Intersymbol interference due to linear and nonlinear distortion

Metzger, Kurt; Valentin, R.

doi:10.1109/26.508300

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…Combining all these arguments the following conclusion can be made: Using this approach, the nonlinear distortion is analyzed at baseband by treating the inphase and quadrature channels separately. Several previous works including [46] and [58] have used the same approach. This approach is appropriately modified here to suit the (passband) communication environment.…”

Section: Baseband/passband Issuementioning

confidence: 99%

Signal processing for optical fiber based wireless access

Fernando

Armitage²

2017

Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging

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In this dissertation, signal-processing strategies are investigated for the performance improvement of optical fiber based wireless access schemes. Proposed solutions keep the remote radio access point(RAP) less complex and, do not modify the portable unit keeping the overall system cost low. Furthermore, these deliberations provide asymmetry in complexity and, make seamless roaming between the fiber based wireless systems and conventional wireless systems possible. The scope is limited to single mode radio over fiber (ROF) links and indoor micro/pico cells. Radio frequency is taken as 1.8 GHz and the maximum fiber length is few kilometers. First part of the dissertation is focused on characterization of the ROF link. This is done by both theoretical and empirical studies. Major limitation of the ROF link is found to be its nonlinearity. This comes from both electrical to optical (E/O) conversion process and amplification. Then, adaptive nonlinearity compensation schemes are investigated assuming an AWGN wireless channel. Predistortion is done for the downlink and postcompensation is done for the uplink. Both phase and amplitude nonlinearities are handled individually. Simulations based on measured data show adequate compensation is achieved, sometimes with a back off. Next, the BER performance is analyzed in a CDMA environment, assuming an AWGN wireless channel. An expression is derived for the SNR, which shows the 3 Empirical Characterization 44 3.1 Basic Nonlinearity Measurements 45 3.1.1 Effects of Fiber Dispersion 45 3.

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Section: Baseband/passband Issuementioning

confidence: 99%

Signal processing for optical fiber based wireless access

Fernando

Armitage²

2017

Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging

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“…In the work of [18], the linear distortions are modeled as a third-order Butterworth filter and limited to binary frequency-shift keying modulation and rectangular pulse shaping. Moreover, the later work of [19] focuses on the error probability related to linear and nonlinear distortions using the square-root raised-cosine filter (SRRCF) as pulse shaping, but it is restricted to quadrature amplitude modulation. Consequently, scant attention has been paid to meet the characteristics of the satellite standards of today [20]- [22], i.e., based at the same time on a wide range of linear modulation techniques, SRRCF pulse shaping, and imperfect filter distortion characteristics.…”

Section: Introductionmentioning

confidence: 99%

Filter Distortions in Ultra High-Throughput Satellites: Models, Parameters and Multicarrier Optimization

Colin

Delamotte

Knopp

2022

IEEE Trans. Signal Process.

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Ultra high-throughput satellite systems are expected to play an essential role in future beyond 5G and 6G networks. These systems must remain as flexible as possible to adapt to heterogeneous traffic demands, while also delivering the highest possible rate for dedicated services. Satellites flexible payloads are increasingly employing wideband output multiplexers. In this context, it is now more important than ever to evaluate frequencydependent degradations on multicarrier signals. In particular, it is critical to characterize the distortions entailed by the output multiplexers filters. In this paper, models are presented and novel formulas are derived to determine the carrier-to-interference ratio resulting from these distortions. Derivations are oriented towards the applicability of either high-accuracy (e.g., for link budget) or low-complexity calculations (e.g., for real-time carrier allocation). The influence of key parameters such as the optimal decision instant, symbol rate and roll-off factor is thoroughly analyzed. Furthermore, formulas are evaluated in a practical scenario: the dynamic carrier allocation optimization. They are combined with efficient optimization algorithms to obtain the best performance based on user fairness. Relevant metrics such as accuracy, complexity and allocation gain are also investigated. In the end, the application of the proposed formulas and algorithms leads to a significant allocation gain that is increasing with the number of carriers. The feasibility of real-time dynamic carrier allocation to further increase the capacity of the next generation of satellite systems is emphasized.

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“…An alternative method to compensate for nonlinear distortion introduced by the HPA in digital transmission systems was proposed by Metzger and Valetin [7]. This scheme is based on the determination of the Probability Density Function of InterSymbol Interference (PDF-ISI), which is caused by the compound effect of linear channel dispersion and nonlinear distortion.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Predistortion and Postdistortion for Nonlinear Channel

Rodríguez

Soto

Carrasco

1999

NCA

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This paper proposes a new adaptive predistortionpostdistortion scheme based on a recurrent neural network to reduce nonlinear distortion introduced by a high power amplifier in the amplitude and phase of received Quadrature Phase Shift Keying (QPSK) signals in a digital microwave system. The recurrent neural network structure is inspired by the model proposed by Williams and Zipser, with a modified backpropagation algorithm. The input signal is processed by a nonlinear predistorter which reduces the warping effect. The received output signal is passed through a postdistorter to compensate for the warping and clustering effects produced by an amplifier. The proposed scheme yields a significant improvement when it is compared to the system without predistortion-postdistortion, performance is evaluated in terms of the bit error rate and output signal constellation.

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Intersymbol interference due to linear and nonlinear distortion

Cited by 11 publications

References 11 publications

Signal processing for optical fiber based wireless access

Signal processing for optical fiber based wireless access

Filter Distortions in Ultra High-Throughput Satellites: Models, Parameters and Multicarrier Optimization

Adaptive Predistortion and Postdistortion for Nonlinear Channel

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