Essays about: "quadrature amplitude modulation"

Showing result 1 - 5 of 13 essays containing the words quadrature amplitude modulation.

  1. 1. Circular Modulation Formats and Carrier Phase Estimation for Coherent Optical Systems

    University essay from KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Author : Sebastian Joel Ortega Zafra; [2014]
    Keywords : ;

    Abstract : Digital coherent receivers stand today as a promising technology for the next generation of high-capacity optical systems. Coherent systems enable the use of multilevel modulation formats which increase the spectral efficiency of a system. READ MORE

  3. 2. MIMO Channel Equalization and Symbol Detection using Multilayer Neural Network

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : Athar Waseem; A.H.M Sadath Hossain; [2013]
    Keywords : MIMO; ISI; NN; SER; Channel Equalizer; QAM;

    Abstract : In recent years Multiple Input Multiple Output (MIMO) systems have been employed in wireless communication systems to reach the goals of high data rate. A MIMO use multiple antennas at both transmitting and receiving ends. These antennas communicate with each other on the same frequency band and help in linearly increasing the channel capacity. READ MORE

  4. 3. PERFORMANCE ENHANCEMENT OF OFDM IN PAPR REDUCTION USING NEW COMPANDING TRANSFORM AND ADAPTIVE AC EXTENSION ALGORITHM FOR NEXT GENERATION NETWORKSPERFORMANCE ENHANCEMENT OF OFDM IN PAPR REDUCTION USING NEW COMPANDING TRANSFORM AND ADAPTIVE AC EXTENSION ALGORITHM FOR NEXT GENERATION NETWORKS

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : CLEMENT RANJITH ANTHIKKAD & IRFAN AHMED BAIG; [2013]
    Keywords : Orthogonal Frequency Division Multiplexing OFDM ; Peak-to-Average Power Ratio PAPR ; Complementary Cumulative Distribution Function CCDF ; Partial Transmit Sequence PTS ; Tone Reservation TR .;

    Abstract : This paper presents a new hybrid PAPR reduction technique for the OFDM signal, which combines a multiple symbol representations method with a signal clipping method. The clipping method is a nonlinear PAPR reduction scheme, where the amplitude of the signal is limited to a given threshold. READ MORE

  5. 4. Design, Implementation and Comparison of Demodulation Methods in AM and FM

    University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Author : Gaojun Chen; Sen Lin; [2012]
    Keywords : Demodulation; Envelope; Coherent; Square-law; FM to AM; Zero-crossing; Quadrature.;

    Abstract : Modulation and demodulation hold dominant positions in communication. Communication quality heavily relies on the performance of the detector. A simple and efficient detector can improve the communication quality and reduce the cost. READ MORE

  6. 5. QAM and PSK Modulation Schemes under Impulsive Noise

    University essay from Avdelningen för elektronik, matematik och naturvetenskap

    Author : Ezequiel Pérez Rodenas; [2012]
    Keywords : Impulsive noise; QAM; PSK; modulation; BER; APD;

    Abstract :    Nowadays most of the communications systems are designed considering only to work under AWGN (Additive White Gaussian Noise). But the implementation of wireless systems in industrial facilities brings different kind of interference from machines or any other kind of electronic devices. READ MORE