时分双工CDMA收发讯机的同步方法

Practical Synchro Methods for a CDMA Transceiver

:随着通信技术和计算机技术以及它们结合应用的迅速发展 ,人们对数据及多媒体通信的要求越来越高 ,希望在任何时候 ,任何地点都可以实现快速、可靠和高质量的通信 ,新兴的扩频无线通信技术使这种愿望得以实现 ,因而成为当今无线通信领域的研究热点之一。一种适用于点对点数据及多媒体通信的时分双工 CDMA收发讯机的整机构成 ,它以基带处理芯片 HSP382 4为核心 ,对在时分双工的条件下 ,该收发讯机帧同步和用户码速同步的解决方案进行了讨论 ;对帧同步 ,提出了从机数据包长不变法和从机数据包长可变法 ;对用户码速同步 ,提出了锁相环跟踪同步法。

With the rapid development of communication technology,computer technology and their integrated applications,the demand of data and multimedia communication is becoming more and more exigent.People need rapid,reliable and high quality communication at any time and in any place.The advanced wireless spread specteum technology makes the desire into reality and becomes the hottest research topic in the wireless communication field.A CDMA transceiver which is applicable to point to point data and multimedia communication is presented in this paper.The core of the transceiver is the baseband processor HSP3834.The synchro techniques of the transceiver under the time devision and duplex condition are emphasized.For frame synchronization,we propose fixed frame length method and variable frame length method.For user data rate synchronization,we propose PLL (Phase Locked Loop) method.In final,some experimental results and performance parameters are given.