The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper addresses wireless relay networks consisting of a one-source-one-destination pair and N noncooperative relays. An objective of this paper is to analytically derive a closed form of an optimal relay amplifying vector (or matrix) for an amplify-and-forward (AF) wireless relay network under channel uncertainty (CU), jamming, and transmission power constraints at the relays, using the minimum...
This paper considers a downlink relay network where source communicates with the receivers through relays under frequency-selective fading channels. A spreading sequence design scheme, which is subjected to maximizing the signal-to-interference- plus-noise ratio (SINR) is proposed. It is shown through simulations that a better bit error rate (BER) can be achieved using this proposed scheme. The sensitivity...
This paper proposes a cooperative wireless relay network consisting of a one-source-one-destination node pair and N relay nodes in three wireless communication environments, i.e., jamming, node geometry, and channel uncertainty. The main objective of this paper is to analytically derive the optimal cooperative amplify-and-forward (AF) wireless relay matrix under three conditions with the relay power...
A noncooperative amplify-and-forward (AF) wireless relay network consisting of a one-source-one-destination pair and N relays is investigated. The objective of this paper is to analytically derive the explicit optimal noncooperative relay amplifying matrices (or vector) under both jamming and no-jamming environments, with the relay power constraint based on the minimum mean square error (MMSE) criterion...
Communication between mobile relays has recently gained much attention. In this paper, a novel optimal diagonal relay amplifying matrix based on the minimum mean square error (MMSE) criterion is proposed for mobile nodes. It is also designed for noncooperative distributed wireless mobile nodes under both no-jamming and jamming environments. An amplify and forward (AF) strategy is considered. The system...
This paper studies a noncooperative distributed wireless relay system under jamming and no jamming influence. The system under investigation employs amplify-and-forward (AF) tactic at relays, where N-relays forward their received signals from one-source to M-destination nodes. The new proposed optimal amplifying relay diagonal matrices, designed for single-input-multiple-output (SIMO) system, utilizes...
This paper studied a new approach designed for a distributed wireless network under three adverse communication environment, such as, broadband noise jamming (BNJ), node geometry, and channel uncertainty. It is designed for a cooperative network consisting of one-source, one-destination and N-relay nodes that implement amplify-and-forward (AF) strategy. Deriving optimal relay amplifying matrix is...
This paper introduces a cooperative distributed wireless relay network under a jamming environment at three different locations. An amplify-and-forward (AF) multiple-input single-output (MISO) system is considered with N-relay nodes. For full relay cooperation, all relay nodes in wireless relay networks exchange their received signals from source nodes with no errors. An optimal non-diagonal amplifying...
This paper presents a noncooperative distributed amplify-and-forward (AF) single-input multiple-output (SIMO) wireless relay networks under two adverse wireless communication environments: (1) node geometry and a jamming environment, and (2) channel uncertainty and a jamming environment. All relay nodes in wireless relay networks cannot exchange their received signals from source nodes for relay noncooperation...
This paper presents node geometry and broadband jamming in noncooperative wireless relay networks under the received power constraint. Diagonal relay amplifying matrices based on minimum mean square error (MMSE) criteria corresponding to node geometry and broadband jamming in wireless networks under the received power constraint are derived. All relay nodes are assumed not to communicate with their...
In practice, in any wireless network where 1-source, N-relays and M-destinations exist, each relay node will most likely have different separations with the source and any destination. Therefore, relay node geometry effect in a single-input multiple-output (SIMO) system was studied in this paper. The main contribution of this paper is the derivation of an optimal diagonal amplifying relay matrix under...
The main contribution of this paper is the derivation of an optimal diagonal amplifying relay matrix. This matrix is for a non cooperative distributed wireless relay network in a jamming environment. Minimum mean square error (MMSE) criterion was used in this study. Jamming location was also studied in this paper. Results show that diversity of a system can be degraded or even get lost depending on...
This paper presents a non cooperative distributed minimum mean square error (MMSE) relay scheme. It is designed for wireless relay networks based on an amplify and forward (AF) strategy for one-source, one-destination pair and N relay nodes. Both broadband noise jamming and channel uncertainty were studied in a wireless relay network under received power constraint. The main contribution of this paper...
The main contribution of this paper is the derivation of optimum relay amplifying matrices for noncooperative distributed wireless amplifying-and-forward relay networks. Channels connecting any two nodes are under fading, and either partial-band noise jamming or non-symmetrical node geometry. The minimum mean squared error criterion is used for the optimality. With the derived optimum relay amplifying...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.