The aim of the book is to design, simulation and implementation of the Discrete Multitone (DMT) modulation for ADSL based on Software Defined Radio (SDR) using FPGA. DMT divides the available bandwidth into parallel sub-channels. The main units of the DMT modulator are serial to parallel converter, symbol mapping, IFFT, parallel to serial and cyclic prefix. There are two techniques to transmit data namely complex transmission and real transmission .Real transmission is preferred for DSL, since it needs single wire but uses twice number of IFFT.

This work includes a proposed wireless AM system based on SDR using FPGA. The main units of this system are BPSK modem, QPSK modem , 8QAM modem , inserting pilot channel and SNR measurement channel. The backbone of AM is the real time measurement of the SNR in order to select the required AM technique . The measurement of SNR is required to separate the noise from receiving signals in order to find SNR. There are two techniques to separate noise from receiving signals either using the detected signal or by using pilot symbol assisted modulation (PSAM) technique.