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Quadrature downconversion impairments should be taken into account and compensated to the increasing of the Direct Conversion Receiver (DCR) reception quality. DC-offset and I/Q-imbalance are fitted into this group. Experimental estimation of two relatively simple compensation methods for the indicated drawbacks is reviewed in the paper. Energy efficiency and computational complexity estimation are...
Multirate Alter banks have become excellent solution for future wireless communication system. Filter bank based multicarrier system provides high spectral efficiency through removal of redundant information resulting in efficient use of available spectrum. In multicarrier communication system, filter bank based transmultiplexer (TMUX) having same analysis and synthesis filter bank is employed. Efficient...
Filterbank multicarrier modulation (FBMC) has been identified as a strong contender for dynamic spectrum access in the TV White Space, as FBMC transceivers are able to control out-of-band interference level without compromising flexible usage. This paper compares FBMC receiver architectures, providing performance and complexity analysis, based on closed form expressions and on an actual implementation...
Next generation wireless communication systems, such as 3GPP LTE-Advanced and ITU IMT-Advanced, are demanded to support 1Giga-bit per second (Gbps) peak data rate. Compared with traditional systems, 1Gbps high throughput systems have some different difficulties in system design and hardware implementation. This paper mainly presents some important design criterions and novel methods on parameter design...
In this paper, we present a prototype FPGA design for an efficient physical layer implementation of a MIMO-OFDM technique. We implement multi-channel MIMO-OFDM systems using single Fast Fourier Transform block that is shared across modulations for the system. Our experimental results show that the proposed implementation saves at least 60 percent of the hardware resources, while achieving the same...
In this paper, we present an FPGA implementation of an improved channel estimation technique for the OFDM based WiMAX systems. The proposed technique is a modified version of the well-known MMSE technique. The implementation minimizes the complexity of the accurate MMSE based channel estimator by making use of sets of previously calculated filter coefficients in estimation. The hardware architecture...
This paper describes a Field Programmable Gate Array (FPGA) implementation of a Digital Front End (DFE) block for a Multi-Carrier Multi-Antenna (MCMA) system. The decimation/ interpolation filters used for obtaining the required channel bandwidth are split into several low order decimation/ interpolation stages, each of them being implemented as a polyphase filter. At the receiver, the DFE contains...
Carrier Frequency Offset (CFO) estimation and correction is a critical issue in all OFDM receivers. For WiMAX Physical layer it is even more challenging to introduce a suitable CFO sub-system since WiMAX system supports complex features for future applications such as multiuser, multi-access and high mobility operation. This paper is concerned with low cost hardware implementation of CFO sub-system...
This study is focused on the field programmable gate array (FPGA) implementation of a reconfigurable fast Fourier transform (FFT) operator able to provide Fourier transforms both over infinite complex field C and Galois finite field GF. This reconfigurable FFT exploits to a great advantage the possibility to share hardware resources when considering multi-standard scenario for software radio systems...
We present the design and implementation of a FPGA prototype for a 300Mbps 2 x 3 MIMO-OFDM transceiver that forms a complete IEEE 802.11n wireless LAN. We also demonstrate that the developed system provides robust and high-data-rate performance.
This paper presents a FPGA implementation of an OFDMA modem for the physical layer of LTE technology, suitable for both uplink and downlink transmission. The designed structure achieves a low area occupation while fulfilling LTE requirements.
OFDM Wireless systems are currently in the focus of research and development. High hardware cost of such systems is an initiative to redesign the critical functional blocks in order to satisfy timing and power constrains as well as to minimize overall circuit complexity and cost. One such critical functional block is the CoOrdinate Rotation DIgital Computer (CORDIC) that can be used in various applications...
In this paper, a neural network (NN) for peak power reduction of orthogonal frequency-division multiplexing (OFDM) signals is improved in order to suppress its computational complexity. Numerical experiments show that the proposed NN has less computational complexity than the conventional one. The number of IFFT in NN can be reduced to half, and the computational time can be suppressed by 32.7%. From...
This paper presents a model-based register transfer level (RTL) design of a 4times2 multiple-inputs multiple-outputs (MIMO)-orthogonal frequency domain multiplexing (OFDM) wireless communication systems transmitter and its field programmable gate array (FPGA) implementation. This system provides a maximum of 600 Mbps with 20 meter of propagation distance using 80 MHz baseband bandwidth with 4times2...
This paper proposes a novel preamble structure and a timing synchronization method for OFDM systems. The preamble structure has both properties of delayed and symmetric correlations which can afford accurate time and frequency synchronization simultaneously. A new timing metric is also proposed according to the preamble structure, which is the production of the modulus of delayed and symmetric correlation...
Multiple-input multiple- output (MIMO) and orthogonal frequency division multiplexing (OFDM) are two key techniques for broadband wireless mobile communications. In order to provide accurate channel state information (CSI) to support MIMO-OFDM transmission in doubly-selective fading channels, we propose the robust channel estimator based on two-dimensional enhanced discrete-time Fourier transform...
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