摘要
作为第三代移动通信IMT-2000中三大主流技术之一的WCDMA,采用长度可变的正交码序列OVSF作为信道化扩频序列,可支持多种速率请求。OVSF码的可变长特性可以满足通信中的多速率业务要求,而其正交性质则可以减小信道间的相互干扰。对OVSF码进行了研究,通过理论及MATLAB仿真验证了其正交性,分阶段对单码分配、动态码分配及满足不同QoS业务要求的动态码分配进行了介绍,并分别针对系统吞吐量和码阻塞率对各单码分配算法进行了仿真比较,验证了各种算法之间的性能优劣。
As one of the three mainstream technologies in the 3rd generation mobile communication IMT-2000, WCDMA uses OVSF as its channelization codes, which can support a variety of rate requests. The variable length feature of OVSF codes can meet the multirate traffic requirements in communication, and its orthogonal nature can reduce the mutual interference between channels. This paper studies OVSF codes and verifies the orthogonality of OVSF codes in theory through MATLAB simulation. It introduces the single-code assignment, dynamic code assignment and the dynamic code assignment fulfilling different QoS requirements by stage. It also compares the system throughput and code blocking probability of each single-code assignment algorithm by simulation to verify the performance of various algorithms.
出处
《计算机系统应用》
2010年第6期66-69,共4页
Computer Systems & Applications
基金
辽宁省教育基金(2008D028)
