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The information transmission problem in a class of wireless multi-user single-antenna half-duplex relay interference networks is studied. In these networks there are multiple clusters of sources. All the terminals in each source cluster desire to transmit independent messages to a single destination, through multiple layers of intermediate half-duplex relays. We adopt a cluster successive relaying...
5G wireless networks are expected to support new applications demanding ultra high reliability and ultra low latency, such as self-driving cars, industrial control, and real-time gaming. Such services are known as ultra-reliable and low-latency communications (URLLC) targeting at 99.999% transmission correctness within 1 ms delay bound. Current Long Term Evolution (LTE) system is far from supporting...
This paper proposes a new radar signal classification algorithm based on auto-correlation function (ACF) and directed graphical model (DGM). The ACFs of analytic radar signals are calculated to magnify the discrimination of signals of different categories. A simple de-noising approach is introduced to purify the ACFs. Four features are extracted from the purified ACF. A DGM is used to represent the...
Targets of inverse synthetic aperture radar (ISAR) are non-cooperate and the motion compensation should be performed first. This paper proposes a method for ISAR motion compensation. In range-frequency domain, the motion of imaging target can be modeled as Chebyshev-polynomial phase function that is an orthogonal polynomial and has more approximation accuracy than Taylor polynomial. With pulse compression,...
Repeater jamming has become an important jamming type for countering coherent radar since it is proposed. In this paper, a coherent noise jamming method based on interrupted-sampling and pseudo-random sequence phase-modulation is proposed against de-chirping radar. The characteristic of jamming signal is analyzed in detail and the processing procedure of de-chirping radar is introduced. After De-chirping,...
Many researchers have recently proposed using LTE to support traffic safety and transportation efficiency applications in vehicular ad hoc networks (VANETs). The deviceto- device (D2D) communication technique underlay LTE network has been considered as an effective way to potentially conduct vehicle-to- vehicle (V2V) communications. Since the vehicular communication environment has different characteristics...
A location based gradual beamforming and soft handover scheme for high speed train (HST) equipped with linearly distributed multi-antennas is presented in this paper. The simple and effective gradual beamforming is done based on the priori location information and achieves the array gain, statistical optimal beamforming and tapered beamforming are both analyzed here. The statistical inter-channel...
The uplink channel in noncooperative cellular networks with distributed multi-antenna sets are considered in this paper. Only matched filter(MF) Receivers is analyzed here, since previous work has shown that the MF receiver performs the same as minimum-mean-square-error(MMSE) receivers when the number of base station(BS) antennas goes to infinite. Compared with the result of co-located case, the multi-user...
We investigate the time-varying Gaussian interference channel (IC) in which each source desires to communicate to an intended destination. For the ergodic time-varying IC with global perfect CSI at all terminals, it has been known that with an interference alignment technique each source-destination pair can communicate at half of the interference-free achievable rate. In practice, the channel gains...
The interference channel (IC) is the basic underlying channel model for many practical multi-terminal communication scenarios. Here, we consider a modified three-user IC with dual-antenna transmitters and receivers where we allow one receiver to have a finite-rate unidirectional link to another receiver. This kind of receiver-to-receiver link may exist in cellular networks with base-station backhaul...
The finite-SNR Diversity-Multiplexing Tradeoff (DMT) problem is studied in the context of spectrum aggregation, where there exist multiple noncontiguous (discrete) spectrum segments each of which has its own power limit. Firstly, we give an optimal power allocation strategy to achieve the ergodic capacity under Rayleigh fading. Secondly, two different coding schemes, i.e., coding without across sub-channels...
Cell range expansion (CRE) by pico eNodeB in heterogeneous networks can reduce the uplink interference effectively at the cost of the downlink interference increasing. It will lead to the system capacity decreasing apparently with a large range expansion bias. In this paper, we propose an asymmetric cell selection scheme for inter-cell interference coordination (ICIC) to solve the problems. The UEs...
We study the error and diversity-multiplexing tradeoff (DMT) performance of a (secondary) multi-user relay network, where a class of finite field network codes are applied in the relays to efficiently provide spatial diversity. To eliminate spectral efficiency loss induced by half-duplex limitation we adopt the cognitive radio overlay spectrum sharing concept and consider aligning the relays' operation...
In this paper, the benefit of rateless codes combining with multi-antenna technique is exploited to provide quality-of-service (QoS) guarantee while maximizing the spectral efficiency in a limited feedback multiuser MIMO downlink. Critical to the design of such a system is the achievement of channel state information (CSI) at the base station (BS) to schedule the optimal users and pre-cancel the interuser...
Cooperative spectrum sensing (CSS) schemes utilizing Compress Sampling (CS) enable efficient and reliable CSS for cognitive radio networks. Existing CSS schemes perform CS by random measurement matrixes, and thus suffer from a loss of efficiency. To counteract this drawback, this letter proposes a CS based CSS scheme using measurement matrix exploring the correlation of the primary spectrum. A reconstruction...
Multi-User Multiple Input Multiple Output (MU- MIMO) technique is introduced into 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) to enhance the system capacity and spectrum efficiency. On the other hand, Coordinated Multi-Point transmission and reception (CoMP) technique which can reduce inter-cell interference (ICI) significantly, has been adopted in LTE-Advanced as one of the...
In this paper, we propose a new user scheduling scheme which can reduce the system feedback significantly for the MIMO downlink system in multiuser cellular networks. The proposed scheme first performs user scheduling according to the valuebook-based scalar feedback of all users' channel gains and then applies block diagonalization (BD) precoding according to the codebook-based matrix feedback of...
In this paper, we propose a method to detect the wake-up-word (WUW) using microphone array for human-robot interaction. The consistency of the spatial eigenspaces formed by the speech source at different frequencies and the resonant curve similarity of the WUW are used as the features for detection. These features are processed and detected separately and the result is determined by cascading individual...
In this paper, we proposed a novel sensing scheme so-called Transmitter-Receiver Cooperative Sensing in a MIMO cognitive network by combining sensing information of both sides. Compared with most of the existing sensing schemes which simply use listen-before talk (LBT) only at the transmitter side, the proposed scheme can further improve the system performance by jointly feedback the Channel State...
In this paper, we consider the adaptive power allocation in the MIMO cognitive network with limited feedback. It is well known that, with the view of guaranteeing the link quality of primary receiver (PRx), the transmit power of second transmitter (STx) is strictly constrained, resulting in that it is difficult to provides QoS guarantee to second receiver (SRx) in the fading channel. This paper focuses...
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