Martin Pospisil’s research while affiliated with Brno University of Technology and other places

... Окрім використання SDR саме в телекомунікаційних системах пропонуються різні прикладні застосування в рамках виконання інших задач, зокрема емуляція завад у системах контролю доступу на основі радіочастотної ідентифікації [3], спектральний аналіз у форматі веб-додатка [4]. ...

Reference:

Software Processing of Signals with Amplitude Modulation of Many Components

... There is comparatively little research on real-time FPGA hardware implementations of OTFS waveforms. [15], [16] have performed the Software-defined radio (SDR) implementation of an OTFS modem. [15] studied the performance of OTFS and OFDM modulation systems in real indoor wireless channel scenarios. ...

Reference:

FPGA Implementation of OTFS Modulation for 6G Communication Systems

... In a flexible duplex, eliminating UL and DL interference within a carrier is a crucial technical challenge because the non-ideal PA causes severe out-of-band leakage. The primary solutions to these issues include enhanced filters [124] and adjacent channel interference cancelation [125,126]. The former provides better out-of-band isolation, whereas the latter reconstructs or extracts the out-of-band emissions and then subtracts them from the received signals. ...

Reference:

A new 5G radio evolution towards 5G-Advanced

... Thus, as summarized in Table 1, the presented test-bed achieves a much higher transmission power, with a bandwidth and linearity performance comparable to or exceeding the state-of-the art works in [38] or [16]. In addition to our recently published conference contribution [39] or our recent paper showing early predistortion results [40], this manuscript presents a much more detailed description of the hardware as well as the compensation algorithms and also provides in-depth results of the digital predistortion application for three examples of typical communication waveforms-MQAM, OFDM and FBMC-and two cases of power amplifiers. ...

Reference:

Digitally-Compensated Wideband 60 GHz Test-Bed for Power Amplifier Predistortion Experiments

... In recent years, a rapid evolution in wireless applications increase the development a new prototype compact planar reader antenna design with optimization dimensions to support a wireless radio technology such as radio frequency identification data (RFID) reader applications [1]- [3]. This is because the frequency bands super high frequency (SHF) and ultra-high frequency (UHF) can supply broad readable ranges and important data transfer rate [4]- [6]. Despite of the reality that this application very important in the world and diverse community have a different administrative standard for RFID frameworks. ...

Reference:

A new compact grounded coplanar waveguide slotted multiband planar antenna for radio frequency identification data applications

... On the other hand, the direct conversion architecture [23] suffers from the modulator/demodulator phase and gain imbalances. The spectral images arising due to these impairments result in a significant reduction of the achievable rate, as has been shown in [24] and as we further developed experimentally for the case of the 60 GHz transceiver [25]. ...

Reference:

Digitally-Compensated Wideband 60 GHz Test-Bed for Power Amplifier Predistortion Experiments

... The collaboration included exchange of ideas for channel sounder construction, joint planning of measurement campaigns (to have some comparable measurements in different cities, and otherwise avoid excessive overlap between the measured scenarios), as well as joint evaluation and interpretation of the measurements. Results from these campaigns were presented in a series of research papers [2]- [14]. The aim of the current paper is to systematically present and compare the channel sounders, measurement scenarios, and results of those campaigns. ...

Reference:

Millimeter-Wave V2X Channel Measurements in Urban Environments

... This inevitably adds residual transceiver hardware impairments (RTHIs) from the phase noise [19], [20], amplifier non-linearity [21], and in-phase/quadrature-phase imbalance [22], [23] to the received signal. The RF front-end imperfections have a more negative impact on the mmWave spectrum range than in the conventional frequency range [24] due to an inverse relationship between the transmission rate and RTHI level [25]. ...

Reference:

Performance of NOMA-based mmWave D2D Networks under Practical System Conditions

... Therefore, they fail to warrant longer connectivity time. To warrant better useful policies within a short training time, studies in [15,17,18,20,21,22] incorporate RL with JMLS and GT techniques. In [21] the particle-filter-based RL is incorporated to predict a finite number of disturbances and states within a randomly chosen sample of trajectories. ...

Reference:

Pattern Based Mobility Management in 5G Networks With a Game Theoretic-Jump Markov Linear System Approach

... Under this assumption, β and ψ in (12) remain constant when consistently using the same receiver SDR, and hence only the relative impairments from the transmitter (with respect to the receiver) are considered. As IQ imbalance is found to be sensitive against chip heating [38], the ambient temperature of the test environment is monitored to avoid the potential noise introduced due to varying temperatures. ...

Reference:

Deep Learning Methods for Device Identification Using Symbols Trace Plot