There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Table Of Integrals Series And Products

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The Theory of Industrial Organization

Probability and Measure

"Written by the pioneers of the concept, this is the first complete guide to the physical and engineering principles of Massive MIMO. Assuming only a basic background in communications and statisti ...

Fundamentals of Massive MIMO

Hardware-efficient low-complexity precoding is very important in the downlink of Massive MIMO systems for mitigating interference and optimizing performance. In this paper, we propose a correlation-driven optimized Taylor expansion (CD-OTE) precoding scheme to simplify linear minimum mean square error (MMSE) precoding. In order to simplify the hardware-expensive matrix inversion involved in the linear MMSE pre-coder, a Taylor expansion with optimized polynomial coefficients and selection of the most relevant correlation coefficients is proposed. We take into consideration the correlation between different users' channels and develop a general design criterion. Both convergence and complexity analyses are carried out. Simulation results show that the proposed CD-OTE precoder is significantly better than previously reported techniques, while requiring a similar cost.

Correlation-driven optimized Taylor expansion precoding for massive MIMO systems with correlated channels

This paper presents an enhanced hybrid asymmetrically clipped optical orthogonal frequency division multiplexing (OFDM) scheme referred to as EHACO-OFDM. The scheme uses asymmetrically clipped optical OFDM (ACO-OFDM) on the odd subcarriers, pulse-amplitude-modulated discrete multitone modulation (PAM-DMT) on the imaginary parts of even subcarriers, and direct-current-biased optical OFDM (DCO-OFDM) on the real parts of even ones. Since the entire available bandwidth is utilized for data modulation, this scheme can achieve higher spectral efficiency than HACO-OFDM and ACO-OFDM. Moreover, as a smaller DC bias is introduced in our scheme, it is more power efficient than asymmetrically clipped DC-biased optical OFDM (ADO-OFDM) and DCO-OFDM. Simulation results show that EHACO-OFDM performs much better than ADO-OFDM and HACO-OFDM at high bit rates.

Novel spectral efficient OFDM for optical wireless communication

This paper considers the problem of transmission scheduling of delay-sensitive data over a point-to-point correlated Rayleigh fading channel with channel estimation errors. According to the imperfect channel state information (CSI) and the buffer state, the transmit power and the modulation and coding scheme (MCS) are determined to jointly maximize the energy efficiency, and minimize transmission delay and overflow probability. To account of the effects of the channel estimation errors, the CSI imperfection is modeled as uncertain sets using the ellipsoidal approximation. Then the joint optimization problem is formulated using the weighted sum method. Using the idea of online learning, two algorithms are proposed to schedule the delay-sensitive data for the situations with and without the uncertainty bound of channel estimation, respectively. The numerical results indicate that the proposed online learning based scheduling algorithms can tackle the imperfect CSI issue and improve the system performance in terms of the energy efficiency, transmission delay and overflow probability. Moreover, the convergence times are very short, which highlights the feasibility of the proposed online learning based scheduling for practical systems.

Online Learning Based Transmission Scheduling over a Fading Channel with Imperfect CSI

The main focus of this paper is to investigate the downlink outage probability of the distributed antenna system (DAS) over shadowed Nakagami-m fading channels. In the analysis, by making use of the moment generating function (MGF), this paper first derives the probability density function (PDF) of the output signal to noise ratio (SNR) after maximal ratio combining (MRC) at the receiver. Further, an approximate analytical expression of outage probability is derived for the downlink of DAS with an antenna selective transmission scheme (ASTS). The numerical results show that the derived analytical expression can evaluate the system performance very accurately.

Downlink outage probability of distributed antenna systems over shadowed Nakagami-m fading channels with antenna selection

This letter proposes a dynamic region based limited feedback scheme for efficient power allocation in orthogonal frequency division multiplexing (OFDM) systems. At the receiver, after obtaining the channel gains of all subcarriers by channel estimation, the maximum and the minimum channel gains can be determined easily. Using the maximum and the minimum channel gains, the proposed scheme divides the range of the channel gains into multiple regions adaptively. Each region is assigned with a unique index. Then each subcarrier will be allocated with the index of the region that its channel gain belongs to. The index information of all subcarriers can be denoted by a code from a predetermined codebook. Along with the maximum and the minimum channel gains, only the codes will be fed back. The feedback information will be used to estimate the channel gains of all subcarriers at the transmitter. The simulation results show that the proposed scheme can improve both the accuracy of feedback channel gain information and the spectral efficiency with less feedback information overhead.

Ming Chen

Papers

Correlation-driven optimized Taylor expansion precoding for massive MIMO systems with correlated channels

Novel spectral efficient OFDM for optical wireless communication

Online Learning Based Transmission Scheduling over a Fading Channel with Imperfect CSI

Downlink outage probability of distributed antenna systems over shadowed Nakagami-m fading channels with antenna selection

A Dynamic Region based Limited Feedback Scheme for Efficient Power Allocation in OFDM Systems