In this article, a configurable and highly flexible four-level pulse amplitude modulation (PAM4) serializer/deserializer (SerDes) simulation system based on field-programmable gate array (FPGA) is designed, which can simulate all bit rates currently supported by actual chips, such as 112 Gb/s. Compared to software systems, the efficiency of hardware greatly improved. This allows parameterized configuration, when paired with CPU, it save data from various stages. Therefore, help integrated...

Time jitter analysis is an important means to evaluate the performance of a high-speed serial communication system. Clock data recovery (CDR) critical component link that recovers reference clock from signal for analysis. Traditional studies focused on CDR technology non-return-to-zero pattern based hardware design, but little work has been devoted software especially four-level pulse amplitude modulated (PAM4) encoded signals. This study proposes new algorithm recover clocks PAM4 signals...

The precision of satellite positioning system depends largely on the numbers and geometric layout satellite, GDOP is one important parameters to measure satellites. From perspective GDOP, relation between a different pseudo-satellite location for accuracy has been studied. For four pseudo-satellites, simulation analysis relationship parameter changes with longitude, latitude user. Studies have shown that latitudes, symmetrical distribution good accuracy; same layout, low-latitude, less than...

The development of satellite positioning technology has solved the problem precise in broad outdoor space, and location service (LBS) gradually become an indispensable part people's life work. However, since signals are shielded by buildings indoor environment, cannot achieve environment. Most existing systems need to be equipped with additional devices, which increases cost hardware purchase maintenance. At same time, map production needs manually drawn, takes a lot time manpower. In order...

High-frequency vibration in the process of launching and complex environmental conditions outer space generate micro deformation components cameras. As a result, images from cameras are blurred. Therefore, it is necessary to measure deformations various experiment conditions.

Software clock data recovery (CDR) is a critical component of high-speed serial link that recovers the reference from signal, which are generally used in real-time sampling oscilloscopes and electronic design automation software. The common method for calculating period to extract rising falling edges then calculate difference between adjacent transition edges, so pulse width sequence obtained. By performing statistics on this sequence, it can be found value position first peak statistical...

Abstract In this paper, a decision feedback equalizer (DFE) re-decision algorithm for 6-level pulse-amplitude-modulation (PAM6) high-speed transceiver is proposed. PAM6 two-dimensional (2D) modulation. The four outer points are not used in the 2D constellation diagram to reduce output power. Although will be modulated, they may encountered during demodulation. This paper considers above situation and theoretically analyzes DFE module under additive white Gaussian noise (AWGN) channel....

ESPAC method is a rapidly emerging field of seismological research, which can reflect the physical properties Earth’s medium. In process using method, sometimes noise original data relatively large, and raw each seismometer needs to be preprocessed, including operations such as de-averaging, de-trending, re-sampling, normalization, filtering. The selection normalized bandwidth filter are particularly important, it will produce wrong result if not handled properly. This article attempts use...

Services based on indoor navigation and localization play crucial roles in people's daily life, they are even more important for individuals with visual impairments. In this paper, an system CoFINLo three key techniques: 1) dynamic feature extraction, 2) incremental model update, 3) fine-grained trajectory generation, is proposed to implement robust friendly interaction design especially impairment groups. Compared other systems, the can overcome obstacles caused by diverse sensing devices,...

Time jitter is an important means for evaluating the performance of high-speed communication systems. Current digital designs require faster edge speeds and smaller effective data windows. Therefore, analysis root cause has become key factor in determining success or failure a design. To analyze source whole link, usually extracted analyzed by software hardware at receivers. verify accuracy extraction receivers, many instrument manufacturing companies have developed oscilloscope to inject...