Information Theory and Reliable Communication
Information Theory and Reliable Communication
Convex Optimization
The noncoherent rician fading Channel-part I: structure of the capacity-achieving input
IEEE Transactions on Wireless Communications
Noncoherent Rician fading Channel-part II: spectral efficiency in the low-power regime
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
Capacity of a mobile multiple-antenna communication link in Rayleigh flat fading
IEEE Transactions on Information Theory
Capacity and mutual information of wideband multipath fading channels
IEEE Transactions on Information Theory
Systematic design of unitary space-time constellations
IEEE Transactions on Information Theory
The capacity of discrete-time memoryless Rayleigh-fading channels
IEEE Transactions on Information Theory
Cutoff rate and signal design for the quasi-static Rayleigh-fading space-time channel
IEEE Transactions on Information Theory
Multiple-antenna signal constellations for fading channels
IEEE Transactions on Information Theory
Broad-band fading channels: signal burstiness and capacity
IEEE Transactions on Information Theory
Capacity and reliability function for small peak signal constraints
IEEE Transactions on Information Theory
Bandwidth scaling for fading multipath channels
IEEE Transactions on Information Theory
Spectral efficiency in the wideband regime
IEEE Transactions on Information Theory
On design criteria and construction of noncoherent space-time constellations
IEEE Transactions on Information Theory
Second-order asymptotics of mutual information
IEEE Transactions on Information Theory
Analysis of multiple-antenna wireless links at low SNR
IEEE Transactions on Information Theory
Characterization and computation of optimal distributions for channel coding
IEEE Transactions on Information Theory
Capacity Per Unit Energy of Fading Channels With a Peak Constraint
IEEE Transactions on Information Theory
Channel Coherence in the Low-SNR Regime
IEEE Transactions on Information Theory
Constellation Design for the Noncoherent MIMO Rayleigh-Fading Channel at General SNR
IEEE Transactions on Information Theory
MIMO Channels in the Low-SNR Regime: Communication Rate, Error Exponent, and Signal Peakiness
IEEE Transactions on Information Theory
On Noncoherent MIMO Channels in the Wideband Regime: Capacity and Reliability
IEEE Transactions on Information Theory
Low-SNR capacity of noncoherent fading channels
IEEE Transactions on Information Theory
Why does the Kronecker model result in misleading capacity estimates?
IEEE Transactions on Information Theory
Superiority of superposition multiaccess with single-user decoding over TDMA in the low SNR regime
IEEE Transactions on Information Theory
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Reliable communication over the discrete-input/continuous-output noncoherent multiple-input multiple-output (MIMO) Rayleigh block-fading channel is considered when the signal-to-noise ratio (SNR) per degree of freedom is low. Two key problems are posed and solved to obtain the optimum discrete input. In both problems, the average and peak power per space-time slot of the input constellation are constrained. In the first one, the peak power to average power ratio (PPAPR) of the input constellation is held fixed, while in the second problem, the peak power is fixed independently of the average power. In the first PPAPR-constrained problem, the mutual information, which grows as O(SNR2), is maximized up to second order in SNR. In the second peak-constrained problem, where the mutual information behaves as O(SNR), the structure of constellations that are optimal up to first order, or equivalently, that minimize energy per bit, are explicitly characterized. Furthermore, among constellations that are first-order optimal, those that maximize the mutual information up to second order, or equivalently, the wideband slope, are characterized. In both PPAPR-constrained and peak-constrained problems, the optimal constellations are obtained in closed form as solutions to nonconvex optimizations, and interestingly, they are found to be identical. Due to its special structure, the common solution is referred to as space-time orthogonal rank one modulation, or STORM. In both problems, it is seen that STORM provides a sharp characterization of the behavior of noncoherent MIMO capacity.