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We propose a novel digital on-channel repeater (DOCR) for T-DMB system where DOCR is equipped with multiple receive antennas. Prior works have focused on the DOCR with a single antenna so that the equalized DOCR (E-DOCR) combined with time-domain zero-forcing equalizer and feedback interference canceller is the latest structure. In this paper, the new paradigm structure is proposed by introducing...
In this paper, we propose a linearization technique combined with an iterative noise cancelation. This method alleviate the effect of added noises which prevent a predistorter (PD) from estimating the exact characteristics of power amplifier (PA). To iteratively cancel the noise included in the feedback signal, the output signal of power amplifier without noise is reconstructed by applying the inverse...
A signal space diversity (SSD) scheme combined with Alamouti coding is investigated to achieve more diversity gain in fading channels. By approximating noise as a Gaussian distribution after Alamouti decoding, an exact expression for the SER for SSD schemes with Alamouti coding in Rayleigh fading channels can be derived for 4-QAM and 16-QAM. Using the formula derived by using upper bound approach,...
It is well known that high power amplifier (HPA) induces nonlinear distortion around its saturation region. It causes the inter-modulation distortion (IMD) and spectrum re-growth problems. Thus, the digital pre-distortion (DPD) technique is used to improve the linearity of HPA. This paper proposes the adaptive DPD technique, which is composed of a look-up table (LUT) based adaptive update algorithm,...
This paper investigates the reason why the predistorted signal is sampled and feeds back to an adaptation block as reference for digital predistorter (DPD) to be updated in real-time (RT) by comparing a non-real-time (NRT) method with off-time processing. In addition, by deriving a simple algorithm based on gradient descent algorithm with minimum square error criterion, the steady-state condition...
A signal space diversity (SSD) scheme combined with receive maximal ratio combining (MRC) was investigated in order to achieve more diversity gain in fading channels. By approximating noise as a Gaussian distribution after performing receive MRC, an exact expression for the symbol error rate for SSD schemes combined with receive MRC in Rayleigh fading channels can be derived for 4-QAM and 16-QAM....
To analyze numerous field test data of digital broadcasting systems efficiently, field measurement systems have been integrated and become more intelligent. In this paper, we present the Integrated Measurement and Analysis System (IMAS) which manages DTV and TDMB (Terrestrial Digital Multimedia Broadcasting) test data very efficiently. This system can measure various parameters of DTV, T-DMB as well...
To manage numerous field test data of digital broadcasting systems efficiently, field measurement systems have been integrated and become more intelligent. In this paper, we present the Integrated Measurement and Analysis System (IMAS) which manages DTV and T-DMB (Terrestrial Digital Multimedia Broadcasting) test data very efficiently. This system can measure various parameters of DTV, T-DMB as well...
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