{"id":40249,"date":"2025-05-28T13:43:01","date_gmt":"2025-05-28T05:43:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/40249.html"},"modified":"2025-05-28T13:43:01","modified_gmt":"2025-05-28T05:43:01","slug":"%e5%9f%ba%e4%ba%8ematlab%e7%9a%84%e5%a4%a7%e8%a7%84%e6%a8%a1mimo%e4%bf%a1%e9%81%93%e4%bb%bf%e7%9c%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/40249.html","title":{"rendered":"\u57fa\u4e8eMATLAB\u7684\u5927\u89c4\u6a21MIMO\u4fe1\u9053\u4eff\u771f"},"content":{"rendered":"
1. \u7cfb\u7edf\u6a21\u578b\u4e0e\u53c2\u6570\u8bbe\u7f6e<\/h5>\n

\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5355\u5c0f\u533a\u5927\u89c4\u6a21MIMO\u7cfb\u7edf\u7684\u53c2\u6570\u914d\u7f6e\u793a\u4f8b，\u9002\u7528\u4e8e\u591a\u53d1\u591a\u6536\u548c\u5355\u53d1\u5355\u6536\u573a\u666f\u3002<\/p>\n

% \u53c2\u6570\u914d\u7f6e<\/span>
\nparams.<\/span>N_cell =<\/span> 1<\/span>;<\/span> % \u5c0f\u533a\u6570\u91cf（\u5355\u5c0f\u533a\u4eff\u771f）<\/span>
\nparams.<\/span>cell_radius =<\/span> 500<\/span>;<\/span> % \u5c0f\u533a\u534a\u5f84（\u7c73）<\/span>
\nparams.<\/span>N_tx =<\/span> 64<\/span>;<\/span> % \u57fa\u7ad9\u53d1\u5c04\u5929\u7ebf\u6570\u91cf<\/span>
\nparams.<\/span>N_rx =<\/span> 1<\/span>;<\/span> % \u7528\u6237\u63a5\u6536\u5929\u7ebf\u6570\u91cf（\u5355\u53d1\u5355\u6536）<\/span>
\nparams.<\/span>d2d_pairs =<\/span> 3<\/span>;<\/span> % D2D\u7528\u6237\u5bf9\u6570\u91cf（\u53ef\u9009）<\/span>
\nparams.<\/span>ptx_max =<\/span> 30<\/span>;<\/span> % \u6700\u5927\u53d1\u5c04\u529f\u7387（dBm）<\/span>
\nparams.<\/span>noise_power =<\/span> –<\/span>114<\/span>;<\/span> % \u566a\u58f0\u529f\u7387（dBm）<\/span>
\nparams.<\/span>target_snr =<\/span> 6<\/span>;<\/span> % \u76ee\u6807SINR（dB）<\/span>
\nparams.<\/span>path_loss_exp =<\/span> 3.5<\/span>;<\/span> % \u8def\u5f84\u635f\u8017\u6307\u6570<\/span>
\nparams.<\/span>shadowing_std =<\/span> 4<\/span>;<\/span> % \u9634\u5f71\u8870\u843d\u6807\u51c6\u5dee（dB）<\/span>
\nparams.<\/span>fc =<\/span> 2e9<\/span>;<\/span> % \u8f7d\u6ce2\u9891\u7387（Hz）<\/span>
\nparams.<\/span>BW =<\/span> 1e6<\/span>;<\/span> % \u5e26\u5bbd（Hz）<\/span><\/p>\n

2. \u4fe1\u9053\u6a21\u578b<\/h5>\n

\u91c7\u7528\u5757\u8870\u843d\u4fe1\u9053\u6a21\u578b，\u4fe1\u9053\u5728\u957f\u5ea6\u4e3aT\u7b26\u53f7\u7684\u76f8\u5e72\u95f4\u9694\u5185\u4fdd\u6301\u9759\u6001\u3002<\/p>\n

% \u4fe1\u9053\u6a21\u578b<\/span>
\nfunction<\/span> H =<\/span> generate_channel<\/span>(<\/span>N_tx,<\/span> N_rx,<\/span> path_loss_exp,<\/span> shadowing_std)<\/span>
\n % \u751f\u6210\u745e\u5229\u8870\u843d\u4fe1\u9053<\/span>
\n H =<\/span> (<\/span>randn<\/span>(<\/span>N_rx,<\/span> N_tx)<\/span> +<\/span> 1j<\/span>*<\/span>randn<\/span>(<\/span>N_rx,<\/span> N_tx)<\/span>)<\/span> \/<\/span> sqrt<\/span>(<\/span>2<\/span>)<\/span>;<\/span>
\n % \u5e94\u7528\u8def\u5f84\u635f\u8017\u548c\u9634\u5f71\u8870\u843d<\/span>
\n path_loss =<\/span> 10<\/span>^<\/span>(<\/span>–<\/span>path_loss_exp \/<\/span> 10<\/span>)<\/span>;<\/span>
\n shadowing =<\/span> 10<\/span>^<\/span>(<\/span>shadowing_std *<\/span> (<\/span>randn<\/span>(<\/span>N_rx,<\/span> 1<\/span>)<\/span> \/<\/span> sqrt<\/span>(<\/span>2<\/span>)<\/span>)<\/span>)<\/span>;<\/span>
\n H =<\/span> H .*<\/span> (<\/span>path_loss *<\/span> shadowing)<\/span>;<\/span>
\nend<\/span><\/p>\n

3. \u529f\u7387\u63a7\u5236\u7b97\u6cd5<\/h5>\n

\u57fa\u4e8eSINR\u7684\u95ed\u73af\u529f\u7387\u63a7\u5236\u7b97\u6cd5\u3002<\/p>\n

% \u529f\u7387\u63a7\u5236\u7b97\u6cd5<\/span>
\nfunction<\/span> pwr =<\/span> power_control<\/span>(<\/span>snr_current,<\/span> pwr_prev,<\/span> target_snr,<\/span> max_pwr)<\/span>
\n if<\/span> isempty<\/span>(<\/span>pwr_prev)<\/span>
\n pwr =<\/span> min<\/span>(<\/span>max_pwr,<\/span> 10<\/span>^<\/span>(<\/span>target_snr\/<\/span>10<\/span>)<\/span>)<\/span>;<\/span> % \u521d\u59cb\u529f\u7387\u8bbe\u4e3a\u76ee\u6807SINR\u5bf9\u5e94\u503c<\/span>
\n else<\/span>
\n error =<\/span> target_snr –<\/span> snr_current;<\/span>
\n pwr =<\/span> pwr_prev +<\/span> 0.5<\/span> *<\/span> error;<\/span>
\n pwr =<\/span> max<\/span>(<\/span>min<\/span>(<\/span>pwr,<\/span> max_pwr)<\/span>,<\/span> 0<\/span>)<\/span>;<\/span> % \u9650\u5236\u529f\u7387\u8303\u56f4<\/span>
\n end<\/span>
\nend<\/span><\/p>\n

4. \u4eff\u771f\u4e3b\u5faa\u73af<\/h5>\n

\u4eff\u771f\u5927\u89c4\u6a21MIMO\u7cfb\u7edf\u4e2d\u7684\u5355\u64ad\u548c\u591a\u64ad\u4f20\u8f93\u3002<\/p>\n

% \u4eff\u771f\u4e3b\u5faa\u73af<\/span>
\nsnr_history =<\/span> zeros<\/span>(<\/span>params.<\/span>d2d_pairs,<\/span> 100<\/span>)<\/span>;<\/span> % \u8bb0\u5f55SINR\u5386\u53f2<\/span>
\npower_history =<\/span> zeros<\/span>(<\/span>params.<\/span>d2d_pairs,<\/span> 100<\/span>)<\/span>;<\/span><\/p>\n

for<\/span> iter =<\/span> 1<\/span>:<\/span>100<\/span>
\n for<\/span> pair_idx =<\/span> 1<\/span>:<\/span>params.<\/span>d2d_pairs
\n % \u751f\u6210\u4fe1\u9053<\/span>
\n H =<\/span> generate_channel<\/span>(<\/span>params.<\/span>N_tx,<\/span> params.<\/span>N_rx,<\/span> params.<\/span>path_loss_exp,<\/span> params.<\/span>shadowing_std)<\/span>;<\/span>
\n % \u8ba1\u7b97\u5f53\u524dSINR<\/span>
\n snr_current =<\/span> calculate_snr<\/span>(<\/span>H,<\/span> power_history<\/span>(<\/span>pair_idx,<\/span> iter–<\/span>1<\/span>)<\/span>,<\/span> params.<\/span>noise_power)<\/span>;<\/span>
\n % \u66f4\u65b0\u53d1\u5c04\u529f\u7387<\/span>
\n power_history<\/span>(<\/span>pair_idx,<\/span> iter)<\/span> =<\/span> power_control<\/span>(<\/span>snr_current,<\/span> power_history<\/span>(<\/span>pair_idx,<\/span> iter–<\/span>1<\/span>)<\/span>,<\/span> params.<\/span>target_snr,<\/span> params.<\/span>ptx_max)<\/span>;<\/span>
\n % \u8bb0\u5f55SINR<\/span>
\n snr_history<\/span>(<\/span>pair_idx,<\/span> iter)<\/span> =<\/span> snr_current;<\/span>
\n end<\/span>
\nend<\/span><\/p>\n

5. \u6027\u80fd\u5206\u6790<\/h5>\n

\u5206\u6790SINR\u6536\u655b\u6027\u548c\u53d1\u5c04\u529f\u7387\u5206\u5e03\u3002<\/p>\n

% SINR\u6536\u655b\u6027<\/span>
\nfigure;<\/span>
\nplot<\/span>(<\/span>snr_history'<\/span>)<\/span>;<\/span>
\nxlabel<\/span>(<\/span>'\u8fed\u4ee3\u6b21\u6570'<\/span>)<\/span>;<\/span>
\nylabel<\/span>(<\/span>'SINR (dB)'<\/span>)<\/span>;<\/span>
\ntitle<\/span>(<\/span>'D2D\u7528\u6237SINR\u6536\u655b\u6027'<\/span>)<\/span>;<\/span>
\nlegend<\/span>(<\/span>arrayfun<\/span>(<\/span>@<\/span>(<\/span>x)<\/span> sprintf<\/span>(<\/span>'D2D\u5bf9%d'<\/span>,<\/span> x)<\/span>,<\/span> 1<\/span>:<\/span>params.<\/span>d2d_pairs,<\/span> 'UniformOutput'<\/span>,<\/span> false)<\/span>)<\/span>;<\/span>
\ngrid on;<\/span><\/p>\n

% \u53d1\u5c04\u529f\u7387\u5206\u5e03<\/span>
\nfigure;<\/span>
\nhistogram<\/span>(<\/span>power_history<\/span>(<\/span>:<\/span>)<\/span>,<\/span> 0<\/span>:<\/span>params.<\/span>ptx_max\/<\/span>5<\/span>:<\/span>params.<\/span>ptx_max)<\/span>;<\/span>
\nxlabel<\/span>(<\/span>'\u53d1\u5c04\u529f\u7387 (dBm)'<\/span>)<\/span>;<\/span>
\nylabel<\/span>(<\/span>'\u6837\u672c\u6570'<\/span>)<\/span>;<\/span>
\ntitle<\/span>(<\/span>'D2D\u7528\u6237\u53d1\u5c04\u529f\u7387\u5206\u5e03'<\/span>)<\/span>;<\/span>
\nxlim<\/span>(<\/span>[<\/span>0<\/span> params.<\/span>ptx_max]<\/span>)<\/span>;<\/span><\/p>\n

6. \u6269\u5c55\u65b9\u5411<\/h5>\n