We propose and experimentally demonstrate a novel modulation scheme called superposed pulse amplitude (SPAM) which is low-cost, insensitive to non-linearity of light emitting diode (LED). Multiple optical pulses transmit parallelly from different spatial position in the LED array overlap linearly free space realize SPAM. With arrangement, experimental results show that using we proposed data rate 120 Mbit/s with BER 1 × 10(-3) can be achieved an blue filter RC post-equalization.

According to our experimental observation, the effect of dead time caused by quenching circuit single photon avalanche diode (SPAD) devices could affect system performance significantly. Hence, we propose a corresponding synchronization scheme and fast blind union detection (FBUD) algorithm for received photon-counting pulse waveform considering time. To verify proposed theory under long distance turbulence fading channel, demonstrate SPAD-based visible light communication with red...

In the underwater visible light communication (VLC) system, single-photon avalanche diode (SPAD) can expand distance. However, output signals from practical SPADs under dead time limit are not Poisson distributed. this paper, generalized likelihood block detection (GLBD) receiver is developed for SPAD-based VLC system with on-off keying modulation. The proposed detect data sequence without any prior knowledge of channel and background radiation. Correspondingly, a fast search algorithm GLBD...

In this letter, we propose a Global navigation satellite system (GNSS) spoofing suppression method based on correlation peak cancellation (SCPC). The approach estimates the signal from baseband sampling sequence, and generates reverse sequence to suppress GNSS attack. Based this, receiver scheme with SCPC function is proposed by adding module general model. experimental verification conducted TEXBAT dataset. By comparing peaks, carrier-to-noise ratio trajectories of spoofed, mitigated...

For the long distance single photon avalanche diode (SPAD)-based underwater visible light communication (UVLC) system, multiple-symbol union detection scheme is presented. However, an error floor curve of bit-to-error ratio (BER) occurs and cannot vanish even though transmitted power approaches infinity. In this paper, to solve problems channel estimation in SPAD-based UVLC we propose one training symbol maximum likelihood (ML) receiver. First, add head each frame eliminate ensure reliable...

The single photon avalanche diode (SPAD) receivers are used for long-distance transmission owing to the high sensitivity and detection efficiency. However, dead time caused by quenching circuit makes output of practical SPAD devices not Poisson distributed. In this paper, after considering effect, we first propose multiple-symbol (MSD) theory SPAD-based visible light communication (VLC) system. addition, design a weak experiment system with red light-emitting (LED) status indicator device....

The underwater wireless optical communication (UWOC) system bit- error-rate (BER) performance in ocean is limited mainly by oceanic absorption and scattering. In this paper, we study the single photon avalanche diodes (SPAD) based UWOC systems with non-return-to-zero on-off keying (NRZ-OOK) modulation. To analyze performance, first get modulation of SPAD-based considering nonparalyzable deadtime limit. Moreover, practical maximum likelihood detection threshold for system. Our analytical...

Underwater visible light communication (UVLC) has a very wide application prospect in ocean exploration. The single photon avalanche diode (SPAD) can expand system distance. In this paper, we study the SPAD based UVLC systems performance under dead time limited. To analyze BER performance, first get model of practical limit. Then, set up long-distance VLC on double exponentials decay. Furthermore, maximum likelihood detection methods different modulation schemes for are proposed. simulation...

With the rapid development of cognitive radio technology, multilayer heterogeneous computing platforms with large computing, high-throughput, ultralarge bandwidth and ultralow latency have become a research hotspot. Aiming at core scheduling problems platforms, this paper abstracts bidirectional interconnection topology, node capacity, internode communication capability platform into an undirected graph model nodes dependencies, nodes’ requirements, requirements in streaming tasks directed...

In order to give full play the high parallel and efficiency characteristics of heterogeneous signal processing platforms, relevant scholars at home abroad have proposed many task scheduling algorithms with their own advantages improve efficiency. However, for communication intensive tasks, existing deployment methods are no longer applicable because higher requirements delay becomes key limit performance platform. For communication-intensive this paper proposes a load balancing method based...

In recent years, with the popularization of 5G communication technology and rapid growth data traffic network bandwidth, aiming at problem large CPU (Central Processing Unit) processing burden low occupancy in protocol processing, this paper uses TOE (TCP Offload Engine) to implement on ZYNQ hardware. is unload TCP/IP execute it hardware, convert C/RTL (Register Transfer Level) code through high-level integrated HLS (High Level Synthesis). The results show that accelerated method based can...

Global navigation satellite system (GNSS) has been widely used around the world, but problems like low signal intensity or blocked could often cause users unable to collect enough for position purpose. A pseudolite geolocation is designed which can worked instead of non-line-of-sight (NLOS) satellites, cooperate with on orbit GNSS satellites. We detailed a novel consists and working progress. Through application scenario analysis simulation we verified that pseudorange errors main factor...