in Decentralized Neworks (2009)
Kamyar Moshksar, Alireza Bayesteh, Amir K. Kh, Kamyar Moshksar, Alireza Bayesteh, Amir K. Kh
We consider a wireless communication network with a fixed number of frequency sub-bands to be shared among several transmitter-receiver pairs. In traditional frequency division (FD) systems, the...
Capacity bounds for the Gaussian interference channel,” submitted to (2009)
Abolfazl S. Motahari, Student Member, Amir K. Kh
The capacity region of the two-user Gaussian Interference Channel (IC) is studied. Three classes of channels are considered: weak, one-sided, and mixed Gaussian ICs. For the weak Gaussian IC, a new...
On the Optimal Design of Wireless Relay Networks (2009)
Vahid Pourahmadi, Shervan Fash, Aladdin Saleh, Amir K. Kh
It is known that the achievable data rate per user can be increased when relays are deployed in wireless networks. However, the drawback of this solution is that some of the network resources should...
1 Adaptive Modeling and Long-Range Prediction of Mobile Fading Channels (2009)
Abdorreza Heidari, Student Member, Amir K. Kh, Derek Mcavoy
A key element for many fading-compensation techniques is a (long-range) prediction tool for the fading channel. A linear approach, usually used to model the time evolution of the fading process, does...
Diversity-Fidelity Tradeoff in Transmission of Analog Sources over MIMO Fading Channels (2009)
Mahmoud Taherzadeh, Kamyar Moshksar, Amir K. Kh
Abstract — In this paper, the theoretical limits on the asymptotic performance of joint source-channel coding over MIMO fading channels are investigated. Similar to the concept of...
Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
Abstract—This paper studies the setup of a multiple-relay network in which K half-duplex multiple-antenna relays assist in the transmission between a/several multiple-antenna source(s) and a...
On the Throughput Maximization in Dencentralized Wireless Networks (2009)
Jamshid Abouei, Alireza Bayesteh, Masoud Ebrahimi, Amir K. Kh
A distributed single-hop wireless network with K links is considered, where the links are partitioned into a fixed number (M) of clusters each operating in a subchannel with bandwidth W M. The...
Robust Joint Source-Channel Coding for 1 Delay-Limited Applications (2009)
Mahmoud Taherzadeh, Amir K. Kh
In this paper, we consider the problem of robust joint source-channel coding over an additive white Gaussian noise channel. We propose a new scheme which achieves the optimal slope of the...
Path Diversity over Packet Switched Networks: Performance Analysis and Rate Allocation (2009)
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh, Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
Path diversity works by setting up multiple parallel connections between the end points using the topological path redundancy of the network. In this paper, Forward Error Correction (FEC) is applied...
1 Secure Broadcasting: The Secrecy Rate Region (2009)
Ghadamali Bagherikaram, Abolfazl S. Motahari, Amir K. Kh
In this paper, we consider a scenario where a source node wishes to broadcast two confidential messages for two respective receivers, while a wire-tapper also receives the transmitted signal. This...
Capacity bounds for the Gaussian interference channel,” submitted to (2009)
Abolfazl S. Motahari, Amir K. Kh
Abstract — The capacity region of the two-user Gaussian Interference Channel (IC) is studied. Two classes of channels are considered: weak and mixed Gaussian IC. For the weak Gaussian IC, a new...
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir K. Kh
Abstract — We consider the problem of cooperative communication for a network composed of two half-duplex parallel relays with additive white Gaussian noise. Two protocols, i.e., Simultaneous and...
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh, Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
An erasure channel with a fixed alphabet size q, where q ≫ 1, is studied. It is proved that over any erasure channel (with or without memory), Maximum Distance Separable (MDS) codes achieve the...
Analysis of the Asymptotic Performance of Turbo Codes (2009)
M. Hadi Baligh, Amir K. Kh, I. Bahceci
Battail [1989] shows that an appropriate criterion for the design of long block codes is the closeness of the normalized weight distribution to Gaussian. A subsequent work by Biglieri and Volski...
On diversitymultiplexing tradeoff in multiple-antennas multiple-relay networks (2009)
Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
Abstract—This paper studies the setup of a multiple-relay network in which K half-duplex multiple-antenna relays assist in the transmission between a/several multiple-antenna source(s) and a...
Kamyar Moshksar, Amir K. Kh, Kamyar Moshksar, Amir K. Kh
We consider a wireless communication network with a fixed number of frequency sub-bands to be shared among several transmitter-receiver pairs. In traditional frequency division (FD) systems, the...
Capacity of Block-Memoryless Channels with Causal Channel Side Information 1 (2009)
The capacity of a time-varying block-memoryless channel in which the transmitter and the receiver have access to (possibly different) noisy causal channel side information (CSI) is obtained. It is...
Capacity Bounds for 1 the Gaussian Interference Channel (2009)
Abolfazl S. Motahari, Student Member, Amir K. Kh
The capacity region of the two-user Gaussian Interference Channel (IC) is studied. Three classes of channels are considered: weak, one-sided, and mixed Gaussian IC. For the weak Gaussian IC, a new...
1 Coding over an Erasure Channel with a Large Alphabet Size (2009)
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
Abstract—An erasure channel with a fixed alphabet size q, where q ≫ 1, is studied. It is proved that over any erasure channel (with or without memory), Maximum Distance Separable (MDS) codes...
1 An Efficient Adaptive Distributed Space Time Coding Scheme for Cooperative Relaying (2009)
Jamshid Abouei, Hossein Bagheri, Amir K. Kh
Abstract — A non-regenerative dual-hop wireless system based on a distributed space-time-coding strategy is considered. It is assumed that each relay retransmits an appropriately scaled space-time...
Characterization of SINR Region for Interfering Links with Constrained Power (2009)
Hajar Mahdavi-doost, Masoud Ebrahimi, Amir K. Kh
In this paper, a communication system including n interfering additive white Gaussian noise (AWGN) links is considered. Each transmitter uses a Gaussian codebook and each receiver only decodes the...
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh, Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
An erasure channel with a fixed alphabet size q, where q ≫ 1, is studied. It is proved that over any erasure channel (with or without memory), Maximum Distance Separable (MDS) codes achieve the...
Optimal Coding for the Erasure Channel with 1 Arbitrary Alphabet Size (2009)
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
An erasure channel with an arbitrary alphabet size q is studied. It is proved that over any erasure channel (with or without memory), Maximum Distance Separable (MDS) codes achieve the minimum...
Path Diversity over Packet Switched Networks: Performance Analysis and Rate Allocation (2009)
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
Abstract—Path diversity works by setting up multiple parallel connections between the end points using the topological path redundancy of the network. In this paper, Forward Error Correction (FEC)...
Optimum diversity-multiplexing tradeoff in the multiple relays network (2009)
Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
This paper studies the setup of a multiple-relay network in which K half-duplex multiple-antenna relays assist in the transmission between a/several multiple-antenna transmitter(s) and a...
Secrecy Capacity Region of Gaussian Broadcast Channel (2009)
Ghadamali Bagherikaram, Abolfazl S. Motahari, Amir K. Kh
Abstract—In this paper, we first consider a scenario where a source node wishes to broadcast two confidential messages for two respective receivers, while a wire-taper also receives the transmitted...
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir K. Kh
This study investigates the problem of communication for a network composed of two half-duplex parallel relays with additive white Gaussian noise. Two protocols, i.e., Simultaneous and Successive...
Secure Broadcasting: The Secrecy Rate Region (2009)
Ghadamali Bagherikaram, Abolfazl S. Motahari, Amir K. Kh
Abstract — In this paper, we consider a scenario where a source node wishes to broadcast two confidential messages for two respective receivers, while a wire-tapper also receives the transmitted...
1 in the Low SNR Regime: To Hop or Not to Hop? (2009)
Kamyar Moshksar, Amir K. Kh, Kamyar Moshksar, Amir K. Kh
We consider a wireless communication network with a fixed number u of frequency sub-bands to be shared among N transmitter-receiver pairs. In traditional frequency division (FD) systems, the...
1 the Internet using MDS Codes (2009)
Shervan Fash, Shahab Oveis Gharan, Amir K. Kh, Shervan Fash, Shahab Oveis Gharan, Amir K. Kh
Path diversity works by setting up multiple parallel connections between the end points using the topological path redundancy of the network. In this paper, Forward Error Correction (FEC) is applied...
The Secrecy Capacity Region of the Degraded Vector Gaussian Broadcast Channel (2009)
Ghadamali Bagherikaram, Abolfazl S. Motahari, Amir K. Kh
Abstract—In this paper, we consider a scenario where a source node wishes to broadcast two confidential messages for two respective receivers via a Gaussian MIMO broadcast channel. A wire-tapper...
Multilevel Coding Strategy for Two-Hop Single-User Networks (2009)
Vahid Pourahmadi, Alireza Bayesteh, Amir K. Kh
Abstract—In this paper, a two-hop network in which the information is transmitted from a source via a relay to a destination is considered. It is assumed that both channels are quasi-static fading...
with Causal Channel Side Information (2009)
Hamid Farmanbar, Amir K. Kh, Hamid Farmanbar, Amir K. Kh
The capacity of a time-varying block-memoryless channel in which the transmitter and the receiver have access to (possibly different) noisy causal channel side information (CSI) is obtained. It is...
A New Achievable Rate for the Gaussian Parallel Relay Channel (2009)
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir K. Kh
Schein and Gallager introduced the Gaussian parallel relay channel in 2000. They proposed the Amplify-and-Forward (AF) and the Decode-and-Forward (DF) strategies for this channel. For a long time,...
Seyed Ali Ahmadzadeh, Seyed Abolfazl Motahari, Amir K. Kh, Seyed Ali Ahmadzadeh, Seyed Abolfazl Motahari, Amir K. Kh
In this paper, a single-hop single-relay system with a direct link between the source and the destination is considered when the relay operates in the half-duplex mode. Motivated by the concept of...
On the Delay-Throughput Tradeoff in Distributed Wireless Networks (2009)
Jamshid Abouei, Alireza Bayesteh, Amir K. Kh, Jamshid Abouei, Alireza Bayesteh, Amir K. Kh
The delay-throughput of a single-hop wireless network with n randomly distributed links is analyzed. We consider a general shadow-fading model, described by parameters (α, ̟), where α denotes the...
Simultaneous Relaying versus Successive Relaying (2008)
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir Keyvan Kh, Seyed Saeed, Changiz Rezaei, ...
This study investigates the problem of communication for a network composed of two half-duplex parallel relays with additive white Gaussian noise. Two protocols, i.e., Simultaneous and Successive...
Shahab Oveis Gharan, Alireza Bayesteh, Amir Keyvan Kh, Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
This paper studies the setup of a multiple-relay network in which K half-duplex multiple-antenna relays assist in the transmission between a/several multiple-antenna transmitter(s) and a...
and Amir Keyvan Khandani 2008A New Achievable Rate for the Gaussian Parallel Relay Channel (2008)
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir Keyvan Kh, Seyed Saeed, Changiz Rezaei, ...
Schein and Gallager introduced the Gaussian parallel relay channel in 2000. They proposed the Amplify-and-Forward (AF) and the Decode-and-Forward (DF) strategies for this channel. For a long time,...
Alireza Bayesteh, Kamyar Moshksar, Amir K. Kh, Alireza Bayesteh, Kamyar Moshksar, Amir K. Kh
In this paper, a downlink communication system, in which a Base Station (BS) equipped with M antennas communicates with N (N ≫ 1) single-antenna users, in a Rician fading environment is considered....
Simultaneous Relaying versus Successive Relaying (2008)
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir Keyvan Kh, Seyed Saeed, Changiz Rezaei, ...
This paper deals with the problem of cooperative communication for a network with multiple halfduplex relays. Two half-duplex relaying protocols, i.e. simultaneous and successive relaying protocols,...
and Amir Keyvan Khandani 2008A New Achievable Rate for the Gaussian Parallel Relay Channel (2008)
Seyed Saeed, Changiz Rezaei, Shahab Oveis Gharan, Amir Keyvan Kh, Seyed Saeed, Changiz Rezaei, ...
Schein and Gallager introduced the full-duplex Gaussian parallel relay channel in 2000. They proposed the Amplify-and-Forward (AF) and the Decode-and-Forward (DF) strategies for this channel. For a...
1 On The Capacity Of Time-Varying Channels With Periodic Feedback (2007)
Mehdi Ansari Sadrabadi, Amir K. Kh
The capacity of time-varying channels with periodic feedback at the transmitter is evaluated. It is assumed that the channel state information is perfectly known at the receiver and is fed back to...
Asymptotic analysis of amplify and forward relaying in a parallel MIMO relay network (2007)
Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
Abstract — This paper considers the setup of a parallel MIMO relay network in which K relays, each equipped with N antennas, assist the transmitter and the receiver, each equipped with M antennas,...
The Multiple Relays Network (2007)
Shahab Oveis Gharan, Alireza Bayesteh, Amir Keyvan Kh, Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
The system, as in [1], [2], and [3], consists of K relays assisting the transmitter and the receiver in the half-duplex mode, i.e. in each time, the relays can either transmit or receive. The...
Ali Abedi A, Amir K. Kh, Ani B
www.elsevier.com/locate/jfranklin A new method for performance evaluation of bit decoding algorithms using statistics of the log likelihood ratio $
The Multiple Relays Network (2007)
Shahab Oveis Gharan, Alireza Bayesteh, Amir Keyvan Kh, Shahab Oveis Gharan, Alireza Bayesteh, Amir K. Kh
This paper studies the setup of a multiple relays network in which K half-duplex single-antenna relays assist the single-antenna transmitter(s) and the single-antenna receiver. Each pair of nodes are...
Single-Hop Wireless Networks with Fading Channels (2006)
Masoud Ebrahimi, Amir K. Kh, Masoud Ebrahimi, Amir K. Kh
A network of n communication links operating over a shared wireless channel is considered. Fading is assumed to be the dominant factor affecting the strength of the channels between nodes. The...