IEEE 802.15.4 subsystem
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IEEE 802.15.4 subsystem Git Source Tree
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Source at commit 424ddce9756cb5ead3e86ec27e767b4e25596ed6 created 13 years 4 months ago. By Werner Almesberger, ants/: Passive board for antenna testing. | |
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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 | 100813-red 100813-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 | 100813-red 100813-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 | 100813-red 100813-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 | - 20100813 (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). |
87 |