Turbo frequency domain equalization for single-carrier broadband wireless systems

Ng, B.K.; Lam, Chan‐Tong; Falconer, D.D.

doi:10.1109/twc.2007.05439

Cited by 97 publications

(56 citation statements)

References 11 publications

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“…The approximation of interference as scalar Gaussian in (13) greatly simplifies the computation of messages. Note that there is no need for covariance matrix inversion in this approach.…”

Section: Scalar Approximationmentioning

confidence: 99%

“…Frequency domain (FD) linear equalization including minimum mean square error (MMSE) equalization [6], [8], and decision feedback equalization [10], [11] for single carrier MIMO systems are known. The use of FD equalizers in turbo equalization was investigated in [12], [13]. Though linear equalizers can scale well for large K and L, their performance is far from optimal.…”

Section: Introductionmentioning

confidence: 99%

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Frequency Domain Turbo Equalization for MIMO-CPSC Systems with Large Delay Spreads

Itankar

Chockalingam

2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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Abstract-In this paper, we consider low-complexity turbo equalization for multiple-input multiple-output (MIMO) cyclic prefixed single carrier (CPSC) systems in MIMO inter-symbol interference (ISI) channels characterized by large delay spreads. A low-complexity graph based equalization is carried out in the frequency domain. Because of the reduction in correlation among the noise samples that happens for large frame sizes and delay spreads in frequency domain processing, improved performance compared to time domain processing is shown to be achieved. This improved performance is attractive for equalization in severely delay spread ISI channels like ultrawideband channels and underwater acoustic channels.

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“…The approximation of interference as scalar Gaussian in (13) greatly simplifies the computation of messages. Note that there is no need for covariance matrix inversion in this approach.…”

Section: Scalar Approximationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Frequency Domain Turbo Equalization for MIMO-CPSC Systems with Large Delay Spreads

Itankar

Chockalingam

2012

2012 IEEE 75th Vehicular Technology Conference (VTC Spring)

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“…Namely, steps 2 to 4 can be repeatedly carried out to further enhance the performance. The method used in [19] can be helpful to account for the improved reliability of signal detection after each phase of the proposed algorithm. However, such a method requires high computational complexity, and thus is not considered in this paper.…”

Section: B the Proposed Fde Algorithmmentioning

confidence: 99%

A frequency domain equalization algorithm for fast time-varying fading channels

2009

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Conventional frequency domain equalization (FDE) schemes were originally devised for quasi-static channels. Thus, such equalization schemes could suffer from significant performance degradation in fast-fading channels. This paper proposes a frequency domain equalization algorithm to mitigate the effect of fast time-varying fading. First, a mathematical expression is derived to quantify the total interference resulting from the time variation of the channel. Then, the proposed approach attempts to eliminate the effect of time-variations of the channel. This cancellation allows efficient use of the classical FDE structures in fast time-varying fading environments, although they are built upon the quasi-static channel model. Simulation results of bit-error-rate performance are provided to demonstrate the effectiveness of the proposed algorithm.Index Terms: Cancellation, direct sequence code division multiple access (DS-CDMA), fast time-varying fading channels, frequency domain equalization (FDE).

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“…As the trend towards spectrally efficient modulation and large signal bandwidth continues, distortions often become the main bottleneck in system performance. A multitude of techniques exist to combat various types of signal distortion including predistortion at the transmitter [1,2], equalization at the receiver [3], and modulation schemes such as OFDM [4] and errorcorrecting codes [5]. In this work, we focus on improved demapping in the presence of distortion.…”

Section: Introductionmentioning

confidence: 99%

Improved demapping for channels with data-dependent noise

Layton

Mehboob

Cowley

et al. 2018

J Wireless Com Network

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A new demapper is presented for communication channels that can be modeled with data-dependent noise on the received symbols. This includes optical and satellite channels with various types of distortion. The demapper incorporates the covariance information of the received symbol clusters to capture noise variation across the constellation and any dependency between the in-phase and quadrature components. Two communication scenarios are considered, and it is shown that the demapper is advantageous when a system is dominated by distortion as opposed to thermal noise. Channel coding considerations are presented, and reductions up to 4 dB in the required SNR are achieved.

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Turbo frequency domain equalization for single-carrier broadband wireless systems

Cited by 97 publications

References 11 publications

Frequency Domain Turbo Equalization for MIMO-CPSC Systems with Large Delay Spreads

Frequency Domain Turbo Equalization for MIMO-CPSC Systems with Large Delay Spreads

A frequency domain equalization algorithm for fast time-varying fading channels

Improved demapping for channels with data-dependent noise

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