Sökning: "GMSK"

Visar resultat 1 - 5 av 9 uppsatser innehållade ordet GMSK.

  1. 1. Investigating new Service System Solutions for High Altitude Balloons : Feasibility Study and Design Challenges

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Joakim Peterson; [2016]
    Nyckelord :High altitude balloon; service system; corona discharge;

    Sammanfattning : The high altitude balloon operations at Esrange Space Center have been goingon since 1972, and about 550 launches have been performed. Their present service system for the high altitude balloons is about 18 years old. To be able to meet the requests from their customers, SSC have started the development of a new service system. LÄS MER

  3. 2. Performance of MLSE over Fading Channels

    Master-uppsats, Institutionen för fysik och elektroteknik (IFE)

    Författare :Aftab Ahmad; [2013]
    Nyckelord :;

    Sammanfattning : This work examines the performance of a wireless transceiver system. The environment is indoor channelsimulated by Rayleigh and Rician fading channels. The modulation scheme implemented is GMSK inthe transmitter. In the receiver the Viterbi MLSE is implemented to cancel noise and interference dueto the ltering and the channel. LÄS MER

  4. 3. Strömsnål FM-demodulering med FPGA

    Kandidat-uppsats, Elektroniksystem

    Författare :Gustaf Lindström; [2011]
    Nyckelord :FM; FPGA; DARC; GMSK; CORDIC;

    Sammanfattning : Rutiner skrivna i Verilog har utvecklats för avkodning av en frekvensmodulerad signal givet ett Analog Devices AD9874-chip. Olika metoder för I/Q-demodulation har utvärderats och av dessa har CORDIC valts och implementerats i Verilog. Koden har till viss del testats på en IGLOO nano-FPGA men framförallt simulerats och verifierats i ModelSim. . LÄS MER

  5. 4. Spectrum Optimization in Cognitive Radio Networks using Genetic Algorithms

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :Adnan Azam; Taimoor Siddique; [2010]
    Nyckelord :EM; FCC; CR; QoS; GA; SDR; EC; GP; DSP; FPGA; BER; RF; FM; BPSK; QPSK; GMSK; 16 QAM; DPSK; MSK; OFDM; OOK; GW; FP; ABS; AWS;

    Sammanfattning : The rapid revolution in wireless communication in past years has increased the demand of radio spectrum to fulfill quality of service (QoS) requirements of wireless applications, leading to spectrum overcrowding. To solve the spectrum overcrowding problem, cognitive radio (CR) has emerged as a leading technology because it can intelligently sense an unused spectrum without creating any harm to authorized users. LÄS MER

  7. 5. Algorithms for analysis of GSM phones’ modulation quality

    Uppsats för yrkesexamina på avancerad nivå, Institutionen för systemteknik

    Författare :Tobias Carlstedt; [2009]
    Nyckelord :GMSK; algorithms; frequency error; phase error; output power;

    Sammanfattning : Instruments for analyzing radio signals are very expensive and their full capacity is seldom used outside the research and development and the type approval departments. Instrument manufacturers have historically integrated the hardware and the software into a single unit. But some instrument manufacturers are beginning to change this. LÄS MER