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An Enhanced AGC Structure and P-SCH Detection Method for Initial Cell Search in 3GPP LTE FDD/TDD Dual Mode Downlink Receiver  

Chung, Myung-Jin (성균관대학교 정보통신공학부 통신시스템 연구실)
Jang, Jun-Hee (성균관대학교 정보통신공학부 통신시스템 연구실)
Choi, Hyung-Jin (성균관대학교 정보통신공학부 통신시스템 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.3C, 2010 , pp. 302-313 More about this Journal
Abstract
In this paper, we propose an enhanced AGC (Automatic Gain Control) structure and P-SCH detection method for initial cell search in 3GPP (3rdGenerationPartnershipProject) LTE (Long Term Evolution) FDD(Frequency Division Duplex) / TDD (Time Division Duplex) dual mode system. Since TDD frame structure consists of uplink subframe and downlink subframe, conventional AGC structure causes P-SCH detection performance degradation by increase of AGC variation due to signal power difference between uplink and downlink subframe. Also, P-SCH detection performance is degraded by distortion of P-SCH correlation characteristic in frequency offset and multipath fading channel environments. Therefore, we propose an AGC structure which can minimize P-SCH detection performance degradation with stable operation in 3GPP LTE TDD mode as well as FDD mode. Also we propose a P-SCH detection method which can reduce distortion of correlation chareteristics in frequency offset and multipath fading environments and obtain good P-SCH detection performance. Simulation results show that the proposed AGC structure and P-SCH detection method have stable AGC operation and excellent P-SCH detection performance for 3GPP LTE TDD / FDD dual mode downlink receiver in various channel environments.
Keywords
3GPP LTE; OFDMA; AGC; P-SCH; Initial Cell Search;
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