Doc.: IEEE 802.11-01/232r0 Submission March 2002 Todor Cooklev, AwareSlide 1 Extended Data Rate 802.11a Marcos Tzannes Todor Cooklev Dongjun Lee Colin.

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Presentation transcript:

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 1 Extended Data Rate a Marcos Tzannes Todor Cooklev Dongjun Lee Colin Lanzl Aware, Inc Mt Diablo Blvd, suite 395 Lafayette, CA 94549

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 2 Extended Data Rate a There is a clear market demand for a higher data rate: –There are products and proprietary technologies that achieve a higher data rate; –The gap between wireless LAN and Ethernet is increasing with the latest Ethernet PHYs.

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 3 Bit-loading Bit Loading is the process of modulating a different number of bits on each carrier based on the SNR of the carriers a uses the simplest form of bit-loading – equal number of bits per carrier. Equal number of bits per carrier is poorly suited to the characteristics of a multipath channel

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 4 Bit loading Bit loading requires a feedback from the receiver to the transmitter The communication from the receiver to the transmitter must happen faster than channel changes

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 5 Trellis-coded modulation (TCM) TCM combines coding and modulation functions to provide improved performance Coded modulation schemes do not encode all information bits and therefore must be combined with bit loading Coded modulation schemes (such as TCM) will typically outperform convolutionally encoded systems such as those used in a (especially with large constellations size)

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 6 Simulation TX power = dBm/Hz RX noise figure of 10 dB Implementation loss of 5 dB Thermal noise floor of –174 dBm/Hz Lower UNI-I band operation, channel with a 100 ns rms delay spread a vs a+bit loading and trellis coding

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 7 Channel characteristics

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 8 Performance comparison

doc.: IEEE /232r0 Submission March 2002 Todor Cooklev, AwareSlide 9 The described scheme Does not have a pre-set maximum data rate Is optimally suited to the characteristics of a multipath channel Based on mature and widely understood technology, used in the ADSL standard of G Requires relatively small standardization effort