【摘要】 提出了一种用于正交扩频码分配的码匹配机制,这种码匹配机制类似于已有的拥挤优先码分配机制.给用户分配码字时,码匹配机制只需比较待分配码的上层节点容量,不像拥挤优先机械机制中要比较所有上层节点的容量.因此码匹配机制在操作上比拥挤优先机制简单,相应的仿真时延平均减少了5%.仿真结果表明码匹配机制使得码阻塞概率减少了8%.也就是说,码匹配机制能够更为有效地使用WCDMA系统稀缺的无线带宽.更多还原

【Abstract】 OVSF(orthogonal variable spreading factor) codes in wideband code divison multiple access(WCDMA) systems have been used to provide variable data rates with different bandwidth requirements.The OVSF code placement has strong impact on the utilization and blocking probability of the codes.A code match strategy is proposed,which is carried out simply because of the code not being replaced in the operation.The simulation results show that the code blocking probability and access delay are improved by the proposed strategy.更多还原