Handbook of Mathematical Functions, With Formulas, Graphs, and Mathematical Tables,
Handbook of Mathematical Functions, With Formulas, Graphs, and Mathematical Tables,
Approaching the MIMO capacity with a low-rate feedback channel in V-BLAST
EURASIP Journal on Applied Signal Processing
LTE, The UMTS Long Term Evolution: From Theory to Practice
LTE, The UMTS Long Term Evolution: From Theory to Practice
Transmit diversity vs. spatial multiplexing in modern MIMO systems
IEEE Transactions on Wireless Communications
Capacity-approaching rate function for layered multiantenna architectures
IEEE Transactions on Wireless Communications
On the use of rate and power adaptation in V-BLAST systems for data protocol performance improvement
IEEE Transactions on Wireless Communications
Capacity-achieving input covariance for single-user multi-antenna channels
IEEE Transactions on Wireless Communications
On the capacity of doubly correlated MIMO channels
IEEE Transactions on Wireless Communications
The impact of frequency-flat fading on the spectral efficiency of CDMA
IEEE Transactions on Information Theory
Spectral efficiency in the wideband regime
IEEE Transactions on Information Theory
On the capacity of spatially correlated MIMO Rayleigh-fading channels
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Capacity of MIMO systems with semicorrelated flat fading
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Impact of antenna correlation on the capacity of multiantenna channels
IEEE Transactions on Information Theory
High-SNR power offset in multiantenna communication
IEEE Transactions on Information Theory
IEEE Journal on Selected Areas in Communications
Analysis and performance of some basic space-time architectures
IEEE Journal on Selected Areas in Communications
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In a MIMO layered architecture, several codewords are transmitted from a multiplicity of antennas. Although the spectral efficiency is maximized if the rates of these codewords are separately controlled, the feedback rate within the link adaptation loop is reduced if they are constrained to be identical. This poses a direct tradeoff between performance and feedback overhead. This paper provides analytical expressions that quantify the difference in spectral efficiency between both approaches for arbitrary numbers of antennas. Specifically, the characterization takes place in the realm of the low- and highpower regimes via expansions that are shown to have a wide range of validity. In addition, the possibility of adjusting the transmit power of each codeword individually is considered as an alternative to the separate control of their rates. Power allocation, however, turns out to be inferior to rate control within the context of this problem.