By Samuel c. Yang
Drawing upon his adventure in development the 1st significant CDMA community in North the USA, Samuel Yang explains the necessities of CDMA instant know-how, assisting the reader gather the data had to engineer and enforce an IS-95 established CDMA approach. interpreting either the theoretical and functional aspect of CDMA engineering, this consultant is designed for training RF and approach engineers who should still locate the modular-oriented chapters on spread-spectrum a number of entry method, layout and function engineering, CDMA site visitors engineering, and regulatory implications specially worthy.
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Additional info for CDMA RF System Engineering (Artech House Mobile Communications Library)
5 Frequency-selective fading is evident in the nulls of the transfer function. Radio Propagation 27 References  Lee, W. C. , Mobile Cellular Telecommunications: Analog and Digital Systems, New York, NY: McGraw-Hill, 1995. , “Empirical Formula for Propagation Loss in Land Mobile Radio Services,” IEEE Trans. on Vehicular Technology, Vol. VT-29, 1980, pp. 317–325.  Lee, W. C. , Mobile Communications Design Fundamentals, New York, NY: John Wiley & Sons, 1993.  Hess, G. , Land-Mobile Radio System Engineering, Norwood, MA: Artech House, 1993.
PCM is not feasible in wireless applications because there is a limited bandwidth available. Transmitting 64 Kbps of information over the air demands more bandwidth than can be afforded by most service providers. Therefore, alternative source coding techniques are needed to represent source information (human speech, in this case) using less bandwidth. A vocoder offers an attractive solution. It exploits the characteristics of human speech and uses fewer bits to represent and replicate human sounds.
The rate R of a code is defined as R= k n There are two major classes of error-correcting codes: block codes and convolutional codes. Block codes, as the name implies, code an information sequence one block at a time. Convolutional codes, on the other hand, have a memory property. The memory depends on the constraint length K of the convolutional code. The n-tuple output of a convolutional encoder is not only a function of one input k-tuple, but also a function of the previous K − 1 input k-tuples .