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The Potomac River meanders in its 383-mile journey past natural settings of the forests, rocks and falls (Great Falls, Little Falls, Three Sisters Rocks, Mather Gorge), the convergence of other rivers into the Potomac (the Shenandoah River at Harpers Ferry, the Eastern Branch of the Potomac at Washington, D.C., now called Anacostia River) and the architecture of man-made points of interest (Mount Vernon, the John F. Kennedy Center for the Performing Arts, Harper's Ferry, Fort Washington). Douglas Campbell (writer) and Thomas Sherman (artist) followed the entire length of the winding Potomac through its four distinct geographical areas: the Appalachian highlands of the westernmost portion of Maryland and the northern portion of West Virginia, Maryland's Cumberland Valley (called Shenandoah Valley in Virginia), the rolling Piedmont country beyond the Catocin mountains and the brackish Tidewater area where the waters become affected by the tidal pulls of the sun and moon.
Orthogonal frequency-division multiplexing (OFDM) is a method of digital modulation in which a signal is split into several narrowband channels at different frequencies. CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimising the use of available bandwidth. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end. Multi-Carrier (MC) CDMA is a combined technique of Direct Sequence (DS) CDMA (Code Division Multiple Access) and OFDM techniques. It applies spreading sequences in the frequency domain. Wireless communications has witnessed a tremendous growth during the past decade and further spectacular enabling technology advances are expected in an effort to render ubiquitous wireless connectivity a reality. This technical in-depth book is unique in its detailed exposure of OFDM, MIMO-OFDM and MC-CDMA. A further attraction of the joint treatment of these topics is that it allows the reader to view their design trade-offs in a comparative context. Divided into three main parts: Part I provides a detailed exposure of OFDM designed for employment in various applications Part II is another design alternative applicable in the context of OFDM systems where the channel quality fluctuations observed are averaged out with the aid of frequency-domain spreading codes, which leads to the concept of MC-CDMA Part III discusses how to employ multiple antennas at the base station for the sake of supporting multiple users in the uplink Portrays the entire body of knowledge currently available on OFDM Provides the first complete treatment of OFDM, MIMO(Multiple Input Multiple Output)-OFDM and MC-CDMA Considers the benefits of channel coding and space time coding in the context of various application examples and features numerous complete system design examples Converts the lessons of Shannon’s information theory into design principles applicable to practical wireless systems Combines the benefits of a textbook with a research monograph where the depth of discussions progressively increase throughout the book This all-encompassing self-contained treatment will appeal to researchers, postgraduate students and academics, practising research and development engineers working for wireless communications and computer networking companies and senior undergraduate students and technical managers.
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