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Power amplifier (PA) is indispensable in wireless communication systems and is nonlinear inherently. Many mathematical model and analytical approach has been used to analysis the nonlinear character of PA and to construct the model of predistorter. However, most of the models contain only odd order terms to analysis PA nonlinearity. Some researches show that only odd-order polynomial terms in the...
Power amplifiers (PAs) are important components in OFDM systems which can efficiently uses the spectrum but very sensitive to constellation error. The nonlinearity of PAs causes in-band distortion and spectral regrowth, thereby increasing the constellation error. To overcome the PA's nonlinearity, Digital predistortion is a highly cost-effective way to linearize PAs. When modeling of digital predistorter,...
High power amplifiers (HPA) are essential in orthogonal frequency division multiplexing (OFDM) wireless communication system, but efficient transmission and nonlinear are inversely proportional which difficultly to balance. It's important to improve the HPA linearity and not reduce the efficiency. The digital predistortion technique is suitable for improving linearity. In this paper, based on the...
High Peak-to-Average Power Ratio (PAPR) has been a crucial problem in orthogonal frequency division multiplexing (OFDM) systems. Suppress the PAPR of OFDM signals is expanded to minimize the complementary cumulative distribution function (CCDF) curve as the target, but the specific curve which decreases or which points to get the best results is difficult. At the same time, there is no uniform standard...
FM sound sync-broadcasting system can save frequencies resources, expand coverage, improve the audio quality. Technical specification for FM sound sync-broadcasting system (GY/T 154-2000) was published for implementation in December 2000. The most basic technical parameters in standards are the synchronous carrier frequency, the synchronous phase, the synchronous modulation depth and ensure that acceptance...
Bit-interleaved coded modulation with iterative decoding (BICM-ID) can achieve better performance than BICM in both AWGN and Rayleigh fading channels because of the feedback algorithm. However, some existing decoding schemes in BICM-ID cannot perform well in both computational complexity and decoding performance. The Max-Log-MAP algorithm has lower computational complexity with worse decoding performance...
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