کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4957071 | 1444927 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A software reconfigurable optical multiband UWB system utilizing a bit-loading combined with adaptive LDPC code rate scheme
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی کامپیوتر
شبکه های کامپیوتری و ارتباطات
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this paper, an effective bit-loading combined with adaptive LDPC code rate algorithm is proposed and investigated in software reconfigurable multiband UWB over fiber system. To compensate the power fading and chromatic dispersion for the high frequency of multiband OFDM UWB signal transmission over standard single mode fiber (SSMF), a Mach-Zehnder modulator (MZM) with negative chirp parameter is utilized. In addition, the negative power penalty of â1Â dB for 128Â QAM multiband OFDM UWB signal are measured at the hard-decision forward error correction (HD-FEC) limitation of 3.8Â ÃÂ 10â3 after 50Â km SSMF transmission. The experimental results show that, compared to the fixed coding scheme with the code rate of 75%, the signal-to-noise (SNR) is improved by 2.79Â dB for 128Â QAM multiband OFDM UWB system after 100Â km SSMF transmission using ALCR algorithm. Moreover, by employing bit-loading combined with ALCR algorithm, the bit error rate (BER) performance of system can be further promoted effectively. The simulation results present that, at the HD-FEC limitation, the value of Q factor is improved by 3.93Â dB at the SNR of 19.5Â dB over 100Â km SSMF transmission, compared to the fixed modulation with uncoded scheme at the same spectrum efficiency (SE).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Fiber Technology - Volume 36, July 2017, Pages 387-393
Journal: Optical Fiber Technology - Volume 36, July 2017, Pages 387-393
نویسندگان
Jing He, Min Dai, Qinghui Chen, Rui Deng, Changqing Xiang, Lin Chen,