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205 results on '"Milstein, L. B."'

4. Improved Linear Parallel Interference Cancellers

Author

Srikanth, T., Vardhan, K. Vishnu, Chockalingam, A., and Milstein, L. B.

Subjects
Computer Science - Information Theory, Computer Science - Symbolic Computation, Computer Science - Sound, Computer Science - Software Engineering
Abstract

In this paper, taking the view that a linear parallel interference canceller (LPIC) can be seen as a linear matrix filter, we propose new linear matrix filters that can result in improved bit error performance compared to other LPICs in the literature. The motivation for the proposed filters arises from the possibility of avoiding the generation of certain interference and noise terms in a given stage that would have been present in a conventional LPIC (CLPIC). In the proposed filters, we achieve such avoidance of the generation of interference and noise terms in a given stage by simply making the diagonal elements of a certain matrix in that stage equal to zero. Hence, the proposed filters do not require additional complexity compared to the CLPIC, and they can allow achieving a certain error performance using fewer LPIC stages. We also extend the proposed matrix filter solutions to a multicarrier DS-CDMA system, where we consider two types of receivers. In one receiver (referred to as Type-I receiver), LPIC is performed on each subcarrier first, followed by multicarrier combining (MCC). In the other receiver (called Type-II receiver), MCC is performed first, followed by LPIC. We show that in both Type-I and Type-II receivers, the proposed matrix filters outperform other matrix filters. Also, Type-II receiver performs better than Type-I receiver because of enhanced accuracy of the interference estimates achieved due to frequency diversity offered by MCC., Comment: Accepted in IEEE Trans. on Wireless Communications

Published
2007

32. Error-resilient video communications over CDMA networks with a bandwidth constraint

Author

Shen, Yushi, Dr., Cosman, P C, Prof., and Milstein, L B, Prof.

Subjects
bandwidth allocation, channel estimation, code-division multiple-access (CDMA), joint source-channel coding, mode switching, multiuser system, video communications, wireless Internet
Abstract

We present an adaptive video transmission scheme for use in a code-division multiple-access network, which incorporates efficient bandwidth allocation among source coding, channel coding, and spreading under a fixed total bandwidth constraint. We derive the statistics of the received signal, as well as a theoretical bound on the packet drop rate at the receiver. Based on these results, a bandwidth allocation algorithm is proposed at the packet level, which incorporates the effects of both the changing channel conditions and the dynamics of the source content. Detailed simulations are done to evaluate the performance of the system, and the sensitivity of the system to estimation error is presented.

Published
2006

36. Video coding with fixed-length packetization for a tandem channel

Author

Shen, Yushi, Dr., Cosman, P C, Prof., and Milstein, L B, Prof.

Subjects
mode switching, packet-switched networks, tandem channel, video compression, wireless internet
Abstract

A robust scheme is presented for the efficient transmission of packet video over a tandem wireless Internet channel. This channel is assumed to have bit errors (due to noise and fading on the wireless portion of the channel) and packet erasures (due to congestion on the wired portion). First, we propose an algorithm to optimally switch between intracoding and intercoding for a video coder that operates on a packet-switched network with fixed-length packets. Different re-synchronization schemes are considered and compared. This optimal mode selection algorithm is integrated with an efficient channel encoder, a cyclic redundancy check outer coder concatenated with an inner rate-compatible punctured convolutional coder. The system performance is both analyzed and simulated. Last, the framework is extended to operate on a time-varying wireless Internet channel with feedback information from the receiver. Both instantaneous feedback and delayed feedback are evaluated, and an improved method of refined distortion estimation for encoding is presented and simulated for the case of delayed feedback.

Published
2006

48. Error-resilient video communications over CDMA networks with a bandwidth constraint

Author

Shen, Yushi Dr., Cosman, P C Prof., and Milstein, L B Prof.

Subjects
bandwidth allocation, wireless Internet, mode switching, channel estimation, multiuser system, joint source-channel coding, video communications, code-division multiple-access (CDMA)
Abstract

We present an adaptive video transmission scheme for use in a code-division multiple-access network, which incorporates efficient bandwidth allocation among source coding, channel coding, and spreading under a fixed total bandwidth constraint. We derive the statistics of the received signal, as well as a theoretical bound on the packet drop rate at the receiver. Based on these results, a bandwidth allocation algorithm is proposed at the packet level, which incorporates the effects of both the changing channel conditions and the dynamics of the source content. Detailed simulations are done to evaluate the performance of the system, and the sensitivity of the system to estimation error is presented.

Published
2006

49. Video coding with fixed-length packetization for a tandem channel

Author

Shen, Yushi Dr., Cosman, P C Prof., and Milstein, L B Prof.

Subjects
mode switching, Computer Science::Networking and Internet Architecture, tandem channel, Data_CODINGANDINFORMATIONTHEORY, packet-switched networks, video compression, wireless internet, Computer Science::Information Theory
Abstract

A robust scheme is presented for the efficient transmission of packet video over a tandem wireless Internet channel. This channel is assumed to have bit errors (due to noise and fading on the wireless portion of the channel) and packet erasures (due to congestion on the wired portion). First, we propose an algorithm to optimally switch between intracoding and intercoding for a video coder that operates on a packet-switched network with fixed-length packets. Different re-synchronization schemes are considered and compared. This optimal mode selection algorithm is integrated with an efficient channel encoder, a cyclic redundancy check outer coder concatenated with an inner rate-compatible punctured convolutional coder. The system performance is both analyzed and simulated. Last, the framework is extended to operate on a time-varying wireless Internet channel with feedback information from the receiver. Both instantaneous feedback and delayed feedback are evaluated, and an improved method of refined distortion estimation for encoding is presented and simulated for the case of delayed feedback.

Published
2006

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