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Doc.: IEEE 802.11-98/82a Submission Proposal for High Data Rate 2.4 GHz PHY Variable Rate Binary Convolutional Coding on QPSK Chris Heegard & Matthew B.

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Presentation on theme: "Doc.: IEEE 802.11-98/82a Submission Proposal for High Data Rate 2.4 GHz PHY Variable Rate Binary Convolutional Coding on QPSK Chris Heegard & Matthew B."— Presentation transcript:

1 doc.: IEEE 802.11-98/82a Submission Proposal for High Data Rate 2.4 GHz PHY Variable Rate Binary Convolutional Coding on QPSK Chris Heegard & Matthew B. Shoemake Alantro Communications

2 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 2 Transmitter & Receiver Variable Rate BCC QPSK Modulator RF Upconverter/ Amplifier Data Source MAC Interface RF Pre-Amp/ Down Converter QPSK Demodulaor/Equalizer BCC Decoder Data Sink MAC Interface

3 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 3 Robust Coding 64 state BCC (binary convolutional code) with punctured rate (uncoded) 1, 2, (coded) 2.75, 5.5, 11, 14.3, 16.5, 17.6, 18.3 and 19.25 Mbps primary rate: 11 Mbps with +2dB Es/No over 2Mbps DS- PHY (+500% data) 5.5 Mbps with -1.2dB Es/No over 2Mbps DS-PHY (+275% data) More coding gain can save power at transmitter

4 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 4 Backward Compatibility QPSK modulation Channelization –11 Msps Symbol (Chip) Rate –30 MHz Bandwidth Existing RF, Antenna, MAC Preamble –Existing preamble most compatible, less data/estimation efficient high performance preamble

5 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 5 Complexity Estimates of 76k-95k gates –modest in terms of state-of-the art technology today –estimates based on preliminary HDL design (portable) Power management will reduce average power usage (modules with have sleep mode, CMOS) Technical feasibility demonstrated; at least one vendor has already agreed to deploy the system A low complexity solution that is not robust will hurt the possibility of exciting growth in the WLAN market -we all lose...

6 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 6 BCC’s in Wireless Systems The use of BCC’s in wireless communications is not a new idea BCC’s have been proven effective in wireless systems with multipath, and they have been implemented as commercial products IS-95 standard for digital CDMA cellular phones uses a 256-state BCC GSM standard uses a four state punctured BCC Satellite systems, such as the small disk digital TV systems (e.g., DirectTV & Primestar) always deploy such a BCC In addition, BCC’s have been proposed for the 802.11A (5.0 GHz) systems

7 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 7 Processing Gain

8 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 8 AWGN Performance Detection Complexity

9 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 9 PER versus Trms

10 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 10 PER, 64 Byte Packets, Primary (11Mbps) Rate, Multipath Trms = 25, 50, 100, 150, 200, 250, 350, 450, 550 ns

11 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 11 PER, 1000 Byte Packets, Primary (11Mbps) Rate, Multipath Trms = 25, 50, 100, 150, 200, 250, 350, 450, 550 ns

12 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 12 PER, 64 Byte Packets, Variable Rate, AWGN, Es/No

13 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 13 PER, 64 Byte Packets, Variable Rate, AWGN, Eb/No

14 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 14 PER, 1000 Byte Packets, Variable Rate, AWGN, Es/No

15 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 15 PER, 1000 Byte Packets, Variable Rate, AWGN, Eb/No

16 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 16 Cell Planning 3 1 2 1 3 2 2 1 3 1 2 1 3 2 2 1 3 1 2 1 3 2 2 1 3 1 2 1 3 2 2 1

17 doc.: IEEE 802.11-98/82a Submission March 1998 Chris Heegard & Matthew Shoemake, Alantro CommunicationsSlide 17 Summary 64 state BCC –Coding Gain for Robust Performance –Variable Rate –Reasonable complexity Adaptive Equalizer –Robust multipath tolerance –Combines well with BCC –Reasonable complexity Backward Compatible –Realistic upgrade path –Uses existing RF/Antenna, MAC Ongoing HDL Design

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