Bit error probability for a M-ary QAM OFDM-based system

Wyk, J.H. van; Linde, L.P.

doi:10.1109/afrcon.2007.4401578

Cited by 25 publications

(14 citation statements)

References 23 publications

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“…Furthermore, in the demodulation of data symbols, the most likely errors caused by noise involve the erroneous selection of nearest data symbols. Under these assumptions, the average probability of symbol error (also bit error) for ICI self-cancellation scheme is described as in [20][21][22] by…”

Section: Probability Of Errormentioning

confidence: 99%

A Spectrally Efficient Intercarrier Interference Reduction Scheme for Orthogonal Frequency Division Multiplexing Systems in Low Signal-to-noise Ratio Environment

Kumar¹,

Pandey²

2013

IETE J Res

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The inherent sensitivity of orthogonal frequency division multiplexing (OFDM) systems to any frequency shift in the signal makes their design very challenging. In OFDM systems, the frequency shift may be due to instability of transmitter/ receiver oscillators or because of fading channel. The frequency shift in the signal destroys the orthogonality among subcarriers and results in intercarrier interference (ICI), which affects the system performance severely. A number of solutions are available to mitigate the effect of ICI. The existing ICI mitigation techniques include frequency equalization, time domain windowing, ICI self-cancellation, coding, etc., Among several ICI reduction methods, ICI self-cancellation scheme has received much attention due to its simplicity. The ICI mitigation schemes that depend on carrier frequency offset (CFO) correction at the transmitter are effective under high signal-to-noise ratio (SNR) scenario and those that depend on CFO estimation and correction at the receiver have additional computational complexity and some sort of data symbol redundancy. In this paper, a bandwidth-efficient ICI reduction method for M-ary QAM signals is proposed. The present method is effective in low SNR environment. This method reduces the effect of ICI and improves the performance of the system in terms of bit error rate. It is shown that the proposed ICI cancellation method considerably outperforms the existing ICI self-cancellation schemes in the presence of small CFO while maintaining the throughput level.

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Section: Probability Of Errormentioning

confidence: 99%

A Spectrally Efficient Intercarrier Interference Reduction Scheme for Orthogonal Frequency Division Multiplexing Systems in Low Signal-to-noise Ratio Environment

Kumar¹,

Pandey²

2013

IETE J Res

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“…Its error performance is loosely speaking equal to 4-QAM, as the transmitted constellation points are from a 4-QAM modulator given by Eq (5) [4].…”

Section: Ber Calculationmentioning

confidence: 99%

SubCarrier Index - QAM, A New Hybrid Modulation Scheme for OFDM

Irfan

Saputra²,

Shin³

2015

The Proceedings of the 2nd International Conference on Industrial Application Engineering 2015

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In this paper, we present a new hybrid modulation scheme based on quadrature amplitude modulation (QAM) and the idea behind frequency shift keying (FSK) for multicarrier systems. The proposed scheme is a request based modulation scheme where the QAM modulated message signal bits are encoded to different subcarriers based on the message signal bits. This way the subcarrier index also carries some message signal bits without its physical transmission. Perfect utilization of all subcarriers is assumed. The proposed scheme shows considerable improvement in spectral efficiency.

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“…OFDM is the modulation technique used in many new broadband communication schemes, including digital television, digital audio broadcasting, DSL/ADSL and wireless LANs. It also allows digital data to be efficiently and reliably transmitted over a radio channel, even in multipath environments [11][12][13]. In OFDM, although sub-carriers overlap, this does not create any problem since they are orthogonal, that is, the peak of one occurs when that of others are at zero.…”

Section: Introductionmentioning

confidence: 99%

Implementation of BER Performance in SFBC/STBC Based On QAM-OFDM Detection Techniques in OFDM Systems

Saraswat¹,

Mishra²,

Vyas³

et al. 2015

IJAREEIE

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ABSTRACT:Cooperative wireless communication relay networks in OFDM-based systems have been shown to improve performance in various systems using digital modulation techniques as a form of spatial diversity, this method indeed improves the performance in comparison in various aspects of BER and SNR with fixed and random values of input applied on functions on FFT, IFFT, mixing of each other etc. to existing when filtering is necessary for band limited conditions. In this proposed paper, we are implementing the better and updation in results with the mathematical calculation in FFT, IFFT, and mixing of algorithms and terminology interfacing over the range of 256 and 512 -ary QAM OFDM techniques which are useful in communication scenarios. Scattering and conjugate plots are added for 256 and 512ary are implemented for orthogonal transmission, overlapping, narrow band sub channel or sub-carriers, transmitted in parallel data over transmission bandwidth.

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Bit error probability for a M-ary QAM OFDM-based system

Cited by 25 publications

References 23 publications

A Spectrally Efficient Intercarrier Interference Reduction Scheme for Orthogonal Frequency Division Multiplexing Systems in Low Signal-to-noise Ratio Environment

A Spectrally Efficient Intercarrier Interference Reduction Scheme for Orthogonal Frequency Division Multiplexing Systems in Low Signal-to-noise Ratio Environment

SubCarrier Index - QAM, A New Hybrid Modulation Scheme for OFDM

Implementation of BER Performance in SFBC/STBC Based On QAM-OFDM Detection Techniques in OFDM Systems

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