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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 on theme: "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."— Presentation transcript:

1 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 Lanzl Aware, Inc. 3685 Mt Diablo Blvd, suite 395 Lafayette, CA 94549

2 doc.: IEEE 802.11-01/232r0 Submission March 2002 Todor Cooklev, AwareSlide 2 Extended Data Rate 802.11a 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.

3 doc.: IEEE 802.11-01/232r0 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. 802.11a 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

4 doc.: IEEE 802.11-01/232r0 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

5 doc.: IEEE 802.11-01/232r0 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 802.11a (especially with large constellations size)

6 doc.: IEEE 802.11-01/232r0 Submission March 2002 Todor Cooklev, AwareSlide 6 Simulation TX power = -56.9 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 802.11a vs 802.11a+bit loading and trellis coding

7 doc.: IEEE 802.11-01/232r0 Submission March 2002 Todor Cooklev, AwareSlide 7 Channel characteristics

8 doc.: IEEE 802.11-01/232r0 Submission March 2002 Todor Cooklev, AwareSlide 8 Performance comparison

9 doc.: IEEE 802.11-01/232r0 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.992.1 Requires relatively small standardization effort

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