As the most widely used standards for wireless local area network (WLAN), IEEE 802.11 are continuously amended by introducing new techniques so as to meet increasing demands. In order verify performance of protocols, simulation is considered a significant method. However, far we know, current tools only either media access control layer (MAC) or physical (PHY). The separate MAC and PHY can hardly evaluate 802.11ax in whole system level authenticity objectivity. Hence, next generation WLAN...

The next generation Internet of Things (IoT) is expected to support extremely diverse applications and terminals, which requires the massive connectivity. Unfortunately, current mobile communication systems with orthogonal multiple access technique can hardly satisfy this demand. On other hand, narrow band property has become trend IoT, however, problem interference alleviation in system difficult be resolved. Recently, sparse code (SCMA), a non- for 5G, shows obvious improvement user...

Massive MIMO is one of the most promising technologies for fifth generation (5G) mobile communication systems. In order to better assess system performance, it essential build a corresponding channel model accurately. this paper, three-dimension (3D) two-cylinder regular-shaped ge

IEEE 802.11 wireless local area network (WLAN) has been increasingly developed over several decades. It requires four times throughput improvement in the next generation WLAN. Thus, researchers focus on co-frequency co-time full duplex technology, which makes devices transmit and receive pac

The ever-increasing data demands and the density of wireless nodes require higher rate in networks. To satisfy requirement, it is necessary to propose novel medium access control (MAC) protocols enhance multiuser channel transmission network. existing studies prove that full-duplex (FD) able improve network capability without any extra bandwidth. However, there are few focusing on FD MAC protocol design for next generation In this paper, a named as MU-FuPlex introduced based our proposed...

The number of base stations (BSs) in remote areas is poor, and seamless coverage cannot be achieved. This paper investigates a cognitive satellite-terrestrial network, including the low earth orbit-beam hopping (BH) satellite terrestrial systems. Besides, weighted capacity-request ratio regarded as quality service (QoS) system, weight indicates channel priority. Similarly, introduced QoS system. By establishing relationship between beams terminals, solution space BH pattern beam power...

The emerging 5G cellular networks will operate at millimeter wave (mmWave) frequency bands to enhance the cell capacity. Massive MIMO antenna array and beamforming technology are used in order overcome propagation limitations of mmWave band. Multi-beam based communication system is considered as basic structure for mobile network. However, optimize capacity, question how many beams required remains unclear. In this paper, considering with massive technologies, we accurately model inter-beam...

Since single satellite capacity is limited for hotspot areas, we propose a dual (DS) cooperative transmission network to increase the number of served cells and improve quality service (QoS) in this article. We study global beam hopping power allocation proposed network, where conflict between cell priority latency balanced. Due impacting both cochannel interference capacity, two multiobjective problems are coupled. The plural method introduced simplify coupled problems, which obtains better...

In this paper, we propose a deep learning aided approach for signal detection in orthogonal frequency-division multiplexing (OFDM) systems with time-varying channels. The method simplifies the architecture of OFDM by treating receivers as black box. We utilize fully-connected neural network (FC-DNN) properly and successfully simulate an end-to-end system. Compared two conventional algorithms well-designed to deal environment, proposed does not need estimate channel parameters detect signals....

In various practical orthogonal frequency-division multiplexing (OFDM) systems, the estimation accuracy at receiver is challenging, and, specifically when operate over time-varying channels. This occurs mostly due to presence of multipath Doppler shifts. Meanwhile, deep learning has quite recently demonstrated its superiority in extracting features information from big data. To this end, paper, a learning-assisted approach for channel refinement proposed OFDM under uplink By...

The multi-channel MAC protocols have been proposed recently to improve the network capacity by accommodating more concurrent transmissions. In this paper, we propose a distributed protocol using reliable multiple channel reservation with only single transceiver. Specifically,

In this paper, a heuristic clique based spatial time division multiplexing access (STDMA) scheduling algorithm is proposed for concurrent transmission in millimeter wave networks. Firstly, on the physical interference model an level caused by one request to another defined, which transforms SINR condition summation form. Then, un-directional conflict graph constructed, feasible of proved corresponding requests group timeslot. Finally, STDMA find maximum scheduled Extensive simulations are...

With the rapid growth of mobile devices and increasingly diverse services, traditional networks can hardly keep up with these trends. This asks for 5G network to support ultra-large traffic guarantee super-massive connections. Recently, millimeter wave (mmWave) backhaul is supposed be a promising technology significantly improve capacity efficiently connect massive end users Internet. However, most studies just study on architecture physical layer technologies mmWave network, few them focus...

With an explosion of wireless mobile devices and services, beam-based communication in 5G heterogeneous network (HetNet) has attracted extensive attention recently due to some potential technologies such as massive MIMO millimeter wave. This paper proposes outage probability analysis framework for beamforming HetNet, which is composed a multi-layer cellular including macrocells small cells. The HetNet affected by base station (BS) densities, transmission powers, beam gains, beamwidths, path...

In practical massive multiple-input-multiple-output (MIMO) system, limited transmitted antennas installed at the base station (BS) cannot guarantee ideal orthogonality and theoretical channel rate thus be achieved. this paper, we consider approximation of for configuration large but finite number BS in a MIMO system. A perturbation matrix is introduced to model non-ideal orthogonality. And then, Taylor expansion determinant utilized derive closed form achievable rate. The convergence...

The ever-increasing demands of wireless traffic call for continuously growing the network capacity or throughput. Carrier sensing threshold adaptation and transmission rate adaptation, two efficient mechanisms improving ad hoc network, have attracted much attention in recent years. However, simply adopting either mechanism can hardly meet expectation that optimizing capacity. In this paper, we investigate joint optimization carrier to improve area (throughput), which is defined as...

Abstract In this paper, a two‐way relay‐aided cognitive satellite terrestrial network (TR‐CSTN) model is proposed, where primary users are located at the edge of base station. TR‐CSTN, one terminal (STUs) selected by fusion center as TR to forward information between two with power TR. Meanwhile, these share licensed frequency band send satellite. Then, given limited spectrum utilization and energy efficiency (EE) communication system, cooperative sensing employed realize green...

Due to the dramatic growth of human demands for wireless business, local area network (WLAN) achieves rapid popularization and world-wide development recently. In order improve efficiency next generation WLAN, especially in dense deployment scenarios, IEEE sets up a new task group named TGax draft out amendment 802.11ax 2014. The motion confirms that Enhanced Distributed Channel Access (EDCA) is still one important method channel access 802.11ax. this paper, we show traditional EDCA...

Single carrier systems with frequency domain equalization have attracted much interest for high data rate communications. In this paper diversity is investigated single ultra-wideband by employing simple maximal ratio combining reception in complex quadratic spreading sequences. Since channels exhibit dense multipaths and strong selectivity, analysis simulation results indicate the proposed system can gain significant performance improvement over traditional systems. Compared multicarrier...

This paper mainly deals with the problems of user grouping in multibeam multicast satellite systems. To maximize system throughput and suppress interference, we studied a load balanced scheme. We first scheme randomly selected centers addressed its shortage. Then, to further improve achievable rate, K-means algorithm based is proposed get more suitable grouping. Furthermore, or without consideration analyzed compared. The simulation results are finally presented demonstrate our can be...

In this paper, the timeslot based traffic scheduling problem is considered with objectives to fairly and energy efficiently serve vehicles. The contact durations between vehicles RSU are slotted into timeslots, during each of which one unit can be transmitted from vehicle, then vehicle's requirement satisfied. downlink cost defined as transmission deliver traffic. fairness strategy evaluated by Jain's index unsatisfied vehicle requirements. proposed formulated a three-step optimization...