Abstract
Reconfigurable and multi-standard RF front-ends for wireless communication and sensor networks have gained importance as building blocks for the Internet of Things. Simpler and highly-efficient transmitter architectures, which can transmit better quality signals with reduced impairments, are an important step in this direction. In this regard, mixer-less transmitter architecture, namely, the three-way amplitude modulator-based transmitter, avoids the use of imperfect mixers and frequency up-converters, and their resulting distortions, leading to an improved signal quality. In this work, an augmented memory polynomial-based model for the behavioral modeling of such mixer-less transmitter architecture is proposed. Extensive simulations and measurements have been carried out in order to validate the accuracy of the proposed modeling strategy. The performance of the proposed model is evaluated using normalized mean square error (NMSE) for long-term evolution (LTE) signals. NMSE for a LTE signal of 1.4 MHz bandwidth with 100,000 samples for digital combining and analog combining are recorded as −36.41 dB and −36.9 dB, respectively. Similarly, for a 5 MHz signal the proposed models achieves −31.93 dB and −32.08 dB NMSE using digital and analog combining, respectively. For further validation of the proposed model, amplitude-to-amplitude (AM-AM), amplitude-to-phase (AM-PM), and the spectral response of the modeled and measured data are plotted, reasonably meeting the desired modeling criteria.
Highlights
The transmitter is the key block in any wireless communication and sensor network
Block schematic the evaluation mixer-less three-way amplitude modulator-based transmitter, variable gain (VGA) are powered by a 5 Vcombining branch-by-branch digital with signal processing
The long-term evolution (LTE) signal is oversampled by a factor of 16 and the corresponding baseband signal has 100,000 samples which are sampled at a rate of 30.72 Msamples/sec
Summary
The transmitter is the key block in any wireless communication and sensor network. It performs the functions of digital modulation, frequency up-conversion, and amplification of the signal before transmitting it through the antenna to a remote receiver. Hammerstein, and memory polynomial, are proposed for modeling the non-linear distortions in the transmitters [6,7,8,9,10,11,12] introduced by the power amplifiers during during the the amplification amplification of of the the signal. The mixer-less branch-by-branch three-way amplitude modulator-based transmitter was proposed [20] This topology avoided the use of a phase shifter and, used three VGAs as proposed [20]. 2 introduces the mixer-less forward behavioral model for the mixer-less three-way transmitter architecture; Section describes modulator-based transmitter and proposed decomposition algorithm; Section 3 details the proposed the implementation of the transmitter architecture with analog and digital combining; Section forward behavioral model for the mixer-less three-way transmitter architecture; Section 4 describes the presents the measurement results;architecture and Section with 6 concludes the paper. Implementation of the transmitter analog and digital combining; Section 5 presents the measurement results; and Section 6 concludes the paper
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