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Using ITU-R P.1546 model for propagation loss prediction of airborne ultrashort wave communication. On this basis, we give the calculation formula of signal to interference ratio of the ultrashort wave communication receiver when the enemy using Gaussian white noise for repressive interference. We also give the calculation method of the bit error rate of the digital communication system when it's...
Current large-scale computing services, such as online social networking and web searching, make the wired links in the data centers with an Ethernet infrastructure oversubscribed. Therefore, researchers consider to augment the data centers with wireless communication, called a hybrid data center network (HDCN), to improve the communication flexibility and network capacity. In this paper, we investigate...
Optimal beamforming on synthetic noise and interference is a flexible and intuitive technique for shaping beam patterns. In this method, suppression of arrivals from undesirable directions is achieved through introduction of synthetic interferences and optimal beamforming using the resulting noise-interference covariance matrix. We apply this approach to a general multiplet line array and test the...
In this paper, a detection method is improved for different types of jamming attacks in wireless networks. Based on the open nature of wireless networks, wireless networks are susceptible to jamming attacks. Most detection methods cannot provide effective protection against different types of jamming attacks. In order to effectively improve the defense capability of the wireless network, to identify...
Device-to-device (D2D) communication brings significant benefits to improve resource utilization and users' throughput as an underlay to cellular networks. This paper first proposes an efficient admission policy based D2D clustering scheme to increase the system rate. By analyzing the interplay between the D2D clusters and the arrival user who intends to join a D2D cluster, we present two attraction...
In cognitive radio technology, detecting accurately primary users can improve the efficiency of cognitive radio (CR) network and reduce interference with primary users. This paper proposes a communication method of avoiding interference with hidden terminal in CR network. It determines the location and coverage of primary transmitter through the ranging, and then avoids effectively interference with...
To further increase the experienced data rate per user, and to overcome the poor indoor penetration and the presence of dead-spots, the network architectures with relays, picocells and femtocells underlaying the macrocell network which are commonly referred as heterogeneous networks have drawn more and more researching interests. One of the main challenges of heterogeneous networks is the severe inter-cell...
This paper utilizes an adaptive modulation and coding (AMC) scheme and compares the performance of adaptation between single-user multiple input multiple output (SU-MIMO) and multi-user (MU) MIMO with that of SU-MIMO. In long term evolution (LTE), every UE only needs to feed back SU-MIMO rank 1 channel quality indicator (CQI) which could get feedback overhead and computational complexity reduction...
Proportional fair (PF) scheduling is a widely used technique in recent wireless communication systems. However, scheduling will also bring about a lot of signaling overhead especially in OFDMA based systems which have many subchannels, assigning these subchannels to users and feeding back channel quality information to Base Station produce much overhead. In many situations, neglecting the overhead...
OFDM has become one of the most important Beyond-3G transmission technologies. Mobile WiMAX is a typical representative of OFDM systems. The cross-layer optimization problem of inter-cell coordinated resource allocation for OFDM systems is addressed in this paper. We first analyze the problem by utility-based method, and formulate this optimization problem. Then the globally optimal and a sub-optimal...
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