By Samuel c. Yang
Comprehend the necessities of CDMA instant know-how and enhance the data you must layout and function both co-located AMPS and CDMA or devoted CDMA structures with this certain reference. Drawing upon his contemporary adventure in construction the 1st significant CDMA community in North the USA, the writer is helping you got the information you must engineer and enforce an IS-95 dependent CDMA method.
Examining either the theoretical and useful part of CDMA engineering, this finished advisor is a superb source for training RF and method engineers who will 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 beneficial. Engineering managers and administrators looking skillability in CDMA expertise will get pleasure from the author's skill to provide a ''big picture'' standpoint the place simply crucial and correct details to designing and optimizing a CDMA approach is gifted. A systemic process makes this an incredible ebook to be used in technical education and educational periods.
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Additional info for CDMA RF System Engineering
These source coding schemes for speech use what is called “waveform coding,” where the goal is to replicate the waveform of the source information. This is the reason why computer modems can be used over telephones; the information contained in the waveform generated by a transmitting modem can be reliably received by the receiving modem on the other end, and the Fundamentals of Digital RF Communication 33 reason is that PCM attempts to replicate the waveform regardless of whether or not the information contained in the waveform is human speech or modulated pitches generated by a modem.
The error-correcting codes are designed to combat errors resulting from fades and, at the same time, keep the signal power at a reasonable level. Most error-correcting codes perform well in correcting random errors. However, during periods of deep fades, long streams of successive or burst errors may render the error-correcting function useless. Interleaving is a technique for randomizing the bits in a message stream so that burst errors introduced by the channel can be converted to random errors.
For message one: m1 (t ) −1 1 1 m1 (t ) 1 1 1 1 −1 −1 −1 −1 1 1 1 1 w 1 (t ) −1 1 −1 1 −1 1 −1 1 −1 1 −1 1 m1 (t )w 1 (t ) −1 1 −1 1 1 −1 1 −1 −1 1 −1 1 Note that m1(t)w1(t) is the spread-spectrum signal of the first message. Similarly, for message two: m 2 (t ) 1 m 2 (t ) 1 1 1 1 1 1 1 1 −1 −1 w 2 (t ) −1 −1 1 1 −1 −1 1 1 −1 −1 1 1 m 2 (t )w 2 (t ) −1 −1 1 1 −1 −1 1 1 1 1 −1 −1 −1 1 −1 −1 For message three: m 3 (t ) −1 m 3 (t ) −1 w 3 (t ) −1 1 m 3 (t )w 3 (t ) 1 −1 −1 −1 1 1 −1 −1 1 1 1 1 1 1 1 1 1 −1 −1 1 1 −1 −1 1 1 −1 1 −1 1 1 −1 −1 1 1 −1 The spread-spectrum signals for all three messages, m1(t)w1(t), m2(t)w2(t), and m3(t)w3(t), are combined to form a composite signal C (t); that is, C (t ) = m1 (t )w 1 (t ) + m 2 (t )w 2 (t ) + m 3 (t )w 3 (t ) The resulting C (t) is C (t ) −1 −1 −1 3 −1 −1 3 −1 −1 3 −1 −1 50 CDMA RF System Engineering C (t) is the composite signal that is transmitted in the single RF band.