In this paper, we study a multiple access channel with feedback, where the forward and feedback channels share the same link in time-duplex manner, and the transmitters do not have a cooperative link (hidden node topology). Thus, in addition to the transmitters, the receiver is also allowed to transmit (with a maximum average power Pf in Gaussian case). The objective is to minimize the fraction...

Channel-state-information (CSI) feedback methods are considered, especially for massive or very large-scale multipleinput multiple-output (MIMO) systems. To extract essential information from the CSI without redundancy that arises from the highly correlated antennas, a receiver transforms (sparsifies) a correlated CSI vector to an uncorrelated sparse CSI vector by using a Karhunen-Loève transfo...

Per-cell codebook-based limited feedback is highly desirable in coordinated multi-point (CoMP) systems owing to flexibility and compatibility. Except for the per-cell codeword indices, each user should feed back other information for the central unit to reconstruct global channel direction information (CDI) and estimate channel quality information (CQI) for downlink transmission. In this paper,...

Given a frequency-selective fading channel, feedback can be used to convey Channel State Information (CSI) and Receiver State Information (RSI) to the transmitter. RSI refers to information about the receiver’s estimate of the message, which can be used to improve reliability, e.g., through retransmissions. This paper studies the trade-off between these two types of feedback under total feedbac...

Secure communication with feedback is studied. An achievability scheme in which the backward channel is used to generate a shared secret key is proposed. The scenario of binary symmetric forward and backward channels is considered, and a combination of the proposed scheme and Maurer’s coding scheme is shown to achieve improved secrecy rates. The scenario of a Gaussian channel with perfect outpu...

Mobile channels suffer from multipath fading and necessitate transmitter adaptation to achieve Shannon capacity. The capacity achieving transmitter adaptation strategy depends on how much channel side information (CSI) is available at the transmitter (CSIT) and the receiver (CSIR). When CSI is perfectly known at both sides, it is shown in [10] that for AWGN channels with flat fading, the optima...

Deep learning (DL), a branch of artificial intelligence (AI) techniques, has shown great promise in various disciplines such as image classification and segmentation, speech recognition, language translation, among others. This remarkable success DL stimulated increasing interest applying this paradigm to wireless channel estimation recent years. Since principles are inductive nature distinct f...

In this paper, we investigate a general class of partial channel state information feedback strategies for communication over flat fading multiple antenna channels with t transmitters and r receivers. Specifically, we consider scenarios where the partial channel state information is sent back from the receiver to the transmitter in the form of n beamformer vectors with corresponding power alloc...

A class of burst noise-erasure channels which incorporate both errors and erasures during transmission is studied. The channel, whose output is explicitly expressed in terms of its input and a stationary ergodic noise-erasure process, is shown to have a so-called “quasi-symmetry” property under certain invertibility conditions. As a result, it is proved that a uniformly distributed input proces...

We consider binary communication over the additive white Gaussian noise channel with no bandwidth constraint on the channel input signals, assuming the availability of a noiseless delayless feedback link. Although the signals at time t can depend on the noise at times 7 < t and are therefore random functions, we require that the signal energy never exceed a fixed level. We show that the optimal...