基于C-RAN与LTE-Hi的BR-OFDMA导频图案设计  

Design of BR-OFDMA Pilot Pattern Based on C-RAN and LTE-Hi

作　　者：余翔[1] 徐宇明[1] 吕世起 曾银强 

机构地区：[1]重庆邮电大学,重庆400065

出　　处：《电讯技术》2015年第3期279-285,共7页Telecommunication Engineering

基　　金：国家科技重大专项(2014ZX03003004-003)~~

摘　　要：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。In the cloud radio access network（C-RAN） environment,according to hotspot and the charac- teristic of Long Term Evolution Hotspot/indoor（ LTE-Hi）, design of pilot pattern is presented. LTE-Hi re- quires 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 in- terference. 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.

关 键 词：云无线接入网 块重复正交频分多址 导频图案设计 压缩感知 信道估计 

分 类 号：TN929.5[电子电信—通信与信息系统]