A digital up-conversion architecture for future high efficiency wireless base stations

Bassoo, Vandana (2010) A digital up-conversion architecture for future high efficiency wireless base stations. PhD thesis, Victoria University.

Abstract

Over the past few years, there has been a growing need for wireless communications with higher data rates and ubiquitous coverage, and these must be achieved at reduced cost and with a lower carbon footprint. This evolution in wireless demand places a big burden on transmitter architectures. The need for higher efficiency has stimulated research into the potential replacement of current linear power amplifiers (PAs) by switch mode power amplifiers (SMPAs) at cellular frequencies. The radio frequency (RF) PA currently accounts for a significant part of the cost, and most of the power requirements of a typical wireless base station. This research is focused on the modulation and up-conversion circuits for generating the SMPA drive signals. The switched (‘on’/‘off’) nature of the amplifier drive signal creates an opportunity for an all-digital solution removing traditional analog components such as the digital to analog converters, reconstruction filters, quadrature modulator and local oscillators. Digital signal processing techniques used for signal modulation are extended to digital up-conversion to generate suitable drive signals for the SMPA. In this thesis, a sigma-delta (ΣΔ) based technique is used to embed a complex modulation scheme such as OFDM into a single ‘on’-‘off’ bit stream.

Item type Thesis (PhD thesis)
URI http://vuir.vu.edu.au/id/eprint/16051
Subjects Historical > Faculty/School/Research Centre/Department > Centre for Telecommunications and Micro-Electronics (CTME)
Current > FOR Classification > 1005 Communications Technologies
Keywords wireless communications, digital up-conversion, digital up-conversion architecture, high efficiency, wireless base stations, linear power amplifiers, PAs, switch mode power amplifiers, SMPAs, radio frequency, RF, circuits, SMPA drive signals, amplifier drive signals, analog, digital, digital signals, digital signal processing techniques, signal modulation, polar values, pulse widths, pulse positions, pulse position modulation, PPM, amplifiers, transmitters, Cartesian sigma delta architecture, polar quantisation plane, pulse modulation converters
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