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

By Samuel c. Yang

Drawing upon his event in construction the 1st significant CDMA community in North the US, Samuel Yang explains the necessities of CDMA instant expertise, assisting the reader collect the data had to engineer and enforce an IS-95 established CDMA process. reading either the theoretical and sensible aspect of CDMA engineering, this advisor is designed for working towards 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 in particular invaluable.

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Given the four information bits (i1 , i 2 , i 3 , i 4 ), the three extra redundancy bits (r1 , r2 , r3 ) are appended using the following functions [3]: r1 = i1 + i 2 + i 3 r2 = i 2 + i 3 + i 4 r3 = i1 + i 2 + i 4 where + represents modulo-2 addition. For example, if the information bits are (1, 0, 1, 0) corresponding to (i1 , i 2 , i 3 , i 4 ), then the extra redundancy bits are 38 CDMA RF System Engineering r1 = 1 + 0 + 1 = 0 r2 = 0 + 1 + 0 = 1 r3 = 1 + 0 + 0 = 1 and the code word (1, 0, 1, 0, 0, 1, 1) is used to represent the four information bits.

6) can also be written as g '( x ) = x 8 + x 7 + x 5 + x 3 + x 2 + x + 1 g '' ( x ) = x 8 + x 5 + x 4 + x 3 + x 2 + 1 IS-95 CDMA uses a different convolutional coding scheme on the reverse link (mobile station to base station). Since the mobile has a limited transmit power, the reverse link can sometimes be the limiting link. Thus a more powerful convolutional code of rate 1/3 and constraint length K = 9, is used. In this case, three bits are generated for every input bit, and the output rate is effectively three times the input rate.

5) on a log-log paper, then the slope of the curve would be −20 dB/ decade. The free-space model is based on the concept of an expanding spherical wavefront as the signal radiates from a point source in space. ” In a mobile communication system where additional losses are introduced by terrestrial obstacles and other impairments, alternative models are needed to accurately predict propagation loss. 2 Lee Model The propagation environment in terrestrial communication is worse than that in free space.

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