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Performances and capacity of MIMO-OFDM systems are enhanced with adaptive MIMO techniques such as Demmel condition number based switching algorithm. In this paper we show that the complexity of this algorithm can be reduced by using the 2-norm condition number of the channel matrix as the selection metric. Simulation results show that using this selection criterion, the switching algorithm offers...
High Peak to Average Power Ratio (PAPR) is a critical issue in multi-carrier communication systems using Orthogonal Frequency Division Multiplexing (OFDM), as Second Generation Terrestrial Digital Video Broadcasting (DVB-T2) system. This problem can result in large performance degradation due to the non-linearity of the High Power Amplifier (HPA) or in its low power efficiency. In this paper, we evaluate...
Power consumption is becoming a concern in programmable logic design as the size and performance of modern FPGAs increase. Data-parallel applications can work on different parallelism level so as to achieve different performance. This paper presents an investigation into the best parallelism degree-operating frequency tradeoff in order to find the optimum number of instances for each parallelizable...
In this paper, focusing on identifying standards blindly, we propose a bandwidth shape sensor and a GI (guard interval) sensor using USRP (Universal Software Radio Peripheral) platforms and SDR4all tools. These sensors are fundamental parts of the so-called Blind Standard Recognition Sensor. The blind standard bandwidth sensor is based on a Radial Basis Function Neuronal Network designed in Matlab...
We propose in this paper, a timing analysis of dynamic partial reconfiguration (PR) applied to a NoC (network on chip) structure inside a FPGA. In the context of a SDR (software defined radio) example, PR is used to dynamically reconfigure a baseband processing block of a 4G telecommunication chain running in real-time (data rates up to 100 Mbps). The results presented show the validity of our methodology...
It has been widely shown that the sphere decoding can be used to find the maximum likelihood (ML) solution with an expected complexity that is roughly cubic in the dimensions of the problem. However, the computational complexity becomes prohibitive if the signal-to-noise ratio is too low and/or if the dimension of the problem is too large. That is why another technique denoted as fixed-complexity...
This paper presents the ANR project IDROMel, which aims at developing reconfigurable SDR (software defined radio) and cognitive radio (CR) equipments. IDROMel is a 3 years project that started in 2005 and finishes in 2009. The main objective of IDROMel is to define, develop and validate a powerful SDR and CR platform combining very last technology progresses. The platform includes software parts (reconfigurable...
This letter proposes a quasi optimum maximum likelihood detection technique based on Geometrical Diversification and Greedy Intensification (GDGI). The presented detector scheme is shown to achieve almost optimal performance for all signal-to-noise ratio (SNR) values and a cubic computation complexity in the problem dimension. It possesses a regular structure well suited for hardware implementation...
A cognitive radio is the final point of software-defined radio platform evolution : a fully reconfigurable radio that changes its communication modules depending on network and/or user demands. His definition on reconfigurability is very broad and we only focus on the heterogeneous reconfigurable hardware platform for cognitive radio. software defined radio (SDR) basically refers to a set of techniques...
The hardware design and implementation of cyclotomic Fast Fourier Transform (FFT) over finite fields GF(2m) is described. By reformulating the algorithm presented in [8], we introduce a hardware interpretation to design a highly parallel and parameterized architecture of the cyclotomic FFT. Based on four stages and modular structure of last stage, this architecture can operate at different throughput...
Adaptive image coding scheme are well adapted to multirate cognitive networks. A Cognitive device will be able to reconfigure itself to adapt its baseband radio transmitter to the required bit rate of the coding scheme. In this paper, a such platform able to adapt the radio access technology (RAT) to the image coding scheme is described. To optimize the RAT bit rate to the image coding bit rate, our...
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