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학술대회
The Performance of Frequency Offset Estimation in DVB-C2 Receiver
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- 발행일
- 201301
- 출처
- International Conference on Advanced Communication Technology (ICACT) 2013, pp.1106-1110
- 협약과제
- 12PR2200, 차세대 디지털 케이블 전송기술 개발, 최동준
- 초록
- In this paper, we show the performance of frequency offset (FO) estimation in Digital Video Broadcasting for Cable version 2 (DVB-C2) receiver which uses orthogonal frequency-division multiplexing (OFDM). In OFDM system, inter-carrier interference (ICI) occurs due to FO which is caused by an oscillator of a transmitter and receiver, and degrades the performance of a receiver. Thus, FO should be estimated and compensated to improve the performance of a receiver. FO can be normalized to subcarrier spacing in OFDM system, and consists of fractional frequency offset (FFO) and integer frequency offset (IFO) accordingly. FFO is estimated in time domain using cyclic prefix (CP), and IFO is estimated in frequency domain with unique synchronization sequence (USS) of preamble due to the structure of DVB-C2 frame. Because the estimation of FO is influenced by CP length and echo channels shown in the DVB-C2 specification, we simulate the mean square error (MSE) of FO estimation w.r.t CP length and echo channels. The results of simulation show that MSE is reduced as CP length is longer. In addition, MSE is improved as Eb/N0 increases. However, MSE of the estimated FO tends to saturate at high Eb/N 0 when echo channels are used. In addition, it increases when the maximum delay spread between echo channels is longer. © 2013 GIRI.
- KSP 제안 키워드
- Cyclic prefix(CP), DVB-C2, Delay spread, Digital video broadcasting, Frequency Offset Estimation, Integer Frequency Offset, Inter-carrier interference, OFDM systems, Subcarrier spacing, Transmitter and receiver, fractional frequency offset