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Smallcells have great potential to enhance cellular networks, complementing macrocells. Severe interference may occur, as smallcells are expected to be deployed and operated uncoordinatedly. However, existing resource management methods require significant overhead to suppress interference. We propose a new resource management approach which is able to mitigate the cross-tier and co-tier interference...
In this letter, a modified band-limited digital predistortion (DPD) technique is proposed to improve the performance of the conventional band-limited DPD method in wideband systems. The power amplifier’s (PA’s) spectral regrowth outside the passband of bandpass filter is unable to be compensated using the traditional band-limited DPD. To increase the overall linearized bandwidth and reduce the requirement...
We demonstrated the first transmission of 750-Mb/s 16QAM-OFDM signal over 1-km SMF-28 and 6-m air-link with 60-GHz ROF technology. The system improvement and low-power efficiency of RF transmitter are studied based on the convolutional code.
500Mb/s Quadrature Phase-Shift Keying (QPSK)-Orthogonal Frequency Division Multiplexing (OFDM) signals on 60-GHz mm-wave are experimentally demonstrated over 100-m graded-index polymer optical fiber with less than 1 dB power penalty at BER = 10-4.
A adaptive digital predistortion hybrid algorithm of LMS and RLS based on training sequence is proposed, which is applied to a digital pre-distortion system based on polynomial. It can estimation and update adaptive digital pre-distortion filter coefficients. First, This paper was given the configuration of all digital pre-distortion system. Second, adaptive digital predistortion method was realized...
A novel Look-Up-Table (LUT) predistortion power amplifier (PA) linearizer for OFDM systems is proposed in this paper. To improve conventional LUT linearizer, we employ Polynomial predistortion method to compensate the nonlinearity of PA through a filter. The provided method can speedup the algorithm convergence of LUT while reduce adjacent channel interference (ACI). In addition, hardware requirement...
A novel adaptive digital predistortion method combines RLS (Recursive Least-Square) and LMS (Least Mean-Square) with Volterra kernel is proposed to compensate the nonlinear and memorial distortion of OFDM power amplifier. For RLS could induce unexpected modulation mistakes in small error signal, it is chosen to estimate coefficients in big error signals to ensure the high convergent speed. As soon...
A novel adaptive digital pre-distortion algorithm with Volterra kernel is provided. According to the error threshold, corresponding convergent process is selected to compensate coefficients of OFDM power amplifier. When the error signal is big, adaptive algorithm with high speed convergence will be picked up. Otherwise,the pre-distorter coefficients updating base on a smooth convergent process which...
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