Paper Info
Title
MIMO Relaying Broadcast Channels With Linear Precoding and Quantized Channel State Information Feedback
Abstract
Multi-antenna relaying has emerged as a promising technology to enhance the system performance in cellular networks. However, when precoding techniques are utilized to obtain multi-antenna gains, the system generally requires channel state information (CSI) at the transmitters. We consider a linear precoding scheme in a MIMO relaying broadcast channel with quantized CSI feedback from both two-hop links. With this scheme, each remote user feeds back its quantized CSI to the relay, and the relay sends back the quantized precoding information to the base station (BS). An upper bound on the rate loss due to quantized channel knowledge is first characterized. Then, in order to maintain the rate loss within a predetermined gap for growing SNRs, a strategy of scaling quantization quality of both two-hop links is proposed. It is revealed that the numbers of feedback bits of both links should scale linearly with the transmit power at the relay, while only the bit number of feedback from the relay to the BS needs to grow with the increasing transmit power at the BS. Numerical results are provided to verify the proposed strategy for feedback quality control.
Year
DOI
Venue
2012
10.1109/TSP.2010.2056687
Signal Processing, IEEE Transactions
Keywords
DocType
Volume
mimo relaying broadcast channel,base station,multiantenna relaying,channel state information,broadcast channels,linear codes,mimo relaying broadcast channels,cellular radio,precoding,quantized channel knowledge,quantized precoding information,quantized feedback,multiple-input multiple-output (mimo),quantized channel state information feedback,quantized csi feedback,rate loss,transmitters,two-hop link,antenna arrays,amplify-and-forward relay,quantized csi,mimo communication,feedback bit,feedback quality control,multiantenna gains,upper bound,snr,linear precoding scheme,cellular networks,two-hop links,quantized channel state information,linear precoding,system performance,mimo,signal to noise ratio,downlink,quantization,quality control,cellular network
Journal
abs/1205.2450
Issue
ISSN
Citations 
10
1053-587X
37
PageRank 
References 
Authors
1.47
26
3
Name
Order
Citations
PageRank
Wei Xu185463.23
Xiaodai Dong295885.45
Wu-Sheng Lu329624.90