The paper presents a. practical scheme for building high frequency direct digitizing transmitters. The transmitter uses a. simple lookup table approach to generate a binary stream which is then merely filtered to produce the radiated signal. Thus, there is no need for precise digital to analog converters. A new constrained list decoding algorithm operating over the real alphabet produces the data in the lookup table. The transmitter can be a modulator only or a combined encoder and modulator. The paper concludes with spectra and error vector magnitude measurements for GMSK with frequencies over 10 GHz.
['Oliver M. Collins', 'Jagadish Venkataraman']
Continuous modulation from a single-bit DSP output