According to Freescale guy Matt Wellborn, UWB is faster, cheaper, and less power-hungry than 802.11n:
Current proposals for scaling 802.11 systems to higher rates (500 Mbits/s or more) in 802.11n are based on the continued use of 64-QAM. Scaling to higher rates will be enabled through the use of multiple-input-multiple-output (MIMO) techniques that use multiple antennas to send multiple data streams in parallel through the wireless channel. For this approach, the processing complexity also increases with data rate (FEC decode, FFT/iFFT, equalization, etc). There will also be increased complexity and power consumption due to the requirement for up to 4 transmit/receive processing chains (multiple ADC/DAC pairs, filters, amplifiers, etc).
As digital process technology scales, the digital portions of each system will scale much faster to lower cost and power. The significant analog potions of the system will scale more slowly and will thus have a proportionally bigger impact when these functions represent a larger portion of the implementation. The power consumption and area required for large ADCs and linear PAs becomes a bigger factor as digital technology scales in the future.
As we evaluate the two technologies for very high rate, low power applications, we see that the impact of system bandwidth is significant in many areas. As the narrowband designs are extended to higher rates, the use of high order modulation and multiple-antenna technologies can provide scalable and robust performance, but will also likely lead to increased complexity and power consumption. Systems that use wider bandwidths, such as DS-UWB, can use fundamentally different design approaches to provide wireless connectivity solutions that scale to even higher data rates with more scalable and lower complexity implementations.
Is he right?