CAJ | 학술논문

本文针对宽带正交频分复用(OFDM)系统,分析了多径时延扩展与循环前缀(cP)长度及导频数目的关系.随后利用导频的频域相关性估计得到信道时域功率时延谱(PDP),并根据PDP提出信道均方根(RMS)时延及最大多径时延门限值的估计算法.最终实现OFDM系统对信道多径参量的实时跟踪,有利于系统参数自适应调整.仿真结果表明,本文算法在低复杂度条件下可以有效获知当前传输信道模型多径时延参数的近似统计信息.
본문침대관대정교빈분복용(OFDM)계통,분석료다경시연확전여순배전철(cP)장도급도빈수목적관계.수후이용도빈적빈역상관성고계득도신도시역공솔시연보(PDP),병근거PDP제출신도균방근(RMS)시연급최대다경시연문한치적고계산법.최종실현OFDM계통대신도다경삼량적실시근종,유리우계통삼수자괄응조정.방진결과표명,본문산법재저복잡도조건하가이유효획지당전전수신도모형다경시연삼수적근사통계신식.
In this paper we have analyzed the relationship between delay spread and Cyclic Prefix(CP),the number of pilot in OFDM system.The proposed algorithms estimate the power delay profile(PDP),which utilize the frequency-domain correlation of pilot.According to the PDP,the two important dispersion parameters,namely root-mean-squared(RMS)delay spread and maximum excess delay of the channel,are estimated.At last we can real time track the channel parameters and adaptive adjust them in OFDM system.Simulation shows that we can obtain the approximately statistical information of channel model's delay parameters.