Method and apparatus for interleaver synchronization in an orthogonal frequency division multiplexing OFDM communication system. WOA2 en. AUPSA0 en. FRA1 fr. Procede d'estimation de canal par projection sur des familles orthogonales de construction particuliere et recepteur correspondant.
Incremental redundancy transmission for multiple parallel channels in a MIMO communication system. CNC zh. Apparatus and method for carrier frequency offset estimation and correction in a wireless communication system. Method and system for estimating and compensating non-linear distortion in a transmitter using data signal feedback.
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JPB2 ja. JPA ja. USA1 en. KRA ko.
CNA - 对时变信道进行跟踪的方法和装置以及通信网络 - Google Patents
EPA1 en. KRB1 ko. CAA1 en. The intended readers of this book include both engineers as well as students whose main area of interest or line of work lies in the design and integrated circuits implementation of wireless communication ICs, with an emphasis on the integration of an entire radio system on a chip. SpreadSpectrum Communications. RF System Design. Radio System Design.
The large reconfiguration space is key toward simultaneous optimization against spectrum, angle of incidence and polarization. The measured optimized responsivity and noise-equivalent-power NEP across 0. The figure compares the optimized performance across the frequency range against a static configuration for broadside incidence at 0.
The green line represents the overall sensor performance as the detector states are optimized for each incident frequency. The red line represents the sensor performance across frequency for a fixed optimal configuration at 0. As can be seen, active reprogramming of the sensing surface allows significant enhancement of sensitivity, including 8.
The spectrally dependent nature of the distribution of the incident power is evident. The figure also shows the optimized detector settings for the two cases at 0. We also show the overall reconfigured response across angles that allows the sensor to achieve a high response across wide angles of incidence, while being directive for a given configuration.
As shown in the Fig. The programming of the surface effectively tilts the reception beam towards the angle of incidence allowing electronic scanning across 0. It is possible to utilize the establishment of such multiple reception beams across the spectrum to create orthogonal measurements for computational-based real-time imaging, though we have not implemented this in this work Such reconfiguration can be achieved if we vary the polarization keeping the spectrum and angle of incidence constant. The achievable performance obtained across spectrum, angle of incidence and polarization, are comparable to a collection of state-of-art sensors, each custom designed within a specified range of these parameters 30 , 31 , 32 , 36 , The experiments demonstrate the ability of such multiport electromagnetic structures with direct programming of the sensing interface to allow for dynamic optimization against incident field properties.
Combining these ranges of reconfigurability with sensor fusions can allow for low-cost, robust, versatile, and compact THz sensing and imaging technology. The ability to allow a single chip-scale THz sensor to reconfigure simultaneously against the incident field properties can significantly advance THz sensing and imaging. The sensing surface, described here, allows reconfiguration for reception across 0. Being able to sense THz waves with high sensitivity across frequency ratio can enable hyperspectral imaging with both high lateral and depth resolution.
Sensor fusions across multiple orthogonal domains including frequency, beams, and polarization can allow for superior image registration, and is steadily growing in importance in other spectral domains. This degree of reconfigurability is critical for practical THz sensing systems, where a single modality interface typically does not suffice.
By moving from a single-antenna and single-detector interface to a multiport continuous aperture, it is possible to overcome the grating lobe issues allowing frequency and pattern diversity at the same time. This can allow fast image acquisition, hyperspectral and multi-angle imaging, and computational techniques in the THz regime for real-time imaging. The challenge to engineer such programmability is exacerbated by the fact that chip-scale devices are limited in their cutoff frequencies f max.
The approach of mapping electromagnetic and sensor properties from a large reconfiguration set also opens up a new design space. By merging multiple functionalities within a single electromagnetic structure such as, impedance matching and radiating surface in this work , new sensor architectures can emerge. Optimization methods in passive device design, albeit in the photonic domain, has been shown to have yield competitive performance against classical design approaches, but has the potential to open up a new class of optical devices The computational and distributed subwavelength sensing approach also opens up previously unexplored questions on optimal antenna shapes and detector co-design methodologies in such massively multiport structures, and also new techniques and systems in the optical domain 61 , 62 , 63 , Unlike a static antenna whose shape and boundary condition determine its electromagnetic properties, here, both the structure and the detectors, including their sizing and locations determine the overall responsivity.
While we choose a log-periodic structure as the THz sensing surface, its use for spectral reconfigurability is quite unlike its more traditional use as a wideband interface with a single center port excitation. In fact, in this work, no signal is drawn from the center port at all see Fig. It can be noted that while in this work we investigate the position, location, and configuration of the detector set for the desired set of reconfigurable parameters based on the choice of the log-periodic tooth surface, an interesting direction for future exploration is the space of co-design of the geometry of the surface and sensory interface.
Given the importance of reconfigurability and sensor fusion for robust THz imaging and sensing, we expect the space of programmable designs can lead to future THz sensors with added capabilities. While evidently, this is not as frequency selective as a coherent system, it does overcome the frequency range limited by the tunable nature of such sources in addition to the reconfigurability against incidence angle and polarization. However, this trade-off space is worth investigating for future work to explore further the design parameters and their cross-dependence beyond the ones we have addressed in this work.
Their operation at room temperature with extremely low power is also important for future applications where power, compactness, and programmability are critical considerations. Eliminating complex optical instrumentation and integration of such programmable functions in a chip-scale form is expected to have significant impact in both technology and application development in the THz spectrum.
The Main Types of Chips Produced by Semiconductor Companies
The log-periodic tooth antenna is realized on a 1. The biasing voltage and resistors are optimized for minimizing NEP across 0. The digitally controllable impedance are realized with capacitor banks with multiple digitally controlled NFETs in parallel as shown in Supplementary Fig. The control signal of the capacitor bank is a 4-bit thermometer code provided by the bit shift register. The chopped rectified THz signals are processed on-chip with integrated amplifiers Supplementary Fig.
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They are realized with integrated transistors as shown in Supplementary Fig. The measurement setup is shown in Supplementary Fig. The signals are generated with frequency multiplier bank across 0. The entre system is automated for fully autonomous optimization against the incidence field properties. The data that support the findings of this study are available from the corresponding author upon reasonable request. Sengupta, K.
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Terahertz integrated electronic and hybrid electronic-photonic systems. Duling, I. Terahertz imaging: revealing hidden defects. Photonics 3 , — Song, H. Present and future of terahertz communications. IEEE Trans. THz Sci. Nagatsuma, T. Advances in terahertz communications accelerated by photonics. Photonics 10 , — Woolard, D. Terahertz frequency sensing and imaging: a time of reckoning future applications.
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