NDLI: Uplink downlink balancing using variable feedback rates

Content Provider	IEEE Xplore Digital Library
Author	Bergel, I. Yellin, D. Shamai, S.
Copyright Year	2012
Description	Author affiliation: Technion-Israel Institute of Technology, Haifa, Israel (Shamai, S.) \|\| Faculty of Engineering., Bar-Ilan University, Ramat-Gan, Israel (Bergel, I.) \|\| Marvell Semiconductor Israel, Petach-Tikva, Israel (Yellin, D.)
Abstract	The broadcast MIMO channel have gained much attention in recent years, and in particular in the context of cooperative multi cell transmission in cellular networks. Broadcast MIMO techniques can signifcantly increase the capacity in the downlink of cellular networks, at the price of channel state information (CSI) feedback from the mobiles. Thus, it creates a mechanism that can tradeoff uplink rate to downlink rate. In this work we quantify this tradeoff between the feedback rate (over the uplink) and the downlink rate. We show that uplink rate can be exchanged to downlink rate with a constant exchange ratio. This exchange ratio is an increasing function of the channel coherence time, and a decreasing function of the number of measured BSs. We also show that devoting a constant ratio of the uplink to CSI feedback can increase the downlink multiplexing gain continuously from 0 to 1. This capability to control the balance between the uplink and downlink rates is very important in cellular networks, where the operators need to respond to continuously changing user demands.
Starting Page	1
Ending Page	4
File Size	237327
Page Count	4
File Format	PDF
ISBN	9781467346825
e-ISBN	9781467346818
DOI	10.1109/EEEI.2012.6377108
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-11-14
Publisher Place	Israel
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Downlink MIMO Mobile communication Quantization Interference Fading
Content Type	Text
Resource Type	Article

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