CAJ | 학술논문

长期演进(LTE)协议中规定的主同步信号和辅同步信号分别用来完成子帧同步和帧同步.基于频分双工长期演进( FDD-LTE)无线帧中主同步信号和辅同步信号的信道频响基本相等的假设,提出了一种帧同步方法.采用蒙特卡罗方法对该同步方法在不同信道模型下的帧同步成功概率进行了仿真.仿真结果表明:当采用线性最小均方差信道估计时,该方法的性能在存在载波频偏和快速傅立叶变换(FFT)窗定时偏差的实际应用环境中仍然很好,并且在低信噪比条件下保持鲁棒.通过在不同多普勒频移条件下进行仿真和分析,发现当信噪比大于0 dB时,即使在高多普勒频移环境下,该方法的帧同步成功概率仍超过99％,这意味着此帧同步方法能适用于大多数移动通信环境.通过与利用辅同步信号的正交性,采用在频域把接收到的辅同步信号和本地序列进行相关操作完成帧同步的方法对比,该方法在存在载波频偏、FFT窗定时偏差和多普勒频移的移动应用环境中的帧同步成功概率具有明显优势.
장기연진(LTE)협의중규정적주동보신호화보동보신호분별용래완성자정동보화정동보.기우빈분쌍공장기연진( FDD-LTE)무선정중주동보신호화보동보신호적신도빈향기본상등적가설,제출료일충정동보방법.채용몽특잡라방법대해동보방법재불동신도모형하적정동보성공개솔진행료방진.방진결과표명:당채용선성최소균방차신도고계시,해방법적성능재존재재파빈편화쾌속부립협변환(FFT)창정시편차적실제응용배경중잉연흔호,병차재저신조비조건하보지로봉.통과재불동다보륵빈이조건하진행방진화분석,발현당신조비대우0 dB시,즉사재고다보륵빈이배경하,해방법적정동보성공개솔잉초과99％,저의미착차정동보방법능괄용우대다수이동통신배경.통과여이용보동보신호적정교성,채용재빈역파접수도적보동보신호화본지서렬진행상관조작완성정동보적방법대비,해방법재존재재파빈편、FFT창정시편차화다보륵빈이적이동응용배경중적정동보성공개솔구유명현우세.
The primary synchronization signal and the secondary synchronization signal are respectively used to fulfill the subframe and frame synchronization in the long term evolution (LTE) systems.Based on the assumption that the channel frequency response of the primary synchronization signal symbol is nearly the same as that of the secondary synchronization symbol in frequency division duplex-LTE (FDD-LTE),a new synchronization method is proposed.The frame synchronization success probability is simulated in different wireless channel models and the Mento-Carlo method is used in the simulation.Simulation results show that if the LMMSE channel estimation is adopted,the proposed method is robust at a low signal noise ratio (SNR) scenario and works well when carrier frequency offset and fast Fourier transform (FFT) window timing offset are considered in practical applications. The frame synchronization success probability can still exceed 99％ with an SNR of 0 dB when the maximum Doppler shift is very large,which means that this robust frame synchronization method can be applicable in most mobile situations.Simulation results also show that the success probability of the proposed frame synchronization method is higher than that of the method which fulfills the frame synchronization through correlating the received secondary synchronization symbol with local sequences in practical applications.