期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2013
卷号：3
期号：1
出版社：S.S. Mishra
摘要：Digital modulation is less complex, more secure and more efficient in long distance transmission. The noise detection and correction in digital is more efficient than analog counterpart. So it has more importance in modern communication. Digital modulation represents the transfer of the digital bit stream from the transmitter to the receiver via the analog channels. During the modulation process the information signal modifies one or more carrier parameters, leading to shift keying techniques. A very widespread solution is the Software Defined Radio (SDR), whose modulation/demodulation methodology consists in programming either software in a dedicated processor (DSP), or logic in a programmable logic device (FPGA). These digital modulation techniques can be realized using FPG A (Field -programmable gate-array). In literature survey found that design employs the minimum number of blocks necessary for achieving BASK, BPSK and BFSK modulation. The modulating and carrier signals can be user controlled and the modulators are developed and compiled to a Verilog Hardware Description Language (VHDL) netlist. The functionality of these digital modulators will be demonstrated through simulations using the Quartus II softwa re and experimental measurements of the real-time modulated signal via an oscilloscope.
关键词：C BASK; BFSK; BPSK; digital modulator; FPGA; Verilog
