The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Makoto Taromaru - One of the best experts on this subject based on the ideXlab platform.

  • a protocol of multi phase Cooperative wireless networks for the lowest outage probability
    International Symposium on Communications and Information Technologies, 2007
    Co-Authors: Chen Sun, Jun Cheng, Makoto Taromaru
    Abstract:

    Multi-phase Cooperative Communication in a wireless network is studied in this paper. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions. Each portion is transmitted from a distinct node in a sequential manner to the destination node. Theorem 1 gives the criterion on how to select wireless nodes for achieving the lowest outage probability of information capacity. Theorems 2 and 3 give the closed-form expressions of the for arbitrary signal-to-noise (SNR) situations. In situations, where a large number of nodes satisfy the condition in Theorem 1, a protocol is proposed to select a limited number of nodes to achieve a satisfactory performance. The theoretical results are useful to designing practical Cooperative Communication systems.

  • achieving the lowest outage probability for multi phase Cooperative wireless networks
    Information Theory Workshop, 2007
    Co-Authors: Chen Sun, Jun Cheng, Makoto Taromaru
    Abstract:

    The performance of a multi-phase Cooperative Communication is studied in a wireless network. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions. Each portion is transmitted from a distinct node in a sequential manner to the destination node. First, we give the criterion on how to select wireless nodes for achieving the lowest outage probability of information capacity. Second, the analytical expressions of the optimal frame splitting (FS) ratios are derived for arbitrary signal-to-noise (SNR) situations. This is fulfilled by employing Gaussian approximations of those random MIMO channel capacities. Finally, we examine the optimal FS ratios in high-SNR regime. The theoretical results are useful to designing Cooperative Communication protocols.

Chen Sun - One of the best experts on this subject based on the ideXlab platform.

  • a protocol of multi phase Cooperative wireless networks for the lowest outage probability
    International Symposium on Communications and Information Technologies, 2007
    Co-Authors: Chen Sun, Jun Cheng, Makoto Taromaru
    Abstract:

    Multi-phase Cooperative Communication in a wireless network is studied in this paper. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions. Each portion is transmitted from a distinct node in a sequential manner to the destination node. Theorem 1 gives the criterion on how to select wireless nodes for achieving the lowest outage probability of information capacity. Theorems 2 and 3 give the closed-form expressions of the for arbitrary signal-to-noise (SNR) situations. In situations, where a large number of nodes satisfy the condition in Theorem 1, a protocol is proposed to select a limited number of nodes to achieve a satisfactory performance. The theoretical results are useful to designing practical Cooperative Communication systems.

  • achieving the lowest outage probability for multi phase Cooperative wireless networks
    Information Theory Workshop, 2007
    Co-Authors: Chen Sun, Jun Cheng, Makoto Taromaru
    Abstract:

    The performance of a multi-phase Cooperative Communication is studied in a wireless network. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions. Each portion is transmitted from a distinct node in a sequential manner to the destination node. First, we give the criterion on how to select wireless nodes for achieving the lowest outage probability of information capacity. Second, the analytical expressions of the optimal frame splitting (FS) ratios are derived for arbitrary signal-to-noise (SNR) situations. This is fulfilled by employing Gaussian approximations of those random MIMO channel capacities. Finally, we examine the optimal FS ratios in high-SNR regime. The theoretical results are useful to designing Cooperative Communication protocols.

Aditya K Jagannatham - One of the best experts on this subject based on the ideXlab platform.

  • mimo stbc based multiple relay Cooperative Communication over time selective rayleigh fading links with imperfect channel estimates
    IEEE Transactions on Vehicular Technology, 2017
    Co-Authors: Neeraj Varshney, Aditya K Jagannatham
    Abstract:

    This paper analyzes the effect of time-selective fading arising due to node mobility and imperfect channel estimates on the end-to-end performance of multiple-input multiple-output space-time block coded multiple relay Cooperative Communication systems. Both dual-phase and multi-phase selective decode-and-forward relaying protocols are considered for the end-to-end Communication in a multiple relay Cooperative system, followed by presentation of complete analyses for the same. For each protocol, closed-form expressions are derived for the per-frame average pair-wise error probability and asymptotic error floor over independent and nonidentical time-selective Rayleigh fading links. A framework is also developed for obtaining the optimal source relay power factors for each of the above protocols, which significantly improve the end-to-end reliability of the system for a given power budget. It is shown that both the multirelay systems achieve the full diversity order (DO) when all the nodes are static and perfect channel estimates are available at each receiving node. The DO of the system reduces to that of the direct source–destination link for a scenario when only the relays are mobile. Interestingly, however, in other mobile scenarios, both the systems are limited by an asymptotic error floor with increasing signal to noise ratio. Further, the impact of DO of the source–relay and relay–destination links on the optimal source–relay power allocation is also explicitly demonstrated. Simulation results yield several important insights into the end-to-end error performance for different mobility conditions and also validate the derived analytical results.

  • selective df protocol for mimo stbc based single multiple relay Cooperative Communication end to end performance and optimal power allocation
    IEEE Transactions on Communications, 2015
    Co-Authors: Neeraj Varshney, Amalladinne Vamsi Krishna, Aditya K Jagannatham
    Abstract:

    In this paper, we consider the performance of a selective decode-and-forward (DF) relaying based multiple-input multiple-output (MIMO) space-time block coded (STBC) Cooperative Communication system with single and multiple relays. We begin with a single relay based MIMO STBC system and derive the closed form expression for the end-to-end PEP of coded block detection at the destination node. It is also demonstrated that the MIMO STBC Cooperative Communication system achieves the full diversity order of the system. We also derive the optimal source relay power allocation, which minimizes the end-to-end decoding error of the Cooperative system for a given power budget. Subsequently, for the multiple relay scenario, we consider two different relaying protocols based on two-phase and multi-phase Communication. For each of these multi-relay protocols, we derive the closed form expressions for the end-to-end error rate, diversity order, and optimal power allocation. Simulation results are presented to validate the performance of the proposed single and multiple relay based Cooperative Communication schemes and the derived analytical results. Further, these schemes can also be seen to lead to a performance improvement compared to several other relaying schemes in existing literature.

Jun Cheng - One of the best experts on this subject based on the ideXlab platform.

  • a protocol of multi phase Cooperative wireless networks for the lowest outage probability
    International Symposium on Communications and Information Technologies, 2007
    Co-Authors: Chen Sun, Jun Cheng, Makoto Taromaru
    Abstract:

    Multi-phase Cooperative Communication in a wireless network is studied in this paper. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions. Each portion is transmitted from a distinct node in a sequential manner to the destination node. Theorem 1 gives the criterion on how to select wireless nodes for achieving the lowest outage probability of information capacity. Theorems 2 and 3 give the closed-form expressions of the for arbitrary signal-to-noise (SNR) situations. In situations, where a large number of nodes satisfy the condition in Theorem 1, a protocol is proposed to select a limited number of nodes to achieve a satisfactory performance. The theoretical results are useful to designing practical Cooperative Communication systems.

  • achieving the lowest outage probability for multi phase Cooperative wireless networks
    Information Theory Workshop, 2007
    Co-Authors: Chen Sun, Jun Cheng, Makoto Taromaru
    Abstract:

    The performance of a multi-phase Cooperative Communication is studied in a wireless network. Each node is a mobile module having multiple antennas (MA) or a group of sensors forming a virtual antenna array (VAA). The scenario comprises a number of multiple-input multiple-output (MIMO) channels with mutually independent Rayleigh fading processes. A data frame from a signal source node is split into portions. Each portion is transmitted from a distinct node in a sequential manner to the destination node. First, we give the criterion on how to select wireless nodes for achieving the lowest outage probability of information capacity. Second, the analytical expressions of the optimal frame splitting (FS) ratios are derived for arbitrary signal-to-noise (SNR) situations. This is fulfilled by employing Gaussian approximations of those random MIMO channel capacities. Finally, we examine the optimal FS ratios in high-SNR regime. The theoretical results are useful to designing Cooperative Communication protocols.

Jun Hong Cui - One of the best experts on this subject based on the ideXlab platform.

  • Energy-efficient Cooperative Communication in a clustered wireless sensor network
    IEEE Transactions on Vehicular Technology, 2008
    Co-Authors: Zhong Zhou, Shengli Zhou, Shuguang Cui, Jun Hong Cui
    Abstract:

    In this paper, we consider a clustered wireless sensor network where sensors within each cluster relay data packets to nearby clusters using Cooperative Communications. We propose a Cooperative transmission scheme based on distributed space-time block coding and conduct a systematic analysis on the resulting energy consumption. Compared with existing work, our distinctions are twofold: (1) Only sensors that can correctly decode received packets participate in the Cooperative transmission, where the number of cooperating nodes depends on both channel and noise realizations; and (2) we use packet-error-rate-based analysis rather than symbol-error-rate-based analysis. This is more realistic since error detection is usually done at the packet level via, e.g., cyclic-redundancy-check codes. Based on the analysis, we further minimize the overall energy consumption by power allocation between the intracluster and intercluster transmissions. With numerical methods, we investigate how energy consumption is affected by the transmit power allocation, the total number of sensors in a cluster, the end-to-end packet error rate requirement, and the relative magnitudes between the intracluster and intercluster distances. Comparisons with direct (nonCooperative) transmission schemes demonstrate the significant energy-saving advantage of the proposed Cooperative scheme.

  • Energy-efficient Cooperative Communication based on power control and selective single-relay in wireless sensor networks
    IEEE Transactions on Wireless Communications, 2008
    Co-Authors: Zhong Zhou, Jun Hong Cui, Shengli Zhou, Shuguang Cui
    Abstract:

    Cooperative Communication with single relay selection is a simple but effective Communication scheme for energy-constrained networks. In this paper, we propose a novel, selective single-relay Cooperative scheme, combining selective-relay Cooperative Communication with physical-layer power control. Based on the MAC-layer RTS-CTS signaling, a set of potential relays compute individually the required transmission power to participate in the Cooperative Communication, and compete within a window of fixed length. The "best" relay is selected in a distributed fashion with minimum signaling overhead. We derive power-control solutions corresponding to two policies on relay selection: One is to minimize the energy consumption per data packet, and the other is to maximize the network lifetime. Our numerical and simulation results confirm that the proposed scheme achieves significant energy savings and prolongs the network lifetime considerably.