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Channel mismatch has become a serious limit to further improve the anti-jamming performance on satellite navigation antenna arrays receivers. Consistency degree of each channel could directly determine the anti-jamming performance. In order to analyze and confirm the channel consistency indexes, this paper analyzes the impact of channel mismatch on interference cancellation ratio (ICR), firstly. According...
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...
The design of the media access control (MAC) protocols for mobile underwater acoustic networks (UANs) poses significant challenges due to the characteristics of underwater acoustic channels such as limited bandwidth, high bit error rate and long propagation delay. The reasons that existing underwater MAC protocols have shown poor performance, to a great extent, lie in the following aspects: 1) the...
The millimeter wave spectrum is widely studied as one of the most important resources for the IMT (International Mobile Telecommunication) system towards to the 5G for the large bandwidth. In this paper, its investigated the propagation characteristics of 28GHz millimeter wave using Ray-Tracing in Chengdu city of China. Both the close-in-reference and floating intercept path loss fitting methods combining...
Active sonar system performance in the presence of strong direct blast, or reverberations from the projected waveform, is considered. The presence of these reverberations may severely limit target detection performance and the applicability of the continuous active sonar (CAS) paradigm. Signal processing approaches to detect objects of interest and estimate relevant target parameters are described...
In signal processing applications such as wideband beamforming or multiple-input multiple-output systems, the parameters we wish to estimate can occur in groups. These groups are defined by the system design and known a priori. However, the parameters within the group are often not phase coherent, therefore the standard method is to non-coherently integrate the appropriate groups to maximize signal...
To bridge the widening gap between computation requirements and communication efficiency faced by many-core chips, Wireless Network-on-Chip (WiNoC) has been proposed by using ultra-wideband interconnect. While prior research has demonstrated the salient features of WiNoC as high perlink data rate, high accumulated bandwidth, high flexibility, low overhead and low power consumption, this research aims...
Parabolic trough receiver, the key component in the parabolic trough solar thermal plant, must maintain vacuum condition in order to guarantee high thermal efficiency. It must be used for 25 years. Based on the structure and operation environment of parabolic trough receiver, the factors affecting the vacuum lifetime are analyzed. Then accelerate degradation tests are developed to analysis the vacuum...
Multistatic active sonar systems involve the transmission and reception of multiple probing sequences, which provide a basis for extraction of target information in a region of interest. Since the multiple probing sequences act as interferences to one another, adaptive receiver filters are needed for interference suppression. Two adaptive receiver designs, namely the iterative adaptive approach and...
This paper focuses on mobile multi-input multi-output (MIMO) underwater acoustic communications (UAC) over double-selective channels suffering from both inter-symbol interference and Doppler scaling effects (stretching or compression). Temporal resampling is implemented to effectively convert the Doppler scaling effects to Doppler frequency shifts. Then an extension of the sparse learning via iterative...
Linear minimum mean-squared error (LMMSE)-based channel equalization is widely used in multi-input multioutput (MIMO) underwater acoustic communications (UAC). The practical challenge of LMMSE based schemes is the necessity of matrix inversion which generally imposes heavy computational burden on the receiver. To obtain the LMMSE filters efficiently, we exploit the conjugate gradient method and the...
Active sonar systems involve the transmission and reception of one or more sequences, which provide a basis for extraction of the information on targets in the region of interest. The probing sequences at the transmitter and signal processing at the receiver play crucial roles in the overall system performance. We consider herein using CAN (cyclic algorithm-new) to synthesize probing sequences with...
Effective training sequences and reliable channel estimation algorithms are essential for enhancing the performance of multi-input multi-output (MIMO) underwater acoustic communications (UAC). Also, effective interference cancellation schemes are crucial for reliable symbol detection. In this paper, the problem of designing MIMO training sequences is considered. Moreover, we present a sparse learning...
This paper introduces the configuration and components of a solar absorber receiver in the parabolic trough solar power system. The failure or degradation of the receiver, mainly including glass-to-metal sealing failure, loss of vacuum and degradation of solar selective coating, is the single largest cost factor for current and future solar power plant. The article elaborates the principle of glass-to-metal...
We consider improving the performance of orthogonal frequency-division multiplexing (OFDM)-based mobile broadband wireless communication (MBWC) systems over time-varying frequency-selective fading channels. To battle the problem related to frequency-selective fading, we can use space-time block coding (STBC) on each OFDM subcarrier. To battle the problem related to time varying as well as that related...
This paper focuses on the channel estimation and symbol detection problems in multi-input multi-output (MIMO) underwater acoustic (UWA) communications. To enhance channel estimation performance, a cyclic approach for designing training sequences and an iterative adaptive approach (IAA) for estimating the channel taps are presented. Sparse channel estimates can be obtained. by combining IAA with the...
Compared to traditional phased-array radar, multiple-input multiple-output (MIMO) radar can offer better parameter identifiability and higher resolution, enable the direct applicability of adaptive techniques for effective interference and jamming suppression, and allow for much flexibility for transmit beampattern design and waveform optimization. Reaping the full benefit of the superior performance...
In this paper, we introduce two novel successive interference cancellation (SIC) algorithms for multiuser detection (MUD) in direct-sequence code-division multiple-access (DS-CDMA) systems. One is proposed for receivers in the downlink and the other for receivers in the uplink. The downlink SIC algorithm is a blind MUD which consists of two parts: estimating the signature sequences and amplitudes...
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