Feedback Overhead in the FDD Downlink Massive MIMO System

<table class="table-group" id="tab10"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left"></td><td class="align_center" colspan="4">Number of subcarriers</td></tr><tr class="thead"><td class="align_left"><span style="width: 38.6238ptpx;"><svg height="8.69875pt" id="M490" style="vertical-align:-0.3499298pt" version="1.1" viewbox="-0.0498162 -8.34882 38.6238 8.69875" width="38.6238pt" 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="M384 0V27C293 34 287 42 287 114V635C232 613 172 594 109 583V559L157 557C201 555 205 550 205 499V114C205 42 199 34 109 27V0H384Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><path d="M137 343C167 482 260 545 321 574C357 591 397 603 429 609L423 641C382 634 335 622 295 608C189 570 37 457 37 238C37 84 125 -12 242 -12C362 -12 447 89 447 209C447 311 374 393 267 393C247 393 226 386 204 376L137 343ZM227 337C318 337 361 256 361 173C361 105 336 22 258 22C176 22 126 120 126 240C126 266 127 291 132 310C155 323 189 337 227 337Z"></path></g><g transform="matrix(.013,0,0,-0.013,15.386,0)"><path d="M528 54L331 254L528 455L492 493L294 291L96 493L60 455L257 254L60 54L96 16L294 217L492 16L528 54Z"></path></g><g transform="matrix(.013,0,0,-0.013,25.922,0)"><path d="M384 0V27C293 34 287 42 287 114V635C232 613 172 594 109 583V559L157 557C201 555 205 550 205 499V114C205 42 199 34 109 27V0H384Z"></path></g><g transform="matrix(.013,0,0,-0.013,32.162,0)"><path d="M137 343C167 482 260 545 321 574C357 591 397 603 429 609L423 641C382 634 335 622 295 608C189 570 37 457 37 238C37 84 125 -12 242 -12C362 -12 447 89 447 209C447 311 374 393 267 393C247 393 226 386 204 376L137 343ZM227 337C318 337 361 256 361 173C361 105 336 22 258 22C176 22 126 120 126 240C126 266 127 291 132 310C155 323 189 337 227 337Z"></path></g></svg></span></td><td class="align_center">128</td><td class="align_center">256</td><td class="align_center">512</td><td class="align_center">1024</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">LZW</td><td class="align_center">80.5752%</td><td class="align_center">84.7580%</td><td class="align_center">89.3175%</td><td class="align_center">91.8718%</td></tr><tr><td class="align_left">LZWM</td><td class="align_center">81.8413%</td><td class="align_center">86.1474%</td><td class="align_center">90.0122%</td><td class="align_center">92.6036%</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparisons between LZW and LZWM.</div>

Wireless Communications and Mobile Computing

tab10

Table 10

Table 10: Feedback Overhead in the FDD Downlink Massive MIMO System 