243 citations · 573 across the 28 of their papers we have counts for
9 papers · 1 filter
How Many Users should be Turned On in a Multi-Antenna Broadcast Channel?
Wei Dai, Youjian, Liu +2
This paper considers broadcast channels with L antennas at the base station and m single-antenna users, where L and m are typically of the same order. We assume that only partial c…
Joint Beamforming for Multiaccess MIMO Systems with Finite Rate Feedback
Wei Dai, Brian C. Rider, Youjian Liu
This paper considers multiaccess multiple-input multiple-output (MIMO) systems with finite rate feedback. The goal is to understand how to efficiently employ the given finite feedb…
Unequal dimensional small balls and quantization on Grassmann Manifolds
Wei Dai, Brian Rider, Youjian Liu
The Grassmann manifold G_{n,p}(L) is the set of all p-dimensional planes (through the origin) in the n-dimensional Euclidean space L^{n}, where L is either R or C. This paper consi…
Quantization Bounds on Grassmann Manifolds of Arbitrary Dimensions and MIMO Communications with Feedback
Wei Dai, Youjian Liu, Brian Rider
This paper considers the quantization problem on the Grassmann manifold with dimension n and p. The unique contribution is the derivation of a closed-form formula for the volume of…
Multi-Access MIMO Systems with Finite Rate Channel State Feedback
Wei Dai, Brian Rider, Youjian Liu
This paper characterizes the effect of finite rate channel state feedback on the sum rate of a multi-access multiple-input multiple-output (MIMO) system. We propose to control the…
Effect of Finite Rate Feedback on CDMA Signature Optimization and MIMO Beamforming Vector Selection
Wei Dai, Youjian Liu, Brian Rider
We analyze the effect of finite rate feedback on CDMA (code-division multiple access) signature optimization and MIMO (multi-input-multi-output) beamforming vector selection. In CD…
On the Information Rate of MIMO Systems with Finite Rate Channel State Feedback Using Beamforming and Power On/Off Strategy
Wei Dai, Youjian Liu, Vincent K. N. Lau +1
It is well known that Multiple-Input Multiple-Output (MIMO) systems have high spectral efficiency, especially when channel state information at the transmitter (CSIT) is available.…
Performance Analysis of CDMA Signature Optimization with Finite Rate Feedback
Wei Dai, Youjian Liu, Brian Rider
We analyze the performance of CDMA signature optimization with finite rate feedback. For a particular user, the receiver selects a signature vector from a signature codebook to avo…
Quantization Bounds on Grassmann Manifolds and Applications to MIMO Communications
Wei Dai, Youjian Liu, Brian Rider
This paper considers the quantization problem on the Grassmann manifold \mathcal{G}_{n,p}, the set of all p-dimensional planes (through the origin) in the n-dimensional Euclidean s…