PSK_demodulator_datasheet.pdf - Data sheet for...

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SoftJin Technologies Pvt. Ltd. India: 102, 1 st Floor, Mobius Tower, SJR iPark, EPIP, White Field, BANGALORE – 560 066, Karnataka, India, Tel: 91-80-41779999, Fax: 91-80-41157070 US: 2900 Gordon Ave, Suite 100-11, Santa Clara, CA 95051, USA, Tel: (408) 773-1714, Fax: (408) 773-1745 Email: [email protected] Web: Page | 1 Data sheet for BPSK/QPSK/8PSK Demodulator Introduction: Phase Shift Keying is a digital modulation scheme that conveys data by changing, or modulating, the phase of a reference carrier signal. Any digital modulation scheme uses a finite number of distinct signals to represent digital data. PSK uses a finite number of phases, each assigned a unique pattern of binary bits. Usually, each phase encodes an equal number of bits. Each pattern of bits forms the symbol that is represented by the particular phase. The demodulator which is designed specifically for the symbol-set used by the modulator, determines the phase of the received signal and maps it back to the symbol it represents, thus recovering the original data BPSK,QPSK and 8PSK are three major Modulation Techniques used in most of the applications. Functional Description: The Demodulator performs carrier recovery using Costas loop and Symbol Timing Recovery using Early Late gate Algorithm. The QPSK Demodulator accepts 10 bit digital data input from the two ADC's and performs Complex Sine/Cosine multiplication on the Input data. Further it performs Square Root raised cosine filtering with the desired Roll-off factor. The Symbol Timing
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