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CDMA Systems Engineering Handbook - download pdf or read online

By Jhong Sam Lee, Leonard E. Miller

ISBN-10: 0890069905

ISBN-13: 9780890069905

Boost your wisdom of Code department a number of entry (CDMA) expertise, and construct an excellent figuring out of the technical info and engineering layout rules in the back of the strong new IS-95 electronic mobile procedure usual with this complete reference instrument. established upon the authors' high-impact foreign education seminars on CDMA process engineering know-how, this e-book is helping training mobile engineers greater comprehend the technical parts linked to the CDMA method, and the way they're utilized to the IS-95 standard.Practicing engineers who paintings with CDMA mobile, computers, and WLL structures must have this advisor shut to hand, yet no matter if you are engineering historical past is not CDMA-specific, you will savour the book's easy-to-follow, instructional method of the know-how. choked with approximately 2,000 equations, and supported via truly offered, easy-to-understand reasons and examples, it not just exhibits you the way to use real-world CDMA process layout recommendations similar to telephone making plans and optimization - it is helping the underlying purposes in the back of specific CDMA procedure layout decisions. particularly, you learn...* Proven-under-fire thoughts that assist you examine approach modulation and convolutional codeperformance, and optimize mobile method and Erlang capability* find out how to layout PN code turbines for spread-spectrum functions, and the way to exploit mask to regulate PN code section* how one can use RAKE range combining concepts to strive against fading* how you can keep watch over CDMA ahead hyperlink energy allocation to assist maximize approach capacityAn crucial reference device for CDMA process layout engineers,service prone specialists, and technical managers, the e-book additionally equips R&D execs with the data they should strengthen instruments to reinforce new or present CDMA mobile, desktops, and WLL platforms.

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8 in terms of bandwidth occupancy as a function of time. Within each hop period Th, there can be more than one modulation symbol, with period Ts. " If Th is a submultiple of T,, with multiple hops per symbol, as is typical for systems employing noncoherent frequency-shift keying, the system is said to be "fast hopping" [6-121. 55. 4 kbps. 8 Typical frequency-hopping waveform pattern. 15 16 COMA Systems Engineering Handbook To implement an F H system, a baseband or IF (intermediate frequency) communications waveform is shifted pseudorandomly in frequency on each hop using a digitally programmable frequency synthesizer, and it is necessary to have an identical, synchronized pseudorandom code generator6 and synthesizer in the intended receiver.

When frequency hopping is used as a CDMA technique, users broadcast F H signals simultaneously and care is taken to avoid or minimize collisions of hops from different users. In DS spread-spectrum systems [ 6 , 13, 141, typically the symbol rate (l/Ts) of a f binary baseband data waveform is increased by multiplying it with a pseudorandom f binary waveform whose "chip" rate (l/T,) is much faster than the symbol rate (Ts = NT,). " In the figure, which shows a single-sided RF spectrum7, the signal power is indicated to be Ps = A I W = AoB, implying that the spectral density of the spread signal is reduced by the factor A1/Ao = W / B = 1/N from its level without spreading.

If the duty cycle of the speech traffic channels in the CDMA system is denoted by the variable a , then the capacity equation becomes The capacity equations shown thus far do not consider the directivity, if any, of the base station receiving antennas. If the base station employs directional antennas that divide the cell into sectors, each antenna will only receive a fraction of the interference from within the cell. In practice, the receiving antennas have overlapping coverage areas of approximately 15%.

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


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