Multiuser Beamforming with Limited Feedback for FDD Massive MIMO Systems

<div>RS transmission model to get <svg height="12.5057pt" id="M149" style="vertical-align:-3.29565pt" version="1.1" viewbox="-0.0498162 -9.21005 27.0593 12.5057" width="27.0593pt" 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="M531 0V32C480 40 474 41 474 105V288C474 398 423 454 336 454C286 454 237 424 203 390V703C143 688 72 674 19 667V637C71 631 75 632 75 571V105C75 41 69 38 12 32V0H249V32C207 38 203 46 203 101V352C225 373 251 380 275 380C314 380 347 354 347 277V101C347 46 344 39 296 32V0H531Z" id="g13-102"></path><glyph.data ascent="1024" descent="-360" horiz-adv-x="550" vert-adv-y="550"></glyph.data></g><g transform="matrix(.013,0,0,-0.013,6.954,0)"><path d="M699 442H515V410C577 401 582 389 573 351C563 308 532 208 517 161H515C476 254 437 345 401 437H362C326 342 293 250 258 163H256C237 225 217 294 197 358C186 392 192 401 250 410V442H3V410C45 405 55 395 71 347C108 235 151 112 191 -11H229C267 84 302 175 340 268C377 177 418 83 457 -11H495C545 129 587 249 623 342C644 394 651 402 699 410V442Z" id="g13-117"></path><glyph.data ascent="1024" descent="-360" horiz-adv-x="683" vert-adv-y="683"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,15.833,3.132)"><path d="M416 501L399 642C356 655 314 665 271 665C140 665 63 582 63 486C63 372 163 325 229 290C304 250 359 217 359 142C359 70 316 25 240 25C138 25 94 125 78 186L44 178C52 123 64 45 72 21C81 16 96 8 121 0S179 -15 220 -15C353 -15 445 68 445 176C445 289 350 335 270 375C191 414 143 449 143 520C143 572 177 627 253 627C340 627 366 556 382 495L416 501Z" id="g58-81"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="484" vert-adv-y="484"></glyph.data></g><g transform="matrix(.0091,0,0,-0.0091,20.238,3.132)"><path d="M618 181C565 77 513 26 413 26C264 26 151 150 151 336C151 486 240 625 407 625C516 625 573 582 600 475L634 483C627 540 622 581 613 638C585 643 518 665 435 665C211 665 46 526 46 315C46 158 157 -15 406 -15C480 -15 564 4 594 12C612 43 638 121 651 168L618 181Z" id="g58-65"></path><glyph.data ascent="1007" descent="-369" horiz-adv-x="673" vert-adv-y="673"></glyph.data></g></svg>.</div>

Chinese Journal of Engineering

fig4

Figure 4

Figure 4: Multiuser Beamforming with Limited Feedback for FDD Massive MIMO Systems 