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Abstract

A circuit for detecting a frequency correction burst in a TDMA digital mobile communication system. The circuit comprises a first multiplier for inputting I-channel data modulated by a continuous phase shift key and multiplying the inputted I-channel data by a sine wave frequency of the frequency correction burst to produce a first channel signal I1(nT); a second multiplier for inputting Q-channel data modulated by the continuous phase shift key and multiplying the inputted Q-channel data by the sine wave frequency of the frequency correction burst to produce a second channel signal Q1(nT); a low-pass filter for lowpass-filtering the first and second channel signals I1(nT) and Q1(nT) to produce first and second filtered channel signals I2(nT) and Q2(nT); a first energy estimation unit for estimating energies of the first and second channel signals I1(nT) and Q1(nT), respectively to generate a first instantaneous signal energy E.sub.p (nT); a second energy estimation unit for estimating energies of the first and second channel signals I1(nT) and Q1(nT), respectively to generate a second instantaneous signal energy E.sub.q (nT); a normalization unit for normalizing the first instantaneous signal energy E.sub.p (nT) to the second instantaneous signal energy E.sub.q (nT) to generate a normalized signal G(nT); and a burst discriminator for detecting only a frequency correction burst from the normalized signal G(nT).

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