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This paper proposes a fast and low-complexity retransmission scheme for Industrial WLAN system. The proposed scheme exploits the frequency diversity and employs channel selectivity in order to achieve high-reliability and low-latency communication. The channel selectivity is carried out instantly by re-scheduling sub-carrier allocation during OFDM transmission in order to obtain diversity gain. Evaluation...
This paper discusses about feasibility study on global services recognition system for 3GPP GSM, UMTS, LTE, and IEEE 802.16d/e. we investigate the feasibility of preamble and synchronization signals as agents of services availability. To detect those signals, we propose the architecture consists of symmetric based auto-correlation, cross-correlation, filtering, and decision maker. Based on our estimation,...
We propose a new least squares based estimation algorithm for carrier frequency offset and frequency dependent I/Q imbalance compensation with very low complexity for direct conversion receivers. Compared to conventional algorithms, our proposed estimation has considerably lesser computation due to a reduced order least squares step. Simulation results show that the proposed algorithm has about 1...
In this paper, we present a model-based register transfer level (RTL) design of a simple joint parameter method for carrier frequency offset and I/Q imbalance estimation. The estimation scheme is based on a proposed algorithm that uses only two short training symbols for faster estimation. The simple yet robust algorithm is then optimized for field programmable gate array (FPGA) implementation. Simulation...
This paper introduces a novel algorithm for jointly estimating carrier frequency offset and I/Q imbalance for OFDM systems. The new algorithm is a closed form solution to obtain the frequency offset and I/Q imbalance parameters in the absence of noise. In the presence of noise, the proposed algorithm uses the least squares algorithm to accurately estimate the parameters. The proposed algorithm is...
This paper proposes a simple algorithm for joint estimation of carrier frequency offset and I/Q imbalance. The reduced complexity algorithm is derived from a closed form solution of the carrier frequency offset and I/Q imbalance parameters given two identical training blocks. The proposed algorithm also uses the least squares algorithm to give accurate estimate in the presence of noise. It was shown...
This paper presents a simple algorithm for jointly estimating carrier frequency offset and I/Q Imbalance parameters. The reduced complexity algorithm used is previously proposed as an estimation algorithm using 2 long training symbols of the 802.11 a preamble containing 64 samples each. We have shown in this paper that using two short training symbols for faster and less complex estimation scheme...
In this paper we report our works on designing MIMO wireless LAN system with throughput 600 Mbps for 30 meter propagation range by using Generalized Layered Space Time (GLST) coding and its implementation on field programmable gate array (FPGA) chips. At the receiver we employ our low-complexity GLST decoder to maintain error performance with low computational complexity. A novel packet format is...
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...
In this paper, we present two register-transfer level (RTL) designs of physical layer-baseband (PHY-BB) for IEEE802.11n wireless local area network (WLAN) system. One is two antennas model which is able to achieve 144 Mbps with 20 MHz bandwidth, and the other is four antennas model which is able to achieve 600 Mbps with 40 MHz bandwidth. We engineer them applying a model-based design process (MBDP)...
This paper presents a mobile radio system for frequency domain equalization (FDE) applied to single carrier (SC) modulation solutions to combat the effects of multipath fading channels. SC modulation has reduced peak-to-average power radio requirements to OFDM, enabling the use of less costly power amplifiers. SC modulation performance with FDE is similar to that of OFDM, even for very long channel...
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