With the rapid development and worldwide deployment of broadband wireless communication and digital broadcasting infrastructures, the use of digital processing technology in the front-end and radio frequency unit is growing explosively. Digital processing technology for front-end in transmitters and receivers of wireless communication and digital broadcasting covers a broad range of topics including digital predistortion (DPD), digital up-conversion (DUC), digital down-conversion (DDC), DC-offset calibration, peak-to-average power ratio (PAPR) or crest factor reduction (CFR), pulse-shaping, delay/gain/imbalance compensation, noise-shaping, numerically controlled oscillator (NCO), and conversion between the analog and digital domains. These digital processing technologies offer a number of advantages in power efficiency, cost reduction, time-to-market, and flexibility for software defined radio (SDR) so as to support multiple standards and multimode applications. Unlike baseband processing, front-end is tightly connected to the radio frequency layer, therefore it imposes great limitations and difficulties on digital processing speed, memory, computational capability, power, size, data interfaces, and bandwidths. This suggests that digital processing and circuit implementation of front-end are very challenging tasks and require the huge efforts of the related industry, research, and regulatory authorities.
From an application and implementation design point of view, this book aims to be the first single volume to provide a comprehensive and highly coherent treatment on digital front-end and its system integration for multiple standards, multi-carrier and multimode in both broadband communications and digital broadcasting by covering basic principles, signal processing algorithms, silicon-convergence, design trade-off, and well-considered implementation examples.