Changes between Version 3 and Version 4 of OFDMReferenceDesign/Applications/CSMA
- Timestamp:
- Dec 1, 2009, 1:13:05 PM (14 years ago)
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OFDMReferenceDesign/Applications/CSMA
v3 v4 28 28 ''The values below correspond to OFDM Reference Design v14''[[BR]] 29 29 30 The basic packet exchange which defines the maximum throughput for CSMA is DATA-ACK-DATA. The timing of this exchange i sour implementation is illustrated below. Please note the figure is ''not'' drawn to scale.30 The 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. 31 31 32 32 [[Image(OFDMReferenceDesign/Applications/CSMA/Benchmarks/Files:csma_pktExchangeTiming.png)]] … … 41 41 This 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]. 42 42 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.43 Given 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. 44 44 45 45 == Benchmarks ==