The problem considered in this paper is whether the capacity of a discrete time Gaussian channel is increased by feedback or not. It is well known that the capacity of a white Gaussian channel under the average power constraint is not changed by feedback. In the previous paper [7] we gave some sufficient conditions under which the capacity of a non-white Gaussian channel is increased by feedbac...

Title of Dissertation: PROGRESSIVE SOURCE-CHANNEL CODING FOR MULTIMEDIA TRANSMISSION OVER NOISY AND LOSSY CHANNELS WITH AND WITHOUT FEEDBACK Vinay Chande, Doctor of Philosophy, 2004 Dissertation directed by: Professor Nariman Farvardin Department of Electrical and Computer Engineering Rate-scalable or layered lossy source-coding is useful for progressive transmission of multimedia sources, wher...

For information transmission, a binary symmetric channel is used. There is also another noisy binary symmetric channel (feedback channel), and the transmitter observes (without delay) all outputs of the forward channel via the feedback channel. Transmission of nonexponentially many messages is considered (i.e., the transmission rate is zero). The achievable decoding error exponent for this comb...

This paper presents the method of measuring the feedback channel, which is developed between the transmit and receive antennas of a wireless repeater by receiving the transmit singal from its tranmit antenna at the receive antenna of the identical repeater, and experiment results otained by anlyzing the measurements. This experiment uses 2GHz W-CDMA signal and is carried out near a highway. The...

Although it is well known that feedback does not increase capacity of an additive white Gaussian channel, Yanagi gave the necessary and sufficient condition under which the capacity Cn,FB(P ) of discrete time non-white Gaussian channel is increased by feedback. In this paper we show that the capacity Cn,FB(P ) of the Gaussian channel with feedback is a concave function of P , and give two type ...

Wyner-Ziv (WZ) video coding – a particular case of distributed video coding (DVC) – is a new video coding paradigm based on two major Information Theory results: the Slepian-Wolf and Wyner-Ziv theorems. Recently, practical WZ video coding solutions were proposed with promising results. Many of the solutions available in the literature make use of a feedback channel (FC) to perform rate control ...

Secure and reliable transmission over communication channels is first characterized by Wyner’s wiretap channel (WTC) model. In recent years, the WTC with noiseless feedback (WTC-NF) attracts a lot attention, and it has been shown that the legal receiver’s feedback enlarges the secrecy capacity of the WTC. Even so, the current feedback strategy for the WTC mainly focuses on generating key used f...

Channel state feedback plays an important role to the improvement of link performance in current wireless communication systems, and even more in the next generation. The feedback information, however, consumes the uplink bandwidth and thus generates overhead. In this paper, we investigate the impact of channel state feedback and propose an improved scheme to reduce the overhead in practical co...

Multiple antenna transmission and reception have been shown to significantly increase the achievable data rates of wireless systems. However, most of the existing analysis assumes perfect or no channel information at the receiver and transmitter. The performance gap between these extreme channel assumptions is large and most practical systems lie in between. Therefore, it is important to analyz...