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Title: Digital polar transmitter for multi-band OFDM ultra-wideband
Keywords: Polar Transmitter Multi-band OFDM Ultra-wideband UWB
Issue Date: 6-Mar-2009
Citation: LOKE WING FAI (2009-03-06). Digital polar transmitter for multi-band OFDM ultra-wideband. ScholarBank@NUS Repository.
Abstract: Multi-Band Orthogonal Frequency Division Modulation (MB-OFDM) Ultra-Wideband (UWB) suffers from a large peak-to-average ratio (PAR). Systems with large PAR require the linear power amplifier (PA) to back off from its maximum output power to ensure that the peak of the power is within the linear range of operation, hence, resulting in poor efficiency. Although the problem of low power efficiency and high PAR may be solved by polar modulation, the performance of polar transmitter is often degraded by non-ideal implementations.To take advantage of the advancement of deep-submicron semiconductor technology which favors more digital circuitries, a new digital polar transmitter (DPT) for MB-OFDM UWB is proposed. It consists of a digital phase modulator (DPM) for generating the phase-modulated radio frequency (RF) signal and a digital power amplifier (DPA) for modulating the amplitude of the RF signal. The non-idealities in the amplitude and phase signals, like delay mismatch, mismatch in gain and error in phase, in this DPT are investigated in this thesis.
Appears in Collections:Master's Theses (Open)

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