Changes between Version 1 and Version 2 of OFDM/MIMO/Docs/Benchmarks

Timestamp:

Dec 3, 2009, 3:25:37 PM (14 years ago)

Author:

murphpo

Comment:

--

OFDM/MIMO/Docs/Benchmarks

@@ -11 +11 @@
 '''Packet Error Rate''': PER is measured by transmitting a known number of packets, then counting how many are received successfully. A packet error occurs either when the receiver fails to detect a packet or receives it with at least one bit error in the header or payload.
 
-[[Image(OFDMReferenceDesign/Files:OFDM_v14_PER.png)]]
+The experimental independent variable is gain of the variable gain amplifier in the MAX2829 transceiver at the transmit node. The Tx power controlled by a 6-bit digital value, which maps control values [0,63] to Tx gains of approximately [-31, 0]dB. We sweep over control values of [17,63] in our tests. The plot uses an x-axis of 'Channel Gain', which is the sum of the reduced Tx power and 80dB external attenuation.
+
+[[Image(OFDM/MIMO/Docs/Benchmarks/v14/Files:OFDM_v14_PER.png)]]
  
+'''Bit Error Rate''': BER is measured by transmitting packets with payloads known to both nodes, then counting how many payload bits are received in error. The PHY records bit errors only when a packet is received with a valid header. Packets which are not detected and packets received with header errors are '''not''' included in the BER calculation. This biases the results, but is the fairest measurement we can take without modifying the PHY to ignore header values (length and modulation rate) for received packets.
+
+The experimental independent variable is the same as for the PER test described above.
+
+[[Image(OFDM/MIMO/Docs/Benchmarks/v14/Files:OFDM_v14_BER.png)]]