Linear MMSE Frequency Domain Equalization with Colored Noise

Li, Baojin; Wang, Xinbo; Lu, Guoquan; Chang, Yanxun

doi:10.1109/vetecf.2007.249

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…where the weight matrix W can be obtained from the minimum mean square error (MMSE) criterion [7] as…”

Section: Fractionally-spaced Frequency Domain Linear Equalizationmentioning

confidence: 99%

“…Due to the application of the relay node, the delay spread of the effective transmitter-relayreceiver multipath channel is longer than that of the direct transmitter-receiver channel, which increases the complexity of channel equalization at the receiver. To reduce the computational complexity of channel equalization, a fractionallyspaced frequency domain equalizer (FS-FDE) [7] is designed in this paper.…”

Section: Introductionmentioning

confidence: 99%

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A frequency domain equalizer for amplify-and-forward underwater acoustic relay communication systems

Nguyen

Rong

2013

2013 9th International Conference on Information, Communications &Amp; Signal Processing

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Abstract-In this paper, we apply the amplify-and-forward relay technique to simultaneously increase the range and data rate of underwater acoustic communication by dividing the channel between transmitter and receiver into two hops. Due to the application of the relay node, the delay spread of the effective transmitter-relay-receiver multipath channel is longer than that of the direct transmitter-receiver channel, which increases the complexity of channel equalization at the receiver. To reduce the computational complexity of channel equalization, a fractionally-spaced frequency domain equalizer (FS-FDE) is designed in this paper. Simulation results illustrate that compared with the direct path communication, significant bit-error-rate performance improvement can be achieved through using relay technique in underwater acoustic communication.

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“…where the weight matrix W can be obtained from the minimum mean square error (MMSE) criterion [7] as…”

Section: Fractionally-spaced Frequency Domain Linear Equalizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A frequency domain equalizer for amplify-and-forward underwater acoustic relay communication systems

Nguyen

Rong

2013

2013 9th International Conference on Information, Communications &Amp; Signal Processing

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“…However, due to the suppression of filters, the noise transmitted into the MMSE FD-FSE is no longer white but colored. 9,10 In this case, the conventional MMSE FD-FSE based on AWGN would degrade the system performance. Therefore, an autocorrelation matrix of filtered noise is introduced into MMSE FDE to cope with colored noise in a known channel.…”

Section: Introductionmentioning

confidence: 99%

Enhanced frequency-domain fractionally spaced equalization for coherent optical transmission system with colored noise

Hao

Liu

et al. 2017

Opt. Eng

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An enhanced minimum mean-square-error (MMSE) frequency-domain (FD) fractionally spaced equalizer (FSE) for polarization demultiplexing is proposed in the presence of colored noise. The 2-norm of the estimated channel matrix and polynomial fitting of equalization coefficients are introduced to mitigate the colored noise without requiring knowledge of the optical and electrical filtering. Simulation results show that ∼3-dB improvement of equalization performance is achieved compared to conventional MMSE FD-FSE in an 8 × 112-Gbit∕s wavelength-division multiplexing polarization-division multiplexing-quadrature phase shift keying transmission system over a 1200-km single mode fiber link.

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“…In wireless fading environments, FS introduces diversity and can improve signal detection. However, FS operation also results in colored noise [20] and this phenomenon gradually saturates the performance gain due to FS [17,19]. Therefore, it is important to determine the operating point for the FS rate, a design parameter that we can actually configure to find a good trade-off between performance and complexity.…”

Section: Introductionmentioning

confidence: 99%

Eigenvalue-Based Sensing and SNR Estimation for Cognitive Radio in Presence of Noise Correlation

Sharma

Chatzinotas

Ottersten

2013

IEEE Trans. Veh. Technol.

103

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Herein, we present a detailed analysis of an eigenvalue based sensing technique in the presence of correlated noise in the context of a Cognitive Radio (CR). We use a Standard Condition Number (SCN) based decision statistic based on asymptotic Random Matrix Theory (RMT) for decision process. Firstly, the effect of noise correlation on eigenvalue based Spectrum Sensing (SS) is studied analytically under both the noise only and the signal plus noise hypotheses. Secondly, new bounds for the SCN are proposed for achieving improved sensing in correlated noise scenarios. Thirdly, the performance of Fractional Sampling (FS) based SS is studied and a method for determining the operating point for the FS rate in terms of sensing performance and complexity is suggested. Finally, a Signal to Noise Ratio (SNR) estimation technique based on the maximum eigenvalue of the received signal's covariance matrix is proposed. It is shown that proposed SCN-based threshold improves sensing performance in correlated noise scenarios and SNRs up to 0 dB can be reliably estimated with less than 1 % normalized Mean Square Error (MSE) in the presence of correlated noise without the knowledge of noise variance.

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Linear MMSE Frequency Domain Equalization with Colored Noise

Cited by 7 publications

References 11 publications

A frequency domain equalizer for amplify-and-forward underwater acoustic relay communication systems

A frequency domain equalizer for amplify-and-forward underwater acoustic relay communication systems

Enhanced frequency-domain fractionally spaced equalization for coherent optical transmission system with colored noise

Eigenvalue-Based Sensing and SNR Estimation for Cognitive Radio in Presence of Noise Correlation

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