CDMA Systems Engineering Handbook by Jhong Sam Lee, Leonard E. Miller

By Jhong Sam Lee, Leonard E. Miller

Develop your wisdom of Code department a number of entry (CDMA) know-how, and construct an exceptional knowing of the technical information and engineering layout ideas in the back of the strong new IS-95 electronic mobile approach average with this finished reference software. established upon the authors' high-impact foreign education seminars on CDMA approach engineering expertise, this ebook is helping practising mobile engineers greater comprehend the technical components linked to the CDMA method, and the way they're utilized to the IS-95 standard.Practicing engineers who paintings with CDMA mobile, desktops, and WLL platforms must have this consultant shut handy, yet whether you are engineering heritage isn't really CDMA-specific, you are going to have fun with the book's easy-to-follow, educational method of the know-how. filled with approximately 2,000 equations, and supported by means of basically offered, easy-to-understand motives and examples, it not just indicates you ways to use real-world CDMA method layout ideas comparable to cellphone making plans and optimization - it is helping you know the underlying purposes in the back of specific CDMA method layout decisions. in particular, you learn...* Proven-under-fire ideas that assist you examine method modulation and convolutional codeperformance, and optimize mobile method and Erlang potential* the right way to layout PN code turbines for spread-spectrum functions, and the way to take advantage of mask to manage PN code part* how one can use RAKE variety combining options to strive against fading* how you can keep watch over CDMA ahead hyperlink strength allocation to aid maximize method capacityAn crucial reference software for CDMA approach layout engineers,service companies specialists, and technical managers, the ebook additionally equips R&D execs with the data they should advance instruments to reinforce new or present CDMA mobile, desktops, and WLL structures.

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We proceed now to find the Fourier transform of the RepT(. ) function, which in effect is to find the Fourier transform of a periodic function. 27, where we see that the Fourier transform of the periodic function is a line spectrum with lines at intervals of 1/T and the envelope Y(f), the Fourier transform of one period of the periodic function. lo Strictly speaking, one cannot take the Fourier transform of a periodic signal because periodic signals have infinite energy. 23h) has validity if time and frequency are exchanged.

Cixi . . cn-1xn-l xn. + + + + + + + configuration. As is thoroughly discussed in Chapter 6, the sequences generated by such an LFSR with an initial loading of nonzero n-tuples in the n stages, are periodic sequences with length P = 2" - 1, and there are P different sequences of length P that are shifted versions of the given initial sequence of length P. The sequences generated in this way are the ones used. What is so special about these sequences that makes it possible to realize such CDMA systems as IS-95?

5 Let us assume that a linear filter, designated "ideal filter #I," has a rectangular amplitude frequency characteristic given by H ( f ) = Rect(f /Rc), where Rc is the cutoff frequency. 16 Fourier transform pair Rect(t) sinc( f ). 17 Fourier transform pair Rect(t/Tc) - Tcsinc(Tc f ). 18. Note that ideal filter #1 is has an impulse response that is neither finite (in time extent) nor causal. 6 We will show that shifted sinc functions are mutually onhogonal, namely that where m and n are integers.

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