Its principles , schemes and performance are illustrated in this thesis . the thesis also analyses the performance of ofdm systems affected by synchronization error 本文简要介绍了ofdm的基本原理、系统结构和性能,分析了ofdm系统性能受同步误差的影响。
Because the synchronization error is independent of information signal , the power and frequency of information signal can be equivalent to that of chaotic signal 由于同步误差与信息信号无关,从而在增大信息信号功率的同时允许其频率与混沌信号的频率相当。
When a synchronization error exists , the orthogonality between sub - carriers ca n ' t be maintained , serious inter - carrier interference is introduced and demodulation performance will be degraded greatly 当存在同步错误时,子载波之间的正交性遭到破坏,从而引起严重的载波间干扰,使解调性能大大下降。
Triggering time synchronization error model is derived , and based on phase noise model of frequency source , random synchronization error is considered . the effect of fixed and linear error on focusing quality is given by simulation 仿真试验给出了固定、线性、正弦及随机型触发时间同步误差对点目标成像指标的影响,同时给出了相应的面目标仿真结果。
The effect of local oscillator syntonization error and triggering time synchronization error on bistatic sar imagery are analyzed based on their error models . useful simulation results are provided for system design 本文重点研究了双基地sar本振相位同步误差与触发时间同步误差对成像的影响,建立了误差模型,给出了仿真试验结果,为系统设计提供了参考依据。