{"id":90973,"date":"2024-04-10T11:14:05","date_gmt":"2024-04-10T03:14:05","guid":{"rendered":"https:\/\/www.techphant.cn\/?p=90973"},"modified":"2024-04-10T11:14:11","modified_gmt":"2024-04-10T03:14:11","slug":"zjpffyjsyl-2","status":"publish","type":"post","link":"https:\/\/www.techphant.cn\/blog\/90973.html","title":{"rendered":"\u6b63\u4ea4\u9891\u5206\u590d\u7528\u6280\u672f\u539f\u7406"},"content":{"rendered":"\n<p>\u3000\u3000<strong>\u6b63\u4ea4\u9891\u5206\u590d\u7528(OFDM)\u6280\u672f<\/strong>\u662f\u4e00\u79cd\u591a\u8f7d\u6ce2\u8c03\u5236\u6280\u672f\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u6570\u5b57\u901a\u4fe1\u7cfb\u7edf\u4e2d\u3002\u5176\u57fa\u672c\u539f\u7406\u662f\u5c06\u9ad8\u901f\u4fe1\u606f\u6570\u636e\u7f16\u7801\u540e\u5206\u914d\u5230\u76f8\u4e92\u6b63\u4ea4\u7684N\u4e2a\u5e76\u884c\u8f7d\u6ce2\u4e0a\u8fdb\u884c\u4f20\u8f93\u3002OFDM\u901a\u8fc7\u9891\u5206\u590d\u7528\u5b9e\u73b0\u9ad8\u901f\u4e32\u884c\u6570\u636e\u7684\u5e76\u884c\u4f20\u8f93\uff0c\u5177\u6709\u8f83\u597d\u7684\u6297\u591a\u5f84\u8870\u843d\u7684\u80fd\u529b\uff0c\u80fd\u591f\u652f\u6301\u591a\u7528\u6237\u63a5\u5165\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5728OFDM\u7cfb\u7edf\u4e2d\uff0c\u9996\u5148\u5c06\u5e26\u6709\u9ad8\u901f\u6570\u5b57\u4fe1\u606f\u7684\u57fa\u5e26\u4fe1\u53f7\u7ecf\u8fc7IFFT\u53d8\u6362\u5f97\u5230\u591a\u4e2a\u6b63\u4ea4\u5b50\u8f7d\u6ce2\u7684\u4f4e\u901f\u4fe1\u53f7\uff0c\u8fd9\u4e9b\u4f4e\u901f\u4fe1\u53f7\u5728\u9891\u57df\u4e0a\u5f62\u6210\u4e00\u4e2a\u5e73\u5766\u7684\u5e26\u5bbd\u3002\u6bcf\u4e2a\u5b50\u8f7d\u6ce2\u4e0a\u7684\u4fe1\u53f7\u5e26\u5bbd\u5c0f\u4e8e\u4fe1\u9053\u7684\u76f8\u5173\u5e26\u5bbd\uff0c\u56e0\u6b64\u6bcf\u4e2a\u5b50\u4fe1\u9053\u4e0a\u7684\u53ef\u4ee5\u770b\u6210\u5e73\u5766\u6027\u8870\u843d\uff0c\u4ece\u800c\u53ef\u4ee5\u6d88\u9664\u7b26\u53f7\u95f4\u5e72\u6270\u3002\u8fd9\u79cd\u8bbe\u8ba1\u5141\u8bb8\u4f7f\u7528\u5355\u62bd\u5934\u5747\u8861\u5668\u6765\u68c0\u6d4b\u63a5\u6536\u7aef\u7684\u4f20\u8f93\u6570\u636e\uff0c\u56e0\u4e3a\u5176\u6b63\u4ea4\u6027\u5c5e\u6027\u4fdd\u8bc1\u4e86\u5b50\u8f7d\u6ce2\u4e4b\u95f4\u7684\u6b63\u4ea4\u6027\u4e0d\u88ab\u65e0\u7ebf\u4fe1\u9053\u7834\u574f\u3002<\/p>\n\n\n\n<p>\u3000\u3000OFDM\u6280\u672f\u7684\u4e00\u4e2a\u5173\u952e\u4f18\u52bf\u662f\u5b83\u4e0d\u9700\u8981\u5b50\u8f7d\u6ce2\u95f4\u653e\u7f6e\u4fdd\u62a4\u9891\u5e26(guard band)\uff0c\u8fd9\u662f\u56e0\u4e3a\u57fa\u4e8e\u5085\u91cc\u53f6\u53d8\u6362(Fourier transform)\u7684\u6570\u5b57\u4fe1\u53f7\u5904\u7406\u5b9e\u73b0\u4e86\u9891\u57df\u5b50\u8f7d\u6ce2\u4e4b\u95f4\u7684\u4e92\u76f8\u6b63\u4ea4\u3002\u6b64\u5916\uff0cOFDM\u6280\u672f\u8fd8\u5177\u6709\u6297\u591a\u5f84\u8870\u843d\u80fd\u529b\u5f3a\u3001\u9891\u8c31\u5229\u7528\u7387\u9ad8\u7b49\u4f18\u70b9\uff0c\u7279\u522b\u9002\u5408\u65e0\u7ebf\u4fe1\u9053\u3002<\/p>\n\n\n\n<p>\u3000\u3000OFDM\u6280\u672f\u901a\u8fc7\u5c06\u9ad8\u901f\u6570\u636e\u4fe1\u53f7\u8f6c\u6362\u6210\u5e76\u884c\u7684\u4f4e\u901f\u5b50\u6570\u636e\u6d41\uff0c\u5e76\u8c03\u5236\u5230\u5728\u6bcf\u4e2a\u5b50\u4fe1\u9053\u4e0a\u8fdb\u884c\u4f20\u8f93\uff0c\u5b9e\u73b0\u4e86\u9ad8\u6548\u7684\u9891\u8c31\u5229\u7528\u7387\u548c\u5f3a\u5927\u7684\u6297\u5e72\u6270\u80fd\u529b\u3002\u8fd9\u79cd\u6280\u672f\u4e0d\u4ec5\u9002\u7528\u4e8e\u6570\u5b57\u901a\u4fe1\u7cfb\u7edf\uff0c\u800c\u4e14\u56e0\u5176\u4f18\u5f02\u7684\u6027\u80fd\uff0c\u5728\u73b0\u4ee3\u901a\u4fe1\u9886\u57df\u5f97\u5230\u4e86\u5e7f\u6cdb\u5e94\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u4e00\u3001 \u6b63\u4ea4\u9891\u5206\u590d\u7528(OFDM)\u6280\u672f\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u65e0\u7ebf\u901a\u4fe1\u7cfb\u7edf\u4e2d\u7684\u5e94\u7528\u6848\u4f8b\u6709\u54ea\u4e9b?<\/h2>\n\n\n\n<p>\u3000\u3000\u6b63\u4ea4\u9891\u5206\u590d\u7528(OFDM)\u6280\u672f\u56e0\u5176\u5728\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u7387\u3001\u53ef\u9760\u6027\u548c\u9891\u8c31\u5229\u7528\u7387\u65b9\u9762\u7684\u4f18\u52bf\uff0c\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u65e0\u7ebf\u901a\u4fe1\u7cfb\u7edf\u4e2d\u5f97\u5230\u4e86\u5e7f\u6cdb\u5e94\u7528\u3002OFDM\u6280\u672f\u7684\u5e94\u7528\u6848\u4f8b\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3000\u3000\u65e0\u7ebf\u5c40\u57df\u7f51\uff1aOFDM\u6280\u672f\u5728\u65e0\u7ebf\u5c40\u57df\u7f51\u4e2d\u7684\u5e94\u7528\uff0c\u5c55\u73b0\u4e86\u5176\u5728\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u7387\u548c\u53ef\u9760\u6027\u65b9\u9762\u7684\u4f18\u52bf\u3002<\/li>\n\n\n\n<li>\u3000\u3000\u79fb\u52a8\u901a\u4fe1\u7cfb\u7edf\uff1aOFDM\u6280\u672f\u662f4G LTE\u7cfb\u7edf\u4e2d\u7684\u6700\u6838\u5fc3\u6280\u672f\u4e4b\u4e00\uff0c\u7279\u522b\u662f\u5728\u5e94\u5bf9\u591a\u5f84\u5e72\u6270\u65b9\u9762\u8868\u73b0\u51fa\u8272\u3002\u968f\u77405G\u65f6\u4ee3\u7684\u5230\u6765\uff0cOFDM\u6280\u672f\u4e5f\u88ab\u89c6\u4e3a6G\u7684\u5173\u952e\u6280\u672f\u4e4b\u4e00\u3002\u6b64\u5916\uff0cOFDM\u6280\u672f\u8fd8\u88ab\u7528\u4e8e5G\u7f51\u7edc\u4e2d\uff0c\u901a\u8fc7\u91c7\u7528OFDM\u590d\u7528\u6280\u672f\uff0c\u4f7f\u5f97\u627f\u8f7d\u4e0d\u540c\u7528\u6237\u6570\u636e\u7684\u65e0\u7ebf\u7535\u6ce2\u53ef\u4ee5\u5728\u9891\u7387\u4e0a\u4ea4\u53e0\u5728\u4e00\u8d77\u4f20\u8f93\uff0c\u800c\u4e92\u4e0d\u5e72\u6270\uff0c\u5927\u5927\u63d0\u5347\u4e86\u79fb\u52a8\u901a\u4fe1\u7684\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u3000\u3000\u5149\u901a\u4fe1\u7cfb\u7edf\uff1aOFDM\u6280\u672f\u4e0d\u4ec5\u5e94\u7528\u4e8e\u65e0\u7ebf\u901a\u4fe1\u9886\u57df\uff0c\u4e5f\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5149\u901a\u4fe1\u7cfb\u7edf\u4e2d\uff0c\u8fdb\u4e00\u6b65\u8bc1\u660e\u4e86\u5176\u5728\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u7387\u548c\u9891\u8c31\u5229\u7528\u7387\u65b9\u9762\u7684\u6709\u6548\u6027\u3002<\/li>\n\n\n\n<li>\u3000\u3000\u6570\u5b57\u5e7f\u64ad\u7cfb\u7edf\uff1aOFDM\u6280\u672f\u5728\u6570\u5b57\u5e7f\u64ad\u7cfb\u7edf\u4e2d\u7684\u5e94\u7528\uff0c\u5c55\u793a\u4e86\u5176\u5728\u63d0\u4f9b\u9ad8\u8d28\u91cf\u97f3\u9891\u548c\u89c6\u9891\u4f20\u8f93\u65b9\u9762\u7684\u6f5c\u529b\u3002<\/li>\n\n\n\n<li>\u3000\u3000\u8702\u7a9d\u79fb\u52a8\u901a\u4fe1\u7cfb\u7edf\uff1aOFDM\u6280\u672f\u5728\u8702\u7a9d\u79fb\u52a8\u901a\u4fe1\u7cfb\u7edf\u4e2d\u7684\u5e94\u7528\uff0c\u7279\u522b\u662f\u5728\u63d0\u5347\u7cfb\u7edf\u5bb9\u91cf\u548c\u6297\u5e72\u6270\u80fd\u529b\u65b9\u9762\uff0c\u901a\u8fc7\u5408\u7406\u5206\u914d\u6bd4\u7279\u548c\u529f\u7387\u8d44\u6e90\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u3000\u3000\u7535\u529b\u7ebf\u8f7d\u6ce2\u901a\u4fe1\u7cfb\u7edf\uff1aOFDM\u6280\u672f\u4e5f\u88ab\u5e94\u7528\u4e8e\u7535\u529b\u7ebf\u8f7d\u6ce2\u901a\u4fe1\u7cfb\u7edf\u4e2d\uff0c\u8fd9\u8868\u660eOFDM\u6280\u672f\u5177\u6709\u8de8\u5a92\u4ecb\u7684\u5e94\u7528\u6f5c\u529b\uff0c\u80fd\u591f\u5728\u4e0d\u540c\u7684\u901a\u4fe1\u73af\u5883\u4e2d\u63d0\u4f9b\u6709\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u3000\u3000\u6b63\u4ea4\u9891\u5206\u590d\u7528(OFDM)\u6280\u672f\u5728\u65e0\u7ebf\u5c40\u57df\u7f51\u3001\u79fb\u52a8\u901a\u4fe1\u7cfb\u7edf(\u5305\u62ec4G LTE\u548c5G)\u3001\u5149\u901a\u4fe1\u7cfb\u7edf\u3001\u6570\u5b57\u5e7f\u64ad\u7cfb\u7edf\u3001\u8702\u7a9d\u79fb\u52a8\u901a\u4fe1\u7cfb\u7edf\u4ee5\u53ca\u7535\u529b\u7ebf\u8f7d\u6ce2\u901a\u4fe1\u7cfb\u7edf\u7b49\u591a\u4e2a\u9886\u57df\u4e2d\u90fd\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u6848\u4f8b\uff0c\u5c55\u73b0\u4e86\u5176\u5728\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u901f\u7387\u3001\u53ef\u9760\u6027\u548c\u9891\u8c31\u5229\u7528\u7387\u65b9\u9762\u7684\u663e\u8457\u4f18\u52bf\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u4e8c\u3001 OFDM\u6280\u672f\u5982\u4f55\u89e3\u51b3\u591a\u5f84\u8870\u843d\u95ee\u9898\uff0c\u5177\u4f53\u91c7\u7528\u4e86\u54ea\u4e9b\u6280\u672f\u6216\u7b97\u6cd5?<\/h2>\n\n\n\n<p>\u3000\u3000OFDM\u6280\u672f\u901a\u8fc7\u91c7\u7528\u591a\u79cd\u6280\u672f\u548c\u7b97\u6cd5\u6765\u89e3\u51b3\u591a\u5f84\u8870\u843d\u95ee\u9898\u3002\u9996\u5148\uff0cOFDM\u7cfb\u7edf\u901a\u8fc7\u5c06\u4fe1\u53f7\u5206\u5272\u6210\u591a\u4e2a\u5b50\u8f7d\u6ce2\u5e76\u5bf9\u5176\u8fdb\u884c\u8c03\u5236\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u51cf\u5c11\u7531\u4e8e\u591a\u5f84\u6548\u5e94\u5f15\u8d77\u7684\u4fe1\u53f7\u5e72\u6270\u3002\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8\u7cfb\u7edf\u5728\u4e0d\u540c\u7684\u9891\u7387\u4e0a\u72ec\u7acb\u5730\u4f20\u8f93\u6570\u636e\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u4fe1\u53f7\u4e4b\u95f4\u7684\u76f8\u4e92\u5e72\u6270\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u4e3a\u4e86\u8fdb\u4e00\u6b65\u63d0\u9ad8OFDM\u7cfb\u7edf\u5728\u591a\u5f84\u8870\u843d\u73af\u5883\u4e0b\u7684\u6027\u80fd\uff0c\u91c7\u7528\u4e86\u4fe1\u9053\u4f30\u8ba1\u548c\u4fe1\u9053\u5747\u8861\u6280\u672f\u3002\u4fe1\u9053\u4f30\u8ba1\u7684\u76ee\u7684\u662f\u4f30\u8ba1\u51fa\u4fe1\u9053\u7684\u72b6\u6001\u53c2\u6570\uff0c\u5982\u5ef6\u8fdf\u3001\u8870\u51cf\u7cfb\u6570\u7b49\uff0c\u8fd9\u5bf9\u4e8e\u540e\u7eed\u7684\u4fe1\u9053\u5747\u8861\u81f3\u5173\u91cd\u8981\u3002\u4fe1\u9053\u5747\u8861\u5219\u5229\u7528\u8fd9\u4e9b\u72b6\u6001\u53c2\u6570\u6765\u8c03\u6574\u6bcf\u4e2a\u5b50\u8f7d\u6ce2\u7684\u4f20\u8f93\u529f\u7387\uff0c\u4ee5\u8865\u507f\u4fe1\u9053\u7684\u4e0d\u5747\u5300\u6027\uff0c\u4ece\u800c\u63d0\u9ad8\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u6b64\u5916\uff0cOFDM\u7cfb\u7edf\u8fd8\u91c7\u7528\u4e86\u7b26\u53f7\u540c\u6b65\u65b9\u6cd5\u6765\u5e94\u5bf9\u591a\u5f84\u8870\u843d\u5e26\u6765\u7684\u6311\u6218\u3002\u7b26\u53f7\u540c\u6b65\u662f\u6307\u786e\u4fddOFDM\u7cfb\u7edf\u7684\u53d1\u9001\u548c\u63a5\u6536\u7aef\u5728\u65f6\u95f4\u4e0a\u5bf9\u9f50\uff0c\u8fd9\u5bf9\u4e8e\u4fdd\u8bc1\u6570\u636e\u4f20\u8f93\u7684\u51c6\u786e\u6027\u81f3\u5173\u91cd\u8981\u3002\u901a\u8fc7\u5229\u7528\u524d\u4e00\u5e27\u4f30\u8ba1\u7684\u4fe1\u9053\u6700\u5927\u65f6\u5ef6\u6765\u8c03\u6574\u76f8\u5173\u7a97\u957f\u5ea6\uff0c\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u51cf\u5c11\u591a\u5f84\u8870\u843d\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5728\u4fe1\u53f7\u68c0\u6d4b\u65b9\u9762\uff0cOFDM\u7cfb\u7edf\u91c7\u7528\u4e86\u591a\u79cd\u7b97\u6cd5\uff0c\u5305\u62ec\u8feb\u96f6ZF\u68c0\u6d4b\u3001\u5747\u65b9\u8bef\u5deeMMSE\u68c0\u6d4b\u3001V-BLAST\u68c0\u6d4b\u548c\u6700\u5927\u4f3c\u7136\u68c0\u6d4b\u7b97\u6cd5\u7b49\u3002\u8fd9\u4e9b\u7b97\u6cd5\u65e8\u5728\u4f18\u5316\u4fe1\u53f7\u7684\u68c0\u6d4b\u8fc7\u7a0b\uff0c\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u7684\u51c6\u786e\u6027\u548c\u6548\u7387\u3002<\/p>\n\n\n\n<p>\u3000\u3000OFDM\u6280\u672f\u901a\u8fc7\u91c7\u7528\u4fe1\u9053\u4f30\u8ba1\u3001\u4fe1\u9053\u5747\u8861\u3001\u7b26\u53f7\u540c\u6b65\u4ee5\u53ca\u591a\u79cd\u4fe1\u53f7\u68c0\u6d4b\u7b97\u6cd5\u7b49\u6280\u672f\u6216\u7b97\u6cd5\uff0c\u6709\u6548\u89e3\u51b3\u4e86\u591a\u5f84\u8870\u843d\u95ee\u9898\uff0c\u63d0\u9ad8\u4e86\u65e0\u7ebf\u901a\u4fe1\u7cfb\u7edf\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u4e09\u3001 \u5728OFDM\u7cfb\u7edf\u4e2d\uff0cIFFT\u53d8\u6362\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u548c\u5bf9\u4fe1\u53f7\u8d28\u91cf\u7684\u5f71\u54cd\u662f\u4ec0\u4e48?<\/h2>\n\n\n\n<p>\u3000\u3000\u5728OFDM\u7cfb\u7edf\u4e2d\uff0cIFFT(\u9006\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362)\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u4e3b\u8981\u662f\u901a\u8fc7\u6570\u5b66\u65b9\u6cd5\u6765\u7b80\u5316\u7cfb\u7edf\u7684\u590d\u6742\u5ea6\u3002IFFT\u7684\u4f5c\u7528\u662f\u5728\u53d1\u9001\u7aef\u8ba1\u7b97\u4fe1\u53f7\u7684\u53e0\u52a0\u6ce2\u5f62\uff0c\u5728\u63a5\u6536\u7aef\u53bb\u9664\u6b63\u4ea4\u5b50\u8f7d\u6ce2\uff0c\u4ece\u800c\u5b9e\u73b0\u591a\u8f7d\u6ce2\u5408\u8def\u7684\u8fc7\u7a0b\u3002\u5177\u4f53\u6765\u8bf4\uff0cIFFT\u662fOFDM\u7cfb\u7edf\u4e2d\u7684\u5173\u952e\u6b65\u9aa4\u4e4b\u4e00\uff0c\u5b83\u5141\u8bb8\u76f4\u63a5\u4ece\u9891\u57df\u4fe1\u53f7\u8f6c\u6362\u5230\u65f6\u57df\u4fe1\u53f7\uff0c\u800c\u65e0\u9700\u8fdb\u884c\u8f7d\u6ce2\u8c03\u5236\u3001\u591a\u8def\u53e0\u52a0\u548c\u91c7\u6837\u7b49\u8fd0\u7b97\uff0c\u8fd9\u6837\u5927\u5927\u7b80\u5316\u4e86\u7cfb\u7edf\u7684\u590d\u6742\u5ea6\u3002\u6b64\u5916\uff0cIFFT\u7684\u9ad8\u6548\u5b9e\u73b0\u65b9\u5f0f\u8fd8\u5305\u62ec\u5229\u7528\u4f18\u5316\u7b97\u6cd5\u8bbe\u8ba1\u7684\u5904\u7406\u5668\uff0c\u5982radix-4\u4f18\u5316\u7b97\u6cd5\u8bbe\u8ba1\u768464\u70b9IFFT\/FFT\u5904\u7406\u5668\uff0c\u8fd9\u79cd\u5904\u7406\u5668\u5177\u6709\u8fd0\u7b97\u901f\u5ea6\u5feb\u3001\u7cbe\u5ea6\u9ad8\u3001\u8d44\u6e90\u8282\u7701\u7684\u4f18\u70b9\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u5468\u671f\u524d\u7f00\u7684\u957f\u5ea6\u901a\u5e38\u8981\u6bd4\u79bb\u6563\u4fe1\u9053\u7684\u957f\u5ea6\u957f\u4e00\u4e9b\uff0c\u4ee5\u786e\u4fdd\u80fd\u591f\u5b8c\u5168\u6d88\u9664ISI\u3002\u56e0\u6b64\uff0cIFFT\u4e0d\u4ec5\u5728\u6570\u5b66\u4e0a\u63d0\u4f9b\u4e86\u4e00\u79cd\u5feb\u901f\u5b9e\u73b0\u5b50\u8f7d\u6ce2\u53e0\u52a0\u7684\u65b9\u5f0f\uff0c\u800c\u4e14\u901a\u8fc7\u9002\u5f53\u7684\u5faa\u73af\u524d\u7f00\u63d2\u5165\uff0c\u8fd8\u80fd\u6709\u6548\u6539\u5584\u4fe1\u53f7\u8d28\u91cf\uff0c\u51cf\u5c11\u8bef\u7801\u7387\u3002<\/p>\n\n\n\n<p>\u3000\u3000IFFT\u5728OFDM\u7cfb\u7edf\u4e2d\u7684\u5b9e\u73b0\u65b9\u5f0f\u4e3b\u8981\u662f\u901a\u8fc7\u6570\u5b66\u65b9\u6cd5\u7b80\u5316\u7cfb\u7edf\u590d\u6742\u5ea6\uff0c\u5e76\u901a\u8fc7\u4f18\u5316\u7b97\u6cd5\u63d0\u9ad8\u5904\u7406\u6548\u7387\u3002\u540c\u65f6\uff0cIFFT\u5904\u7406\u540e\u7684\u4fe1\u53f7\u8d28\u91cf\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0\u5faa\u73af\u524d\u7f00\u6765\u8fdb\u4e00\u6b65\u63d0\u5347\uff0c\u8fd9\u5bf9\u4e8e\u786e\u4fdd\u901a\u4fe1\u7cfb\u7edf\u7684\u53ef\u9760\u6027\u548c\u7a33\u5b9a\u6027\u975e\u5e38\u91cd\u8981\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u3000\u3000\u56db\u3001 OFDM\u6280\u672f\u7684\u9891\u8c31\u5229\u7528\u7387\u4e0e\u4f20\u7edf\u8c03\u5236\u6280\u672f\u76f8\u6bd4\u6709\u4f55\u4f18\u52bf\u548c\u52a3\u52bf?<\/h2>\n\n\n\n<p>\u3000\u3000OFDM\u6280\u672f\u76f8\u6bd4\u4e8e\u4f20\u7edf\u8c03\u5236\u6280\u672f\uff0c\u5728\u9891\u8c31\u5229\u7528\u7387\u65b9\u9762\u5177\u6709\u660e\u663e\u7684\u4f18\u52bf\u548c\u52a3\u52bf\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u4f18\u52bf\u65b9\u9762\uff0cOFDM\u6280\u672f\u80fd\u591f\u5927\u5e45\u63d0\u9ad8\u9891\u8c31\u5229\u7528\u7387\uff0c\u5b9e\u73b0\u66f4\u9ad8\u7684\u6570\u636e\u4f20\u8f93\u901f\u7387\u3002\u8fd9\u662f\u56e0\u4e3aOFDM\u901a\u8fc7\u91c7\u7528\u76f8\u4e92\u6b63\u4ea4\u7684\u591a\u8f7d\u6ce2\u4f20\u9012\u4fe1\u606f\uff0c\u4f7f\u5f97\u6269\u9891\u540e\u7684\u9891\u8c31\u53ef\u4ee5\u76f8\u4e92\u53e0\u52a0\uff0c\u4ece\u800c\u51cf\u5c0f\u4e86\u5b50\u8f7d\u6ce2\u95f4\u7684\u76f8\u4e92\u5e72\u6270\uff0c\u5927\u5927\u63d0\u9ad8\u4e86\u9891\u8c31\u5229\u7528\u7387\u3002\u6b64\u5916\uff0c\u53ea\u8981OFDM\u7684\u5b50\u8f7d\u6ce2\u6570\u91cf\u8db3\u591f\u591a\uff0c\u5c31\u53ef\u4ee5\u5ffd\u7565\u5e26\u5916\u4fe1\u53f7\uff0c\u9891\u5e26\u5229\u7528\u7387\u8fbe\u5230\u7ea6\u7b49\u4e8e1B\/Hz\uff0c\u4ece\u8fd9\u4e2a\u610f\u4e49\u4e0a\u8bf4\uff0cOFDM\u7684\u9891\u5e26\u6548\u7387\u662f\u5355\u8f7d\u6ce2\u7684\u4e24\u500d\u3002\u8fd9\u8868\u660eOFDM\u6280\u672f\u5728\u5904\u7406\u9ad8\u901f\u6570\u636e\u4f20\u8f93\u65f6\uff0c\u80fd\u591f\u6709\u6548\u6291\u5236\u548c\u6d88\u9664\u7531\u4e8e\u4fe1\u9053\u7684\u65f6\u5ef6\u6269\u5c55\u5f15\u8d77\u7684\u9891\u7387\u9009\u62e9\u6027\u8870\u843d\uff0c\u5177\u6709\u8f83\u9ad8\u7684\u9891\u8c31\u5229\u7528\u7387\u548c\u5bb9\u6613\u5b9e\u73b0\u8c03\u5236\u89e3\u8c03\u7684\u7279\u70b9\u3002<\/p>\n\n\n\n<p>\u3000\u3000\u52a3\u52bf\u65b9\u9762\uff0c\u5c3d\u7ba1OFDM\u6280\u672f\u5728\u63d0\u9ad8\u9891\u8c31\u5229\u7528\u7387\u65b9\u9762\u8868\u73b0\u51fa\u8272\uff0c\u4f46\u5b83\u4e5f\u5b58\u5728\u4e00\u4e9b\u56fa\u6709\u7684\u7f3a\u70b9\u3002\u4f8b\u5982\uff0cOFDM\u7cfb\u7edf\u7684\u590d\u6742\u5ea6\u8f83\u9ad8\uff0c\u9700\u8981\u8fdb\u884c\u9ad8\u7cbe\u5ea6\u7684CSI\u4f30\u8ba1\uff0c\u4ee5\u53ca\u4f7f\u7528\u5bc6\u5ea6\u66f4\u9ad8\u7684\u661f\u5ea7\u70b9\u8fdb\u884c\u7b26\u53f7\u6620\u5c04\u7b49\u3002\u8fd9\u4e9b\u56e0\u7d20\u4e0d\u4ec5\u589e\u52a0\u4e86\u7cfb\u7edf\u7684\u5b9e\u73b0\u96be\u5ea6\uff0c\u8fd8\u53ef\u80fd\u5f71\u54cd\u5230\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u6027\u80fd\u8868\u73b0\u3002\u56e0\u6b64\uff0c\u5728\u8003\u8651\u91c7\u7528OFDM\u6280\u672f\u65f6\uff0c\u9700\u8981\u5145\u5206\u8003\u8651\u5176\u9891\u8c31\u6548\u7387\u4f4e\u3001\u590d\u6742\u5ea6\u9ad8\u7b49\u7f3a\u70b9\uff0c\u5e76\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u8fdb\u884c\u6743\u8861\u3002<\/p>\n\n\n\n<p>\u3000\u3000OFDM\u6280\u672f\u76f8\u8f83\u4e8e\u4f20\u7edf\u8c03\u5236\u6280\u672f\uff0c\u5728\u9891\u8c31\u5229\u7528\u7387\u65b9\u9762\u5177\u6709\u663e\u8457\u7684\u4f18\u52bf\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u9ad8\u901f\u6570\u636e\u4f20\u8f93\u548c\u6297\u591a\u5f84\u8870\u843d\u65b9\u9762\u8868\u73b0\u7a81\u51fa\u3002\u7136\u800c\uff0c\u5176\u8f83\u9ad8\u7684\u7cfb\u7edf\u590d\u6742\u5ea6\u548c\u5bf9\u9ad8\u7cbe\u5ea6CSI\u4f30\u8ba1\u7684\u9700\u6c42\u4e5f\u662f\u4e0d\u53ef\u5ffd\u89c6\u7684\u52a3\u52bf\u3002\u56e0\u6b64\uff0c\u5728\u9009\u62e9\u9002\u5408\u7684\u5e94\u7528\u573a\u666f\u65f6\uff0c\u9700\u8981\u6839\u636e\u5177\u4f53\u9700\u6c42\u548c\u6761\u4ef6\u7efc\u5408\u8003\u8651\u8fd9\u4e9b\u4f18\u7f3a\u70b9\u3002<\/p>\n\n\n\n<h2 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