3.BLE---信道与功率

1.频段

• 它是一个无需授权的频段
• 它是唯一一个在任何国家都通用的频段，即对于 2.4GHz 的频

段，从 2400MHz~2483.5MHz 约 83.5MHz 的频谱资源在任何地

方都可以使用。

• BLE的物理信道一共40个
• BLE的这40个物理信道是分成了两组的，一组是Advertising信道（3个），一组是Data信道（37个）

2.频段计算公式

表达式中 f 是无线信道 K 的中心频率。 也意味着最小频率是

2402MHz，最大频率是 2480MHz。

3.发射功率

• 也就是最小发送功率不能低于-20dBm 即 10uW，最大的发送功率不能高于+10dBm 即 10mW。

3.dbm与功率的换算

计算公式为：dBm=10log（功率值/1mw）

wW=power(10,dBm/10)

W=(power(10,dBm/10))/1000

换算表

dBm	mw		dBm	mw		dBm	W		dBm	W
-100	0.0000000001000000		-50	0.0000100000000000		0	0.001		50	100.000
-99	0.0000000001258925		-49	0.0000125892541179		1	0.001		51	125.893
-98	0.0000000001584893		-48	0.0000158489319246		2	0.002		52	158.489
-97	0.0000000001995262		-47	0.0000199526231497		3	0.002		53	199.526
-96	0.0000000002511886		-46	0.0000251188643151		4	0.003		54	251.189
-95	0.0000000003162278		-45	0.0000316227766017		5	0.003		55	316.228
-94	0.0000000003981072		-44	0.0000398107170553		6	0.004		56	398.107
-93	0.0000000005011872		-43	0.0000501187233627		7	0.005		57	501.187
-92	0.0000000006309573		-42	0.0000630957344480		8	0.006		58	630.957
-91	0.0000000007943282		-41	0.0000794328234724		9	0.008		59	794.328
-90	0.0000000010000000		-40	0.0001000000000000		10	0.010		60	1000.000
-89	0.0000000012589254		-39	0.0001258925411794		11	0.013		61	1258.925
-88	0.0000000015848932		-38	0.0001584893192461		12	0.016		62	1584.893
-87	0.0000000019952623		-37	0.0001995262314969		13	0.020		63	1995.262
-86	0.0000000025118864		-36	0.0002511886431510		14	0.025		64	2511.886
-85	0.0000000031622777		-35	0.0003162277660168		15	0.032		65	3162.278
-84	0.0000000039810717		-34	0.0003981071705535		16	0.040		66	3981.072
-83	0.0000000050118723		-33	0.0005011872336273		17	0.050		67	5011.872
-82	0.0000000063095734		-32	0.0006309573444802		18	0.063		68	6309.573
-81	0.0000000079432823		-31	0.0007943282347243		19	0.079		69	7943.282
-80	0.0000000100000000		-30	0.0010000000000000		20	0.100		70	10000.000
-79	0.0000000125892541		-29	0.0012589254117942		21	0.126		71	12589.254
-78	0.0000000158489319		-28	0.0015848931924611		22	0.158		72	15848.932
-77	0.0000000199526231		-27	0.0019952623149689		23	0.200		73	19952.623
-76	0.0000000251188643		-26	0.0025118864315096		24	0.251		74	25118.864
-75	0.0000000316227766		-25	0.0031622776601684		25	0.316		75	31622.777
-74	0.0000000398107171		-24	0.0039810717055350		26	0.398		76	39810.717
-73	0.0000000501187234		-23	0.0050118723362727		27	0.501		77	50118.723
-72	0.0000000630957344		-22	0.0063095734448019		28	0.631		78	63095.734
-71	0.0000000794328235		-21	0.0079432823472428		29	0.794		79	79432.823
-70	0.0000001000000000		-20	0.0100000000000000		30	1.000		80	100000.000
-69	0.0000001258925412		-19	0.0125892541179417		31	1.259		81	125892.541
-68	0.0000001584893192		-18	0.0158489319246111		32	1.585		82	158489.319
-67	0.0000001995262315		-17	0.0199526231496888		33	1.995		83	199526.231
-66	0.0000002511886432		-16	0.0251188643150958		34	2.512		84	251188.643
-65	0.0000003162277660		-15	0.0316227766016838		35	3.162		85	316227.766
-64	0.0000003981071706		-14	0.0398107170553497		36	3.981		86	398107.171
-63	0.0000005011872336		-13	0.0501187233627272		37	5.012		87	501187.234
-62	0.0000006309573445		-12	0.0630957344480193		38	6.310		88	630957.344
-61	0.0000007943282347		-11	0.0794328234724281		39	7.943		89	794328.235
-60	0.0000010000000000		-10	0.1000000000000000		40	10.000		90	1000000.000
-59	0.0000012589254118		-9	0.1258925411794170		41	12.589		91	1258925.412
-58	0.0000015848931925		-8	0.1584893192461110		42	15.849		92	1584893.192
-57	0.0000019952623150		-7	0.1995262314968880		43	19.953		93	1995262.315
-56	0.0000025118864315		-6	0.2511886431509580		44	25.119		94	2511886.432
-55	0.0000031622776602		-5	0.3162277660168380		45	31.623		95	3162277.660
-54	0.0000039810717055		-4	0.3981071705534970		46	39.811		96	3981071.706
-53	0.0000050118723363		-3	0.5011872336272720		47	50.119		97	5011872.336
-52	0.0000063095734448		-2	0.6309573444801930		48	63.096		98	6309573.445
-51	0.0000079432823472		-1	0.7943282347242810		49	79.433		99	7943282.347

dBm->功率的换算

mw	dBm		mw	dBm		W	dBm		W	dBm
1	0.00		51	17.08		0.1	20.00		42	46.23
2	3.01		52	17.16		0.2	23.01		43	46.33
3	4.77		53	17.24		0.3	24.77		44	46.43
4	6.02		54	17.32		0.4	26.02		45	46.53
5	6.99		55	17.40		0.5	26.99		46	46.63
6	7.78		56	17.48		0.6	27.78		47	46.72
7	8.45		57	17.56		0.7	28.45		48	46.81
8	9.03		58	17.63		0.8	29.03		49	46.90
9	9.54		59	17.71		0.9	29.54		50	46.99
10	10.00		60	17.78		1	30.00		51	47.08
11	10.41		61	17.85		2	33.01		52	47.16
12	10.79		62	17.92		3	34.77		53	47.24
13	11.14		63	17.99		4	36.02		54	47.32
14	11.46		64	18.06		5	36.99		55	47.40
15	11.76		65	18.13		6	37.78		56	47.48
16	12.04		66	18.20		7	38.45		57	47.56
17	12.30		67	18.26		8	39.03		58	47.63
18	12.55		68	18.33		9	39.54		59	47.71
19	12.79		69	18.39		10	40.00		60	47.78
20	13.01		70	18.45		11	40.41		61	47.85
21	13.22		71	18.51		12	40.79		62	47.92
22	13.42		72	18.57		13	41.14		63	47.99
23	13.62		73	18.63		14	41.46		64	48.06
24	13.80		74	18.69		15	41.76		65	48.13
25	13.98		75	18.75		16	42.04		66	48.20
26	14.15		76	18.81		17	42.30		67	48.26
27	14.31		77	18.86		18	42.55		68	48.33
28	14.47		78	18.92		19	42.79		69	48.39
29	14.62		79	18.98		20	43.01		70	48.45
30	14.77		80	19.03		21	43.22		71	48.51
31	14.91		81	19.08		22	43.42		72	48.57
32	15.05		82	19.14		23	43.62		73	48.63
33	15.19		83	19.19		24	43.80		74	48.69
34	15.31		84	19.24		25	43.98		75	48.75
35	15.44		85	19.29		26	44.15		76	48.81
36	15.56		86	19.34		27	44.31		77	48.86
37	15.68		87	19.40		28	44.47		78	48.92
38	15.80		88	19.44		29	44.62		79	48.98
39	15.91		89	19.49		30	44.77		80	49.03
40	16.02		90	19.54		31	44.91		81	49.08
41	16.13		91	19.59		32	45.05		82	49.14
42	16.23		92	19.64		33	45.19		83	49.19
43	16.33		93	19.68		34	45.31		84	49.24
44	16.43		94	19.73		35	45.44		85	49.29
45	16.53		95	19.78		36	45.56		86	49.34
46	16.63		96	19.82		37	45.68		87	49.40
47	16.72		97	19.87		38	45.80		88	49.44
48	16.81		98	19.91		39	45.91		89	49.49
49	16.90		99	19.96		40	46.02		90	49.54
50	16.99		100	20.00		41	46.13		91	49.59