Results 1 - 10 of 388

Causal Theories of Action and Change

by Norman McCain, Hudson Turner - In Proc. AAAI-97 , 1997
"... For many commonsense reasoning tasks associated with action domains, only a relatively simple kind of causal knowledge (previously studied by Geffner and Lin) is required. We define a mathematically simple language for expressing knowledge of this kind and describe a general approach to formalizing ..."
Abstract - Cited by 192 (13 self) - Add to MetaCart
in commonsense reasoning about actions. However, it has not always been clear what this role is, or that it cannot be played by non-causal knowledge as well. In the AI literature, this is evident in the use of state constraints for deriving the indirect effects of actions. Intuitively, a state constraint is a

Cognitive Radio: An Information-Theoretic Perspective

by Aleksandar Jovičić, Pramod Viswanath , 2009
"... We consider a communication scenario in which the primary and the cognitive radios wish to communicate to different receivers, subject to mutual interference. In the model that we use, the cognitive radio has non-causal knowledge of the primary radio’s codeword. We characterize the largest rate at w ..."
Abstract - Cited by 183 (1 self) - Add to MetaCart
We consider a communication scenario in which the primary and the cognitive radios wish to communicate to different receivers, subject to mutual interference. In the model that we use, the cognitive radio has non-causal knowledge of the primary radio’s codeword. We characterize the largest rate

Gaussian state amplification with noisy state observations

by Bernd Bandemer, Chao Tian, Shlomo Shamai (shitz - in Proc. IEEE Int. Symp. on Inform. Theory , 2013
"... Abstract—The problem of simultaneous message transmission and state amplification in a Gaussian channel with additive Gaussian state is studied when the sender has imperfect non-causal knowledge of the state sequence. Inner and outer bounds to the rate–state-distortion region are provided. The codin ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
Abstract—The problem of simultaneous message transmission and state amplification in a Gaussian channel with additive Gaussian state is studied when the sender has imperfect non-causal knowledge of the state sequence. Inner and outer bounds to the rate–state-distortion region are provided

Non-Causal Time-Domain Filters for Single-Channel Noise Reduction

by Jesper Rindom Jensen, Student Member, Jacob Benesty, Mads Græsbøll Christensen, Senior Member, Søren Holdt Jensen, Senior Member
"... Abstract—In many existing time-domain filtering methods for noise reduction in, e.g., speech processing, the filters are causal. Such causal filters can be implemented directly in practice. How-ever, it is possible to improve the performance of such noise reduc-tion filtering methods in terms of bot ..."
Abstract - Cited by 2 (1 self) - Add to MetaCart
of both noise suppression and signal distortion by allowing the filters to be non-causal. Non-causal time-domain filters require knowledge of the future, and are therefore not directly implementable. If the observed signal is processed in blocks, however, the non-causal filters are implementable

Helpers for Cleaning Dirty Papers

by unknown authors
"... We consider communication over an additive white Gaussian noise (AWGN) channel with additive interference. In our setup the sender has no knowledge of the interference. However, there exists a helper that is power constrained and has non-causal knowledge of the interference. The helper and the sende ..."
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We consider communication over an additive white Gaussian noise (AWGN) channel with additive interference. In our setup the sender has no knowledge of the interference. However, there exists a helper that is power constrained and has non-causal knowledge of the interference. The helper

On the Sum-Capacity of the Cognitive Interference Channel with Cognitive-Only Message Sharing

by Diana Maamari, Daniela Tuninetti, Natasha Devroye
"... Abstract—Motivated by the ongoing discussion of spectrum scarcity, this paper considers the K-user cognitive interference channel with K − 1 primary/licensed users and one cogni-tive/secondary user who has non-causal knowledge of the mes-sages of all primary users. This message sharing mechanism is ..."
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Abstract—Motivated by the ongoing discussion of spectrum scarcity, this paper considers the K-user cognitive interference channel with K − 1 primary/licensed users and one cogni-tive/secondary user who has non-causal knowledge of the mes-sages of all primary users. This message sharing mechanism

1The Capacity Region of the Gaussian Cognitive Radio Channels at High SNR

by Stefano Rini, Daniela Tuninetti, Natasha Devroye
"... Abstract—Deterministic channel models have recently proven to be powerful tools for obtaining capacity bounds for Gaussian multiuser networks that are tight in the high SNR regime. In this work we apply this technique to the Gaussian cognitive radio channel: a 2 × 2 interference channel in which one ..."
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one transmitter has non-causal knowledge of the message of the other, whose capacity region in general is still unknown. We approximate the Gaussian cognitive radio channel at high SNR by an underlying linear deterministic channel model for which we determine the exact capacity region, or generalized

On the Achievable Rate Regions for Interference Channels With Degraded Message Sets

by Jinhua Jiang, Yan Xin - IEEE Trans. Inf. Theory , 2008
"... The interference channel with degraded message sets (IC-DMS) refers to a communication model in which two senders attempt to communicate with their respective receivers simultaneously through a common medium, and one of the senders has complete and a priori (non-causal) knowledge about the message b ..."
Abstract - Cited by 37 (4 self) - Add to MetaCart
The interference channel with degraded message sets (IC-DMS) refers to a communication model in which two senders attempt to communicate with their respective receivers simultaneously through a common medium, and one of the senders has complete and a priori (non-causal) knowledge about the message

Norman McCain and Hudson Turner

by Department Of Computer, Norman Mccain, Hudson Turner - In Proc. AAAI-97 , 1997
"... For many commonsense reasoning tasks associated with action domains, only a relatively simple kind of causal knowledge (previously studied by Geffner and Lin) is required. We define a mathematically simple language for expressing knowledge of this kind and describe a general approach to formali ..."
Abstract - Add to MetaCart
in commonsense reasoning about actions. However, it has not always been clear what this role is, or that it cannot be played by non-causal knowledge as well. In the AI literature, this is evident in the use of state constraints for deriving the indirect effects of actions. Intuitively, a state constraint is a

Optimal beamforming in MISO cognitive channels with degraded message sets,” in

by Jing Lv , Ricardo Blasco-Serrano , Eduard A Jorswieck , AND Ragnar Thobaben , Adrian Kliks , Jing Lv , Ricardo Blasco-Serrano , Eduard A Jorswieck , Ragnar Thobaben , Adrian Kliks - Proc. IEEE Wireless Communications and Networking Conference (WCNC), , 2012
"... Abstract-In this paper we consider the coexistence of a singleinput single-output (SISO) primary link with a multiple-input single-output (MISO) secondary user pair that has non-causal knowledge of the primary message. We study an achievable rate region that exploits this knowledge by combining sel ..."
Abstract - Cited by 2 (2 self) - Add to MetaCart
Abstract-In this paper we consider the coexistence of a singleinput single-output (SISO) primary link with a multiple-input single-output (MISO) secondary user pair that has non-causal knowledge of the primary message. We study an achievable rate region that exploits this knowledge by combining
Results 1 - 10 of 388