{"id":6642,"date":"2022-03-16T15:25:26","date_gmt":"2022-03-16T06:25:26","guid":{"rendered":"https:\/\/www11.ieice.org\/cs\/ap\/wp\/?page_id=6642"},"modified":"2025-12-05T18:55:02","modified_gmt":"2025-12-05T09:55:02","slug":"walfisch-ikegami","status":"publish","type":"page","link":"https:\/\/www.ieice.org\/cs\/ap\/misc\/denpan-db\/prop_model_db\/model_list\/walfisch-ikegami\/","title":{"rendered":"Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb"},"content":{"rendered":"
<\/div>

<\/path><\/svg><\/i> \"Loading\"<\/p>

<\/div>(since 2025\/12\/5)<\/p>\n\n\n\n

\u30e2\u30c7\u30eb\u306e\u6982\u8981<\/h3>\n\n\n\n

\u3000\u3053\u306e\u30e2\u30c7\u30eb\u306fCOST\uff08\u6b27\u5dde\u79d1\u5b66\u6280\u8853\u7814\u7a76\u5354\u529b\u6a5f\u69cb\uff09\u3067\u4f5c\u6210\u3055\u308c\u305fCOST 231 Walfisch-Ikegami Model [1,2]\u306e\u3053\u3068\u3067\u3042\u308a\u3001\u30bb\u30eb\u30e9\u30fc\u74b0\u5883\u3067\u306e\u4f1d\u642c\u640d\u3092\u63a8\u5b9a\u3059\u308b\u305f\u3081\u306e\u30e2\u30c7\u30eb\u3067\u3042\u308b\u3002\u3053\u306e\u30e2\u30c7\u30eb\u306f\u591a\u91cd\u30b9\u30af\u30ea\u30fc\u30f3\u56de\u6298\u30e2\u30c7\u30eb[3]\u3068\u6c60\u4e0a\u30e2\u30c7\u30eb[4]\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u308b\u3002\u8857\u306e\u5efa\u7269\u4e0a\u7a7a\u306e\u4f1d\u642c\u306b\u591a\u91cd\u30b9\u30af\u30ea\u30fc\u30f3\u56de\u6298\u30e2\u30c7\u30eb\u3092\u7528\u3044\u3066\u3001\u79fb\u52d5\u5c40\u306b\u96a3\u63a5\u3059\u308b\u5efa\u7269\u5c4b\u4e0a\u304b\u3089\u9053\u8def\u4e0a\u306b\u3042\u308b\u79fb\u52d5\u5c40\u3078\u306e\u4f1d\u642c\u306b\u6c60\u4e0a\u30e2\u30c7\u30eb\u3092\u7528\u3044\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

   \u56f31\u306b\u3053\u306e\u30e2\u30c7\u30eb\u304c\u5bfe\u8c61\u3068\u3059\u308b\u74b0\u5883\u3068\u30d1\u30e9\u30e1\u30fc\u30bf\u53ca\u3073\u9053\u8def\u89d2\u3092\u793a\u3059\u3002\u5efa\u7269\u7fa4\u3092\u8907\u6570\u306e\u5e73\u677f\u306b\u898b\u7acb\u3066\u305f\u591a\u91cd\u30b9\u30af\u30ea\u30fc\u30f3\u56de\u6298\u30e2\u30c7\u30eb\u306e\u74b0\u5883\u3092\u60f3\u5b9a\u3057\u3066\u3044\u308b\u3002\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u8aac\u660e\u3084\u9069\u7528\u7bc4\u56f2\u3001\u5358\u4f4d\u3092(4)\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u8868\u306b\u793a\u3059\u3002<\/p>\n\n\n

\n
\"\"
\u56f31 Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u74b0\u5883\u3068\u30d1\u30e9\u30e1\u30fc\u30bf<\/figcaption><\/figure><\/div>\n\n
\n
\"\"
\u56f32 \u9053\u8def\u89d2\u306e\u5b9a\u7fa9<\/figcaption><\/figure><\/div>\n\n\n

\u6570\u5f0f<\/h3>\n\n\n\n

Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u4f1d\u642c\u640d\u306e\u63a8\u5b9a\u5f0f\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

(1) \u9001\u53d7\u4fe1\u9593\u306b\u898b\u901a\u3057\u304c\u3042\u308b\u5834\u5408\u306e\u4f1d\u642c\u640d\\(L_b\\) [dB]\u306f\u6b21\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L_b = 42.6 + 26 \\log d + 20 \\log f \\quad (d\u226720{\\rm m})
\\tag{1}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001\u5b9a\u6570\u306f\\(d\\)=20m\u306e\u4f1d\u642c\u640d\u304c\u81ea\u7531\u7a7a\u9593\u640d\u3068\u540c\u3058\u306b\u306a\u308b\u3088\u3046\u306b\u6c7a\u3081\u3089\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

(2) \u898b\u901a\u3057\u304c\u306a\u3044\u5834\u5408\u306e\u4f1d\u642c\u640d\\(L_b\\)\u306f\u6b21\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L_b = \\left\\{
\\begin{array}{ll}
L_0 + L_{rts} + L_{msd} & (L_{rts} + L_{msd} > 0) \\\\
L_0 & (L_{rts} + L_{msd} \u2266 0)
\\end{array}
\\right.
\\tag{2}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001\\(L_0\\)\u306f\u81ea\u7531\u7a7a\u9593\u640d\u3067\u3001\\(L_{rts}\\)\u306f\u30d3\u30eb\u5c4b\u4e0a\u304b\u3089\u901a\u308a\u3078\u306e\u56de\u6298\u3068\u6563\u4e71\u306e\u640d\u5931\u3067\u3001\\(L_{msd}\\)\u306f\u591a\u91cd\u30b9\u30af\u30ea\u30fc\u30f3\u56de\u6298\u640d\u5931\u3067\u3042\u308b\u3002\u307e\u305f\u3001\\(L_{rts}+L_{msd}\\)\u306e\u548c\u304c0\u4ee5\u4e0b\u3067\u3042\u308c\u3070\\(L_b=L_0\\)\u3068\u3059\u308b\u3002<\/p>\n\n\n\n

(a) \u81ea\u7531\u7a7a\u9593\u640d\\(L_0\\)\u306f\u6b21\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L_0 = 32.4 + 20 \\log d + 20 \\log f
\\tag{3}
\\)<\/p>\n\n\n\n

(b) \u30d3\u30eb\u5c4b\u4e0a\u304b\u3089\u901a\u308a\u3078\u306e\u56de\u6298\u3068\u6563\u4e71\u306e\u640d\u5931\\(L_{rts}\\)\u306f\u6b21\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L_{rts} = \u2212 16.9 \u2212 10 \\log w + 10 \\log f + 20 \\log \\Delta h_{Mobile} + L_{ori}
\\tag{4}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001\u9053\u8def\u89d2\u7279\u6027\\(L_{ori}\\)\u3084\\(\\Delta h_{Mobile}\\)\u3001\\(\\Delta h_{Base}\\)\u306f\u6b21\u5f0f\u306e\u3068\u304a\u308a\u3002<\/p>\n\n\n\n

\\(
L_{ori} = \\left\\{
\\begin{array}{ll}
\u2212 10 + 0.354 \\varphi & (0\u2266\\varphi<35\u00b0) \\\\
2.5 + 0.075 (\\varphi \u2212 35) & (35\u00b0\u2266\\varphi<55\u00b0) \\\\
4.0 \u2212 0.114 (\\varphi \u2212 55) & (55\u00b0\u2266\\varphi\u226690\u00b0)
\\end{array}
\\right.
\\tag{5}
\\)<\/p>\n\n\n\n

\\(
\\Delta h_{Mobile} = h_{Roof} – h_{Mobile}
\\tag{6}
\\)
\\(
\\Delta h_{Base} = h_{Base} – h_{Roof}
\\tag{7}
\\)<\/p>\n\n\n\n

(c) \u591a\u91cd\u30b9\u30af\u30ea\u30fc\u30f3\u56de\u6298\u640d\\(L_{msd}\\)\u306f\u6b21\u5f0f\u3067\u8868\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\\(
L_{msd} = L_{bah} + k_a + k_d \\log d + k_f \\log f \u2212 9 \\log b
\\tag{8}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001\u57fa\u5730\u5c40\u9ad8\u7279\u6027\\(L_{bah}\\)\u3068\\(k_a\\)\u306f\u6b21\u306e\u3068\u304a\u308a\u3002<\/p>\n\n\n\n

\\(
L_{bah} = \\left\\{
\\begin{array}{ll}
\u2212 18 \\log (1+\\Delta h_{Base}) & (h_{Base}>h_{Roof}) \\\\
0 & (h_{Base}\u2266h_{Roof})
\\end{array}
\\right.
\\tag{9}
\\)<\/p>\n\n\n\n

\\(
k_a = \\left\\{
\\begin{array}{ll}
54 & (h_{Base}>h_{Roof}) \\\\
54 \u2212 0.8 \\Delta h_{Base} & (d\u22670.5{\\rm km \u304b\u3064} h_{Base}\u2266h_{Roof}) \\\\
54 \u2212 0.8 \\Delta h_{Base} \\frac{d}{0.5} & (d<0.5{\\rm km \u304b\u3064} h_{Base}\u2266h_{Roof})
\\end{array}
\\right.
\\tag{10}
\\)<\/p>\n\n\n\n

\u8ddd\u96e2\u7279\u6027\\(k_d\\)\u306f\u6b21\u306e\u3068\u304a\u308a\u3002<\/p>\n\n\n\n

\\(
k_d = \\left\\{
\\begin{array}{ll}
18 & (h_{Base}>h_{Roof}) \\\\
18 \u2212 15 \\frac{\\Delta h_{Base}}{h_{Roof}} & (h_{Base}\u2266h_{Roof})
\\end{array}
\\right.
\\tag{11}
\\)<\/p>\n\n\n\n

\u5468\u6ce2\u6570\u7279\u6027\\(k_f\\)\u306f\u6b21\u306e\u3068\u304a\u308a\u3002<\/p>\n\n\n\n

\\(
k_f = \\left\\{
\\begin{array}{ll}
\u2212 4 + 0.7(\\frac{f}{925} \u2212 1) & (\u4e2d\u5c0f\u90fd\u5e02\u3001\u90ca\u5916\u5730)^{\u203b1} \\\\
\u2212 4 + 1.5(\\frac{f}{925} \u2212 1) & (\u5927\u90fd\u5e02)^{\u203b2}
\\end{array}
\\right.
\\tag{12}
\\)<\/p>\n\n\n\n

\u3000\u203b1\uff1a\u4e2d\u90fd\u5e02\u3068\u9069\u5ea6\u306a\u6a39\u6728\u5bc6\u5ea6\u306e\u3042\u308b\u90ca\u5916\u306e\u4e2d\u5fc3\u90e8
\u3000\u203b2\uff1a\u5927\u90fd\u5e02\u306e\u4e2d\u5fc3\u90e8<\/p>\n\n\n\n

\uff1c Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u4f1d\u642c\u640d\u7279\u6027\uff1e<\/p>\n\n\n\n

\u30fbCOST 231\u306e\u5831\u544a\u66f8\u306b\u306f\u3001”\\(h_{Base}\u226bh_{Roof}\\)\u306e\u5834\u5408\u306b\u6bd4\u3079\u3066\\(h_{Base}\u2252h_{Roof}\\)\u306e\u63a8\u5b9a\u8aa4\u5dee\u306f\u5927\u304d\u304f\u3001\u3055\u3089\u306b\\(h_{Base}\u226ah_{Roof}\\)\u306e\u8aa4\u5dee\u306f\u5927\u304d\u3044\u306e\u3067\u3001\u30de\u30a4\u30af\u30ed\u30bb\u30eb\u3067\u306e\u8aa4\u5dee\u306f\u975e\u5e38\u306b\u5927\u304d\u3044\u304b\u3082\u3057\u308c\u306a\u3044”\u3001\u3068\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u30fb\u4f1d\u642c\u640d\u306e\u5468\u6ce2\u6570\u7279\u6027\u3092\\(\\alpha \\log f\\)\u3068\u8868\u73fe\u3057\u305f\u3068\u304d\u306e\\(\\alpha\\)\u3092\u5468\u6ce2\u6570\u4fc2\u6570\u3068\u3059\u308b\u3002\u3053\u306e\u30e2\u30c7\u30eb\u306e\u5468\u6ce2\u6570\u4fc2\u6570\u306f\u3001800\uff5e2000MHz\u306b\u5bfe\u3057\u306626\uff5e28\u3067\u3042\u308b\u3002\u307e\u305f\u3001\u3053\u306e\u5024\u306f\u5965\u6751-\u79e6\u5f0f\u306e26\u306b\u8fd1\u3044\u5024\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fb\u540c\u69d8\u306b\u8ddd\u96e2\u4fc2\u6570\u306f\u3001\u57fa\u5730\u5c40\u9ad8\u304c\u5e73\u5747\u30d3\u30eb\u9ad8\u3088\u308a\u9ad8\u3044\u3068\u304d\u306f38\u3067\u3042\u308b\u3002\u57fa\u5730\u5c40\u9ad8\u304c\u5e73\u5747\u30d3\u30eb\u9ad8\u3088\u308a\u4f4e\u3044\u3068\u304d\u306f\u3001\u4f8b\u3048\u3070\\(h_{Base}=h_{Roof}\/2\\)\u3067\\(d\\)>0.5km\u306e\u3068\u304d\u306f45.5\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fb\u57fa\u5730\u5c40\u9ad8\u7279\u6027\u306f\u3001\u57fa\u5730\u5c40\u9ad8\u304c\u5e73\u5747\u30d3\u30eb\u9ad8\u3088\u308a\u9ad8\u3044\u3068\u304d\u306f\u3001\\(\u221218 \\log (1+\\Delta h_{Base})\\)\u3067\u3042\u308b\u3002\u4f8b\u3048\u3070\\(\\Delta h_{Base}\\)\u304c0m\u304b\u308910m\u306b\u306a\u308b\u3068\u640d\u5931\u306f\u221219dB\u5909\u5316\u3059\u308b\u3002\uff08\u5b9f\u74b0\u5883\u3067\u306f\u3053\u306e\u3088\u3046\u306a\u6025\u6fc0\u306a\u5909\u5316\u306f\u8d77\u304d\u306b\u304f\u3044\u3002\uff09<\/p>\n\n\n\n

\u30fb\u56f33\u306bWalfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u4f1d\u642c\u640d\u3092\u793a\u3059\u3002\u5e73\u5747\u30d3\u30eb\u9ad8\u304c30m\u306e\u3068\u304d\u306b\u3001\u57fa\u5730\u5c40\u9ad8\u309210, 30, 50m\u3068\u5909\u3048\u305f\u3002\u30d1\u30e9\u30e1\u30fc\u30bf\u5024\u3092\u56f33\u4e2d\u306b\u793a\u3059\u3002<\/p>\n\n\n\n

\u30fb\u57fa\u5730\u5c40\u9ad810m\u306e\u4f1d\u642c\u640d\u306e\u50be\u304d\u304c0.5km\u3067\u5909\u308f\u308b\u306e\u306f\u3001\\(k_a\\)\u306e\u5f71\u97ff\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fb\u56f34\u306bWalfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u3068\u5965\u6751-\u79e6\u5f0f\u306e\u6bd4\u8f03\u3092\u793a\u3059\u3002Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u4f1d\u642c\u640d\u306f\u56f33\u3068\u540c\u3058\u3067\u3042\u308b\u3002\u5965\u6751-\u79e6\u5f0f\u3067\u306f\u540c\u3058\u5468\u6ce2\u6570\u3068\u79fb\u52d5\u5c40\u9ad8\u3092\u7528\u3044\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u30fb\u57fa\u5730\u5c40\u9ad850m\u3067\u306f\u4e21\u8005\u306f\u8fd1\u3044\u5024\u3067\u3042\u308b\u304c\u300130m\u3067\u306f20dB\u3082\u7570\u306a\u308b\u3002Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u57fa\u5730\u5c40\u9ad830m\u306850m\u306e\u5dee\u304c\u5927\u304d\u3044\u306e\u306f\u3001\u57fa\u5730\u5c40\u9ad8\u3068\u5e73\u5747\u30d3\u30eb\u9ad8\u3068\u306e\u5dee\\(\\Delta h_{Base}\\)\u3092\u57fa\u5730\u5c40\u9ad8\u7279\u6027\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u7528\u3044\u3066\u3044\u308b\u305f\u3081\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fb\u56f35\u306b\u9053\u8def\u89d2\u7279\u6027\u3092\u793a\u3059\u3002\u9053\u8def\u89d20\u00ba \u306f\u7e26\u30b3\u30fc\u30b9\u300190\u00ba \u306f\u6a2a\u30b3\u30fc\u30b9\u3067\u3042\u308b\u3002\u5965\u6751\u30e2\u30c7\u30eb\u306e\u7e26\u30b3\u30fc\u30b9\u3068\u6a2a\u30b3\u30fc\u30b9\u306e\u5dee\u306f\u8ddd\u96e25km\u306712dB\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u30fb\u9053\u8def\u89d2\u304c90\u00ba \u306e\u3068\u304d\u306b\u640d\u5931\u304c\u6700\u5927\u306b\u306a\u308b\u3088\u3046\u306b\u601d\u308f\u308c\u308b\u304c\u3001\u3053\u306e\u30e2\u30c7\u30eb\u3067\u306f55\u00ba\u3067\u6700\u5927\u306b\u306a\u308b\u3002\u6a2a\u30b3\u30fc\u30b9\u306e\u9053\u8def\u306f\u7e26\u30b3\u30fc\u30b9\u306e\u9053\u8def\u3068\u4ea4\u5dee\u3059\u308b\u3002\u4ea4\u5dee\u70b9\u5185\u306f\u7e26\u30b3\u30fc\u30b9\u3092\u4f1d\u642c\u3059\u308b\u5f37\u3044\u96fb\u6ce2\u3092\u53d7\u4fe1\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3002\u3053\u308c\u306b\u3088\u308a\u6a2a\u30b3\u30fc\u30b9\u306e\u5e73\u5747\u306e\u640d\u5931\u306f\u5c0f\u3055\u304f\u306a\u308b\u3068\u8003\u3048\u3089\u308c\u308b\u3002<\/p>\n\n\n\n

\u30fbWalfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u3092\u57fa\u306b\u3057\u3066\u5909\u66f4\u3092\u52a0\u3048\u305f\u30e2\u30c7\u30eb\u304c\u5e7e\u3064\u304b\u63d0\u6848\u3055\u308c\u3066\u3044\u308b\u3002\u4f8b\u3048\u3070\u3001ITU-R P1411[5]\u304c\u3042\u308a\u3001\u6587\u732e[6]\u3067\u7d39\u4ecb\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u30fb\u53c2\u8003\u307e\u3067\u306b\u3001\u6587\u732e[7]\u3067\u6c60\u4e0a\u30e2\u30c7\u30eb[4]\u306e\u5f0f\u306b\u53cd\u5c04\u4fc2\u6570\u306e\u8a18\u8ff0\u30df\u30b9\u304c\u3042\u308b\u3053\u3068\u304c\u793a\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n

\u30d1\u30e9\u30e1\u30fc\u30bf<\/h3>\n\n\n\n

\u5404\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u610f\u5473\u3068\u9069\u7528\u7bc4\u56f2\u306f\u6b21\u306e\u3068\u304a\u308a\u3002<\/p>\n\n\n\n

\u8a18\u53f7<\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e[\u5358\u4f4d]<\/td>\u9069\u7528\u7bc4\u56f2<\/td><\/tr>
\\(f\\)<\/td>\u5468\u6ce2\u6570 [MHz]<\/td>800\uff5e2000 MHz<\/td><\/tr>
\\(h_{Base}\\)<\/td>\u57fa\u5730\u5c40\u30a2\u30f3\u30c6\u30ca\u9ad8 [m]<\/td>4\uff5e50 m<\/td><\/tr>
\\(h_{Mobile}\\)<\/td>\u79fb\u52d5\u5c40\u30a2\u30f3\u30c6\u30ca\u9ad8 [m]<\/td>1\uff5e3 m<\/td><\/tr>
\\(d\\)<\/td>\u9001\u53d7\u4fe1\u9593\u8ddd\u96e2 [km]<\/td>0.02\uff5e5 km<\/td><\/tr><\/tbody><\/table>
\u203b\u56f31\u306e\u89d2\u5ea6\\(\\alpha\\)\u306f\u6587\u732e1\u30682\u306b\u63cf\u304b\u308c\u3066\u3044\u308b\u304c\u3001\u63a8\u5b9a\u306b\u306f\u7528\u3044\u3089\u308c\u306a\u3044\u3002<\/figcaption><\/figure>\n\n\n\n

\u30d3\u30eb\u3068\u9053\u8def\u306e\u69cb\u9020\u304c\u660e\u3089\u304b\u3067\u306a\u3044\u3068\u304d\u306f\u6b21\u306e\u5024\u304c\u63a8\u5968\u3055\u308c\u308b\u3002<\/p>\n\n\n\n

\u8a18\u53f7<\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e[\u5358\u4f4d]<\/td>\u63a8\u5968\u5024<\/td><\/tr>
\\(b\\)<\/td>\u30d3\u30eb\u9593\u9694 [m]\u3000<\/td>20\uff5e50 m<\/td><\/tr>
\\(w\\)<\/td>\u9053\u8def\u5e45 [m]<\/td>\\(b\\)\/2<\/td><\/tr>
\\(h_{Roof}\\)<\/td>\u5e73\u5747\u30d3\u30eb\u9ad8 [m]<\/td>3 m\u00d7\u968e\u6570+\\(roof\\)<\/td><\/tr>
\\(roof\\)<\/td>\u5c4b\u6839\u306e\u5f62\u72b6<\/td>3 m\uff08\u50be\u659c\u306e\u5c4b\u6839\uff09
0 m\uff08\u5e73\u3089\u306a\u5c4b\u6839\uff09<\/td><\/tr>
\\(\\varphi\\)<\/td>\u9053\u8def\u89d2 [\u00b0]<\/td>90\u00b0<\/td><\/tr><\/tbody><\/table>
\u203b\u5bfe\u8c61\u5730\u57df\u306e\u5e73\u5747\u30d3\u30eb\u9ad8\u3084\u30d3\u30eb\u9593\u9694\u3092\u7b97\u51fa\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306e\u8a18\u8f09\u306f\u306a\u3044\u3002
\u203b\u50be\u659c\u306e\u5c4b\u6839\u306f\u6c11\u5bb6\u3092\u60f3\u5b9a\u3057\u3066\u3044\u308b\u3068\u601d\u308f\u308c\u308b\u3002<\/figcaption><\/figure>\n\n\n\n

\u8a08\u7b97\u4f8b<\/h3>\n\n\n
\n
\"\"
\u56f33 Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u306e\u4f1d\u642c\u640d<\/figcaption><\/figure><\/div>\n\n
\n
\"\"
\u56f34 Walfisch-\u6c60\u4e0a\u30e2\u30c7\u30eb\u3068\u5965\u6751-\u79e6\u5f0f\u306e\u6bd4\u8f03<\/figcaption><\/figure><\/div>\n\n
\n
\"\"
\u56f35 \u9053\u8def\u89d2\u7279\u6027<\/figcaption><\/figure><\/div>\n\n\n

\u30d7\u30ed\u30b0\u30e9\u30e0\u4f8b<\/h3>\n\n\n\n

\u5f0f(1)\uff5e(12)\u3092\u30a8\u30af\u30bb\u30eb\u3067\u8a08\u7b97\u3059\u308b\u5834\u5408\u306e\u6570\u5f0f\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3001\u300c=\u300d\u4ee5\u964d\u306e\u6570\u5f0f\u3092\u30a8\u30af\u30bb\u30eb\u306e\u30bb\u30eb\u306b\u5165\u529b\u3057\u3066\u3001\u5909\u6570\u3092\u6570\u5024\u306b\u76f4\u3059\u3068\u8a08\u7b97\u7d50\u679c\u304c\u5f97\u3089\u308c\u308b\u3002<\/p>\n\n\n\n

(1)  Lb=42.6+26*log(d)+20*log(f)                                         (d\u226720m)<\/p>\n\n\n\n

(2)  Lb=L0+Lrts+Lmsd                                                           (Lrts+Lmsd>0)<\/p>\n\n\n\n

           =L0                                                                               (Lrts+Lmsd\u22660)<\/p>\n\n\n\n

(3)  L0=32.4+20*log(d)+20*log(f)<\/p>\n\n\n\n

(4)  Lrts=-16.9-10*log(w)+10*log(f)+20*log(\u0394hm)+Lori   <\/p>\n\n\n\n

(5)  Lori=-10+0.354*\u03c6\u3000\u3000\u3000   \u3000                                           \u3000 (0\u2266\u03c6< 35\u00b0)<\/p>\n\n\n\n

             =2.5+0.075*(\u03c6-35)                                                      (35\u00b0\u2266\u03c6< 55\u00b0)<\/p>\n\n\n\n

             =4.0-0.114*(\u03c6-55)                                                       (55\u00b0 \u2266 \u03c6 \u2266 90\u00b0)<\/p>\n\n\n\n

(6)  \u0394hm=hr-hm  \u3000<\/p>\n\n\n\n

(7)  \u0394hb=hb-hr  <\/p>\n\n\n\n

(8)  Lmsd=Lbah+ka+kd*log(d)+kf*log(f)-9*log(b)<\/p>\n\n\n\n

(9)  Lbah=-18*log(1+\u0394hb)                                                     (hb>hr)<\/p>\n\n\n\n

               =0                                                                             (hb\u2266hr)\u3000<\/p>\n\n\n\n

(10)  ka=54\u3000\u3000                                                                        (hb>hr)<\/p>\n\n\n\n

            =54-0.8*\u0394hb                                                               (d\u22670.5km\u304b\u3064hb\u2266hr) <\/p>\n\n\n\n

            =54-0.8*\u0394hb*d\/0.5                                                     (d<0.5km\u304b\u3064hb\u2266hr)<\/p>\n\n\n\n

(11)  kd=18                                                                              (hb>hr)<\/p>\n\n\n\n

            =18-15*\u0394hb\/hr                                                            (hb\u2266hr)<\/p>\n\n\n\n

(12)  kf=-4+0.7*(f\/925 \u2212 1)                                                     (\u4e2d\u5c0f\u90fd\u5e02\u3001\u90ca\u5916\u5730)<\/p>\n\n\n\n

            =-4+1.5*(f\/925 \u22121)                                                      (\u5927\u90fd\u5e02)<\/p>\n\n\n\n

\u53c2\u7167<\/h2>\n\n\n\n[1] COST 231-Walfisch-Ikegami-Model, 4.4 Propagation Models for Macro-Cells, Digital mobile radio towards future generation systems, COST 231 Final Report, pp. 135-140,<\/p>\n\n\n\n

      http:\/\/www.lx.it.pt\/cost231\/final_report.htm<\/p>\n\n\n\n[2] \u201cUrban transmission loss models for mobile radio in the 900 and 1,800-MHz bands, \u201dEURO-COST (90) 119 Rev2. Sep. 1991.<\/p>\n\n\n\n[3] J. Walfisch and H. L. Bertoni, \u201cA theoretical model of UHF propagation in urban environment, \u201dIEEE Trans. Antennas Propagat., AP-36, no.12, pp.1788-1796, Dec. 1988.<\/p>\n\n\n\n[4] F. Ikegami, S. Yoshida, T. Takeuchi, and M. Umehira, \u201cPropagation factors controlling mean field strength on urban streets, \u201dIEEE Trans. Antennas Propagat., AP-32, no.8, pp.822-829, Aug. 1984.<\/p>\n\n\n\n[5] Rec. ITU-R P.1411-11, “Propagation data and prediction methods for the planning of short-range outdoor radiocommunication systems and radio local area networks in the frequency range 300 MHz to 100 GHz”, ITU-R, 2021.<\/p>\n\n\n\n[6] \u5ca9\u4e95\u8aa0\u4eba\u3001\u79fb\u52d5\u901a\u4fe1\u306b\u304a\u3051\u308b\u96fb\u6ce2\u4f1d\u642c \uff0d\u7121\u7dda\u901a\u4fe1\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u305f\u3081\u306e\u57fa\u790e\u77e5\u8b58\uff0d\u3001\u6771\u4eac\u3001\u30b3\u30ed\u30ca\u793e\u30012012.<\/p>\n\n\n\n[7] D. Har, A. M. Watson, and A. G. Chadney, \u201cComment on diffraction loss of rooftop-to-street in COST 231-Walfisch-Ikegami Model, \u201dIEEE Trans. on Vehicular Technology, vol.48, no.5, pp.1451-1452, Sep. 1999.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30e2\u30c7\u30eb\u306e\u6982\u8981 \u3000\u3053\u306e\u30e2\u30c7\u30eb\u306fCOST\uff08\u6b27\u5dde\u79d1\u5b66\u6280\u8853\u7814\u7a76\u5354\u529b\u6a5f\u69cb\uff09\u3067\u4f5c\u6210\u3055\u308c\u305fCOST 231 Walfisch-Ikegami Model [1,2]\u306e\u3053\u3068\u3067\u3042\u308a\u3001\u30bb\u30eb\u30e9\u30fc\u74b0\u5883\u3067\u306e\u4f1d\u642c\u640d\u3092\u63a8\u5b9a\u3059\u308b\u305f\u3081\u306e\u30e2\u30c7\u30eb\u3067\u3042\u308b\u3002\u3053\u306e […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":12073,"menu_order":24,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-6642","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/6642","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/comments?post=6642"}],"version-history":[{"count":29,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/6642\/revisions"}],"predecessor-version":[{"id":14877,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/6642\/revisions\/14877"}],"up":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/12073"}],"wp:attachment":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/media?parent=6642"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}