their Applications into Multi-Rate Multe-Cell QS-CDMA Systems
The Construction of GOS Spreading Code Sets and Their Applications into Multi-Rate Multe-Cell QS-CDMA Systems
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GOS扩频码集的构建及其在多速率多小区QS-CDMA系统中的应用
DOI：
10.1007/s11277-012-0831-z
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发表时间：
2012-09
影响因子：
2.2
通讯作者：
Li, Daoben
中科院分区：
文献类型：
--
作者：
Feng, Lifang;Fan, Pingzhi;Tang, Xiaohu;Li, Daoben
本文提出了一类广义正交序列(GOS)，它具有如下特征：(1)来自不同GOS集的两个任意序列在零位移(不包括零位移)附近的互相关为零；(2)来自同一GOS集不同子集的两个任意序列在零位移附近的互相关为零；(3)来自同一GOS集的同一子集的两个任意不同的序列是正交的。通过将GOS集应用于多速率多小区准同步码分多址(QS-CDMA)系统，对系统干扰进行了分析，并与熟知的级联正交/伪随机序列集进行了比较。结果表明，由于在零点附近的零相关特性，采用GOS集的系统的干扰比级联的正交/伪随机序列集有更大的降低，从而在相同条件下比采用级联的正交码/伪随机序列集具有更好的误码率性能。
In this paper, a class of generalized orthogonal sequences (GOS) is presented with the the following characteristics, (1) the cross-correlations in the vicinity of zero shift (zero shift is excluded) between two arbitrary sequences from different GOS sets are zeros; (2) the cross-correlations in the vicinity of zero shift between two arbitrary sequences from different subsets of the same GOS set are zeros; and (3) two arbitrary different sequences from the same subset of the same GOS set are orthogonal. By applying the GOS sets to multi-rate multi-cell quasi-synchronous CDMA (QS-CDMA) system, the system interference is analyzed and compared with that of well-known concatenated orthogonal/PN sequence sets. It is shown that due to the zero correlation properties in the vicinity of zero shift, the interference of system employing GOS sets can achieve a bigger reduction than concatenated orthogonal/PN sequence sets, thus resulting better BER performance than that of latter under the same conditions.