Index of /data/wichmo/outdoor/navacchio-poligono

[ICO]NameLast modifiedSizeDescription
[PARENTDIR]Parent Directory  -  
[DIR]aggregated/2006-10-06 17:04 -  
[ ]rcv_01M_330m_0500B2008-02-15 10:45 6.9M 
[ ]rcv_01M_330m_1000B2008-02-15 10:45 7.1M 
[ ]rcv_01M_330m_1500B2008-02-15 10:45 3.5M 
[ ]rcv_01M_370m_0500B2008-02-15 10:45 3.4M 
[ ]rcv_01M_370m_1000B2008-02-15 10:45 3.4M 
[ ]rcv_01M_370m_1500B2008-02-15 10:45 3.4M 
[ ]rcv_01M_390m_0500B2008-02-15 10:45 2.9M 
[ ]rcv_01M_390m_1000B2008-02-15 10:45 2.6M 
[ ]rcv_02M_270m_0500B2008-02-15 10:45 6.9M 
[ ]rcv_02M_270m_1000B2008-02-15 10:45 7.1M 
[ ]rcv_02M_270m_1500B2008-02-15 10:45 7.1M 
[ ]rcv_02M_310m_0500B2008-02-15 10:45 6.9M 
[ ]rcv_02M_310m_1000B2008-02-15 10:45 7.1M 
[ ]rcv_02M_310m_1500B2008-02-15 10:45 7.0M 
[ ]rcv_02M_330m_0500B2008-02-15 10:45 6.7M 
[ ]rcv_02M_330m_1000B2008-02-15 10:45 6.3M 
[ ]rcv_02M_330m_1500B2008-02-15 10:45 5.9M 
[ ]rcv_05M_230m_0500B2008-02-15 10:45 7.1M 
[ ]rcv_05M_230m_1000B2008-02-15 10:45 7.3M 
[ ]rcv_05M_230m_1500B2008-02-15 10:45 7.3M 
[ ]rcv_05M_270m_0500B2008-02-15 10:45 6.6M 
[ ]rcv_05M_270m_1000B2008-02-15 10:45 6.4M 
[ ]rcv_05M_270m_1500B2008-02-15 10:45 6.2M 
[ ]rcv_05M_310m_0500B2008-02-15 10:45 6.4M 
[ ]rcv_05M_310m_1000B2008-02-15 10:45 6.0M 
[ ]rcv_05M_310m_1500B2008-02-15 10:45 5.7M 
[ ]rcv_11M_170m_0500B2008-02-15 10:45 7.1M 
[ ]rcv_11M_170m_1500B2008-02-15 10:45 7.3M 
[ ]rcv_11M_180m_0500B2008-02-15 10:45 6.9M 
[ ]rcv_11M_180m_1000B2008-02-15 10:45 6.9M 
[ ]rcv_11M_180m_1500B2008-02-15 10:45 6.7M 
[ ]rcv_11M_190m_0500B2008-02-15 10:45 6.4M 
[ ]rcv_11M_190m_1000B2008-02-15 10:45 6.1M 
[ ]rcv_11M_190m_1500B2008-02-15 10:45 5.9M 
[ ]rcv_11M_230m_0500B2008-02-15 10:45 5.8M 
[ ]rcv_11M_230m_1000B2008-02-15 10:45 5.8M 
[ ]rcv_11M_230m_1500B2008-02-15 10:45 5.9M 
These are the data measured in Navacchio (Pisa) in April, 2006 using two
laptops in 802.11 ad hoc mode at different distance on a wide
uncultivated field.  The laptops are two IBM Thinkpad R40e laptops
(Celeron 2 GHz with 256 MB ram running Debian Linux with a 2.6.8
kernel), equipped with CNet CNWLC-811 wireless cards and standard
drivers.

Retransmission, RTS/CTS and fragmentation are all disabled, long
preambles are used.  Frames are sent to the network card with a 5ms
intertransmission time for 11, 5.5 and 2Mb/s speeds, 10ms for the 1Mb/s
speed.  Notice that frames with data length 1500B are longer than 5ms at
2Mb/s and longer than 10ms at 1MB/s: in these cases the network card
transmits the packets back-to-, so be sure to check the transmission
times.  The beacon is sent every 102.4ms.

Each file name is built like this: rcv_SPEED_DISTANCE_LENGTH

where SPEED is the transmission speed (1, 2, 5.5, 11 Mb/s),
DISTANCE is the distance between the transmitter and the receiver
and LENGTH is the frame length (500, 1000, 1500 bytes).

The fields marked with an asterisk (*) below are always 0, because the
network card used for the measurements in this directory cannot give
these statistics.

FORMAT OF THE DATA

Each line contains these fields:
 - receive time, or 0 when packet is not received at all
 - lenght of the frame in bytes to data: to obtain the whole frame
   lenght one must add an LLC/SNAP header, CRC and MAC header. There are
   three data lengths: 500, 1000 and 1500 bytes.  The respective frame
   durations can be computed as:
		+-------+-------+-------+-------+-------+
		|len[ms]| 1 Mb/s| 2 Mb/s|5.5Mb/s|11 Mb/s|
		+-------+-------+-------+-------+-------+
		| 500 B | 5.154 | 2.954 | 1.555 | 1.154 |
		+-------+-------+-------+-------+-------+
		|1000 B | 9.154 | 4.954 | 2.282 | 1.518 |
		+-------+-------+-------+-------+-------+
		|1500 B |13.154 | 6.954 | 3.009 | 1.881 |
		+-------+-------+-------+-------+-------+
 - sequence number starting from 0
*- quality level read from the network card
 - signal level read from the network card: multiply by 0.6 to get dB
*- noise level read from the network card
 - status: 1 for lost frames, 0 for received frames
*- number of corrupted bits in frames received with wrong CRC