A compact dual-band inverted microstrip ridge gap waveguide (IMRGW) diplexer composed of four dual-mode IMRGW resonators and an IMRGW T-junction matching network is proposed in this letter. The dual-band diplexer is based on a dual-mode IMRGW resonator which can produce both the inverted microstrip resonant mode and the cavity resonant mode. Two resonant modes of the IMRGW resonator are highly independent, so the passbands of dual-band IMRGW diplexer can be easily tuned to the desired frequencies. A second-order dual-band IMRGW diplexer is designed and simulated. The simulated passbands of the second-order dual-band IMRGW diplexer are 13.

Abstract-For the weakness of the existing predistortion algorithm, when large amplitude component in the modulation signal which is more than the voltage in saturation will be limited, leading to predistortion algorithm become invalid, and a new joint RF power amplifier (PA) linearization method is proposed. The method in this paper combines Peak-to-average Power Ratio (PAPR) reduction method base on u-law with predistortion algorithm, first compressing the signal amplitude by using PAPR reduction method, then linearizing the modulation signal by using predistortion algorithm, two boxes supplemented to each other, solving the weakness of the existing predistortion algorithm. The simulation result shows that the proposed method can effectively improve the power spectrum of the signal with about 5 dB out-of-band distortion compensation, effectively improve the Bit-Error-Ratio (BER) performance of system, and reduce the gap to the original signal less than 2 dB when the BER performance is 10 -5 in nonlinear AWGN channel.

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The turbulence in the channel will increase the bit error rate of the FSO system, which can resist the influence of atmospheric turbulence in many ways. In this paper, spatial pulse position modulation (SPPM) is combined with Polar code to improve error performance. The influence of list length on the decoding performance of CRC-SCL and the performance changes of Polar codes at different code lengths and rates are analyzed. Monte Carlo simulation results show that Polar codes in SPPM system have similar performance changes as in single input single output system. Therefore, Higher coding gain at low code rate and long code length.

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