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Millimeter-wave communication in 60 GHz band is considered a promising technology to meet the explosive growth of data demand in Wi-Fi based WLAN. To address potential blockage for 60 GHz signals, multiple APs are proposed for such WLAN. This paper addresses the important problem of AP assignment and transmission scheduling for a multi-AP 60 GHz WLAN. We propose two AP assignment schemes with different...
In this paper, matched-field localization with a single vector hydrophone is researched. In condition of ideal waveguide, the sound pressure field and vertical velocity were analyzed theoretically. The relationship between acoustic pressure field and vector field achieved that a vector hydrophone can be equivalent to vertical two element array with a certain vertical aperture. The depth of vector...
In through-the-wall target localization area, wall effect including absorption and refraction will arise, wall effect needs to be compensated. If wall parameters including thickness and dielectric constant are exactly known, the target can be compensated to its correct position. In this paper, based on the transmitting model of through-the-wall radar, we deduced the Cramer-Rao lower bound (CRLB) of...
In order to counteract hostile communication based on the advanced Orthogonal Frequency Division Multiplexing (OFDM) technology, an efficient and unrecognizable jamming technique by failing the OFDM cyclic prefix (CP) functionality is developed in the paper. CP is introduced into OFDM systems to prevent interference caused by the multipath fading, as long as it is no shorter than the channel delay...
A novel photonic stretch receiver for synthetic aperture radar is developed and experimentally demonstrated. The photonic receiver is proved in a microwave anechoic chamber, and evaluated through inverse SAR imaging tests in a field trial.
ZigBee is a widely used wireless technology in low-power and short-range scenarios such as Internet of Things (IoT), sensor networks, and industrial wireless networks. However, the standard ZigBee supports only one data rate, 250Kbps, which thoroughly limits ZigBee's efficiency in dynamic wireless channels. In this paper, we propose Mrs.Z, a novel physical layer design to enable multi-rate selection...
In this paper, Bluetooth is used as the data transmission mode to achieve the connection between the power transmitter and the mobile phone in the wireless charging system. A Bluetooth module is added to the power transmitter to send the relevant data to the mobile phone in the process of wireless power transfer. Both the power transmitter and the power receiver are designed based on the Qi standard...
This paper proposes an improved method for DBN, by means of introducing the detachment rate. The introduction of detachment rate can play a similar average role, and can make the complex relationship between the neurons weakened, so that DBN learning has stronger robustness. Three kinds of data (corresponding to healthy, faulted and deteriorating) were classified by the improved depth belief network...
Millimeter wave (mmWave) is one of the key technology in the fifth generation mobile communication system. In mmWave system, hybrid precoding is applied to reduce the number of radio frequency (RF) chains. Although narrow band multiuser hybrid precoding is widely studied, only a few works focus on wideband hybrid precoding. The main problem is that all subcarrier share the same analog precoding matrix...
Communication, illumination, and energy saving are three basic objectives of visible light communication (VLC) system. However, it's difficult to simultaneously optimize these performances. Therefore, this paper jointly optimizes energy consumption and illumination while communication and other constraints are satisfied. The problem is formulated using multi-objective and multi-control-variable optimization...
Due to the unreliable nature of wireless links, sensor nodes frequently encounter degraded performance or lack of connection. This paper provides a real-time status monitoring and channel error diagnosis method in a wireless sensor network. It uses a poll and echo procedure to efficiently collect some physical layer and link layer statistics from both transmitter side and receiver side. A machine...
In this paper, we investigate the possibility of the use of suprathreshold stochastic resonance system in the physical layer security scheme. The suprathreshold stochastic resonance (SSR) array is used as a preprocessor at the front-end of the legitimate receiver, which reduces the noise in the receiving signal. Analysis in two cases are given, which are (1) the eavesdropper uses the minimum error...
In this paper, we investigate the energy efficiency (EE) of massive multiple-input multiple-output (MIMO) systems with linear maximum ratio combining (MRC) and zero-forcing (ZF) receivers. To be practical, the baseband power consumption with algorithm computational complexity (ACC) is taken into account. Utilizing this model, we maximize the global optimal number of receiver antenna and sum rate with...
Human activity recognition based on wireless signals emerges as a research hotspot recently. Though tremendous efforts have been devoted and significant progresses have been achieved, one fundamental issue still remains open, i.e., theoretical modeling between signal dynamics and human activities. This paper fills in the blank by addressing several theoretical issues and providing insightful mathematical...
In this paper, we study the cache-aided cloud radio access network (C-RAN) with wireless fronthaul, where multiple cache-enabled users are served by multiple cache-enabled transmitters that are connected to a cloud processor through a wireless fronthaul link. We put forth a caching-and-delivery scheme that combines network-coded fronthaul transmission with cache-aided interference management. By broadcasting...
Energy harvesting systems recycling energy from ambient environment for extended lifetime have been proposed to be the next step in the evolution of the Internet of Things. One of the largest challenges of energy harvesting is the insufficiency and instability of ambient energy sources. Unlike wireless distributed systems considered to date, frequent power failures need to be taken into account in...
Compressed sensing (CS) is a promising candidate to lower the sampling rate of ultra-wideband (UWB) signals and CS-based UWB channel estimation is an emerging topic. Due to the noise folding (NF) effect of CS, it is difficult to achieve high channel estimation accuracy. In this paper, a new CS-based channel estimation scheme is proposed to combat the NF effect. The key idea of the proposed scheme...
This paper presents a novel approach for the uplink transmission power control for satellite communication (SATCOM) links that share a transponder's transmission power. The proposed approach provides explicit link margins (LM) for both uplinks and downlinks against losses from various sources that are uncertain in nature. The feature allows the proposed algorithm to work effectively with information...
Information fusion is an important step in cooperative reconnaissance signal processing, which can be divided into three types: data-level, feature-level and decision-level fusion. Data-level fusion has the advantage of information completeness but the large data volume makes it hard to apply practically. Based on the sparse representation of intercepted signal and the correlations between signals,...
This paper considers the problem of physical layer security of a wireless orthogonal frequency division multiplexing (OFDM) communication system. We first develop a transmit filter-aided secure OFDM system scheme which can disturb eavesdropper's receptions by destroying the orthogonality of OFDM signals at the eavesdropper, while the quality of legitimate transmission is maintained. Then, in an effort...
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