Interpretation of data and results in this experiment

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Canaya, Regina Marie V. INTERPRETATION OF DATA AND RESULTS In this experiment, the students used an M LEVEL ENCODER, a continuous sequence of TTL-level data bits is grouped into sets of 'L' bits, (where L = 2, 3 or 4). Each set of 'L' bits is encoded to form a pair of M- level baseband signals, q & i. This q & i signal pair can be represented as 2 L unique points (or symbols) in a signal-state-space diagram, or constellation. Six different encoding formats are available, selected via front panel switches, for generating 4-QAM, 8-QAM, 16-QAM, 4-PSK, 8-PSK & 16-PSK signals which can be seen in figures 2.b, 3.b, 4.b, 5.b, 6.b, 7.b and 8.b. The two front panel CONSTELLATION SELECT switches are used to choose the encoding format required. The upper, 2 position switch selects between either a circular (phase) or square (amplitude) array. The lower, 3 position switches selects the number of points in the constellation: 4, 8 or 16. The input signals, q & i, are sampled at a point determined by the user. Using an oscilloscope, the decision point is displayed as a bright marker on the input waveforms. The sampled and held q & i signals are also output Q & I. Seven different decoding formats are available. The six standard operating mode formats, 4-QAM, 8-QAM, 16-QAM, 4-PSK, 8-PSK & 16-PSK are selected via front panel switches. The seventh decoding format, BPSK,
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  • Summer '18
  • Electronics Engineering, Quadrature amplitude modulation, Phase-shift keying, binary message, PSK constellation diagram, Regina Marie

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