CAJ | 학술논문

针对正交频分复用(OFDM,Orthogonal Frequency Division Multiplex)无线传输系统,提出并设计了一种适用于802.11a 标准前导序列的同步算法.首先基于接收基带数据能量判断信道空闲状态,再计算数据归一化自相关值检测帧起始位置,最后利用基带数据与参考训练序列的互相关运算检测OFDM符号的起始位置,实现同步功能.算法的硬件实现采用移位加和流水线技术来提高系统的性能与效率.实践表明,所提算法能有效地实现同步并且硬件实现复杂度低,适合于超大规模集成电路(VLSI,Very Large Scale Integration)的实现.
침대정교빈분복용(OFDM,Orthogonal Frequency Division Multiplex)무선전수계통,제출병설계료일충괄용우802.11a 표준전도서렬적동보산법.수선기우접수기대수거능량판단신도공한상태,재계산수거귀일화자상관치검측정기시위치,최후이용기대수거여삼고훈련서렬적호상관운산검측OFDM부호적기시위치,실현동보공능.산법적경건실현채용이위가화류수선기술래제고계통적성능여효솔.실천표명,소제산법능유효지실현동보병차경건실현복잡도저,괄합우초대규모집성전로(VLSI,Very Large Scale Integration)적실현.
@@@@Aiming at OFDM (orthogonal frequency division multiplex) wireless communication systems, a synchronization algorithm based on 802.11a preamble structure is proposed. The algorithm, based on calculation of the input baseband data energy, first determines the busy state of the channel, then by using the autocorrelation analysis, detects the start point of a frame, and finally by computing the cross-correlation between the input data and the reference training sequence locates the start point of the OFDM symbols and realizes the synchronization. For hardware implementation of the proposed algorithm, the shift-and-add operations and the pipeline technology are adopted, thus to enhance the performance and efficiency of the system. Experiment indicates that the proposed algorithm could provid efficient frame detection and OFDM symbol detection with low complexity of hardware architecture, and thus is proper for VLSI (Very Large Scale Integration) implementation.