基于C-RAN与LTE-Hi的BR-OFDMA导频图案设计

在集中式/协作式/云计算无线接入网（C-RAN）环境下，结合热点及室内覆盖的长期演进(LTE-Hi)特点，研究导频图案的设计。LTE-Hi要求插入的导频数量比传统的长期演进(LTE)少，又由于其覆盖特点导致小区边界更容易受相邻小区干扰，由此提出一种应用块重复的正交频分多址（BR-OFDMA）和压缩感知信道估计技术的导频图案设计方案。该方案能够探测各相邻小区间的干扰情况，然后根据干扰情况设置BR-OFDMA参数，最后得到导频图案。该方案能明显减少导频数量，在C-RAN的云结构下更适合LTE-Hi相邻小区间的协作配置，能根据干扰情况，在资源消耗与性能之间进行平衡。仿真表明该方案在低信干比环境下仍能表现较好性能，适合在C-RAN与LTE-Hi中应用。

Design of BR-OFDMA pilot pattern based on C-RAN and LTE-Hi

In the cloud radio access network(C-RAN) environment,according to hotspot and the characteristic of Long Term Evolution Hotspot/indoor(LTE-Hi),design of pilot pattern is presented.LTE-Hi requires less number of pilots than traditional Long Term Evolution(LTE). Meanwhile,cell boundary is more vulnerable to be interfered by neighboring cell. Therefore,a pilot pattern design scheme is proposed which applies block repeat orthogonal frequency division multiple access(BR-OFDMA) and compressive sensing channel estimation techniques. This scheme can detect interference between neighboring cells and then set up parameters of BR-OFDMA according to the interference to obtain pilot design finally.It can significantly reduce the number of pilots and it is more suitable for collaborative configuration of LTE-Hi neighboring cell in the structure of C-RAN. It can also balance resource consumption and performance according to interference. The simulation shows that the scheme has better performance in low signal to interference ratio(SIR) environment. It is suitable for applying in the C-RAN and LTE-Hi.