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In this paper, we propose a hybrid cooperative beamforming and jamming scheme to enhance the physical-layer security in the two-way relay network with an eavesdropper and a primary receiver. Cooperative beamforming and jamming are designed to maximize the secrecy rate with a total transmit power constraint of the relays and interference power constraint at the primary receiver. The beamformer weights...
When a cognitive radio network shares the spectrum with a primary network, the harmful interference to the primary users is one of the most important concerns. In this paper, we propose a new cognitive scheme which has two cognitive sub-networks sharing the same relay station, considering the interference to the primary user. We study the Weighted Rate Balance problem with the constraint of the transmit...
In cognitive vehicular networks, cooperation transmission has many advantages to access licensed spectrum under interference constraints, by exploring space diversity of vehicles. And in the urban city, there are many candidate vehicles can be a cooperation relay especially when traffic congestion. Recently many papers concern about cognitive multi-hop network, but most of them only analyzed the performance...
This paper studies the cognitive one-way relay network which is composed of a pair of primary transmitter and receiver. A two-step one-way amplify-and-forward (AF) relaying scheme is used by the primary network who utilizes the cognitive radio (CR) terminals as its relay nodes. Simultaneously, the cognitive information is transmitted by multiple CR terminals to the CR base station. In the first phase...
As one of the most popular anonymous communication systems, Tor has become a research hotspot in this area. Recently, Tor nodes from Tor families (referred to as family nodes) have played an increasingly important role and caused significant influence on the Tor network. However, existing research about Tor mostly focuses on the entire Tor network without much consideration about the difference between...
In this paper we investigate the cooperative beamforming in cognitive radio network (CRN) composed of a primary network (PN) and a secondary network (SN). In the SN, the transmitter has to communicate with the receiver with the help of the hybrid relays which use cooperative beamforming to retransmit data. The relays will select amplify-and-forward (AF) or decode-and-forward (DF) according to the...
We investigate a decode and forward (DF) scheme of Asymmetric modulation suited for two-way relay (TWR) with network coding. The considering network coding consists of two time-slots: two users transmit wireless signal to the relay in time-slot 1, and the processed signal is broadcasted in time-slot 2 by the relay. With the received asymmetric modulated signals by relay in time-slot 1, the judging,...
The complex pairing access of multiple users based on network coding is discussed in this paper. In the system, through Network Coding and registration matrices, the same spreading code is allocated to each pair of users. New decision regions are considered. Then we proposed new interference reducing approach for the scenario, comfortable for relay and mobile station. Simulation results demonstrate...
We investigate a decode and forward (DF) scheme of Asymmetric modulation suited for two-way relay (TWR) with network coding. The considering network coding consists of two time-slots: two users transmit wireless signal to the relay in time-slot 1, and the processed signal is broadcasted in time-slot 2 by the relay. With the received asymmetric modulated signals by relay in time-slot 1, the judging,...
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