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The speed of the target can be estimated by the sound pressure cross-correlation of the line spectrum of the moving target at different time intervals. However, a slight deviation of the line spectrum has a significant influence on the estimated result. In this paper this phenomenon is analyzed from the theory, then the speed of the target is estimated when the line spectrum is biased. Experimental...
Reverberation is the main interference in active sonar detection, due to its special properties, reverberation suppression is a difficult problem in active sonar signal processing. In this paper, the method of reverberation suppression is studied, and a new method based on the normalization of the beam space data is proposed. The basic idea of this method is to normalize the time waveform of the beam...
Although Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in LTE and other systems, the problem of large band leakage caused by the Doppler effect restricts the further improvement of performance when the user moves at high speed. The Filter bank based multi-carrier (FBMC) technology is one of the effective techniques which could replace OFDM in 5G communication systems...
In the single-mode fiber pull cascaded symmetric slow taper, formation of Mach-Zehnder (M-Z) interferometer, put it into the fiber loop mirror. Theoretical and experimental study on the improvement of its filter characteristics. Loop mirror filter of transmission by M-Z interference and Sagnac interferometer combined with non-coherent superposition, and tuning M-Z interferometer to achieve its tunable...
Considering a broadband co-frequency and co-time full duplex (CCFD) transceiver, which transmits and receives at the same time and frequency resources, the previous studies propose many self-interference cancellation algorithms in the radio frequency (RF) domain, but lack their performance analysis. Therefore, we make an attempt to analyze the optimal self-interference cancellation performance in...
Symmetric α-stable (SαS) distribution noise is widely used to model co-channel and network interference in wireless communication systems. As robust and adaptive techniques, myriad filtering (MyF) and spherically symmetric vector MyF have been applied to suppress univariate and spherically symmetric multivariate SαS distribution noise, respectively. At a communication receiver, the received band-pass...
Indoor localization has been actively researched in recent years due to the increasing demand for location-awareness services. However, to balance localization accuracy and system cost is always a challenge for indoor localization systems. Radio frequency identification (RFID) is a promising technology to achieve both goals, because of its reasonable cost and reliability. In this paper, we propose...
Teaching-learning-based optimization (TLBO) algorithm is a new intelligence algorithm. It takes evaluation scheme which updates learners' grade totally in solving multi-dimensional function optimization problems, thus decreases the convergence speed. Moreover, the interference phenomena among dimensions would influence the quality of solutions. While all existing improvement strategies on TLBO introduce...
An error transfer chart is introduced to trace the iterative process of the decision feedback equalizer for the single-carrier modulation. In the investigated iterative MF-DFE structure, the forward filter is set to the matched filter to maximize the signal power, while the feedback filter is used to cancel the inter-symbol interference. MMSE detection is applied to minimize the decision error power...
Broadcast is an efficient way of delivering same content to a group of UEs. Two kinds of MBMS bearers were defined for broadcast over LTE: MBSFN for large area broadcast, SC-PTM for single cell broadcast. However, neither bearer is efficient in small area broadcast. This paper proposes two new MBMS bearer types SA-PTM and CoMP-PTM for efficient small area broadcast. SA-PTM enables synchronized SC-PTM...
In this paper, we study a new full duplex relaying (FDR) network in which the relay has a buffer and works in decode-and-forward (DF) protocol. We investigate the performance of three models in terms of throughput, i.e., Full duplex relay without buffer-aided (conventional FDR), full duplex relay with unlimited buffer, and full duplex relay with limited buffer, respectively, and derive the closed-form...
In LTE, the Interference over Thermal Noise (IoT) level is useful for operator to determine the link budget for coverage optimization. However, it is difficult to achieve the desired IoT operating point with the inter-cell power control solution in LTE. In this paper, a novel dynamic inter-cell power control scheme is proposed with enhanced X2 signaling to achieve the desired IoT operating point,...
In cognitive networks, cognitive radios utilize spectrum sensing technology to avoid interference to primary users. There are two important factors associated with spectrum sensing: detection probability and false alarm probability. The higher the detection probability, the better the primary users are protected. On the other hand, for cognitive radios the lower the false alarm probability, the more...
The impact of an imperfect channel estimation on the amplify-and-forward (AF) mode cooperative communications systems is studied, with some important factors, including the probability characteristic of the secondary user's end-to-end signal-to-noise ratio (SNR), the outage probability, the symbol error probability (SEP) and the lower bound on the capacity, etc, being analyzed. As compared to the...
Heterogeneous deployment is a promising solution to enhance both system capacity and coverage, where the planned macro cell is overlaid with pico cells. However, higher transmit power of macro eNB (MeNB) results in small coverage for pico cell, which causes insufficient offloading from macro cell to pico cell and inefficient cell splitting gain exploration. Cell range expansion (CRE) is one of alternative...
Heterogeneous networks (HetNets) are expected to be one of the major performance enhancement enablers of LTE-Advanced. Due to significantly challenging interference scenarios, enhanced inter-cell interference coordination (eICIC) based on almost blank subframes (ABS) is the key technology enabler that makes HetNets a reality. The key factor determining the gain of ABS-based eICIC is the configured...
Femtocells are low-power user-deployed base stations that operate in licensed spectrum and provide high-quality cellular service in indoor environments. However, there may be severe cross-tier interference between femtocells and macrocells. In this paper, our focus is on downlink traffic channel interference management for macrocell users. We propose a novel interference management scheme in macro-femto...
Pico cell has been brought to cellular networks as a new technology to deliver cost-effective coverage and capacity to hard-to-reach places, and also increase capacity by cell splitting in hotspots with very dense phone usage. However, according to existing strongest receiving signal association method, pico cells with the extremely low transmitting power are significantly limited in the presence...
Under the co-channel deployment of indoor Home-eNB (HeNB) with closed-subscriber-group (CSG) access mode and Macro-eNB (MeNB), it is very important to mitigate downlink (DL) interference toward Macro user equipments (UEs) which are located in the vicinity of a HeNB. For this scenario, based on discussions in 3GPP standardization, power setting of HeNB is recommended to be the primary DL inter-cell...
In view of the new feature after introducing the relay nodes (RNs) into the conventional cellular networks, a novel soft frequency reuse (SFR)-based inter-cell interference coordination (ICIC) scheme is proposed in the relay enhanced cellular networks. On the basis of original ICIC scheme for conventional cellular network, RNs in the proposed SFR scheme reuses part of neighboring cell-edge bands to...
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