时分复用为什么要比频分复用要好 谁能解决一下问题，是简述 频分复用，时分复用 码分复用 以及...
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\u65f6\u5206\u590d\u7528\uff08TDM\uff09\uff1a\u6309\u65f6\u95f4\u5212\u5206\u6210\u4e0d\u540c\u7684\u4fe1\u9053\uff0c\u6bcf\u4e00\u4e2a\u65f6\u5206\u590d\u7528\u7684\u7528\u6237\u5728\u6bcf\u4e00\u4e2aTDM\u5e27\u4e2d\u5360\u7528\u56fa\u5b9a\u5e8f\u5217\u53f7\u7684\u95f4\u9699\uff0c\u53ef\u89c1\u65f6\u5206\u590d\u7528\u7684\u6240\u6709\u7528\u6237\u662f\u5728\u4e0d\u540c\u65f6\u95f4\u5360\u7528\u540c\u6837\u7684\u9891\u5e26\u5bbd\u5ea6
\u7801\u5206\u590d\u7528\uff08CMD\uff09\uff1a\u66f4\u5e38\u7528\u7684\u662f\u7801\u5206\u591a\u5740\uff08CMDA\uff09\uff0c\u6bcf\u4e00\u4e2a\u7528\u6237\u53ef\u4ee5\u5728\u540c\u6837\u7684\u65f6\u95f4\u4f7f\u7528\u540c\u6837\u7684\u9891\u5e26\u8fdb\u884c\u901a\u4fe1\uff0c\u7531\u4e8e\u5404\u7528\u6237\u4f7f\u7528\u7ecf\u8fc7\u7279\u6b8a\u6311\u9009\u7684\u4e0d\u540c\u7801\u578b\uff0c\u56e0\u6b64\u5404\u7528\u6237\u4e4b\u95f4\u4e0d\u4f1a\u9020\u6210\u5e72\u6270\u3002\u7801\u5206\u590d\u7528\u6700\u521d\u7528\u4e8e\u519b\u4e8b\u901a\u4fe1\uff0c\u56e0\u4e3a\u8fd9\u79cd\u7cfb\u7edf\u53d1\u9001\u7684\u4fe1\u53f7\u6709\u5f88\u5f3a\u7684\u6297\u5e72\u6270\u80fd\u529b\uff0c\u5176\u9891\u8c31\u7c7b\u4f3c\u4e8e\u767d\u566a\u58f0\uff0c\u4e0d\u6613\u88ab\u654c\u4eba\u53d1\u73b0\uff0c\u540e\u6765\u624d\u5e7f\u6cdb\u7684\u4f7f\u7528\u5728\u6c11\u7528\u7684\u79fb\u52a8\u901a\u4fe1\u4e2d\uff0c\u5b83\u7684\u4f18\u8d8a\u6027\u5728\u4e8e\u53ef\u4ee5\u63d0\u9ad8\u901a\u4fe1\u7684\u8bdd\u97f3\u8d28\u91cf\u548c\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\uff0c\u51cf\u5c11\u5e72\u6270\u5bf9\u901a\u4fe1\u7684\u5f71\u54cd\uff0c\u589e\u5927\u901a\u4fe1\u7cfb\u7edf\u7684\u5bb9\u91cf\uff0c\uff0c\u964d\u4f4e\u624b\u673a\u7684\u5e73\u5747\u53d1\u5c04\u529f\u7387\u7b49\uff0c\u5176\u5de5\u4f5c\u539f\u7406\u5982\u4e0b\uff1a
\u5728CDMA\u4e2d\uff0c\u6bcf\u4e00\u4e2a\u6bd4\u7279\u65f6\u95f4\u5728\u5212\u5206\u4e3am\u4e2a\u77ed\u7684\u95f4\u9694\uff0c\u79f0\u4e3a\u7801\u7247\uff08chip\uff09\uff0c\u901a\u5e38m\u7684\u503c\u4e3a64\u6216128\uff0c\u4e3a\u4e86\u65b9\u4fbf\u8bf4\u660e\uff0c\u53d6m\u4e3a8
1. \u4f7f\u7528CDMA\u7684\u6bcf\u4e00\u4e2a\u7ad9\u88ab\u6307\u6d3e\u4e00\u4e2a\u552f\u4e00\u7684m bit\u7801\u7247\u5e8f\u5217\uff0c\u4e00\u4e2a\u7ad9\u5982\u679c\u8981\u53d1\u9001\u6bd4\u72791\uff0c\u5219\u53d1\u9001\u5b83\u81ea\u5df1\u7684m bit\u7801\u7247\u5e8f\u5217\uff0c\u5982\u679c\u8981\u53d1\u90010\uff0c\u5219\u53d1\u9001\u8be5\u7801\u7247\u5e8f\u5217\u7684\u4e8c\u8fdb\u5236\u53cd\u7801\uff0c\u6309\u7167\u60ef\u4f8b\u5c06\u7801\u7247\u4e2d\u76840\u5199\u6210-1\uff0c\u5c061\u5199\u6210+1
2. CDMA\u7ed9\u6bcf\u4e00\u4e2a\u7ad9\u5206\u914d\u7684\u7801\u7247\u5e8f\u5217\u4e0d\u4ec5\u5fc5\u987b\u5404\u4e0d\u76f8\u540c\uff0c\u5e76\u4e14\u8fd8\u5fc5\u987b\u4e92\u76f8\u6b63\u4ea4\uff0c\u7528\u6570\u5b66\u516c\u5f0f\u8868\u793a\uff0c\u4ee4\u5411\u91cfS\u8868\u793a\u7ad9S\u7684\u7801\u7247\u5411\u91cf\uff0c\u518d\u4ee4T\u8868\u793a\u5176\u4ed6\u4efb\u4f55\u7ad9\u7684\u7801\u7247\u5411\u91cf\u3002\u4e24\u4e2a\u4e0d\u540c\u7ad9\u7684\u7801\u7247\u5e8f\u5217\u6b63\u4ea4\uff0c\u5c31\u662f\u5411\u91cfS\u548cT\u7684\u89c4\u683c\u5316\u5185\u79ef\u90fd\u662f0\uff1aS T = = 0
3. \u4efb\u4f55\u4e00\u4e2a\u7801\u7247\u5411\u91cf\u548c\u8be5\u7801\u7247\u5411\u91cf\u81ea\u5df1\u7684\u89c4\u683c\u5316\u5185\u79ef\u90fd\u662f1\uff1aS = = = 1
4. \u4efb\u4f55\u4e00\u4e2a\u7801\u7247\u5411\u91cf\u548c\u8be5\u7801\u7247\u7684\u53cd\u7801\u7684\u5411\u91cf\u7684\u89c4\u683c\u5316\u5185\u79ef\u90fd\u662f-1
\u6240\u6709\u5176\u4ed6\u7ad9\u7684\u4fe1\u53f7\u90fd\u88ab\u8fc7\u6ee4\uff0c\u800c\u53ea\u5269\u4e0bS\u7ad9\u53d1\u9001\u7684\u4fe1\u53f7\u3002\u5f53S\u7ad9\u53d1\u9001\u6bd4\u72791\u65f6\uff0c\u5728X\u7ad9\u8ba1\u7b97\u5185\u79ef\u7ed3\u679c\u4e3a+1\uff0c\u5f53S\u7ad9\u53d1\u9001\u6bd4\u72790\u65f6\uff0c\u5185\u79ef\u7ed3\u679c\u4e3a-1
频分受制于带宽,频率带宽.
时分的可以不受限于传输带宽.
现在已经有综合在一起的了!
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