On the Feasibility of High Speed Railway mmWave Channels in Tunnel Scenario

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Tunnel type [<a href="/journals/wcmc/2017/7135896/#B32">14</a>]</td><td class="align_center">Arched tunnel</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Antenna types</td><td class="align_center">Directional antenna</td></tr><tr><td class="align_left">(Figure <a href="../fig4/">4</a>)</td><td class="align_center">Omnidirectional antenna</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Material of tunnel</td><td class="align_center">Sulphoaluminate cement</td></tr><tr><td class="align_left">Material permittivity</td><td class="align_center"><span style="width: 86.9659ptpx;"><svg height="12.0653pt" id="M61" style="vertical-align:-3.4294pt" version="1.1" viewbox="-0.0498162 -8.6359 86.9659 12.0653" width="86.9659pt" xmlns="http://www.w3.org/2000/svg" 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parameters</td><td class="align_center"><span class="nowrap"><svg height="8.8423pt" id="M62" style="vertical-align:-0.2064009pt" version="1.1" viewbox="-0.0498162 -8.6359 61.7374 8.8423" width="61.7374pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M449 634C442 637 425 643 405 650C376 660 341 666 307 666C181 666 98 590 98 485C98 400 170 343 215 310L246 288C307 243 343 204 343 147C343 67 291 18 219 18C104 18 61 124 51 202L23 199C28 124 27 71 27 47C47 22 122 -16 204 -16C324 -16 428 60 428 174C428 256 379 309 307 360L276 382C223 419 179 455 179 516C179 576 221 632 293 632C379 632 410 564 418 487L448 490C446 536 446 592 449 634Z" id="g113-84"></path></g><g transform="matrix(.013,0,0,-0.013,9.768,0)"><path d="M535 323V373H52V323H535ZM535 138V188H52V138H535Z" id="g117-34"></path></g><g transform="matrix(.013,0,0,-0.013,21.031,0)"><path d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 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238 602Z" id="g113-49"></path></g></svg></td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Tunnel length</td><td class="align_center">1 km</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Heights of TX and RX</td><td class="align_center">6.5 m and 3 m</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Speed of HSR</td><td class="align_center">360 km/h</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">System bandwidth for a link</td><td class="align_center">125 MHz</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Frequency range investigated</td><td class="align_center">31.5 GHz~33.5 GHz</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Transmit power</td><td class="align_center">30 dBm [<a href="/journals/wcmc/2017/7135896/#B6">6</a>]</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Cable loss</td><td class="align_center">6 dB</td></tr><tr><td class="align_left" colspan="2"><hr/></td></tr><tr><td class="align_left">Final channel sample interval</td><td class="align_center">2 mm</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Wireless Communications and Mobile Computing

tab2

Table 2

Table 2: On the Feasibility of High Speed Railway mmWave Channels in Tunnel Scenario 