Changes between Version 3 and Version 4 of OFDMReferenceDesign/Applications/CSMA


Ignore:
Timestamp:
Dec 1, 2009, 1:13:05 PM (11 years ago)
Author:
murphpo
Comment:

--

Legend:

Unmodified
Added
Removed
Modified
  • OFDMReferenceDesign/Applications/CSMA

    v3 v4  
    2828''The values below correspond to OFDM Reference Design v14''[[BR]]
    2929
    30 The basic packet exchange which defines the maximum throughput for CSMA is DATA-ACK-DATA. The timing of this exchange is our implementation is illustrated below. Please note the figure is ''not'' drawn to scale.
     30The basic packet exchange which defines the maximum throughput for CSMA is DATA-ACK-DATA. The timing of this exchange in our implementation is illustrated below. Please note the figure is ''not'' drawn to scale.
    3131
    3232[[Image(OFDMReferenceDesign/Applications/CSMA/Benchmarks/Files:csma_pktExchangeTiming.png)]]
     
    4141This figure includes a random backoff period imposed after a node receives an ACK. This period is designed to prevent two fully-backlogged nodes from simultaneously attempting to transmit a new packet immediately after the previous DATA-ACK exchange completes. The backoff imposes a wait of an integral number of slot durations (a slot is 22µs in v14), with the slot count drawn randomly from ![0,7].
    4242
    43 Given this timing, the average minimum period for transmitting a new DATA packet is 1263µs (for QPSK full rate) or 775µs (for 16-QAM full rate), implying a peak data throughput of 9.31Mbps for QPSK and 15.2Mbps for 16-QAM.
     43Given this timing, the average minimum period for transmitting a new full-length DATA packet is 1263µs (for QPSK full rate) or 775µs (for 16-QAM full rate), implying a peak data throughput of 9.31Mbps for QPSK and 15.2Mbps for 16-QAM.
    4444
    4545== Benchmarks ==