Multimode antenna selection for spatial multiplexing systems with linear receivers
IEEE Transactions on Signal Processing - Part II
Zero-forcing methods for downlink spatial multiplexing in multiuser MIMO channels
IEEE Transactions on Signal Processing
Transceiver optimization for multiuser MIMO systems
IEEE Transactions on Signal Processing
A transmit preprocessing technique for multiuser MIMO systems using a decomposition approach
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Generalized multiuser orthogonal space-division multiplexing
IEEE Transactions on Wireless Communications
Quantifying the power loss when transmit beamforming relies on finite-rate feedback
IEEE Transactions on Wireless Communications
On the encoding rate and discrete modulation adaptation design for MIMO links
IEEE Transactions on Wireless Communications
Adaptive Modulation Based on Finite-Rate Feedback in Broadcast Channels
IEEE Transactions on Wireless Communications - Part 2
Probability of error in MMSE multiuser detection
IEEE Transactions on Information Theory
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
On the achievable throughput of a multiantenna Gaussian broadcast channel
IEEE Transactions on Information Theory
On the capacity of MIMO broadcast channels with partial side information
IEEE Transactions on Information Theory
MIMO Broadcast Channels With Finite-Rate Feedback
IEEE Transactions on Information Theory
Hard Fairness Versus Proportional Fairness in Wireless Communications: The Single-Cell Case
IEEE Transactions on Information Theory
MIMO Broadcast Scheduling with Limited Feedback
IEEE Journal on Selected Areas in Communications
Multi-Antenna Downlink Channels with Limited Feedback and User Selection
IEEE Journal on Selected Areas in Communications
How many users should be turned on in a multi-antenna broadcast channel?
IEEE Journal on Selected Areas in Communications
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This paper addresses a per user unitary precoding and rate control (PU2RC) system with adaptive multi-level quadrature amplitude modulation (QAM) modulation, where both the PU2RC operation and adaptive modulation are based on finite rate feedback. The system supports two transmission modes (single user transmit beamforming and multiuser transmission with orthogonal beamforming), and switches between the two modes to maximize the average throughput. We first study single user transmit beamforming, and derive closed-form expressions for the average throughput and bit-error rate (BER) with outdated channel information. Then, multiuser transmission with orthogonal beamforming is investigated. We analyze the throughput and BER performance without feedback delay in the normal signal noise ratio (SNR) regime, and the performance with feedback delay in the interference-limited regime. Simulation results demonstrate the effect of time delay, and the preferred regions of the single user transmission mode and multiuser transmission mode.