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The orthogonal frequency-division multiplexing (OFDM) is a multicarrier modulation scheme developed for wideband communication applications. An inherent problem of the OFDM signal is that it could suffer from nonlinearities of power amplifiers in a communication link. For a nonlinear bandpass channel, the complex envelopes of its input and output are often related by a complex baseband equivalent...
A direct conversion transmitter for mobile WiMAX/WiBro applications is developed. It is composed of a reconstruction filter, an I/Q modulator, a four-stage RF programmable gain amplifier (PGA), and a power amplifier (PA) driver. A 7-bit digital-to-analog converter (DAC) is also implemented to compensate the DC offset in the modulator due to device mismatch. A 72-dB gain control range in 1-dB step...
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