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On-chip optical communication infrastructure has been proposed to provide higher bandwidth and lower power consumption for the next-generation high performance multicore systems. Online calibration of these optical components is essential to building a robust optical communication system, which is highly sensitive to process and thermal variation. However, the power consumption of existing tuning...
We demonstrate, for the first time, a multimodal multiphoton microscope using chirped intensity modulation to construct line images from a single element detector.
An angular sliced LG beam rotates +90 or −90 degree and maintains the fan shape and spiral phase in the far field. It enables a new scheme of spatial-mode division multiplexing system in free space communication.
Abstract--- In this paper, the application of MPSK modulation to physical-layer network coding (PNC) with multiple antennas scheme is investigated. A linear complexity scheme with the capacity of achieving diversity is proposed assuming symbol- level synchronization only. In the proposed scheme, called symbol-based PNC, the constant amplitude of MPSK modulation symbols is exploited and the product...
In this paper, we study the sensitivity and robustness of Space Shift Keying (SSK) modulation to imperfect channel knowledge at the receiver. Unlike the common widespread belief, we show that SSK modulation is more robust to imperfect channel knowledge than other state-of-the-art transmission technologies, and only few training pilots are needed to get reliable enough channel estimates for data detection...
Shortcomings of the traditional bit error rate (BER) analyzing method of digital communication systems are analyzed. Based on the amplitude probability distribution (APD) principles which are introduced in this paper, the method is improved. The error probability algorithm, which contains amplitude and phase elements of interference signals, of binary digital communication system based on APD is also...
In this paper we compute the capacity and the pragmatic capacity of aeronautical telemetry shaped-offset quadrature phase-shift keying (SOQPSK-TG). In the pragmatic approach, SOQPSK-TG is treated as a modulation scheme as opposed to an encoder, and no iterations are performed between the SOQPSK-TG demodulator and the outer binary decoder. We also evaluate the capacity of SOQPSK-TG constrained on a...
A symbol-based physical layer network coding (PNC) scheme is proposed for the two-way relay channel where the relay node is equipped with multiple antennas. Unlike the traditional binary PNC that focuses mainly on BPSK modulation, the proposed symbol-based PNC is tailored for the general MPSK modulation. In particular, the product of the two modulated signals is considered as a network-coded symbol,...
This paper presents a configurable MIMO detector with QR decomposition and channel interpolation for 4×4 MIMO-OFDM systems. QR decomposition (QRD) processor and MIMO detector are usually investigated independently in the literature; however, this methodology usually limits operating condition to only slow fading channel. Therefore, this study jointly designs a hardware architecture for QR decomposition...
The first challenging step of the demodulation of the DVB-S2 signal with function of VCM (Variable Coding and Modulation)/ACM (Adaptive Coding and Modulation) is the detection of the Physical Layer (PL) header. PL header is transmitted using π/2-BPSK modulation and is composed of a fixed part (26 bits of Start Of Frame (SOF)) and a variable part (64 bits codeword of PL Signaling (PLS) code that defines...
A novel optical linearization approach for intensity modulated analog links based on equivalent incoherent combination technique has been experimentally demonstrated. The highlight of this scheme is the destructive combination for the distortion signals in electrical domain, which can be easily achieved through a commercial balanced photodetector pair. A reduction of 25dB in third-order intermodulation...
In this paper, we study an enhanced subspace based approach for the mitigation of multiple access interference (MAI) in direct-sequence code-division multiple-access (DS-CDMA) systems over frequency-selective channels. Blind multiuser detection based on signal subspace estimation is of special interest in mitigating MAI in CDMA systems since it is impractical to assume perfect knowledge of parameters...
In this publication a fully integrated multiprobe reflectometer at 122 GHz is presented. It can be used for readout of resonator-based dielectric sensors for measurement of chemical, biological, or medical liquids. The circuit consists of a voltage-controlled oscillator, an amplitude modulator, a capacitive tapped line, four power detectors, and a dummy sensor. The circuit is operated from a 3.75-V...
In cognitive radio (CR), spectrum sensing is a key enabling functionality to discover the vacant spectrum which is not occupied by primary systems. With good sensing capability, secondary users can effectively recycle the spectrum resource without disturbing active primary users. Energy detector (ED) is a commonly used and relatively simple spectrum sensing technique. In realistic environments, the...
A system for the synthesis of backing vocals by pitch shifting of a lead vocal signal is presented. The harmonization of the backing vocals is based on the chords, which are retrieved from an accompanying instrument. The system operates completely autonomous without the need to provide the key of the performed song. This simplifies the handling of the harmonization effect. The system is designed to...
This paper considers novel receiver structures for linearly precoded MIMO-OFDM systems, making special emphasis on soft detection principles. After reviewing the operation of MMSE detectors, an optimal iterative soft receiver based on list sphere detection (LSD) is proposed. This scheme provides the best possible performance from an error rate point of view at the expense of a rather high computational...
One major goal for future wireless communication systems is a uniform user experience. In order to solve this problem, additional relay nodes can be used to support the communication. Up to now mainly two relaying functions are considered, namely Amplify-Forward (AF) and Decode-Forward (DF). DF can either mean a channel decoding at the relay or a hard decision directly on the received signal which...
A low-complexity, effective detection method for multiple-input multiple-output (MIMO) systems based on eigenspace search and linear equalization-based detection schemes is proposed in this paper. Based on the observation that solutions yielded by linear detectors are corrupted by color noise, the proposed method introduces a new constellation search procedure to augment linear detectors. Specifically,...
A key issue in the full-rate two-relay cooperative communication systems is the interference which is caused by the simultaneous transmission of the source and one of the relays at any time. In this paper, we exploit the interference signal at the destination to develop a maximum likelihood (ML) detector for decode and forward full-rate cooperative systems. It is shown that the Viterbi algorithm can...
In this paper, Sphere Decoding (SD) algorithms for Spatial Modulation (SM) are developed to reduce the computational complexity of Maximum--Likelihood (ML--) optimum detectors, which foresee an exhaustive search of the whole search space and have a complexity that linearly increases with the product of number of transmit--antenna, receive--antenna, and size of the modulation scheme. Three SDs specifically...
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