CSI Feedback Scaling Rate vs Multiplexing Gain Tradeoff for DPC-based Transmission in the Gaussian MIMO Broadcast Channel

被引：6

作者：

Vaze, Chinmay S. ^{[1
]}

Varanasi, Mahesh K. ^{[1
]}

机构：

[1] Univ Colorado, Dept Elect Comp & Energy Engn, Boulder, CO 80309 USA

来源：

2010 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY | 2010年

关键词：

Broadcast channel; dirty paper coding; inflation factor; LIMITED FEEDBACK; CAPACITY; TRANSMITTER;

D O I：

10.1109/ISIT.2010.5513701

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

The operation of the multiple input multiple output (MIMO) Gaussian broadcast channel (BC) with K transmit antennas and K/r users with r receive antennas each is analyzed when channel state information (CSI) is obtained at the transmitter from the i(th) user via finite-rate feedback link of capacity B-i bits. It is proved that if Bi is scaled at the rate of alpha(i)r(K - r) log(2) P, where P is the transmit power and alpha(i) is an element of [0, 1], then using dirty paper coding (DPC), the multiplexing gain of air can be achieved for user i. This result on the feedback scaling rate rests on an elegant achievability scheme, the construction of which brings to light several new insights on the manner in which DPC achieves the complete multiplexing gain in the perfect-CSIT case.

引用

页码：2353 / 2357

页数：5