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SUMMARY OF SOURCE CODING TECHNIQUES The information rate needed to commuicate the speech message can range from as little as 100 bit/s to as much as 64,000 bit/s. The feasibility of bit rates as low as 100 bit/s can be easily demonstrated by two examples, summarized in Table 1. The first example uses phonetically coded speech as the means of encoding and transmitting the word information content of the speech message. Phoneticians have long recognized that the word information content of speech can be translated into fractional utterances called phonemes.

D f vs t^, γ = 2. BANDWIDTH- A N D POWER-EFFICIENT MODULATION SYSTEM h FIGURE 9b. i df vs h , γ = 3. 49 RUSSELL J. F. FANG 50 FIGURE 9c. d f vs h , γ = 4. BANDWIDTH- AND POWER-EFFICIENT MODULATION SYSTEM FIGURE 9d. d f vs h±9 γ = 5. 51 RUSSELL J. F. FANG 52 FIGURE 9e. d f vs h , γ = 6. /h 0 =1/2 , CODED QPSK WITH VA DECODING (BUT NO STATE EXTENSION) @ ISI h i / h 0 = 1/2 , CODED QPSK WITH EXTENDED STATE VA DECODING (§> ISI h^hQ =1/6 ,CODED QPSK WITH VA DECODING © ISI h i / h 0 = 1/6, CODED QPSK WITH EXTENDED STATE VA DECODING ι I I I I 8 10 E b / N c (dB) FIGURE 10.

Department of Elec. Eng. and Comp. Science. INTESLAT Document, INTELSAT V TDMA/DSI system specification, BG-Temp. 42-109E (Rev. 1) June 11, 1980. l 1974. Transmission of 4-phase shift keyed time division multiple access over satellite channels. IEEE Transactions on Communications. McCreath, D. and McLane, P. 1979. Filter parameter optimization for linear and nonlinear BPSK transmission. IEEE Transactions on Communications, Vol. 27, No. 1. Ungerboeck, G. 1977. Channel coding with multilevel/phase signals.

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