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A digital OFDM modulator with 2048-point IFFT and 83.2 MHz bandwidth is implemented. The modulator consists of IFFT block, upsampling filters and upconversion included in the upsampling operation. Also a clipping unit is implemented before the on-chip D/A-converter in order to efficiently utilise the whole dynamic range of the converter and to maximise the(More)
In conventional base station solutions, the carriers transmitted are combined after the power amplifiers. An alternative to this is to combine the carriers in the digital domain. The major drawback of the digital carrier combining is a strongly varying envelope of the composite signal. The high PAR sets strict requirements for the linearity of the power(More)
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