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Modulation & Demodulation Techniques : ASK , FSK , BPSK , DBPSK Internal Data Generator : Digital Data Data Pattern : 8-Bit , 16-Bit , 32-Bit , 64-Bit Frequency : 2KHz, 4KHz, 8KHz, 16KHz Internal Carrier Generator : Direct Digital Synthesized Carrier Signal : Sine Wave SMD LED Indicators : 24 nos for Digital Data Selection , Data frequency selection & Technique selection Number of Test Points : 40 nos.
Iridium system employs a BPSK modulation and forward error correction coding in the form of convolutional encoding with Viterbi decoding (Viterbi 1971).
Signal constellations for BPSK modulation scheme at the phase offset of 20[degrees] in the uplink and the downlink are shown in figure 5 (distortions are caused by HPAs and phase offset), and the frequency offset in the uplink and the downlink at 2 Hz is provided in figure 6 (distortions are caused by HPAs).
16 fixed Wimax standard, six transmission modes along with new modulation of BPSK are considered.
2002:7*); succeeded in office, 2002-5, by DP AH (later YD/YB POK Johan Pahlawan) Adanan bin BPSK DSS HA Mohd Yusof.
11a/g features are supported including data scrambling, forward error-correction via convolutional encoding at rates from 1/2 to 3/4, sub-channel coding of BPSK, QPSK, 16QAM or 64QAM, both short- and long-training sequences, pilot insertion, and the IFFT/FFT required to convert to/from time-domain RF I/Q signals.
According to Sklar (Sklar, 2002), turbo codes were first introduced in 1993 by Berrou, Glavieux, and Thitimjshima achieving a bit-error probability of 10-5 using a rate 1/2 code over an additive white Gaussian noise channel and BPSK modulation at an [E.
Each narrowband subcarrier can be modulated using various modulation formats; BPSK, QPSK and QAM (or differential equivalents).
Direct sequence spread spectrum techniques support different modulation and data rates: BPSK with 20 and 40 kbit/s, compliant to IEEE 802.
MMW radios use basis low-order modulation protocols like BPSK.
4 GHz 915 MHz 868 MHz Number of channels 16 10 1 Bandwidth (kHz) 5,000 2,000 600 Data rate (kbps) 250 40 20 Symbol rate (ksps) 63 40 20 Modulation method O-QPSK * BPSK ** BPSK Diffusion method DSSS *** DSSS DSSS Available regions Worldwide USA Europe O-QPSK * (Offset Quadrature Phase Shift Keying) BPSK ** (Binary Phase Shift Keying) DSSS *** (Direct Sequence Spread Spectrum)
The initial implementation supports satellite receive/transmit modem functions at a 70MHz IF and baseband with BPSK or QPSK direct or subcarrier modulation.
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