{"id":777,"date":"2019-09-24T12:25:40","date_gmt":"2019-09-24T04:25:40","guid":{"rendered":"http:\/\/149.129.74.185\/?p=777"},"modified":"2019-09-25T13:32:54","modified_gmt":"2019-09-25T05:32:54","slug":"%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%bd%91%e7%bb%9cweek-3-note","status":"publish","type":"post","link":"http:\/\/www.magicmipamipa.com\/?p=777","title":{"rendered":"[\u8ba1\u7b97\u673a\u7f51\u7edc]Week 3 Note"},"content":{"rendered":"

\u7269\u7406\u5c42\u00a0<\/strong><\/h2>\n

1.The Theoretical Basis for Data Communication\u7406\u8bba\u57fa\u7840<\/p>\n

1.1Fourier Analysis \u5085\u91cc\u53f6\u5206\u6790<\/p>\n

\u8fde\u7eed\u53d8\u5316\u7684\u4fe1\u53f7\uff1a\u6a21\u62df\u4fe1\u53f7<\/p>\n

\u7535\u8def\u4ea4\u6362\uff08\u5b58\u5728\u4e00\u6761\u7269\u7406\u7684\u7ebf\uff09<\/p>\n

\u5085\u7acb\u53f6\u53d8\u6362\u5f97\u5230\u4e00\u4e9b\u91c7\u6837\u70b9\uff0c\u8fdb\u884c\u4fe1\u53f7\u7684\u538b\u7f29\u548c\u8fd8\u539f\u3002\u4fdd\u8bc1\u53d6\u6837\u70b9\u7684\u6570\u503c\u53ef\u6570\u6709\u9650\uff0c\u4fdd\u7559\u6574\u6570\u4e0d\u8ba1\u5c0f\u6570\u3002<\/p>\n

1.2Bandwidth-Limited Signals \u5e26\u5bbd\u6709\u9650\u7684\u4fe1\u53f7<\/p>\n

\u5e26\u5bbd\u8868\u793a\u4e00\u4e2a\u4fe1\u9053\u7684\u6700\u5927\u6570\u636e\u901f\u7387\uff0c\u4ee5\u6bcf\u79d2\u591a\u5c11\u4e2a\u6bd4\u7279\uff08bps\uff09\u6765\u8ba1\u91cf\u3002<\/p>\n

IP\u901a\u8baf\u516c\u5171\u4fe1\u9053\uff0c\u79fb\u52a8\u901a\u8baf\u4e13\u7528\u4fe1\u9053\u3002\uff08\u66f4\u9ad8\u8d28\u91cf\u4fdd\u969c\uff09<\/p>\n

\u7531\u4e8e\u6570\u5b57\u4fe1\u53f7\u7684\u4f20\u8f93\u662f\u901a\u8fc7\u6a21\u62df\u4fe1\u53f7\u7684\u8c03\u5236\u5b8c\u6210\u7684\uff0c\u4e3a\u4e86\u4e0e\u6a21\u62df\u5e26\u5bbd\u8fdb\u884c\u533a\u5206\uff0c<\/span>\u6570\u5b57\u4fe1\u9053\u7684\u5e26\u5bbd\u4e00\u822c\u76f4\u63a5\u7528<\/span>\u6ce2\u7279\u7387\u6216<\/span>\u7b26\u53f7\u7387\u6765\u63cf\u8ff0\u3002<\/span><\/p>\n

1.3Maximum Data Rate of a Channel \u4fe1\u9053\u7684\u6700\u5927\u6570\u636e\u901f\u7387<\/p>\n

a. Maximum signal rate for a channel(No Noise)<\/p>\n

-Nyquist Theorem(AT&T\u5de5\u7a0b\u5e08) : Bandwidth = W, Signal rate <= 2W(baud\u6ce2\u7279)<\/p>\n

\u6ca1\u6709\u5e72\u6270\u7684\u60c5\u51b5\u4e0b\uff0c\u4fe1\u53f7\u4f20\u8f93\u901f\u7387\u4e0d\u4f1a\u8d85\u8fc72\u5e26\u5bbd\u7684\u901f\u7387\u3002\u5f97\u5230\u6700\u5927\u4fe1\u53f7\u4f20\u8f93\u7387<\/span><\/strong>\uff1a<\/p>\n

b.Bilevel Encoding: Data rate = 2*Bandwidth(bps)<\/p>\n

c.Multilevel(M<\/span>) Encoding: \u591a\u8fdb\u5236\u7f16\u7801\u6765\u63d0\u9ad8\u4fe1\u53f7\u4f20\u8f93\u7387<\/p>\n

Data rate = 2*Bandwidth*log2M<\/span>(bps)<\/p>\n

– <\/span>\u6700\u5927\u6570\u636e\u4f20\u8f93\u7387<\/span><\/strong>\u00a0Shannom’s Theorem<\/p>\n

Bandwidth = H(HZ), Signal-to-noise ratio = S\/N \u4fe1\u566a\u6bd4<\/p>\n

Maximum Data Rate = H log2(1+S\/N)(bps)<\/p>\n

Decibels(dB):10log10(S\/N)<\/p>\n

\u91cf\u5b50\u901a\u4fe1\u3001\u5149\u901a\u4fe1\uff08\u5149\u8c31\uff09\u3001\u7535\u78c1\u4fe1\u53f7\uff08\u7535\u6d41\u5f3a\u5f31\u3001\u7535\u538b\u5f3a\u5f31\uff09\uff0c\u7b5b\u9009\u6709\u89c4\u5f8b\u7684\u4fe1\u53f7\u3002<\/p>\n

*\u627e\u5916\u661f\u4eba\u7684\u65b9\u5f0f\uff1f<\/p>\n

2.\u4f20\u8f93\u4ecb\u8d28<\/p>\n

Twisted Pair \u53cc\u7ede\u7ebf<\/p>\n

\u76f4\u8fde\u7ebf\u3001\u4ea4\u53c9\u7ebf<\/p>\n

UTP \u975e\u5c4f\u853d\u53cc\u7ede\u7ebf<\/p>\n

Coaxial Cable \u540c\u8f74\u7535\u7f06<\/p>\n

\u4e00\u822c\u662f\u7531\u56db\u5c42\u7269\u6599\u9020\u6210\uff1a\u6700\u5185\u91cc\u662f\u4e00\u6761\u5bfc\u7535\u94dc\u7ebf\uff0c\u7ebf\u7684\u5916\u9762\u6709\u4e00\u5c42\u5851\u80f6\uff08\u4f5c<\/span>\u7edd\u7f18\u4f53\u3001\u7535\u4ecb\u8d28\u4e4b\u7528\uff09\u56f4\u62e2\uff0c\u7edd\u7f18\u4f53\u5916\u9762\u53c8\u6709\u4e00\u5c42\u8584\u7684\u7f51\u72b6\u5bfc\u7535\u4f53\uff08\u4e00\u822c\u4e3a\u94dc\u6216\u5408\u91d1\uff09\uff0c\u7136\u540e\u5bfc\u7535\u4f53\u5916\u9762\u662f\u6700\u5916\u5c42\u7684\u7edd\u7f18\u7269\u6599\u4f5c\u4e3a\u5916\u76ae\u3002<\/span><\/p>\n

Power Lines \u7535\u529b\u7f51<\/p>\n

Fiber Optics \u5149\u7ea4<\/p>\n

\u8fd0\u7528\u5149\u7684\u5168\u53cd\u5c04\u539f\u7406<\/p>\n

\u5149\u6e90\uff1aLED\u3001\u6fc0\u5149\uff08\u957f\u8ddd\u79bb\u4f20\u8f93\uff09<\/p>\n

 <\/p>\n

3.Wireless<\/p>\n

Very\u3001Ultra\u3001Super\u3001Tremendously\u3001Extremely<\/p>\n

Radio Transmission<\/p>\n

\u901a\u8fc7\u5927\u6c14\u7684\u7535\u79bb\u5c42\u53cd\u5c04<\/p>\n

MicroWave Transmission<\/p>\n

\u5fae\u6ce2\u7a7f\u900f\u6027\u5f3a\uff0c\u4e0d\u4f1a\u88ab\u53cd\u5c04\uff0c\u91c7\u7528\u536b\u661f\u8f6c\u53d1\u3002<\/p>\n

Lightwave \u5149\u6ce2<\/p>\n

4.Communication satellite’s properties<\/p>\n

\n

\u56fd\u5185\u5bfc\u822a\u662fGPS\u5168\u7403\u536b\u661f\u5b9a\u4f4d\u7cfb\u7edf<\/b>\uff0c\u662f\u7f8e\u56fd\u56fd\u9632\u90e8\u7814\u5236\u548c\u7ef4\u62a4\u7684\u4e2d\u8ddd\u79bb\u5706\u578b\u8f68\u9053\u536b\u661f\u5bfc\u822a\u7cfb\u7edf\u3002\u5b83\u53ef\u4ee5\u4e3a\u5730\u7403\u8868\u9762\u7edd\u5927\u90e8\u5206\u5730\u533a\uff0898%\uff09\u63d0\u4f9b\u51c6\u786e\u7684\u5b9a\u4f4d\u3001\u6d4b\u901f\u548c\u9ad8\u7cbe\u5ea6\u7684\u6807\u51c6\u65f6\u95f4\u3002\u5168\u7403\u5b9a\u4f4d\u7cfb\u7edf\u53ef\u6ee1\u8db3\u4f4d\u4e8e\u5168\u7403\u5730\u9762\u4efb\u4f55\u4e00\u5904\u6216\u8fd1\u5730\u7a7a\u95f4\u7684\u519b\u4e8b\u7528\u6237\u8fde\u7eed\u4e14\u7cbe\u786e\u5730\u786e\u5b9a\u4e09\u7ef4\u4f4d\u7f6e\u3001\u4e09\u7ef4\u8fd0\u52a8\u548c\u65f6\u95f4\u7684\u9700\u6c42\u3002\u8be5\u7cfb\u7edf\u5305\u62ec\u592a\u7a7a\u4e2d\u768431\u9897GPS\u4eba\u9020\u536b\u661f\uff1b\u5730\u9762\u4e0a1\u4e2a\u4e3b\u63a7\u7ad9\u30013\u4e2a\u6570\u636e\u6ce8\u5165\u7ad9\u548c5\u4e2a\u76d1\u6d4b\u7ad9\uff0c\u53ca\u4f5c\u4e3a\u7528\u6237\u7aef\u7684GPS\u63a5\u6536\u673a\u3002\u6700\u5c11\u53ea\u9700\u5176\u4e2d3\u9897\u536b\u661f\uff0c\u5c31\u80fd\u8fc5\u901f\u786e\u5b9a\u7528\u6237\u7aef\u5728\u5730\u7403\u4e0a\u6240\u5904\u7684\u4f4d\u7f6e\u53ca\u6d77\u62d4\u9ad8\u5ea6\uff1b\u6240\u80fd\u63a5\u6536\u5230\u7684\u536b\u661f\u8baf\u53f7\u6570\u8d8a\u591a\uff0c\u89e3\u7801\u51fa\u6765\u7684\u4f4d\u7f6e\u5c31\u8d8a\u7cbe\u786e\u3002 <\/span><\/p>\n<\/blockquote>\n

 <\/p>\n

\u00a0<\/span>Geostationary Satellites<\/p>\n

VSATs using a hub<\/p>\n

\n

\u751a\u5c0f\u5b54\u5f84\u7ec8\u7aef<\/b>\uff08V<\/b>ery\u00a0S<\/b>mall\u00a0A<\/b>perture\u00a0T<\/b>erminal\uff0cVSAT\uff09\u662f\u6307\u5929\u7ebf\u53e3\u5f84\u4e3a3\u7c73\u4ee5\u4e0b\u7684\u5c0f\u578b\u5730\u7403\u7ad9\u3002\u5e38\u89c1\u7684VSAT\u5929\u7ebf\u53e3\u5f84\u4e3a1.2\u7c73\uff0c\u7531\u789f\u578b\u5929\u7ebf\u3001\u7528\u6237\u7535\u8111\u548c\u4f5c\u754c\u9762\u7684\u5ba4\u5185\u5355\u5143\u7ec4\u6210\u3002\u6700\u9ad8\u4e0b\u884c\u6570\u636e\u7387\u53ef\u8fbe16Mbit\/s\uff0c\u4e0eADSL\u76f8\u82e5\u3002VSAT\u7ec8\u7aef\u4ee5\u5730\u7403\u540c\u6b65\u536b\u661f\u8fde\u63a5\u5176\u4ed6\u7ec8\u7aef\uff08\u7f51\u72b6\u7f51\u7edc\uff09\u6216\u4e00\u4e2a\u4f5c\u4e3a\u96c6\u7ebf\u5668\u7684\u4e3b\u5730\u7403\u7ad9\uff08\u661f\u578b\u7f51\uff09\uff0c\u4ee5\u4f20\u8f93\u5bbd\u9891\u8baf\u53f7\uff0c\u63d0\u4f9b\u4e92\u8054\u7f51\u5b58\u53d6\u3001VOIP\u3001\u5f71\u50cf\u7b49\u670d\u52a1\u3002VSAT\u53ef\u7528\u4ee5\u63d0\u4f9b<\/span>\u5bbd\u5e26\u4e0a\u7f51\u7684\u670d\u52a1\u3002VSAT\u6280\u672f\u7684\u4f18\u70b9\u662f\u5bb9\u6613\u914d\u7f6e\uff0c\u53ea\u8981\u5728\u536b\u661f\u8baf\u53f7\u7684\u8986\u76d6\u533a\u4e4b\u5185\uff0c\u4e0e\u536b\u661f\u4fdd\u6301\u76f4\u89c6\u7ebf\uff08Line of sight\uff09\uff0c\u5c31\u53ef\u4ee5\u57282\u5c0f\u65f6\u4e4b\u5185\u5efa\u7acb\u901a\u8baf\u8fde\u7ebf\u3002\u53ea\u9700\u8981\u5c06<\/span>\u789f\u578b\u5929\u7ebf\u9762\u5411\u536b\u661f\uff0c\u542f\u52a8\u5185\u5efa\u6570\u636e\u673a\uff0c\u5c31\u53ef\u4ee5\u5982<\/span>\u5149\u7ea4\u6216<\/span>DSL\u4e00\u6837\u7684\u8fde\u7ebf\u3002<\/span><\/span><\/p>\n<\/blockquote>\n

Low-Earth Orbit Satellites<\/p>\n

\u79fb\u52a8\u901a\u8baf\u7684\u8fc5\u731b\u53d1\u5c55\u53ca\u4f4e\u6210\u672c\u3001\u9ad8\u9700\u6c42\u4f7f\u5f97\u8fd9\u4e2a\u8ba1\u5212\u7834\u4ea7\u4e86<\/p>\n

5. Digital modulation\u6570\u5b57\u8c03\u5236<\/p>\n

Data and Signal<\/p>\n

Modem<\/p>\n

Baseband Transmission<\/p>\n

\u66fc\u5f7b\u65af\u7279\u7f16\u7801 \u589e\u52a0\u4e00\u4f4d<\/p>\n

4B\/5B\u7f16\u7801 \u589e\u52a025%<\/p>\n

Passband Transmission<\/p>\n

CDMA \u7801\u5206\u590d\u7528<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

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