In this paper, the general wiretap channel with channel state information (CSI) at the transmitter and noiseless feedback is investigated, where the feedback is from the legitimate receiver to the transmitter, and the CSI is available at the transmitter in a causal or noncausal manner. The capacity-equivocation regions are determined for this model in both causal and noncausal cases, and the re...

A coding scheme is proposed for the memoryless Gaussian broadcast channel with correlated noises and feedback. For all noise correlations other than ±1, the gap between the sumrate the scheme achieves and the full-cooperation bound vanishes as the signal-to-noise ratio tends to infinity. When the correlation coefficient is −1, the gains afforded by feedback are unbounded and the prelog is doubl...

Method of Parallel Joint Channel Coding and Cryptography has been analyzed and simulated in this paper. The method is an extension of Soft Input Decryption with feedback, which is used for improvement of channel decoding of secured messages. Parallel Joint Channel Coding and Cryptography results in improved coding gain of channel decoding, which achieves more than 2 dB. Such results are an impl...

Method of Parallel Joint Channel Coding and Cryptography has been analyzed and simulated in this paper. The method is an extension of Soft Input Decryption with feedback, which is used for improvement of channel decoding of secured messages. Parallel Joint Channel Coding and Cryptography results in improved coding gain of channel decoding, which achieves more than 2 dB. Such results are an impl...

This paper utilizes and extends the existing control-information theoretic interdisciplinary framework for analyzing multi-user systems with feedback. The results derived in this paper using this framework are: Generalization of the capacity region of the multiple-access channel (MAC) with feedback with two users to multiple (greater than two) users; and, sum-rate duality between the MAC and br...

Most practical systems employ a feedback channel to convey the channel state information to the transmitter. In this work, we address the problem of designing feedback, with constraints on the feedback rate, for a multiple transmit antenna system employing transmit beamforming with a single receiver antenna. The important contribution of this work is a design criterion for construction of a fin...

We consider a multi-input multi-output (MIMO) multiple access channel (MAC) where the receiver has the perfect channel state information (CSI), while the transmitters have partial CSI, which is in the form of either the covariance matrix of the channel or the mean matrix of the channel. We show that the transmit directions of each user are the eigenvectors of the channel covariance and mean fee...

Abstract Orthogonal frequency division multiplexing (OFDM) has been attracting much attention for very high-speed data transmission over a frequency-selective fading channel. To improve the performance in a fading channel, some form of antenna diversity technique is necessary. Recently, Alamouti’s space-time coded transmit diversity (STTD) has been gaining a lot of attention for downlink (base-...

Channel knowledge at the transmitter can greatly improve the error probability of multi-input multi-output wireless communication system. Though receivers can obtain accurate channel estimates through training with pilot signals, transmitters can have only limited amount of the channel knowledge due to the limited rate of the feedback channel. One simple solution is the receiver quantizes the c...

This paper presents linear and nonlinear precoding design for error-rate improvement in orthogonal space–time block-coded (OSTBC) multiple-input–multiple-output (MIMO) orthogonal frequency-division-multiplexed (OFDM) downlink, where both the conditional mean of the channel gain matrix and the channel gain covariance matrix may be available at the transmitter. The conditional means of the channe...