IMPROVING THE FREQUENCY RESOLUTION OF DIGITALLY SYNTHESIZED PERIODIC SIGNALS BY A SEQUENTIAL ADDRESSING SCHEME

In the digital synthesis of wideband periodic signals using an Arbitrary Waveform Generator （AWG）, the frequency resolution and spectral complexity of the synthesized signals are commonly limited by the memory capacity and clock frequency of the AWG. This paper proposes a novel sequential addressing scheme and then presents several sequences to improve the frequency resolution of the synthesized periodic signals without changing their spectral envelopes and basic time-domain characteristics under the condition of a fixed memory capacity and a fixed clock frequency. The main idea of the scheme is using the address generator in an AWG to program and produce addresses to read fixed waveform data in variable order, and thus to generate waveforms of various periods and profiles. The scheme is applied in simulating signal scenarios for military communication countermeasure experiments, and achieves high performance.