ABSTRACT
Coding and modulation refers to techniques that a transmitter can use to map digital information to the underlying wireless signal so that a receiver can retrieve the information from the signal using appropriate decoding and demodulation. Coding and modulation directly affect the achievable capacity, data rate, and reliability of the wireless communication. This chapter begins with an introduction to the basic concepts of wireless signals: frequency, wavelength, amplitude, phase, I-Q plots of amplitude and phase, time and frequency domain representations of wireless signals, wireless spectrum, and decibel, followed by key modulation techniques, namely Amplitude Shift Keying, Frequency Shift Keying, Phase Shift Keying, and Quadrature Amplitude and Phase Modulation, that are used in practical wireless and mobile networking systems. This chapter also covers a range of other important topics that directly or indirectly influence the wireless information transmission: Nyquist’s and Shannon’s theorems for channel capacity estimation, application of Hamming distance for error detection and correction, multiple access methods including Time Division Multiple Access, Frequency Division Multiple Access, and Code Division Multiple Access, spread spectrum techniques including Frequency Hopping Spread Spectrum and Direct-Sequence Spread Spectrum, Doppler shift and Doppler spread, coherence time and duplexing including Frequency Division Duplexing and Time Division Duplexing. [200 words]
