Delta Sigma Modulation based All Digital Transmitter for Upcoming SDR applications

This paper presents design and implementation of an all-digital transmitter using delta sigma modulation (DSM). A digital up-conversion technique is discussed in this paper to upconvert the baseband signal to RF carrier frequency in digital domain. All digital transmitters are digital in nature from baseband signal to RF upconversion. Therefore, such all-digital transmitters are very useful in upcoming advanced 5G communication systems. The proposed all digital transmitter architecture is verified in simulation and hardware using 20 MHz long term evolution (LTE) signal with 11 dB peak to average power ratio (PAPR). The measurement results show the good performance of transmitter using digital upconversion technique. The proposed all digital technique is verified using 2
^nd
, 3
^rd
and 4
^th
order low pass DSM (LP-DSM) with different quantized levels. The performance of proposed scheme in terms of coding efficiency (CE) and signal to noise distortion ratio (SNDR) is discussed in this paper.