Sökning: "Frequency Selective Channels"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden Frequency Selective Channels.

1. 1. Practical Aspects of Reduced Complexity LDPC Decoding using Forced Convergence

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Muhammad Umar Farooq; Maria Garcia Garcia; [2016]
   Nyckelord :LDPC; Forced Convergence; Decoding; OFDM; IEEE802.11; Technology and Engineering;

   Sammanfattning : This thesis is an extension to the previous work done at Department of EIT in investigating the complexity reduction of LDPC decoding using the stochastic approximation method to improve the energy efficiency of energy-limited applica- tions, such as in mobile phones. The research carried out in this thesis investigates the complexity and conver- gence results of adaptive performance control algorithm (PCAA) that changes the forced convergence threshold in OMS LDPC FC decoding algorithm. LÄS MER

3. 2. Performance Evaluation of 802.15.4 UWB PHY for High Speed Data Rate under IEEE Channel Mode

   Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

   Författare :Athanasios Vasileiadis; [2015]
   Nyckelord :Technology and Engineering;

   Sammanfattning : In modern day society the increase of data generation and transfer has been an issue that researchers are working on. This generated and shared data might have a different purpose but one thing is certain, the reception. This communication can cover continents, countries, cities or even just a few meters. LÄS MER

4. 3. Complexity Efficient Decoder Design for Vehicular Communication

   Master-uppsats, KTH/Kommunikationsteori; KTH/ACCESS Linnaeus Centre

   Författare :Gwilherm Baudic; [2013]
   Nyckelord :;

   Sammanfattning : Vehicular communication is currently seen as a key technology for enabling safer and more comfortable driving. In the general effort to reduce the number of casualties and improve the traffic flow despite an increasing number of vehicles, this field has a promising future. IEEE 802. LÄS MER

5. 4. 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

   Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

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

   Sammanfattning : 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. LÄS MER

7. 5. SNR Estimation for Preamble-based Wireless OFDM Systems using Extended Kalman Filter

   Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

   Författare :Shravan Kumar Parsi; Sridhar Basa; [2011]
   Nyckelord :Extended Kalman Filter; Fading channels; Least squares; OFDM; SNR;

   Sammanfattning : In Orthogonal Frequency Division Multiplexing (OFDM) systems, robustness in frequency selective channels is achieved using adaptable transmission parameters. To reckon these parameters, knowledge of Signal to Noise Ratio (SNR) estimates obtained by channel state information is essential. LÄS MER