Sökning: "IDFT"

Hittade 4 uppsatser innehållade ordet IDFT.

  1. 1. Overcoming Inter-carrier-interference in OFDM System

    Magister-uppsats, Linköpings universitet/Kommunikationssystem

    Författare :Fukang Guo; Luoan Lu; [2021]
    Nyckelord :ICI; OFDM; TDCP; FDCE; Windowing-OFDM; 5G;

    Sammanfattning : This master thesis aims for Inter-carrier interference (ICI) mitigation in orthogonal frequency division multiplexing (OFDM) system by considering designs of frequency domain cyclic extension(FDCE) and optimal windowing pulse shape. Although OFDM system has been put forward in the 1970s, it has just emerged in 4G. LÄS MER

  3. 2. VHDL Implementation of Flexible Frequency-Band Reallocation (FFBR) Network

    Master-uppsats, Institutionen för systemteknik

    Författare :Abrar Hussain Shahid; [2011]
    Nyckelord :20-channel FFBR network; 20-point FFT IFFT; complex multiplier; polyphase components; radix-2; radix-5;

    Sammanfattning : In digital communication systems, satellites give us world wide services. These satellites should effectively use the available bounded frequency spectrum and, therefore, to carry out flexible frequency-band reallocation (FFBR), on-board signal processing implementation on FFBR network is needed. LÄS MER

  4. 3. An FPGA implementation of a modulator for digital terrestrial television according to the DTMB standard

    Uppsats för yrkesexamina på avancerad nivå, Institutionen för systemteknik

    Författare :Sebastian Abrahamsson; Markus Råbe; [2010]
    Nyckelord :DTMB; DTTB; DMB-T; FPGA; VHDL; OFDM; signal processing; ECC; IDFT; LDPC; BCH; convolutional; frequency interleaving; raised cosine; filter;

    Sammanfattning : The increasing data rates in digital television networks increase the demands on data capacity of the current transmission channels. Through new standards, the capacity of exisiting channels is increased with new methods of error correction coding and modulation. LÄS MER

  5. 4. Use SNA instead of VNA to characterize indoor channel : implementing and rms theory

    Kandidat-uppsats, Avdelningen för elektronik, matematik och naturvetenskap

    Författare :Jingou Lai; Che Liu; [2010]
    Nyckelord :network analyzer; rms delay; hilbert transform;

    Sammanfattning : In this report we focus on the use of an economical way on how Scalar Network Analyzer (SNA) works instead of Vector Network Analyzer (VNA) to estimate the phase angle of signals in indoor channel. This is detailed in RMS delay theory and simulation section, experimental is designed in the according Experiment Design section, where we also state the required measurements known from the math part. LÄS MER