from Part III - DUC, DDC, ADC, DAC, and NCO
Published online by Cambridge University Press: 07 October 2011
Contemporary wireless communications have expanded to provide a multitude of services ranging from mobile telephony and satellite navigation to Internet access and image or video transfer. These functions have been made possible by the digital signal processing (DSP) techniques implemented in dedicated hardware. In addition to the primary functions also various digital techniques must be employed to ensure integrity and reliability of communications systems, increasing thereby the demands for the system throughput. To enable ever higher data rates both wider channel bandwidths and advanced DSP techniques such as Orthogonal Frequency-Division Multiplexing (OFDM) and multi-bit quadrature amplitude modulation (QAM) are used. These solutions place more demands on the signal-to-noise ratio (SNR) and peak-to-average power ratio (PAPR) of the signals, and in effect, on the dynamic range (DR) and linearity of the analog front-end of a transceiver.
The requirements on the interface between the digital and analog front-end part are just as important. In fact, the quality of the A/D and D/A data conversion largely decides the performance of the received and transmitted signal. The demands placed on the data converters in wireless transceivers are exacerbated in terms of multimode operation, and are pushed to an extreme for the software defined radio (SDR) where the converters should be placed close to antenna [1].
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