Performance Analysis of Symbol Timing and Carrier Synchronization in Block Burst Demodulation of LMDS Uplink

LMDS 역방향 채널의 블록 버스트 복조에 대한 심벌타이밍과 반송파 동기의 성능 분석

  • Cho, Byung-Lok ;
  • Lim, Hyung-Rea ;
  • park, Sol
  • 조병록 ;
  • 임형래 ;
  • 박솔
  • Published : 1999.02.01

Abstract

In this paper, we propose $\pi$/4 QPSK scheme with block modulation algorithm, which can reduce preamble in order to transmit ATM cell efficiently in the uplink channel of LMDS, and also designed a new carrier recovery circuit which can improve carrier synchronization performance of block demodulation algorithm. The $\pi$/4 QPSK scheme employing the proposed block modulation algorithm achieved efficient frame transmission by making use of a few preamble when carrier synchronization, symbol timing synchronization and slot timing synchronization were performed by burst data of ATM cell in LMDS environment. For performance evaluation of the proposed method, a simulation analyzing the variation of carrier synchronization, symbol timing synchronization and slot timing synchronization using LMDS environment and burst mode condition was executed. In the simulation, the proposed method showed a good performance even though the reduced preamble as a few aspossible when carrier synchronization, symbol timing synchronization and slot timing synchronization is performed.

Keywords

References

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