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Wireless Receiver Design for Digital Communications 2nd Edition by Kevin McClaning | PDF Free Download.
There have been two paradigm shifts since we wrote the first edition of this book. The first major shift is that the world is now full of digital signals.
Commercial television and radio have changed from analog to digital formats. Cellular telephone signals are digital, and even video baby monitors transmit digital signals. I’m not sure you can even find an analog signal on the air anymore.
In a way, this is sad. In the “either you get a perfect signal or you get nothing” world of the digital broadcast, our children will never know the distinct pleasure of watching a snowy ultrahigh-frequency (UHF) broadcast or listening to a crackling AM radio station after it has traveled from the other side of the nation.
The second paradigm shift since the publication of the first edition is the availability of inexpensive digital processing power.
As of this writing (early 2011), processing power is essentially free. In the past, radio receivers performed filtering and demodulation in the analog world. Many old-school receivers performed demodulation using analog techniques that were finicky and required large amounts of circuit board real estate.
Control functions such as automatic gain control (AGC) and automatic frequency control (AFC) were realized in the analog world using individual diodes, operational (op) amps, resistors, and capacitors.
Today, it makes technical and economic sense to perform these functions in the digital domain. We find ourselves in a world where the receiver is primarily a downconverter whose sole purpose is to translate the signal of interest to a frequency and power level that is suitable to be sampled by an analog-to-digital converter (ADC).
Similarly, transmitters convert the user’s information into complex waveforms using digital signal processing (DSP) techniques. A digital-to-analog converter (DAC) then converts these signals to the analog domain.
The transmitter’s remaining task is to convert the modulated signal to its final frequency and power level. However, it is still an analog world, and we must address analog concepts.
Our receivers require analog filters, and, although filter realizations have changed, filtering concepts of previous years have remained valid and useful.
Oscillator phase noise is essentially low-level, accidental analog phase modulation, and it still limits receiver performance in many areas.
Linearity, as measured by component compression points and second- and third-order intercept points is very important in a world that contains many signals existing in proximity.
The format of this book reflects the state of receiver design as it exists in early 2011. I have only lightly updated many chapters from the previous edition as the material there continues to be relevant and useful.
I added chapters on ADCs and included an overview of the demodulation of digital signals as it is performed in the digital domain.
As in the first edition, I leave you with a quote from Groucho Marx: “Why a 4-year-old child could understand this report. Run out and find me a 4-year-old child. I can’t make head or tail out of it” (from Duck Soup).
My sister, the lawyer, said that, if we wanted this book to sell, we needed to put in a bloodthirsty clown who lives in the sewers. So far, though, we haven’t been able to work him in. We write as engineers.
We don’t pretend to be heavy theoretical types, but we do write in the hope that this book will be useful. We didn’t concentrate on technology but on useful and proven concepts.
Some of the most useful books we own were written in the 1940s by fellows named Frederick Terman, John Kraus, and Mischa Schwartz.
Sure, the books contain a lot of information on electron tubes and are a little light on modern filter design, statistical decision theory, and quadrature modulation, but they are clear and well written. They were formulated by engineers for engineers, and as such, they are still useful.
We hope that in 20 years people will say, “The McClaning/Vito book is a little dated, but it’s clear and well written.” We made up our minds early to follow one cardinal rule: to be clear. If we have succeeded, errors should be easy to detect.
If we hear about errors in this book (and I hope we do), I consider it a good thing. It means we have been clear enough to bring doubts into the reader’s mind.
The reader is thinking about the material and understands it enough to find inconsistencies. We’d like to thank our normally noisy children, Chris and Jenny (McClain) and Mandy, Nick, Steve, and James (Vito) for being quiet while we wrote this.
We’d also like to thank our wives, Kitty and Terri, for putting up with us (and not just while we were writing this book).
We’ll leave you with a quote from Groucho Marx: “From the moment I picked up your book until I laid it down, I was convulsed with laughter. Someday, I intend reading it” (quoted in Life, February 9, 1962).
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