{"id":1482,"date":"2020-06-24T02:29:43","date_gmt":"2020-06-23T18:29:43","guid":{"rendered":"http:\/\/yutingvpn.tw\/wordpress\/?p=1482"},"modified":"2020-07-14T14:21:57","modified_gmt":"2020-07-14T06:21:57","slug":"%e8%a9%95%e5%83%b9%e5%87%bd%e6%95%b8%e7%9a%84%e7%a9%a9%e5%81%a5%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"https:\/\/quantbrains.club\/wordpress\/2020\/06\/24\/%e8%a9%95%e5%83%b9%e5%87%bd%e6%95%b8%e7%9a%84%e7%a9%a9%e5%81%a5%e7%89%b9%e6%80%a7\/","title":{"rendered":"\u8a55\u50f9\u51fd\u6578\u7684\u7a69\u5065\u7279\u6027(Robustness)"},"content":{"rendered":"\n<p>\u4eca\u5929\u4f86\u7a0d\u5fae\u82b1\u9ede\u6642\u9593\u804a\u4e00\u4e0b\u8a55\u50f9\u51fd\u6578\u7684<strong>\u9b6f\u68d2<\/strong>\u7279\u6027\uff08<strong>Robustness\uff0c<\/strong>\u6211\u4e5f\u4e0d\u77e5\u9053\u70ba\u4ec0\u9ebc\u6709\u4eba\u7ffb\u8b6f\u6210\u9b6f\u68d2\u6027\uff0c\u9084\u662f\u53eb\u7a69\u5065\u6027\u6bd4\u8f03\u76f4\u89ba\uff09\uff0c\u76f4\u63a5\u5148\u5f9e\u8a0e\u8ad6\u5340\u88e1\u5e7e\u5e74\u524d\u7684\u820a\u6587\uff08\u600e\u9ebc\u73fe\u5728\u52d5\u4e0d\u52d5\u4e00\u958b\u53e3\u5c31\u662f\u5e7e\u5e74\u524d\uff0c\u771f\u7684\u662f\u8001\u4e86\uff09\u958b\u59cb\u597d\u4e86<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"404\" src=\"http:\/\/yutingvpn.tw\/wordpress\/wp-content\/uploads\/2020\/06\/AA1-1024x404.png\" alt=\"\" class=\"wp-image-1483\" srcset=\"https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA1-1024x404.png 1024w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA1-600x237.png 600w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA1-300x118.png 300w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA1-768x303.png 768w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA1-1536x606.png 1536w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA1.png 1750w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u9762\u6211\u5011\u5c0d\u6240\u8b02\u7684&lt;\u7a69\u5065&gt;\u4e0b\u4e86\u4e00\u500b\u5b9a\u7fa9<\/p>\n\n\n\n<p><strong>\u7a69\u5065\u7684\u5b9a\u7fa9\u662f\uff1a\u5982\u679c\u6211\u5011\u5c0d\u6578\u64da\u7a0d\u505a\u6539\u8b8a\uff0c\u800c\u4e0d\u6703\u986f\u8457\u5f71\u97ff\u9019\u500b\u7d71\u8a08\u6307\u6a19\u7684\u6578\u503c\uff0c\u6211\u5011\u5c31\u7a31\u5176\u70ba\u7a69\u5065\uff08<\/strong><strong>Robust<\/strong><strong>\uff09\u3002<\/strong><\/p>\n\n\n\n<p>\u9019\u5b9a\u7fa9\u5982\u679c\u6211\u6c92\u8a18\u932f\u7684\u8a71\u61c9\u8a72\u5728\u4e0a\u9762\u8b1b\u5230\u7684\u90a3\u672c\u66f8\uff08\u6d77\u9f9c\u6295\u8cc7\u6cd5\u5247\uff09\u88e1\u6703\u6709\u6bd4\u8f03\u8a73\u7d30\u7684\u8aaa\u660e\uff0c\u96d6\u7136\u6211\u5df2\u7d93\u597d\u5e7e\u5e74\u6c92\u7ffb\u4e86\uff0c\u653e\u5230\u54ea\u53bb\u4e86\u5462 XD <\/p>\n\n\n\n<p>\u7a69\u5065\u7684\u5b9a\u7fa9\u4e0d\u7279\u5225\u53ea\u7528\u4f86\u5f62\u5bb9\u8a55\u50f9\u51fd\u6578\uff0c\u4e5f\u53ef\u4ee5\u7528\u4f86\u5f62\u5bb9\u7b56\u7565\u6216\u4efb\u610f\u6642\u9593\u5e8f\u5217\u7684\u8d70\u52e2<\/p>\n\n\n\n<p>\u5728\u6211\u5011\u8a0e\u8ad6\u5340\u88e1\u6709\u5217\u4e86\u4e00\u4e9b\u8a55\u50f9\u51fd\u6578\u6216\u7db2\u8def\u4e0a\u5927\u5bb6\u6bd4\u8f03\u5e38\u770b\u5230\u4e00\u4e9b\u8a55\u50f9\u6307\u6a19\uff0c\u6211\u5011\u5927\u6982\u53ef\u4ee5\u7528\u9019\u500b\u7279\u6027\u505a\u5340\u5206\u7c21\u55ae\u5730\u628a\u4ed6\u5011\u5206\u6210\u5169\u985e\uff08\u597d\u50cf\u662f\u5ee2\u8a71\uff09\uff0c\u4e00\u7a2e\u5c31\u662f\u7a69\u5065\u578b\uff08\u4e00\u822c\u5e38\u898b\u7684\u662f\u7d9c\u5408\u6307\u6a19\u985e\uff0c\u4e5f\u5c31\u662f\u591a\u500b\u6307\u6a19\u6df7\u5728\u4e00\u8d77\u8a55\u50f9\u7684\u7d50\u679c\u3001\u5747\u503c\u985e\u3001\u56de\u6b78\u5206\u6790\u985e\uff09\uff0c\u4e00\u7a2e\u5c31\u662f\u975e\u7a69\u5065\u578b\uff08netprofit\/Kelly\/Optimal-F\/MAR\/CAGR\/Sharpe Ratio\uff09<\/p>\n\n\n\n<p>\u53ea\u8b1b\u5b9a\u7fa9\u6bd4\u8f03\u6a21\u7cca\uff0c\u770b\u5f35\u5716\u5c31\u6bd4\u8f03\u5bb9\u6613\u7406\u89e3\u4e86<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"526\" src=\"http:\/\/yutingvpn.tw\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-1024x526.png\" alt=\"\" class=\"wp-image-1484\" srcset=\"https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-1024x526.png 1024w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-600x308.png 600w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-300x154.png 300w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-768x395.png 768w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-1536x790.png 1536w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA2-2048x1053.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5716\u8868\u7684\u6700\u4e0b\u65b9\u6709\u5169\u689d\u8a55\u50f9\u51fd\u6578\u6307\u6a19\u6240\u7522\u751f\u7684\u6578\u503c\uff0c\u5176\u4e2d\u9ec3\u7dda\u8ddf\u7d05\u7dda\u5728\u8868\u73fe\u4e0a\u5c31\u6709\u975e\u5e38\u660e\u986f\u7684\u5dee\u7570\uff0c\u9ec3\u7dda\uff08Opt-F\uff09\u4ee3\u8868\u7684\u5c31\u662f\u975e\u7a69\u5065\u7684\u72c0\u614b\uff0c\u7d05\u7dda\u5247\u662f\u7a69\u5065\u7684\u72c0\u614b<\/p>\n\n\n\n<p>\u975e\u7a69\u5065\uff08non-robust\uff09\u7684\u72c0\u614b\u975e\u5e38\u5bb9\u6613\u53d7\u5230\u79fb\u52d5\u7a97\u683c\u7684\u8d77\u59cb\u9ede\u8ddf\u7d50\u675f\u9ede\u7522\u751f\u660e\u986f\u7684\u8b8a\u5316\uff08\u4f46\u9084\u662f\u6703\u5728\u4e00\u5b9a\u7684\u7bc4\u570d\u4e4b\u5167\uff09\uff0c\u7a69\u5065\uff08robust\uff09\u7684\u72c0\u614b\u5247\u5448\u73fe\u920d\u5316\u7684\u72c0\u614b\uff08\u5c0d\u7a97\u683c\u7684\u79fb\u52d5\u6216\u640d\u76ca\u7684\u8b8a\u5316\u53cd\u61c9\u4e0d\u660e\u986f\uff09<\/p>\n\n\n\n<p>\u90a3\u6211\u5011\u61c9\u8a72\u9078\u7528\u54ea\u4e00\u7a2e\u8a55\u50f9\u51fd\u6578\u597d\uff0c\u96d6\u7136\u6211\u524d\u9762\u622a\u5716\u5167\u6709\u4e9b\u6b66\u65b7\u5730\u8aaarobust\u6bd4\u8f03\u597d\uff0c\u4f46\u5176\u5be6\u9084\u662f\u6709\u8a0e\u8ad6\u7684\u7a7a\u9593\u3002\u8981\u9078\u64c7\u54ea\u4e00\u7a2e\u597d\uff0c\u5f9e\u7d30\u7bc0\u4e0a\u4f86\u8aaa\u61c9\u8a72\u56de\u5230\u6211\u5011\u4e4b\u524d\u5728\u8a0e\u8ad6\u7684\u95dc\u65bc\u8a55\u50f9\u51fd\u6578\u7684\u8a2d\u8a08\u4f86\u505a\u6c7a\u5b9a\uff0c\u4e5f\u5c31\u662f\u4f60\u60f3\u9078\u64c7\u7684\u662f<strong>\u98a8\u96aa<\/strong>\u9084\u662f<strong>\u5229\u6f64<\/strong>\uff1f<\/p>\n\n\n\n<p>\u8981\u8b1b\u98a8\u96aa\uff08\u96dc\u8a0a\uff09\u8ddf\u5229\u6f64\uff0c\u6211\u5011\u5148\u66ab\u6642\u5f9e\u3000<strong>\u8cc7\u91d1\u7ba1\u7406\u5c64<\/strong>\u3000\u8df3\u5230\u3000<strong>\u7b56\u7565\u5c64<\/strong>\u3000\u9019\u908a\u4f86\u597d\u4e86<\/p>\n\n\n\n<p>\u4e0d\u597d\u7684\u6b0a\u76ca\u66f2\u7dda\u8ddf\u597d\u7684\u6b0a\u76ca\u66f2\u7dda<\/p>\n\n\n\n<p>\uff08\u6216\u61c9\u8a72\u8aaa\u65b0\u624b\u8ddf\u8001\u624b\u7684\u6b0a\u76ca\u66f2\u7dda?\u3000anyway\uff09<\/p>\n\n\n\n<p>\u901a\u5e38\u96a8\u8457\u6211\u5011\u5728\u5e02\u5834\u7684\u6642\u9593\u8d8a\u4e45\uff0c\u6211\u5011\u6703\u958b\u59cb\u5b78\u5230\u8a72\u600e\u9ebc\u8fa8\u5225\u4e0d\u540c\u7684\u6642\u9593\u6216\u662f\u4e0d\u540c\u7684\u72c0\u614b\u4e0b\uff0c\u5e02\u5834\u7684\u98a8\u96aa(<strong>\u566a\u97f3<\/strong>\/\u4e0d\u78ba\u5b9a\u6027)\u6a5f\u7387\u5206\u5e03\u9ad8\u4f4e\u5927\u6982\u662f\u600e\u9ebc\u6a23\uff0c\u7136\u5f8c\u6211\u5011\u6703\u958b\u59cb\u77e5\u9053\u54ea\u4e9b\u8a0a\u865f\u5728\u54ea\u4e9b\u6642\u9593\u6216\u54ea\u4e9b\u72c0\u614b\u8981\u505a\u6216\u4e0d\u8981\u505a\uff08\u6ffe\u93e1\uff09<\/p>\n\n\n\n<p>\u4e0b\u5716\u53ef\u80fd\u5c31\u662f\u6211\u5011\u4e00\u958b\u59cb\u7684\u7b56\u7565\uff08\u65b0\u624b\uff09\uff0c\u7167\u8457\u6307\u6a19\uff08\u5747\u7dda\/RSI\/KD\u2026..etc.\uff09\uff0c\u6bcf\u500b\u8a0a\u865f\u90fd\u505a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"536\" src=\"http:\/\/yutingvpn.tw\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-1024x536.png\" alt=\"\" class=\"wp-image-1485\" srcset=\"https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-1024x536.png 1024w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-600x314.png 600w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-300x157.png 300w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-768x402.png 768w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-1536x804.png 1536w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA3-2048x1072.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u975e\u591a\u5373\u7a7a\uff0c\u53cd\u6b63\u5c31\u6a5f\u68b0\u5f0f\u64cd\u4f5c\uff0c\u8a0a\u865f\u8ddf\u7dca\u5c31\u5c0d\u4e86\uff0c\u9577\u671f\u4f86\u770b\u9084\u662f\u6703\u8cfa\uff0c\u8667\u640d\uff08\u4e0d\u597d\u505a\uff09\u8ddf\u7372\u5229\uff08\u597d\u505a\uff09\u5c31\u662f\u4e00\u500b\u5faa\u74b0\uff0c\u6211\u5011\u6703\u544a\u8a34\u81ea\u5df1\u8ddf\u7dca\u5c31\u5c0d\u4e86\uff0c\u4e00\u5b9a\u8981\u6709\u4fe1\u5fc3\u4fe1\u5fc3\u4fe1\u5fc3\uff0c\u53ea\u8981\u6709\u4fe1\u5fc3\uff0c\u5e02\u5834\u4e0d\u6703\u8667\u5f85\u4f60\u7684\uff0c\u53ea\u8981\u6490\u904e\u53bb\u76e4\u6574\uff0c\u7d42\u7a76\u6703\u518d\u8fce\u4f86\u66d9\u5149<\/p>\n\n\n\n<p>\u96a8\u8457\u6642\u9593\u904e\u53bb\uff0c\u4e00\u6b21\u53c8\u4e00\u6b21\u7684\u78e8\u5408\uff0c\u4e00\u6b21\u53c8\u4e00\u6b21\u7684\u4fe1\u5fc3\u91cd\u5efa\uff0c\u4e00\u6b21\u53c8\u4e00\u6b21\u7684\u89c0\u5bdf\uff0c\u6211\u5011\u958b\u59cb\u6703\u5c0d\u5e02\u5834\u6709\u6bd4\u8f03\u591a\u7684\u4e86\u89e3\uff0c\u5c0d\u9031\u671f\u7684\u638c\u63e1\u3001\u8fa8\u8b58\u98a8\u96aa\uff08\u566a\u97f3\uff09\u7684\u80fd\u529b\u4e5f\u6703\u6162\u6162\u589e\u52a0<\/p>\n\n\n\n<p>\u6211\u5011\u53ef\u80fd\u958b\u59cb\u77e5\u9053\u7b56\u7565\u591a\u7a7a\u4e0d\u8981\u5beb\u5728\u4e00\u8d77\uff0c\u6216\u662f\u4ec0\u9ebc\u6642\u5019\u98a8\u96aa\u6703\u589e\u52a0\uff0c\u54ea\u4e9b\u6a5f\u6703\u5be7\u9858\u653e\u6389\u4e0d\u8981\u505a\uff08\u4e0d\u540c\u6642\u9593\u7684\u98a8\u96aa\u6a5f\u7387\u5206\u5e03\uff0c\u4e0d\u540c\u5340\u57df\u7684\u98a8\u96aa\u6a5f\u7387\u5206\u5e03\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"777\" src=\"http:\/\/yutingvpn.tw\/wordpress\/wp-content\/uploads\/2020\/06\/AA4-1024x777.png\" alt=\"\" class=\"wp-image-1486\" srcset=\"https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA4-1024x777.png 1024w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA4-600x455.png 600w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA4-300x228.png 300w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA4-768x582.png 768w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA4-1536x1165.png 1536w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA4.png 1792w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"715\" src=\"http:\/\/yutingvpn.tw\/wordpress\/wp-content\/uploads\/2020\/06\/AA5-1024x715.png\" alt=\"\" class=\"wp-image-1487\" srcset=\"https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA5-1024x715.png 1024w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA5-600x419.png 600w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA5-300x210.png 300w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA5-768x536.png 768w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA5-1536x1073.png 1536w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA5.png 1767w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"837\" src=\"http:\/\/yutingvpn.tw\/wordpress\/wp-content\/uploads\/2020\/06\/AA6-1024x837.png\" alt=\"\" class=\"wp-image-1488\" srcset=\"https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA6-1024x837.png 1024w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA6-600x490.png 600w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA6-300x245.png 300w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA6-768x628.png 768w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA6-1536x1255.png 1536w, https:\/\/quantbrains.club\/wordpress\/wp-content\/uploads\/2020\/06\/AA6.png 1768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" 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\u4e0d\u4e00\u5b9a\u3002\u9019\u53c8\u56de\u5230\u6211\u5011\u4e4b\u524d\u6240\u8aaa\u7684\uff0c\u8a55\u50f9\u51fd\u6578\u7684\u8a2d\u8a08\u8ddf\u9078\u7528\uff0c\u4e3b\u8981\u662f\u4f9d\u64da<strong>\u4f60\u81ea\u5df1\u7684\u72c0\u614b\u8ddf\u9700\u6c42<\/strong>\u4f86\u9032\u884c\u8a2d\u8a08\u6216\u9078\u7528\uff0c<strong>\u98a8\u96aa\u9084\u662f\u5229\u6f64?<\/strong>\u3002<\/p>\n\n\n\n<p>\u7a69\u5065\u7279\u6027\uff08\u6709\u920d\u5316\u7684\u6027\u8cea\uff09\u6703\u6291\u5236\u77ed\u671f\u5167\u7684\u98a8\u96aa\u4e0a\u5347\uff0c\u76f8\u5c0d\u5730\u4e5f\u6703\u6291\u5236\u4f60\u7684\u6f5b\u5728\uff08\u52a0\u78bc\uff09\u7372\u5229\uff0c\u9019\u53ea\u662f\u4e00\u7a2etradeoff\uff0c\u5982\u679c\u4f60\u7684\u7b56\u7565\u672c\u8eab\u5177\u6709\u975e\u5e38\u826f\u597d\u7684\u6297\u8e81\u80fd\u529b\uff0c\u9078\u7528<strong>\u975e\u7a69\u5065\u6027<\/strong>\u7684\u8a55\u50f9\u51fd\u6578\u53ef\u4ee5\u8b93\u4f60\u5728\u5927\u884c\u60c5\u4e2d\u8fc5\u901f\u53cd\u61c9\uff08\u52a0\u78bc\uff09\uff0c\u4f46\u5c0d\u4e00\u822c\u65b0\u624b\u6216\u5c0d\u65bc\u7b56\u7565\u6297\u566a\u80fd\u529b\u7684\u638c\u63e1\u9084\u4e0d\u662f\u90a3\u9ebc\u597d\uff08\u4e0d\u662f\u90a3\u9ebc\u6f02\u4eae\u7684\u968e\u68af\u72c0\u6b0a\u76ca\u66f2\u7dda\uff09\u7684\u540c\u5b78\uff0c\u6539\u70ba\u9078\u7528<strong>\u7a69\u5065\u7279\u6027<\/strong>\u7684\u8a55\u50f9\u51fd\u6578\u5247\u6bd4\u8f03\u80fd\u907f\u514d\uff08\u6216\u8a31\u7528\u6e1b\u8f15\u9019\u500b\u8a5e\u6bd4\u8f03\u597d\uff0c\u7562\u7adf\u566a\u97f3\u9084\u662f\u6703\u8ddf\u8457\u7b56\u7565\u9032\u4f86\u8cc7\u91d1\u7ba1\u7406\u5c64\uff09\u524d\u9762\u90a3\u500bFAQ\u7684\u72c0\u6cc1\u3002\uff08\u4e0d\u77e5\u9053\u70ba\u4ec0\u9ebc\uff0c\u7a69\u5065\u7279\u6027\u6703\u8b93\u6211\u806f\u60f3\u5230Direct-sequence spread 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