Sökning: "Mikko Valkama"

Hittade 2 avhandlingar innehållade orden Mikko Valkama.

  1. 1. Characterization and Compensation of Hardware Impairments in Transmitters for Wireless Communications

    Författare :Zain Ahmed Khan; Peter Händel; Magnus Isaksson; Mikko Valkama; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power amplifier; RF transmitters; SISO; MIMO; crosstalk; Volterra series; Volterra kernels; behavioral modeling; DPD; Ramanujan sums; multitone signals; I Q Imbalance; non-linearity; memory polynomial; density estimation; hardware impairments; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Increasing demands for data rate, energy efficiency and reliability in wireless communications have resulted in the introduction of radio frequency (RF) multiple input multiple output (MIMO) transmitters. However, MIMO transmitters suffer from additional crosstalk impairments along with the power amplifier (PA) and I/Q imbalance distortions observed in single input single output (SISO) transmitters. LÄS MER

  3. 2. On Parameter Estimation Employing Sinewave Fit andPhase Noise Compensation in OFDM Systems

    Författare :Senay Negusse; Peter Händel Professor; Per PhD Zetterberg Docent; Mikko Valkama; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Parameter Estimation; Maximum-likelihood; OFDM; Phase-Noise; Wireless Channel; Informations- och kommunikationsteknik; Information and Communication Technology;

    Sammanfattning : In today’s modern society, we are surrounded by a multitude of digital devices.The number of available digital devices is set to grow even more. As the trendcontinues, product life-cycle is a major issue in mass production of these devices. LÄS MER