What are the key aspects of MB-OFDM based solutions that will provide low cost silicon?
The analog functionality is limited to direct down-conversion and low-pass filtering prior to analog to digital conversion. In addition, local oscillator frequency agility is needed to follow the time-frequency code sequences used to define each piconet. The use of a 528MHz bandwidth to capture the signal on each sub-band means that it is perfectly practical to perform the remaining signal processing in a CMOS ASIC. This means that apart from 2-3mm^2 dedicated to the analog front-end, the remaining functionality can be integrated in deep sub-micron CMOS processes resulting in Moore’s law scaling for the majority of the receive path functions. Furthermore, the key signal-processing block in OFDM (the FFT/IFFT) has been shown to require around 50k gates, which contributes only a very small area to the total silicon real estate. This may be compared with direct-spread UWB systems which require either to use analog correlators, or extremely demanding A/D convertors and associated digital c
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