摘要
针对目前LTE小区搜索算法比较复杂的问题，根据信号的时频对称特性，提出了时域和变换域联合估计的简化方法。没有增加额外的测度函数，分三步实现LTE小区准确搜索，即时域实现半帧定时和分数倍频偏估计，频域获取整数倍频偏估计和半帧细定时，混合检测实现帧定时，同时根据同步码的检测获取小区ID。与以往算法相比，所提算法降低了LTE小区搜索的复杂度。仿真结果证明，信噪比在-10～2dB之间时该算法的性能有一定提高，对于实现终端快速准确的小区搜索有一定的应用价值。
To solve the problem of complexity for LTE cell search, a low complexity co - algorithm is proposed in both time and frequency domain, based on the symmetry properties of the signal. Instead of extra metric function, it is realized only by three steps to search the LTE cell accurately. In stepl the half frame is timed and the fractional frequency offset is estimated in time domain. In step2 the integer frequency offset and the fine - half frame timing is estimated in frequency domain. In step3 the frame is timed by the method of hybrid detection. Cell ID is also indentified by the synchronization code in the process. The algorithm can reduce the complexity of LTE cell search. The simulation results confirm that the performance of the algorithm is improved with the - 10dB 〈 SNR 〈 2dB. So the proposed algorithm is of some practical value for achieving cell search fast and accurately.
出处
《电讯技术》
北大核心
2010年第8期81-85,共5页
Telecommunication Engineering
关键词
宽带接入
LTE小区搜索
变换域
联合估计
混合检测
wideband access
LTE cell search
transform - domain
joint estimation
hybrid detection
