Journal ArticleDOI
Modulated Coded OFDM Systems with Special Precoder
Xin-Lin Huang,Gang Wang,Fei Hu +2 more
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TLDR
This work proposes a novel modulated coded OFDM system with special precoder that is robust to spectral nulls and with reduced cyclic prefix length, and simulation results show that the proposed OfDM system performance is better than precoded OFDM and VOFDM system.Abstract:
Orthogonal frequency-division multiplexing (OFDM) has been considered as a strong candidate for next-generation wireless communication systems to achieve high rate data transmission in a mobile environment. However, the performance of OFDM systems may be degraded when inter-symbol interference (ISI) channels have spectral nulls, and the data rate overhead due to the insertion of cyclic prefix is high when ISI channels have many taps. Recently, the precoded OFDM systems and vector OFDM (VOFDM) systems were proposed to combat these two problems, respectively. We propose a novel modulated coded OFDM system with special precoder that is robust to spectral nulls and with reduced cyclic prefix length. The precoder can be easily formulated by channel coding and digital modulation. This precoding scheme uses the redundancy information introduced by channel coding (such as zeros inserted in precoded OFDM system). It is able to remove the spectral nulls of an ISI channel without knowing the ISI. Simulation results show that our proposed OFDM system performance is better than precoded OFDM and VOFDM system.read more
Citations
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Journal ArticleDOI
A Novel Haar Wavelet-Based BPSK OFDM System Robust to Spectral Null Channels and with Reduced PAPR
TL;DR: A novel BPSK OFDM system based on Haar wavelet transformation to show robustness to spectral null channels and derive the bit error rate (BER) performance in theory from unbalanced QPSK modulation is proposed.
Proceedings ArticleDOI
Optimal packet size design for multimedia transmissions in cognitive radio networks
TL;DR: An optimal packet size search method for multimedia transmission over multi-channel link in multi-class cognitive radio networks and results show that the proposed scheme is more energy efficient.
Haar Wavelet-Based OFDM System With Reduced Paper for Different Modulation Techniques Bitra
TL;DR: In this article, the authors proposed a novel BPSK OFDM system based on Haar wavelet transformation, which operates decomposition over the data symbol sequence after binary-to-complex mapping shows that half of the datasymbols are zeros and the rest are either −√2 or − √2.
Proceedings ArticleDOI
PAPR reduction in Precoded OFDM system via carrier interferometry
TL;DR: The carrier interferometry (CI) techniques are proposed to use in the Precoded-OFDM systems, which will reduce the PAPR values by spreading all information symbols through all subcarriers with CI phase offset.
References
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Book
OFDM for Wireless Multimedia Communications
Richard van Nee,Ramjee Prasad +1 more
TL;DR: In this paper, the authors present a comprehensive introduction to OFDM for wireless broadband multimedia communications and provide design guidelines to maximize the benefits of this important new technology, including modulation and coding, synchronization, and channel estimation.
Journal ArticleDOI
Precoded and vector OFDM robust to channel spectral nulls and with reduced cyclic prefix length in single transmit antenna systems
TL;DR: A precoded OFDM system that may improve the performance of the OFDM systems for spectral null channels and a size K/spl times/x1 vector OFDM (VOFDM) systems that reduce the cyclic prefix length by K times compared to the conventional OfDM systems.
Journal ArticleDOI
Novel semi-blind ICI equalization algorithm for wireless OFDM systems
TL;DR: A novel semi-blind ICI equalization scheme using the joint multiple matrix diagonalization (JMMD) algorithm to greatly reduce the intercarrier interference in OFDM is proposed and can achieve significantly better performance with symbol error rate reduction in several orders-of-magnitude.
Journal ArticleDOI
Synchronization techniques and guard-band-configuration scheme for single-antenna vector-OFDM systems
TL;DR: It is shown by analysis that the pre-fast Fourier transform algorithms for timing estimation and carrier-frequency synchronization in the conventional OFDM framework can be extended straightforwardly to vector OFDM with comparable performance.
Journal ArticleDOI
Iterative decoding and demodulation for single-antenna vector OFDM systems
Hong Zhang,Xiang-Gen Xia +1 more
TL;DR: Low-complexity demodulation schemes that employ linear cancellation and feature linear complexity in terms of the vector length are proposed and compared and demonstrate how the choice among the presented schemes and thevector length affect the convergence rate and the achievable performance of the iterative receivers.
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A novel Haar wavelet-based vector BPSK–OFDM robust to channel spectral nulls and with reduced cyclic prefix length and PAPR
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