직교주파수 분할다중화 시스템에서 초기 동기 이전의 자동 이득조절 방법 및 장치
이용수, 방영조, 김준우, 박윤옥
- 7746966 (2010.06.29)
- The present invention relates to a method for automatic gain control (AGC) before an initial synchronization of a mobile station modem in OFDM system, and an apparatus thereof. The AGC apparatus includes: an initial synchronization inspector that verifies whether an initial synchronization for an input block sample (k) signal has been performed; a frame divider that divides a frame into predetermined intervals B(k) for the input block sample(k) signal in the case that the initial synchronization has not been performed; a reference value inspector that compares a difference value Pref Pcalc, between a predetermined reference value Pref and sample data average energy Pcalc, with a predetermined value; a count controller that increases or decreases the count when the difference value Pref Pcalc compared by the reference value inspector is greater or less than the predetermined value; a count inspector that inspects whether the count is greater or less than 0 when the input block sample (k) reaches a maximum value MAX; and a gain controller which increases or decreases the gain, level by level, according to the count inspection result of the count inspector.
- KSP 제안 키워드
- Automatic Gain Control(AGC), Average Energy, Gain Control, Initial Synchronization, Mobile station(MS), OFDM systems, Reference value, Sample data, block sample, difference value