A search for ‘Software Defined Radio’ on at the end of 2010 shows that almost 50 books have been written on the subject. The earliest book was published in 2000 and a steady stream of new titles has been coming out since. So why do I think that yet another book is warranted? SDR is now a mature field, but most books on the subject treat it as a new technology and approach SDR from a theoretical perspective. This book brings SDR down to earth by taking a very practical approach. The target audience is practicing engineers and graduate students using SDR as a tool rather.