Multiple-input multiple-output (MIMO) wireless systems employ spatial multiplexing to increase spectral efficiency or transmit diversity (space-time coding) techniques to improve link reliability. The performance of these signaling techniques is highly dependent on channel characteristics which in turn depend on antenna height and spacing and richness of scattering. The use of dual-polarized an...

Consider M − HChoose P − T communications: T users or less, out of M potential users, are chosen at random to simultaneously transmit binary data over a common channel. A method for constructing codes that achieve error-free M − HChoose P − T communication over the noiseless Adder Channel (AC), at a nominal rate of 1/ T bits per channel symbol per active user, is described and an efficient deco...

Federated Learning (FL) refers to distributed protocols that avoid direct raw data exchange among the participating devices while training for a common learning task. This way, FL can potentially reduce information on local sets is leaked via communications. In order provide formal privacy guarantees, however, it generally necessary put in place additional masking mechanisms. When implemented w...

In this paper we consider the achievable rate region of the Gaussian Multiple Access Channel (MAC) when suboptimal transmission schemes are employed. Focusing on the two-user MAC and assuming uncoded Pulse Amplitude Modulation (PAM), we derive a rate region that is a pentagon, and propose a strategy with which it can be achieved. We also compare the region with outer bounds and with orthogonal ...

This paper proposes a practical coding scheme for the Slepian-Wolf problem of separate encoding of correlated sources. Finite-state machine (FSM) encoders, concatenated in parallel, are used at the transmit side and an iterative turbo decoder is applied at the receiver. Simulation results of system performance are presented for binary sources with different amounts of correlation. Obtained resu...

Douglas-Rachford (DR) algorithm is analyzed for Fourier phase retrieval with a single random phase mask. Local, geometric convergence to a unique fixed point is proved with numerical demonstration of global convergence. Since a single oversampled coded diffraction pattern is not enough to guarantee uniqueness of fixed point, the extra information and data needed takes either of the following tw...

In this work, we consider maximum likelihood (ML) sequence detection in MIMO linear channels corrupted by additive white Gaussian noise. While sphere decoding (SpD) algorithms have been developed to reduce the average complexity of ML detection, the average complexity of classical SpD can itself be impractical in low-SNR settings or when the channel is ill-conditioned. In response, sequential d...

This paper proposes a scheme of combining low-density parity check (LDPC) code with unitary space time modulation (USTM) for noncoherent multiple-input-multiple-output (MIMO) transmitter and receiver over Rayleigh block fading and additive white Gaussian noise (AWGN) channel. The main aim is to design the low complexity coded noncoherent MIMO receiver which is completely dependent on the struct...

In this paper, we present a novel iterative (turbo) receiver with tunable complexity for reliable detection of (uncoded) payload data transmitted over long intersymbol interference (ISI) channels affected by crosstalk, as those typically encountered in emerging HDSL2 services standardized by ANSI T1.418 recommendation. The proposed receiver combines in an original way “minimum mean square error...