Mobility

Quantization Noise Suppression for Envelope Pulse-Width Modulation (EPWM) Transmitters

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Executive Summary

Modern wireless broadband communication systems utilize multicarrier modulation schemes such as the Orthogonal Frequency Division Multiplexing (OFDM) in order to achieve high spectral efficiency. However, multicarrier systems are known to suffer high Peak-to-Average Power Ratio (PAPR) that leads to low power efficiency when using conventional linear amplifiers. Several transmitter architectures such as Doherty amplifiers and Kahn's Envelope Elimination and Restoration (EER) techniques have been proposed to improve power efficiency. The Envelope Pulse-Width Modulation (EPWM) transmitter is an alternative solution for providing highly efficient linear amplification. The EPWM transmitter is based on polar modulation in which the phase and envelope components are processed separately.

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