摘要
非连续OFDM（NC-OFDM）是子载波非连续的OFDM，是认知无线电的主要数据传输方式。研究了基于重复PN序列的NC-OFDM时间同步算法，对Tufvesson时间同步目标函数进行了修正，使得目标函数只有一个峰值输出，极大地减少了虚警概率，同时还研究了频率偏移对目标函数的影响。仿真结果表明，此方法能够较好地应用于NC-OFDM系统。
Non-contiguous OFDM is a special OFDM which has non-contiguous subcarriers.It is the main manner of data transmission of cognitive radio. Timing synchronization algorithm of NC-OFDM based on PN repeated sequences is studied in this paper. A modification is made to Tufvesson＇s time synchronization object function so that the target function outputs only one peak value and the false alarm probability is significantly reduced. The frequency offset＇s influence on target function is also studied. Simulation result shows that this algorithm is suitable for NC-OFDM system.
出处
《通信对抗》
2009年第1期29-32,61,共5页
Communication Countermeasures
关键词
认知无线电
OFDM
非连续OFDM
时间同步
PN序列
虚警概率
cognitive radio
Orthogonal Frequency Division Multiplexing （OFDM）
non-contiguous OFDM
timing synchronization
PN sequence
false alarm probability
