In this work, we analyzed the effects of partial response coding (balance duobinary and dicode coding) in the presence of nonlinear effects. By simulation, we find that the balance duobinary coding is more affected by...
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ISBN:
(纸本)9781467368988
In this work, we analyzed the effects of partial response coding (balance duobinary and dicode coding) in the presence of nonlinear effects. By simulation, we find that the balance duobinary coding is more affected by stimulus Raman scattering (SRS) by an amount of 0.5 dB as compare to dicode coding. So, dicode coding comparatively more tolerance to Raman cross talk in the video Overlay Passive Optical Network (PON). Further in this system 8.3 dB amplification is done by using Raman pump for the data signal to compensate the SRS effect and fiber loss for improving the performance of PON Network.
作者：
Ke, JunchiGao, MingyiChen, BowenShao, WeidongSoochow Univ
Jiangsu Engn Res Ctr Novel Opt Fiber Technol & Com Sch Elect & Informat Engn Suzhou Key Lab Adv Opt Commun Network Technol 1 Shizi St Suzhou 215006 Jiangsu Peoples R China
Intensity-modulation direct-detection (IM/DD) pulse-amplitude modulation (PAM-4) signals are promising for high-speed data center networks. However, high-speed PAM-4 signals always are subject to critical impairments ...
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Intensity-modulation direct-detection (IM/DD) pulse-amplitude modulation (PAM-4) signals are promising for high-speed data center networks. However, high-speed PAM-4 signals always are subject to critical impairments due to the bandwidth constraint. In the conventional PAM-4 system, a direct detection-faster than Nyquist (DD-FTN) with high complexity is usually appended to the feed-forward equalizer (FFE) for colored noise suppression to maximize transmission performance. In order to yield a simple PAM-4 scheme with similar performance as that of the DD-FTN, we proposed a nonlinear differential coding-generalized Tomlinson-Harashima Precoding (NLDC-GTHP) PAM-4 system. The proposed system consists of a NLDC-GTHP at the transmitter and a simplified two-dimensional constellation distortion (S2DCD) module at the receiver. We experimentally demonstrated the proposed NLDC-GTHP PAM-4 system for 62.5-Gb/s PAM-4 signal transmission over 2-km standard single mode fiber (SSMF) with the 10-dB bandwidth of about 12 GHz. By introducing the NLDC-GTHP and S2DCD, we achieved the similar receiver sensitivity as that of the DD-FTN at the hard-decision forward-error-correction (HD-FEC) bit error rate (BER) threshold, with the decrease of 86% computational complexity.
A new kind of encoding as well as a linear differential decoding method is proposed in this article.A new model built in the TWRC(two-way relay channels) is presented,which involves partial response coding at the sour...
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A new kind of encoding as well as a linear differential decoding method is proposed in this article.A new model built in the TWRC(two-way relay channels) is presented,which involves partial response coding at the source and two different kinds of differential coding(the add-differential coding and the multipledifferential coding) at the *** article puts forward the demonstration of the linear differential *** the decoding process,this new method can be used in both kinds of differential *** can be seen this method simplifies the decoding process and has its commonality.
Multiple-input multiple-output (MIMO) antennas combined with orthogonal frequency division multiplexing (OFDM) are very attractive for high data rate communications. However, MIMO-OFDM systems are very vulnerable to t...
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ISBN:
(纸本)9781424451234
Multiple-input multiple-output (MIMO) antennas combined with orthogonal frequency division multiplexing (OFDM) are very attractive for high data rate communications. However, MIMO-OFDM systems are very vulnerable to time selective fading as channel time variation destroys the orthogonality among subcarriers, causing serious intercarrier interference (ICI). In this paper, we employ optimal frequency domain partial response coding (PRC) in MIMO-OFDM systems over frequency selective, fast fading channels to mitigate ICI. We focus on deriving, via an analytical approach, a tractable, closed-form expression of carrier-to-interference ratio (CIR) to quantify the impact of time selective fading and demonstrate the effectiveness of PRC in mitigating ICI in MIMO-OFDM systems. From the numerical results, PRC can effectively increase CIR and the improvement is proportional to the number of subcarriers and the coding length.
Earlier work has derived the storage complexity of the bounded distance decoder (BDD) for binary-channel convolutional codes. We extend this work to the Gaussian noise channel and to partial-response codes. We show th...
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Earlier work has derived the storage complexity of the bounded distance decoder (BDD) for binary-channel convolutional codes. We extend this work to the Gaussian noise channel and to partial-response codes. We show that the storage requirement similar to(2(1-R) - 1)(-t) paths for rate-R convolutional codes over the binary channel becomes similar to2(2Rt) over the Gaussian channel, where the decoder must correct t errors. Thus, convolutional coding over the Gaussian channel is not only 3 dB more energy efficient, but its decoding is simpler as well. Next, we estimate the path storage for partial-response codes, i.e., real-number convolutional codes, over the Gaussian channel. The growth rate depends primarily on the bandwidth of the code. A new optimization procedure is devised to measure the maximum storage requirement in Gaussian noise for these two code types. An analysis based on difference equations predicts the asymptotic storage growth for partialresponse codes.
Controlled intersymbol interference may be used to design bandwidth efficient coded modulation schemes, The performance of the optimum receiver depends only on the free distance of the code and is independent of its p...
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Controlled intersymbol interference may be used to design bandwidth efficient coded modulation schemes, The performance of the optimum receiver depends only on the free distance of the code and is independent of its phase, Large reductions in receiver complexity are obtained by using reduced search detection techniques like the M-Algorithm (MA). However, we show that MA detector performance depends critically on phase, and is characterized by the partial energy of the encoder or channel, The minimum phase encoder needs by far the least detector searching, We propose modifications to the receiver, so that the reduced search ran operate on all nonminimum phase channels at this same low complexity.
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