Lect-32_07_2 - (bits/sym) 1962 Bell 201 2.4 1.2 4PSK 2 1967...

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1 Lecture – 32 Digital Modulation 03-04-2007
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2 Modulation E b /N o (P e = 1 x 10 -6 ) ( in dB) 1. BPSK 10.6 2. QPSK 10.6 3. 8PSK 14 4. 16PSK 18.3 5. 16QAM 14.5 6. 32QAM 17.4 E b /N o Requirement for M-ary PSK and QAM
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3 M k R R s MPSK MPSK MFSK MFSK MFSK kb/s ksym/s R/B E b /N o (dB) Min. BW R/B E b /N o (dB) (P e =1 x 10 -5 ) (kHz ) (P e =1 x 10 -5 ) 2 1 9.6 9.6 1 9.6 19.2 ½ 13.4 4 2 9.6 4.8 2 9.6 19.2 ½ 10.6 8 3 9.6 3.2 3 13.0 25.6 1/3 9.1 16 4 9.6 2.4 4 17.5 38.4 ¼ 8.1 R s --- symbol rate and M = 2 k . R/B --- bandwidth efficiency. R s = R / log 2 M Where R is the bit rate. Comparison of MPSK and Non-coherent Orthogonal MFSK
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4 Modulation – Constant & non-constant Envelope
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5 Channel Impairments manifested in signal constellation.
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6 Constellation for several Modulation states
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7 Year Name Max. Rate Symbol Rate Modulation Efficiency kbits/s ksym/s
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Unformatted text preview: (bits/sym) 1962 Bell 201 2.4 1.2 4PSK 2 1967 Milgo 4400 4.8 1.6 8PSK 3 1971 Codex 9600C 9.6 2.4 16-QAM 4 1 Paradyne (MP 14400) 14.4 2.4 64-QAM 6 1984 Codex 2600 16.8 2.4 Trellis Coding 7 256 QAM 1985 Codex 2680 19.2 2.74 8-D(state) 7 Trellis Coded 160-QAM Telephone Modem Milestones 8 Year Name Max. Rate Symbol Rate Modulation Efficiency kbits/s ksym/s (bits/sym) 1984 V.32 9.6 2.4 2-D, TC 4 32-QAM 1991 V.32 bis 14.4 2.4 2-D, TC 6 128-QAM 1994 V.34 28.8 2.4-3.4 4-D, TC ~9 960-QAM 1998 V.90 56 TCM (Trellis Coded Modulation) has made possible the development of very high speed modems. Telephone Modem Milestones 9 Signal sate space diagram for Linear Modulation 10 Power Spectral Density of QPSK, OQPSK & MSK...
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This note was uploaded on 09/24/2010 for the course MATHEMATIC AAOC C222 taught by Professor Prof.dilipkumarsatpathi during the Fall '07 term at Birla Institute of Technology & Science, Pilani - Hyderabad.

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Lect-32_07_2 - (bits/sym) 1962 Bell 201 2.4 1.2 4PSK 2 1967...

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