期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到4篇文章
< 1 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
THE STUDY OF AN M-ARY MC-CDMA SYSTEM BASED ON CYCLIC SPREADING CODES & PRE-EQUALIZATION 认领 引用
1
作者 ChuZhenyong YingXiaofan +1 位作者 YiKechu TianHongxin 《Journal of Electronics(China)》 2005年第3期273-280,共8页
A novel fast despreading scheme for M-ary Multi-Carrier Code-Division Multiple Access (MC-CDMA) system is proposed based on cyclic spreading codes and pre-equalizer. In the transmitter, the M spreading codes of each u... A novel fast despreading scheme for M-ary Multi-Carrier Code-Division Multiple Access (MC-CDMA) system is proposed based on cyclic spreading codes and pre-equalizer. In the transmitter, the M spreading codes of each user are generated by circularly shifting the prototype spreading code. A feedback pre-equalizer is employed to process the M-ary MC- CDMA signal before transmitted. The received signal is multiplied by the Inverse Discrete Fourier Transform (IDFT) result of the mirror image code of the prototype spreading code, and then demodulated by Orthogonal Frequency-Division Multiplexing (OFDM) demodulator. Compared with the conventional M-ary MC-CDMA receiver, the proposed scheme increases bandwidth efficiency, meanwhile, it achieves M-ary despread spectrum and multi-carrier demodulation, which reduces computation complexity remarkably. 展开更多
关键词 Multi-Carrier Code-Division Multiple Access (MC-CDMA) M-ary spread spec- trum Cyclic spreading codes Pre-equalization Computation complexity
暂未订购 下载PDF
Novel pre-equalization transimpedance amplifier for 10 Gb/s optical interconnects 认领 引用 被引量：1
2
作者 宋奇伟 毛陆虹 +1 位作者 谢生 康玉琢 《Journal of Semiconductors》 EI CAS CSCD 2015年第7期114-118,共5页
This paper presents a modified regulated cascode （RGC） transimpedance amplifier （TIA） with a novel pre-equalized technique. The pre-equalized circuit employed the broadband series inductive Jr-network and Gin- boo... This paper presents a modified regulated cascode （RGC） transimpedance amplifier （TIA） with a novel pre-equalized technique. The pre-equalized circuit employed the broadband series inductive Jr-network and Gin- boosting technique. The introduction of this technique compensates the transferred signal at the input port of the TIA without an increase in power dissipation. Furthermore, a novel miller capacitance degeneration method is designed in the gain stage for further bandwidth improvement. The TIA is realized in UMC 0.18 μm CMOS technology and tested with an on-chip 0.3 pF capacitor to emulate a photodetector （PD）. The measured transimpedance gain amounts to 57 dBf2 with a -3 dB bandwidth of about 8.2 GHz and consumes only 22 mW power from a single 1.8 V supply. 展开更多
关键词 pre-equalized Gm-boosting series inductive re-network miller capacitance degeneration
暂未订购 下载PDF
Frequency comb pre-equalizer enabling 110-GBaud coherent DCI transmission by a 35-GHz-class bandwidth-limited transceiver 认领 引用
3
作者 Li Zhao Hao Wu +7 位作者 Jianyu Long Wei Xun Miao Liu Shuidong Chen Jun Sun Yaowei Shi Haitao Zhao Jianjun Yu 《Chinese Optics Letters》 SCIE EI CAS CSCD 2026年第5期45-49,共5页
The exponential growth of artificial intelligence(AI)and cloud services has driven unprecedented demand for high-capacity data center interconnects(DCIs),pushing the need for spectrally efficient transmission solution... The exponential growth of artificial intelligence(AI)and cloud services has driven unprecedented demand for high-capacity data center interconnects(DCIs),pushing the need for spectrally efficient transmission solutions.In this Letter,we propose and demonstrate,to our knowledge,a novel dual-side frequency comb pre-equalization(DS-FC-Pre-Eq)technique that enables110-GBaud PS-64-QAM transmission using bandwidth-limited 35-GHz-class coherent transceivers.The proposed method employs a frequency comb with randomized tone spacing and phase to simultaneously estimate and compensate for asymmetric magnitude and phase responses while maintaining the minimal peak-to-average power ratio(PAPR).Experimental results show that our optimized DS-FC-Pre-Eq scheme with 20-dB magnitude clipping achieves reliable 1.1-Tbps/channel transmission over a 20-km standard single-mode fiber(SSMF),representing a significant improvement over non-equalized systems.This work provides a cost-effective solution for next-generation DCI systems requiring high capacity under stringent bandwidth constraints. 展开更多
关键词 data center interconnect dual-side frequency comb pre-equalization PS-64-QAM
暂未订购 下载PDF
100 Gbit/s Nyquist-WDM PDM 16-QAM Transmission over 1200 km SMF-28 with Ultrahigh Spectrum Efficiency 认领 引用
4
作者 Ze Dong 《ZTE Communications》 2012年第3期22-27,共6页
Nyquist wavelength-division multiplexing （N-WDM） allows high spectral efficiency （SE） in long-haul transmission systems. Compared to polarization-division multiplexing quadrature phase-shift keying （PDM-QPSK）, m... Nyquist wavelength-division multiplexing （N-WDM） allows high spectral efficiency （SE） in long-haul transmission systems. Compared to polarization-division multiplexing quadrature phase-shift keying （PDM-QPSK）, multilevel modulation, such as PDM 16 quadrature-amplitude modulation （16-QAM）, is much more sensitive to intrachannel noise and interchannel linear crosstalk caused by N-WDM. We experimentally generate and transmit a 6 x 128 Gbit/s N-WDM PDM 16-QAM signal over 1200 km single-mode fiber （SMF）-28 with amplification provided by an erbium-doped fiber amplifier （EDFA） only. The net SE is 7.47 bit/s/Hz, which to the best of our knowledge is the highest SE for a signal with a bit rate beyond 100 Gbit/s using the PDM 16-QAM. Such SE was achieved by DSP pre-equalization of transmitter-side impairments and DSP post-equalization of channel and receiver-side impairments. Nyquist-band can be used in pre-equalization to enhance the tolerance of PDM 16-QAM to aggressive spectral shaping. The bit-error ratio （BER） for each of the 6 channels is smaller than the forward error correction （FEC） limit of 3.8 × 10-3 after 1200 km SMF-28 transmission. 展开更多
关键词 16-QAM coherent detection Nyquist wavelength-division multiplexing Nyquist-band pre-equalization spectral efficiency signaltransmission
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈