The low-area of new arc-tangent look-up table and a low overhead for CATV modem systems

Makes possible a removal of the preamble for carrier recovery and symbol-timing recovery by storing a burst in memory with low overhead quaternary phase shift keying (QPSK) demodulation method which also effects frame efficiency improved by processed synchronization performance. In this paper, we propose the new algorithm for arc-tangent look-up table which transforms the input I, Q data by phase. This I, Q data plays an important role in demodulation and realises a demodulator with low-overhead by storing a burst in memory.