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This paper presents an analytical performance investigation of the capacity limits of correlated multiple-input single-output (MISO) channels in the presence of quality-of-service (QoS) requirements. Exact closed-form expression for the effective capacity of correlated MISO channels is derived. In addition, simple expressions are obtained at the asymptotic high and low signal-to-noise ratio (SNR)...
The root mean square (RMS) delay spread and coherence bandwidth are examined based on measurement for a wide band human body channel. Using the results, the relation between these two wideband channel parameters is evaluated. The inter-symbol interference (ISI) effect on the performance of the frequency selective digital transmission (FSDT) is investigated by modeling the time dispersive human body...
Chaotic sequences, as a kind of pseudorandom sequences, have been widely used. But some well known chaotic sequences, such as Henon sequence, have poor autocorrelation performance, and their applications are limited. Based on recently presented APAS theorem, we modified Henon map to S-Henon map, and S-Henon sequence has excellent autocorrelation performance and simple structure, whereas its other...
Based on differential properties of the received preamble, a novel start of packet (SoP) detection and synchronization approach is developed for the IEEE802.11n MIMO-OFDM WLAN system to obtain better mean and variance of timing estimates and lower missing packet and false alarm rates.
Power supply noise is very important in delay testing. Excessive noise can cause circuit delay increases that lead to test overkill. Test patterns that are too quiet can lead to test escapes. In this work, we introduce a realistic low cost delay test compaction flow that guardbands circuit delay during test using a sequence of estimation metrics. Significant reductions in CPU time are demonstrated...
Chaotic sequences have been widely used as pseudorandom sequences. But some well known chaotic sequence has poor autocorrelation, or after modulation, autocorrelation performance become poor, and their applications are limited. Such as TD-ERCS sequence, not only has poor autocorrelation performance, but also its RFM signal has poor autocorrelation, too. Based on recently presented APAS theorem, we...
This paper presents a temporal method for direction of arrival (DOA) estimation for wideband sources by using an antenna array. Existing DOA estimation algorithms treat the problem in frequency domain by decomposing the wide spectrum of these signals in several narrowband signals, and use a narrowband DOA estimation methods to solve the problem. These methods suffer from high computational complexity...
The effect of process variations on the clock skew in three dimensional (3-D) circuits with multiple clock domains is investigated. In 3-D ICs, the combined effect of inter-die and intra-die process variations should be considered in the design of clock distribution networks. A statistical clock skew model incorporating spatially correlated intra-die process variations is employed to describe this...
The cross-correlation and auto-correlation operations are important in many signal processing tasks. Often these operations are resource intensive or limited by noise in low-power systems. In this paper we present the design and measured results of an analogue integrated circuit (IC) that performs cross-correlations using a neuromorphic algorithm.
This paper presents a double directional analysis of vehicle-to-vehicle channel measurements conducted in three different traffic scenarios. Using a high- resolution algorithm, we derive channel parameters like Angle-of-Arrival (AOA), Angleof- Departure (AOD), propagation delay and Doppler shift and identify underlying propagation mechanisms by combining these estimates with maps of the measurement...
In this paper the joint effects of the inter-cell macrodiversity schemes combined with intra-cell spatial multiplexing are investigated for MIMO-OFDM systems. We compare the SINR and throughput performances of cellular Alamouti, cellular cyclic delay diversity (CDD) schemes and pure macrodiversity at the cell edge. Our simulation results indicate that cellular Alamouti scheme outperforms cellular...
Short-range wireless audio transmission with high quality on the one hand often encounters error-prone channels, while on the other hand decoding delay plays a critical role in the application. A lot of prior art in audio error concealment is either only intuitively motivated or adds too much delay to the transmission. In this paper we propose a framework for transmitted audio error concealment without...
A patient-specific seizure prediction algorithm is proposed that extracts novel multivariate signal coherence features from ECoG recordings and classifies a patient's pre-seizure state. The algorithm uses space-delay correlation and covariance matrices at several delay scales to extract the spatiotemporal correlation structure from multichannel ECoG signals. Eigenspectra and amplitude features are...
Allocating bit-widths is a necessary step in high-level synthesis. The main disadvantages of past methods, such as dynamic analysis or affine arithmetic, lie in low efficiency and coarse results which may lead to huge execution time and unnecessary additional bits for representation. In this paper, an algorithm is based on static analysis is proposed to perform range analysis and allocate integer...
The motivation for this study is the need for careful analysis of aperiodicity of the excitation component in expressive voices. The paper proposes analysis methods which can preserve the excitation information corresponding to sequence of impulse-like excitation with variable strengths. To analyze the details of the excitation source characteristics, the epochs and the strength of the excitation...
For orthogonal frequency division multiplexing (OFDM) systems in multipath channels, the detection of the first path is desirable to avoid inter-symbol-interference (ISI). However, the conventional peak detection of the cyclic prefix (CP) correlation curve can detect the strongest path but not the first path, while the largest slope detection is sensitive to background noise. This paper presents a...
For joint MIMO-OFDMA link adaptation and scheduling, channel quality feedback needs to be quantized, sparse and irregular. For flexible scheduling, prediction of the quantized channel at the base-station is needed. We propose measurement of 3D channel correlation parameters by the terminals and signalling back to the base station, which enables prediction of the quantized channel by multi-dimensional...
Multi-site measurements for urban macro cells at 2.66 GHz are performed with three base stations and one mobile station. In order to analyze the correlation properties of large scale parameters, we split up the routes into subsets, where it can be assumed that wide-sense stationarity (WSS) applies. The autocorrelation distance and correlation properties of large scale parameters for each link are...
Channel sounding, channel modeling and their parameter extraction in particular considering MIMO configurations, plays an important role for todays realistic wireless system design and evaluation. The analysis of the gathered channel sounding data has to match the specifics in the measurement system configuration. Within this contribution directional antenna arrays are used at both sides of the measured...
Multiple-Input Multiple-Output (MIMO) techniques have recently become an important research field for enhancing the performance of in-home Power Line Communication (PLC) systems by exploiting the additional Protective Earth wire. The development of such systems requires an accurate description of the propagation channel. This paper presents a statistical model for the MIMO PLC channel, based on an...
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