Abstract: In order to mitigate the effect of fading，a switched diversity scheme with the least implement complexity is proposed for bluetooth.With no change to the traditional air interface protocol，the proposed scheme requires only one extra antenna and one extra switch to obtain diversity gain.The system statistic properties are analyzed based on statistics theory.The optimal switch threshold under the criteria of minimizing bit error probability is given based on the numerical method.Simple in structure and good in compatibility，the switched diversity can improve the performance of bluetooth efficiently.

摘要： 提出了一种硬件最简的切换分集（Switched Diversity）方案。该方案不用改变蓝牙空中接口协议，仅添加一个切换开关和一个天线即可实现分集处理。使用随机信号理论对系统统计特性进行了分析，利用数值计算方法求解了基于蓝牙比特错误率最小准则下的最佳切换门限。该方案实现简单，兼容性好，能有效改善蓝牙在衰落信道下的系统性能。