CDMA RF System Engineering (Artech House Mobile by Samuel c. Yang

By Samuel c. Yang

Drawing upon his adventure in development the 1st significant CDMA community in North the United States, Samuel Yang explains the necessities of CDMA instant know-how, assisting the reader gather the information had to engineer and enforce an IS-95 dependent CDMA approach.

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Additional info for CDMA RF System Engineering (Artech House Mobile Communications)

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In a voice communication system, the source information is human speech; speech is inherently analog and must be converted (coded) to a digital form before it Fundamentals of Digital RF Communication 31 can be transmitted via the digital system. This coding of source information, or source coding, can use speech compression to reduce the number of bits necessary to represent speech. For example, the advanced mobile phone system (AMPS) transmits speech using a 30-kHz bandwidth. 6 Kbps (Rate Set 1) of digital stream.

4] Hess, G. , Land-Mobile Radio System Engineering, Norwood, MA: Artech House, 1993. [5] Jakes, W. , Microwave Mobile Communications, New York, NY: John Wiley & Sons, 1974. , Cellular Radio Performance Engineering, Norwood, MA: Artech House, 1994. Select Bibliography Lee, W. C. , Mobile Communications Engineering, New York, NY: McGraw-Hill, 1997. Lee, W. C. , “Lee’s Model,” Proc. , IEEE, 1992, pp. 343–348. Rappaport, T. , Wireless Communications: Principles and Practice, Englewood Cliffs, NJ: Prentice Hall, 1995.

The excitation parameters and filter coefficients are the outputs of the speech encoder. In the IS-95 CDMA system, these parameters and coefficients are the information that is communicated between the transmitter and receiver. The voice decoder at the receiving end uses these parameters and coefficients to construct the excitation source and synthesis filter. The result is estimated speech ~ S (z) at the output of the voice decoder. Linear-predictive coding (LPC) is widely used to estimate filter coefficients.

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