Implementation of high-speed multi-level QAMmodems based on Xilinx virtex-II FPGA - Electrical and Computer Engineering, 2003. IEEE CCECE 2003. Canadian Conference on

Ab s t r a E t This paper describes an implementation of high-speed multi-level Quadrature Amplitude Modulation (QAM, modems using Xilinr Krtex-II Field Programmable Gate Arrays (FPGA). The design starts with system-level simulations and exploits different architectures and algorithms available for digitalfilters, which is a key component of a QAM modem. System efticiency is highlighted with the parallel-pipelined structure and Look-Up Table based implementation, such that the design benefitsfrom performance as well as chip size. Suflcient arithmetic precision is employed in the internal data-path to avoid the possibiliry of overflow so that the digital filter always presents a &I[-precision result at its output; thus precision need not be sacrzjiced to attain high-speed The benchmarks indicate that the maximum input bit rate can reach 330Mbps for 64-QAM