Proceedings ArticleDOI
Enhanced equalization in OFDM systems using cyclic prefix
Ahmed A. Quadeer
- pp 40-44
Reads0
Chats0
TLDR
It is demonstrated that how the cyclic prefix can be used to enhance the operation of an OFDM equalizer when the channel is perfectly known at the receiver or is obtained through training.Abstract:
Orthogonal frequency division multiplexing (OFDM) is a modulation technique that provides high achievable data rates in wireless environment by combating multipath effects and has relatively simple implementation. In this paper, it is demonstrated that how the cyclic prefix can be used to enhance the operation of an OFDM equalizer when the channel is perfectly known at the receiver or is obtained through training. This method relies on transforming the OFDM channel into two subchannels (circular and linear) that share the same input and are characterized by the same channel parameters. Conventionally, data is recovered by utilizing only the circular subchannel while in this method, both the circular and linear subchannels are used to recover the data. The improved performance of the proposed method is demonstrated with the help of simulations for constant modulus as well as non-constant modulus data.read more
Citations
More filters
Posted Content
Deep-Waveform: A Learned OFDM Receiver Based on Deep Complex-valued Convolutional Networks
TL;DR: It is shown that linear Deep Neuron Networks could learn transformations in signal processing, thus master advanced waveforms and wireless channels.
Journal ArticleDOI
Deep-Waveform: A Learned OFDM Receiver Based on Deep Complex-Valued Convolutional Networks
TL;DR: This work demonstrates the capability of deep neural networks in processing OFDM waveforms and the results suggest that the FFT processor in OFDM receivers can be replaced by a hardware AI accelerator.
Journal ArticleDOI
A Factor Graph Approach to Exploiting Cyclic Prefix for Equalization in OFDM Systems
TL;DR: Simulation results show that the proposed approach achieves a significant gain over the conventional approach and the turbo equalization system converges within two iterations and SNR analysis is provided to justify the performance improvement.
Turbo equalization and its applications
TL;DR: Various equalization algorithms are proposed with the aim of exploiting the prefix redundancy for data detection and channel estimation based on the linear minimum mean square error (LMMSE) principle.
Proceedings ArticleDOI
Enhanced data detection in OFDM systems using factor graph
TL;DR: This paper takes advantage of the prefix redundancy and utilizes it in the soft-input soft-output equalizer of a turbo equalization system and achieves significant gain compared to the conventional approach.
References
More filters
Journal ArticleDOI
Wireless multicarrier communications
TL;DR: This article develops a systematic discrete-time framework and designs novel systems for single- and multiuser wireless multicarrier communications-a field rich in signal processing challenges that holds great potential in various applications including audio/video broadcasting, cable television, modem design, multimedia services, mobile local area networks, and future-generation wideband cellular systems.
Journal ArticleDOI
Pilot-symbol-aided channel estimation for OFDM in wireless systems
TL;DR: The pilot-symbol-aided parameter estimation for orthogonal frequency division multiplexing (OFDM) systems is highly robust to Doppler frequency for dispersive fading channels with noise impairment even though it has some performance degradation for systems with lower Dopple frequencies.
Journal ArticleDOI
Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems
TL;DR: This paper proposes novel channel estimators to combat both the noise and the out-of-band interference in orthogonal frequency-division multiplexing (OFDM) systems.
Journal ArticleDOI
Optimal training signals for MIMO OFDM channel estimation
Hlaing Minn,Naofal Al-Dhahir +1 more
TL;DR: This paper presents general classes of optimal training signals for the estimation of frequency-selective channels in MIMO OFDM systems and designs can be applied to pilot-only schemes as well as pilot-data-multiplexed schemes.
Proceedings ArticleDOI
Pilot-symbol-aided channel estimation for OFDM in wireless systems
TL;DR: In this article, a minimum mean-square error (MWE) estimator for a 10% word error rate (WER) is derived for the typical urban channels with 40 Hz and 200 Hz Doppler frequencies.