IEEE 802.11p协议下基于交错导频的V2V信道估计

Staggered-layered pilot aided channel estimation scheme for IEEE 802.11p

车到车(vehicle to vehicle,V2V)通信因其复杂恶劣的信道环境,对系统的信道估计性能提出了更高的要求.针对IEEE 802.11p协议中导频过少无法准确跟踪频率选择性衰落信道的问题,提出了一种基于交错导频辅助的信道估计与跟踪方法.该方法将相邻符号的导频交错排布,利用相邻符号间信道的高度相关性,对前后时刻导频位置的信道估计结果进行插值运算,对V2V信道进行实时跟踪,在不改变IEEE 802.11p数据传输效率的前提下,其误码率性能在空旷高速的通信场景下明显优于基于原导频辅助的信道估计与跟踪方法.在所提出的交错导频框架下,针对不同V2V通信场景的特点选择合适的信道估计方案,可以较大程度地提高IEEE 802.11p的系统性能.

Vehicle to vehicle(V2 V)communication has a more rigorous requirement for channel estimation performance due to its complex and unfavorable channel environment.In this paper,in view of the fact that the pilots in IEEE 802.11 p are too poor to accurately track the frequency selective fading channel,a novel channel estimation and tracking scheme based on staggered-layered pilot has been proposed.On the premise of not changing the data transmission efficiency of IEEE 802.11 p,this scheme tracks the V2 V channel based on the frequency domain interpolation of the estimated channel obtained from the pilots of adjacent symbols according to the high correlation between the channel of adjacent symbols,which outperforms the channel estimation and the tracking scheme based on original pilot in open and high-speed communication scenarios.In the framework of the proposed staggered-layered pilot scheme,selecting the appropriate channel estimation scheme according to the characteristics of different V2 V communication scenarios can greatly improve the performance of IEEE 802.11 p.