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Showing papers on "High-bit-rate digital subscriber line published in 2014"


Proceedings ArticleDOI
01 Dec 2014
TL;DR: An analytical model of ICSI capturing differences in modulation between G.fast and VDSL2 results in significant bit-rate losses compared to an interference-free scenario for particular network topologies.
Abstract: G.fast is the next-generation digital subscriber line (DSL) technology targeting bit-rates of up to 1 Gbps. Very high speed digital subscriber line 2 (VDSL2) is the the latest DSL technology delivering bit-rates of up to 100 Mbps. Replacement of VDSL2 by G.fast modems will be gradual, which implies coexistence of these two systems. G.fast and VDSL2 use different symbol durations, carrier frequency spacings, and sampling rates, which results in inter-carrier and inter-symbol interference (ICSI). We derive an analytical model of ICSI capturing these differences in modulation. Furthermore, through simulations we show that for particular network topologies coexistence of the two systems results in significant bit-rate losses compared to an interference-free scenario.

8 citations


Patent
Jianping Tu1, Jie Lv1, Jinxiong Lv1
30 Apr 2014
TL;DR: In this paper, the authors proposed a method, an apparatus, and a system for reducing digital subscriber line interference, which includes identifying at least one legacy digital line in a DSL legacy line set.
Abstract: The present invention provides a method, an apparatus, and a system for reducing digital subscriber line interference. The method includes identifying at least one legacy digital subscriber line in a digital subscriber line DSL legacy line set, obtaining a target power spectral density mask value of the legacy digital subscriber line, and reducing power spectral density of a transmit signal on the legacy digital subscriber line according to the target power spectral density mask value.

6 citations


Proceedings ArticleDOI
01 Dec 2014
TL;DR: In this project single chip Orthogonal Frequency Division Multiplexing (OFDM) transmitter and receiver have been designed using Verilog HDL and simulation results show that each of the modules of the proposed OFDM is working as desired.
Abstract: System-on-a-chip (SoC) is now a trend in digital design because it gives a lot of advantages over discrete electronic based product such as higher speed, lower power consumption, smaller size, lower cost etc Reconfigurable platforms such as FPGA, CPLD, and PLD are now being used for designing and implementing SoC due to their low cost, high capacity and tremendous speed In this project single chip Orthogonal Frequency Division Multiplexing (OFDM) transmitter and receiver have been designed using Verilog HDL OFDM is a multi carrier modulation technique used in the various digital communication systems like 3G GSM, WiMAX and LTE etc The main advantage of this transmission technique is its robustness to channel fading in wireless communication environment There are many applications of OFDM in communication such as digital audio broadcasting, Asynchronous Digital Subscriber Line (ADSL) and High bit-rate Digital Subscriber Line (HDSL) systems In OFDM, two algorithms digital signal processing algorithm Fast Fourier transform (FFT) and Inverse Fast Fourier Transform (IFFT) are mainly involved The 8-point IFFT/FFT Decimation-In-Frequency (DIF) with radix-2 algorithm has been analyzed and incorporated in the design The design has been simulated on the FPGA platform with Altera's Quartus II simulator Simulation results show that each of the modules of the proposed OFDM is working as desired The test output achieved from the simulation result of the OFDM has been verified with that of the MATLAB output

2 citations


01 Jan 2014
TL;DR: In this paper, a new scheme for PAPR re-duction is proposed using Radix-2 Discrete in Frequence (DIF) Fast Fourier Transform (FFT).
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is used for wideband data communications over mobile radio FM channels, High-bit-rate Digital Sub scriber Lines (HDSL, 1.6Mbps), Asymmetric Digital Subscriber Lines (ADSL, up to 6Mbps), Very-high-speed Digital Subscriber Lines (VDSL, 100Mbps), Digital Audio Broadcasting (DAB), and High Definition Television (HDTV) terrestrial broadcasting. The OFDM system has a high peak-to-average power ratio (PAPR) that can cause unwanted saturation in the power amplifie rs. In order to avoid nonlinear distortion, highly linear amplif iers are required which cause a severe reduction in power efficiency. In this paper, a new scheme for PAPR re duction is proposed using Radix-2 Discrete in Frequ ency (DIF) Fast Fourier Transform (FFT). In proposed scheme we have used signal processing technique to reduce PA PR. The proposed scheme provides 3.3dB performance improvement in PAPR to than standard OFDM system as simulated in MATLAB.