Changes between Version 22 and Version 23 of 802.11/PHY


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Timestamp:
Jan 15, 2018, 2:15:06 PM (7 years ago)
Author:
murphpo
Comment:

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  • 802.11/PHY

    v22 v23  
    77= 802.11 Reference Design: PHY =
    88
    9 The [wiki:../ Mango 802.11 Reference Design] implements a complete, real-time PHY transceiver in FPGA fabric. Our physical layer implementation is based on the OFDM PHY specified in sections 18 and 20 of of the 802.11-2012 standard. This PHY is commonly referred to as "802.11a/n" (at 5GHz) and "802.11g/n" (at 2.4GHz). The PHY adopts the 11a/g/n standard as defaults for its many parameters (subcarrier allocations, preamble structure, etc.). Many of these parameters can be customized with minor changes to the PHY core initialization scripts.
     9The [wiki:../ Mango 802.11 Reference Design] implements a complete, real-time PHY transceiver in FPGA fabric. Our physical layer implementation is based on the OFDM PHY specified in sections 17 and 19 of of the 802.11-2016 standard. This PHY is commonly referred to as "802.11a/n" (at 5GHz) and "802.11g/n" (at 2.4GHz). The PHY adopts the 11a/g/n standard as defaults for its many parameters (subcarrier allocations, preamble structure, etc.). Many of these parameters can be customized with minor changes to the PHY core initialization scripts.
    1010
    1111The PHY FPGA cores are implemented as Xilinx System Generator models. The source models are available in the repository: [browser:/ReferenceDesigns/w3_802.11/sysgen /ReferenceDesigns/w3_802.11/sysgen].
    … …  
    104104
    105105=== DSSS ===
    106 The PHY receiver also implements the 1Mbps DSSS rate specified in the original 802.11 standard (section 16.2 of the 802.11-2012 standard). This receiver allows reception of management frames transmitted by 802.11 devices at 1Mbps. These transmissions are common in deployments of 802.11 hardware at 2.4GHz. For example, Beacon and Probe Request frames are frequently transmitted at 1Mbps by commercial devices. The basic STA/AP association handshake requires reception of these frames. The 802.11 Reference Design does not implement a DSSS transmitter, as modern 802.11 devices are able to receive management frames at higher rates (including 6Mbps, the lowest OFDM rate, which is commonly used for management frames at 5GHz).
     106The PHY receiver also implements the 1Mbps and 2Mbps DSSS rates specified in the 802.11 standard (section 15 of the 802.11-2016 standard). This receiver allows reception of management frames transmitted by 802.11 devices at 1Mbps. These transmissions are common in deployments of 802.11 hardware at 2.4GHz. For example, Beacon and Probe Request frames are frequently transmitted at 1Mbps by commercial devices. The basic STA/AP association handshake requires reception of these frames. The 802.11 Reference Design does not implement a DSSS transmitter, as modern 802.11 devices are able to receive management frames at higher rates (including 6Mbps, the lowest OFDM rate, which is commonly used for management frames at 5GHz).
    107107
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