摘要
针对正交频分复用系统中非理想前端因素同时存在的情况,提出一种在I/Q失配存在的条件下载波频偏的估计算法。该算法利用三个连续的前导符在频域推导出两种不同估计算法,根据噪声及I/Q失配程度将载波频偏划分为两区间分别选用不同算法进行估计。仿真结果表明,该算法在频率相关和频率无关I/Q失配条件下均能有效地准确估计载波频偏。
According to the situation that non-ideal factors of analog front-end in wideband Orthogonal Frequency Division Multiplexing(OFDM)system exit at the same time, this paper presents an estimation algorithm of Carrier Frequency Offset(CFO)with presence of I/Q mismatch(I/Q-M). The scheme utilizes 3 consecutive preambles and processes them at frequency domain to acquire 2 different estimation algorithms and the carrier frequency offset is divided into two scopes using different algorithms respectively on the basis of I/Q mismatch degree and noise. Simulation results show that the proposed scheme is able to estimate the offset accurately to both Frequency Independent(F-I)and Frequency Dependent(F-D)I/Q mismatch.
作者
周雪荣
薛香艳
叶凡
任俊彦
ZHOU Xuerong;XUE Xiangyan;YE Fan;REN Junyan(State-Key Lab of ASIC & System, Fudan University, Shanghai 201203, China;Micro-/Nano-Electronics Innovation Platform, Fudan University, Shanghai 201203, China)
出处
《计算机工程与应用》
CSCD
北大核心
2017年第4期118-122,共5页
Computer Engineering and Applications
关键词
正交频分复用
宽带系统
载波频偏估计
I/Q失配
Orthogonal Frequency Division Multiplexing(OFDM)
wideband system
Carrier Frequency Offset(CFO)
I/Q mismatch
