Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique which provides higher
bit rate and efficient bandwidth. This paper presents an implementation of a 4/16/64 Order Quadrature
Amplitude Modulation (QAM) Mapper-Demapper for 256 Sub channel OFDM Model on Xilinx
SPARTAN 3E Field-Programmable Gate Array (FPGA) series, using schematic approach. This QAMOFDM
model is reconfigurable in term of its QAM order. The result shows that under the clock frequency
around 262 MHz, the implementation works well, high precision is achieved at its serial output. A
precision process conducted at 20 ns internal clock input period, with the 25 Mbps input bit rate requires
81.94 μs QAM processing-time. The implementation consumes about 80 % of the total FPGA slices (3736
slices).
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