IEEE 802.15.4 subsystem
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IEEE 802.15.4 subsystem Commit Details
Date: | 2010-09-10 01:38:50 (13 years 6 months ago) |
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Author: | Werner Almesberger |
Commit: | 0a0a50d73d36afb6c40a6d17c2df7a6f9a0fa57a |
Message: | Performance comparison of atusb vs. atusd. - atusd/tests/send-20100909: conducted performance comparison of atusb vs. atusd - atusd/ERRATA: changed also first board to capacitative divider |
Files: |
atusd/ERRATA (1 diff) atusd/tests/send-20100909 (1 diff) |
Change Details
atusd/ERRATA | ||
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25 | 25 | R3 -> 33 pF |
26 | 26 | R4 -> 220 pF |
27 | 27 | |
28 | Applied work-around also to first 20100908 board after confirming dismal | |
29 | performance caused by clock instability. | |
30 | ||
28 | 31 | - considering that the clock input has a Vpp of only 400-500 mV, we should |
29 | 32 | have a ground plane also under as much of the the clock circuit as |
30 | 33 | possible. |
atusd/tests/send-20100909 | ||
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1 | Signal strength tests. "Local" devices are on lab bench, about 5 cm apart. | |
2 | "Distant" device is in the adjacent room, separated by one thin brick wall | |
3 | and 4 m of air. | |
4 | ||
5 | TX is requested 0 dBm (effectively -0.2 dBm). Transmission is without | |
6 | CSMA-CA and ARQ. Results are LQI and ED (dBm). "garbled" is a bad CRC and | |
7 | corrupted frame content. "-" is no reception. | |
8 | ||
9 | Distant Local | |
10 | --------------- --------------- --------------- | |
11 | 100903-red 100903-orange 100908-B | |
12 | ||
13 | TX 255, -90 255, -90 | |
14 | TX 255, -90 garbled | |
15 | TX 255, -90 255, -90 | |
16 | TX 255, -90 255, -90 | |
17 | TX 255, -90 255, -90 | |
18 | ||
19 | - TX garbled | |
20 | garbled TX 255, -52 | |
21 | 255, -89 TX 255, -52 | |
22 | 255, -89 TX 255, -53 | |
23 | - TX 255, -53 | |
24 | ||
25 | 255, -88 255, -48 TX | |
26 | 255, -86 255, -46 TX | |
27 | 255, -86 255, -49 TX | |
28 | 255, -86 255, -49 TX | |
29 | 255, -87 255, -49 TX | |
30 | ||
31 | 100903-red 100903-orange 100908-A | |
32 | ||
33 | TX 255, -90 garbled | |
34 | TX 255, -89 180, -89 | |
35 | TX 255, -87 196, -89 | |
36 | TX 255, -87 148, -89 | |
37 | TX 255, -87 - | |
38 | ||
39 | 255, -86 TX garbled | |
40 | 255, -87 TX 255, -49 | |
41 | 255, -86 TX 255, -49 | |
42 | 255, -87 TX 255, -49 | |
43 | 255, -86 TX 255, -49 | |
44 | ||
45 | - garbled (-44) TX | |
46 | - - TX | |
47 | - - TX | |
48 | - - TX | |
49 | - - TX | |
50 | ||
51 | 100903-red 100903-orange 100908-A (reworked) | |
52 | ||
53 | TX 255, -87 255, -87 | |
54 | TX 255, -87 255, -88 | |
55 | TX 255, -87 255, -87 | |
56 | TX 255, -87 255, -88 | |
57 | TX 255, -87 255, -88 | |
58 | ||
59 | 255, -86 TX 255, -56 | |
60 | 255, -86 TX 255, -57 | |
61 | 255, -86 TX 255, -58 | |
62 | 255, -86 TX 255, -58 | |
63 | 255, -86 TX 255, -58 | |
64 | ||
65 | 255, -85 255, -52 TX | |
66 | 255, -85 255, -52 TX | |
67 | 255, -85 255, -52 TX | |
68 | 255, -86 255, -52 TX | |
69 | 255, -86 255, -52 TX | |
70 | ||
71 | ||
72 | Conclusions | |
73 | ----------- | |
74 | ||
75 | - 20100902 (atusb) and 20100908 (atusd) board show similar performance when | |
76 | at least one station is an atusb | |
77 | ||
78 | - resistive divider doesn't work | |
79 | ||
80 | - no clear indication of whether capacitative divider causes interferences. | |
81 | Marked difference in one series of tests but the others look the same. | |
82 | ||
83 | - reception level is about 4 dB above workable minimum. (Specified receiver | |
84 | sensitivity is -101 dBm, but things start to deteriorate around -90 dBm.) | |
85 | We have a reserve of 3.2 dB for transmission (used -0.2 dBm, maximum is | |
86 | +3.0 dBm). |