The theoretical analysis shows that the chaotic sequences serve as spreading codes for A-CDMA.
理论分析表明，该混沌序列具有较理想的A -CD MA扩频码性能。
In spreading code design, MAI and ISI are removed by constructing spreading codes with zero correlation window, which increases system capacity.
在扩频码设计中，通过构造零相关窗码可以消除MAI和ISI，从而提高系统容量。
However, the code resource is very limited for ZCW spreading codes and the complexity of joint detection is huge when the number of code channels takes large.
但二者都有一定局限性，对于零相关窗码来说，它的码字资源十分有限，对于联合检测来说，当用户数很大，它的复杂度不能容忍。
Blind multiuser detection technology can detect the exptected user with only needing the spreading codes and without train sequences and without information of users.
然而频繁的发送训练序列严重制约了多用户检测技术的实时性和实用性；
One feature that provides flexibility of the so-called physical layer of the WCDMA air interface is the use of Orthogonal Variable Spreading Factor (OVSF) codes.
一个功能，它提供了灵活性在所谓的WCD MA空中接口物理层是使用正交可变扩频因子(OVS f码)码。
Note: All codes within one timeslot allocated to the same CCTRCH use the same transmission power in case they have the same Spreading Factor.
注：在一个时隙内被同一CCTRCH分配的所有码，如果具有同样的扩频因子，则使用同样的发射功率。
Base_station USES finite number of space_time codes to spread, and small number of antennas to transmit and receive signal, thus TD_SCDMA mobile terminals can obtain maximal spreading gain.
用有限的空时码进行扩谱，并利用较少的发射天线和接收天线进行信号的发射与接收，从而在TD _ SCDMA移动接收端获得最大的扩谱增益。
The modeling and analysis of orthogonal variable spreading factor (OVSF) codes assignment in wideband code division multiple access (WCDMA) cellular communication systems are presented.
对宽带码分多址(WCDMA)蜂窝移动通信系统中下行链路的正交可变扩频因子(OVSF)码字分配问题进行了建模分析。
The modeling and analysis of orthogonal variable spreading factor (OVSF) codes assignment in wideband code division multiple access (WCDMA) cellular communication systems are presented.
对宽带码分多址(WCDMA)蜂窝移动通信系统中下行链路的正交可变扩频因子(OVSF)码字分配问题进行了建模分析。
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