基于Alamouti编码的移动台无线定位方法

Wireless Location Method for Mobile Station Based on Alamouti Coding

基于移动台位置的服务已经广泛融入人们的生活。目前基站定位主要作为GPS定位的补充,然而在低信噪比环境下,基站定位方法受信道影响具有较大定位误差。为了充分利用LTE系统中基站发送端多天线特点,提升定位精度,文中提出了一种基于Alamouti空时编码技术的OFDM-MIMO系统的移动台定位方案。首先给出了通用的无线定位系统模型及定位算法,其次研究了Alamouti编码译码过程及其对无线定位系统性能的影响,最后通过仿真,与传统OFDM系统定位方案进行性能对比。结果表明,较传统定位方案,基于Alamouti编码的移动台无线定位方法可以在低信噪比环境下显著降低定位参考信号误码率,提升定位系统性能。

The service based on mobile station location has been widely integrated into people＇ s lives. At present,the base station location is mainly used as a supplement to the GPS position,but in the low SNR environment,the base station location method has a large positioning error. In order to make full use of the multi antenna characteristics of base station in LTE system and improve the positioning accuracy ,a mobile station positioning scheme with Alamouti space time encoding technology on OFDM-MIMO system is proposed in this paper. It first gives a general model of wireless positioning system and positioning algorithm,followed by the study of the Alamouti decoding process and its impact on the wireless positioning system performance, finally through simulation, this scheme is compared with the traditional OFDM system positioning scheme on performance. The results show that compared with the traditional positioning scheme, the mobile station based on Alamouti encoding can significantly reduce the bit error rate and improve the performance of the positioning system in low SNR environment.