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A robust data-aided (DA) signal-to-noise ratio (SNR) estimation algorithm in the time domain is proposed in this paper, aiming at the volatile Doppler shift and carrier wave phase offset under dynamical scenarios for M-ary phase shift keying (MPSK) over the flat-fading complex channel. The proposed algorithm exploits data aided, delay conjugate multiplies the received signal, converts Doppler shift...
The physical layer security technology is an effective way to reduce information leakage in a wireless communication system. In this paper, we study the physical-layer security of one-way wiretap channel which contains a source-destination pair, an eavesdropper and multiple cooperating relay nodes. What's more, in this channel, there exists direct link between the source and the destination (eavesdropper)...
This paper proposes an optimal non-cooperative power allocation game scheme for multi-user multiple-input multiple-output (MU-MIMO) with signal to leakage and noise ratio (SLNR) precoding. The proposed game scheme sets the value of per user SLNR and allocated power as reference for punishment price. Considering the effect of channel correlation and channel estimation error, an alternative robust power...
In the traditional cross-layer redundancy optimization allocation, the system can't fully adapt the time-varying channel, so an H-ARQ transmission mechanism based on rate less code is proposed in this paper. The source uses LT-code as error-erasure code to encode the original packets in the packet-level, every bit of one coded packets is encoded by using LT-code as error-correction code in physical...
A new adaptive demodulation(ADM) scheme based on rate less code and Maximum a Posteriori Probability compute the log-likelihood ratio(LLR) of each bit in the modulated symbol, if the LLR of this bit is larger than the pre-set threshold, demodulate this bit, else delete it. Because the channel state information(CSI) is known by the receiver, this scheme select the bit to demodulate based on the CSI,...
The degree distribution of Fountain Codes has a very important influence on Fountain Codes decoding process. So optimizing the Fountain Codes degree distribution is very significant. In this paper, we present a new way to design the degree distribution with the idea of combining several different degree distributions and integrating them to one degree distribution, namely combined degree distribution...
Energy detection is popularly used in the detection of idle spectrum because of its simple implement and low complexity. But, the detection performance can be observably affected due to noise uncertainty. Papers have proposed some solutions to resist the effects of noise uncertainty. However, most of these papers are assumed that the noise uncertainty interval is known to the detector, designing algorithms...
Energy-Efficience has attracted significant research attention in recent years. Partial spectrum sensing algorithm with decision result prediction (DRP) and decision result modification (DRM) technique ssuccessfully conserves computation energy. Firstly, this paper proposed an new DRP based on the MAJ(Majority) rule instead of AND rule. The simulation results highlights the improvement in energy-efficience...
In this paper, we research a (1×1, 1/2)3 symmetric wireless interference network with a relay, and analyze the necessity of using relay in interference alignment for SISO wireless system. Comprehensively considering the biggest chord distance of all the users, we propose an optimization distributed interference alignment algorithm. Based on the optimization algorithm and adding relay, we can realize...
Relay transmission technology is the key technology for communication in the decentralized wireless network. In multi-hop relay transmissions, employing digital fountain code can greatly reduce the transmission of feedback information, improve the transmission efficiency of the network, and decrease the transmission time. In this paper, a relay pairs transmission scheme based on fountain code transmission...
Recently, heterogeneous networks (HetNets) have drawn significant attention from academia and industry as an efficient way to improve the capacity and coverage of cellular systems. In addition to unicast communication, many important applications in HetNets, such as video/audio conferencing and mobile TV, require the support of multicast. In this article, we study the deployment of HetNets from the...
In the decentralized wireless network, relay transmission is a key transmission technique. By cooperation among the nodes, information is relayed node by node from the source node to the destination node. In a relay transmission system, the use of digital fountain codes can effectively reduce the feedback messages, and greatly improve the forward transmission performance. In this paper, a fountain...
Combining forward error correcting and automatic repeat request is a commonly used method in digital communication system. But in broadcast communication system, this method will compromise the communication efficiency and cause longer transmission delay due to the need of retransmitting data. This problem, however, can be effectively solved by the use of digital fountain code. RS code has the potential...
A unitary space-time cooperative diversity algorithm based on detect and forward method is proposed in this paper. It can be well-tailored for flat-fading channels where neither the transmitter nor the receiver knows the fading coefficients. We can know that the bit error rate (BER) is dependent on the characteristics of the user's individual channel and the inter-user channel between them from the...
Spatial diversity is an effective method to resist fading effect in wireless channel. Due to the limitation of size, weight and cost, it is difficult to use the multi-antenna technique on the terminal of wireless communication. Cooperative communication allows the sharing of antennas among the single antenna mobile terminals to create a virtual multi-antenna, which further leads to the realization...
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