CAJ | 학술논문

提出了一种基于自适应复系数内插的信道估计算法，改善了无线区域网络（WRAN）系统对抗动态多径时延的能力。WRAN 是第一个采用认知无线电技术改善频谱效率的宽带接入标准，系统在下行链路中采用了正交频分复用（OFDM）调制技术，而信道估计技术对于采用相干解调的 OFDM系统十分重要。传统的 OFDM信道频域响应（CFR）估计算法通常采用实系数频域内插的方式，在对抗 WRAN 系统长多径时延信道时，不能有效地工作。该文在研究实系数 FIR 内插变换域响应的基础上，提出了一种复系数内插算法。为了同时适用于短时延信道，提出了一种低复杂度、自适应匹配信道最大多径时延的算法。通过仿真，验证了该算法能够对抗更大的多径时延，提高信道估计的精度，改善系统误码性能。
제출료일충기우자괄응복계수내삽적신도고계산법，개선료무선구역망락（WRAN）계통대항동태다경시연적능력。WRAN 시제일개채용인지무선전기술개선빈보효솔적관대접입표준，계통재하행련로중채용료정교빈분복용（OFDM）조제기술，이신도고계기술대우채용상간해조적 OFDM계통십분중요。전통적 OFDM신도빈역향응（CFR）고계산법통상채용실계수빈역내삽적방식，재대항 WRAN 계통장다경시연신도시，불능유효지공작。해문재연구실계수 FIR 내삽변환역향응적기출상，제출료일충복계수내삽산법。위료동시괄용우단시연신도，제출료일충저복잡도、자괄응필배신도최대다경시연적산법。통과방진，험증료해산법능구대항경대적다경시연，제고신도고계적정도，개선계통오마성능。
A channel estimation algorithm based on adaptive complex coefficient interpolation is proposed for improving the ability to combat multipath delay of wireless regional area network (WRAN)system greatly.WRAN is the first broadband access standard to improve the spectrum efficiency by making use of cognitive radio technology.Orthogonal frequency divi-sion multiplexing (OFDM)is used in the downlink of the WRAN system in which channel estimation is very important for the coherent demodulation of OFDMsystem.However,traditional channel frequency response estimation algorithms,which adopt real-coefficient are sensitive to long-delay echoes in multipath channels.According to transform domain response of real coefficient finite impulse response (FIR)interpolation,a complex coefficient interpolation algorithm is derived in this paper.In order to apply to short delay channel simultaneously,a low-complexity algorithm adaptively matching channel maximum multipath delay is proposed.Then the estimation performance is investigated and simulated.Experimental results verified the theoretical analysis and the validity of the proposed scheme.