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The challenges and issues related to the application in IEEE 802.11ac systems of lattice reduction (LR) techniques for the implementation of successive interference cancellation (SIC) receivers in single-user (SU) and multi-user (MU) orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) transceivers are investigated in this paper. The shown simulation results, validated...
This paper introduces a novel class of linear soft-input soft-output detectors with boosted communications performance. The detector showed an SNR gain of up to 2.4 dB compared to state-of-the-art linear detectors. We introduce a low-complexity algorithm tailored for VLSI implementation, and propose a suitable architecture. The developed ASIC demonstrates the feasibility and efficiency of the concept,...
An ultra-resolution high-sensitivity preclinical PET/CT - MuPET is designed and manufactured. The detector system is a triacontagon shape which is very close to a perfect cylindrical ring. The inner diameter of the ring is 165 mm and the axial length is 116 mm. The detector system is using 180 PMT-quadrant-sharing (PQS) blocks - 30 blocks per ring and 6 rings axially with 210 low-cost round PMTs for...
This paper presents a TCM scheme that uses a new expanded 16-Dimensional Constant Envelope Q2PSK constellation along with a simple convolutional encoder of rate 2/3. An effective gain of 2.67 dB over uncoded CEQ2PSK is achievable with low complexity, and without suffering from constellation expansion penalty. Larger coding gains are easily achieved with encoders of higher rates. In addition, an optimal...
A novel beam-forming detector for group space-time coded systems is proposed in this paper, which utilizes unitary preprocessing in the transmitter to simplify the decoding complexity in the receiver. Eigenmode selection is introduced to achieve more system diversity gain. Furthermore, a simple example for variable-rate group space-time coded systems is presented. Simulation results show that the...
This paper studies the performance of a new coded multi-carrier code-division multiplexing (CMC-CDM) scheme in a wireless LAN (WLAN) context, employing different interleaving approaches. It is found that for high data rate transmission the proposed system has the potential to achieve power efficient PER performance using low complexity receivers. For example, equal gain combining (EGC) may be used...
Linear equalizers (LEs) have been widely adopted for practical systems due to their low computational complexity. However, it is also well known that LEs provide inferior performance relative to a maximum-likelihood equalizer (MLE) or other near-MLEs, because LEs usually cannot collect the diversity order enabled by the transmitter and at the same time they lose mutual information. More importantly,...
The recently developed IEEE 802.16e specifications for broadband wireless access include three multiple-input multiple-output (MIMO) profiles employing 2??2 space-time codes (STCs) and two of those are mandatory on the downlink of mobile WiMAX systems. One of these is full rate, and the other is full diversity, but neither of them has both of the desired features. The third profile, which is not mandatory,...
Orthogonal frequency division multiplexing (OFDM) is the modulation scheme of choice for digital video broadcasting-handheld (DVB-H), which is required to operate under high mobility conditions resulting in significant Inter-carrier Interference (ICI). To mitigate ICI, several cancellation schemes have been proposed but they require reliable channel information at the receiver which is quite challenging...
In this paper, a novel approach using frame-based iterative channel fading parameters estimation technique from the received data sequence exploiting orthogonal property of the space-time block (STB) code is proposed. For practical implementation of STB code, the receiver requires to estimate these parameters. Regarding this type of estimation, the inherent orthogonal nature of STB code can be exploited...
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