Changes between Initial Version and Version 1 of OFDMReferenceDesign/Applications/CSMA/Benchmarks/v14

Timestamp:

Nov 30, 2009, 9:44:10 PM (14 years ago)

Author:

murphpo

Comment:

--

OFDMReferenceDesign/Applications/CSMA/Benchmarks/v14

@@ +1 @@
+= OFDM Reference Design v14 - CSMA Benchmarks =
+
+
+== Timing ==
+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.
+
+[[Image(.)]]
+
+This figure assumes the following parameters:
+ * SISO antenna configuration
+ * 2 OFDM symbols for channel training per packet
+ * 24 byte MAC header at QPSK (2 OFDM symbols)
+ * Full rate modulation of QPSK (12 bytes per OFDM symbol) or 16-QAM (24 bytes per OFDM symbol)
+ * 1484 byte payloads (1470 byte IP datagram + 14 byte Ethernet header)
+
+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].
+
+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.
+
+== Performance Tests ==
+
+=== Peak Throughput ===
+
+'''Methodology''': two WARP Kits (SISO Kit v1), with radios connected via a cable and 60dB attenuation, FPGA boards each connected via Ethernet to a MacBook laptop. One MacBook runs an iperf server, the other runs the iperf client, using one of the following calls:
+{{{
+#!sh
+#For UDP tests:
+iperf -c 10.0.0.1 -u -b 20M -l 1470 -t 30
+
+#For TCP tests:
+iperf -c 10.0.0.1 -l 1470 -t 30
+}}}
+
+'''Results:'''
+|| Full Rate || TCP || UDP ||
+|| QPSK || XX || XX ||
+|| 16-QAM || XX || XX ||
+
+== Packet Error Rate ==
+
+== Bit Error Rate ==