Abstract
To remove the impacts of polarization interference on satellite-to-ground high-speed data transmission systems, the major factors that affect polarization interference are concluded, the deteriorations of bit error rate (BER) of different modulation systems and channel coding modes are simulated, and the parallel adaptive filtering technology is presented to resolve the high symbol-rate signal transmission polarization interference. It has been verified by experiments that the effects of this method is remarkable. In the situation of QPSK system, 500MSPS symbol rate and 10 dB polarization isolation, the BER performance can be improved 4.5 dB by using this method.
Highlights
In recent years, cognitive radio [1,2,3] and polarization multiplexing technology have become a research hotspot to improve the satellite remote sensing transmission system
Carrier polarity depends on the polarization characteristics of transmitting antenna feeder system, and the receiving antenna must have the same polarization with the transmitting antenna to implement polarization matching [8,9,10]
2 Method The principle of the polarization interference suppression with adaptive filtering is as follows: the mutual interference degree of symbols in different polarization channels is constant in a certain period of time, the coefficients can be adjusted using minimum mean square error extraction and polarity correlation methods, and the system convergence can reach a stable value; after all of the symbols and coefficients are weighted, the polarization interference suppression is accomplished
Summary
Cognitive radio [1,2,3] and polarization multiplexing technology have become a research hotspot to improve the satellite remote sensing transmission system. In combination with the characteristics of satellite data transmission, the major factors of inter-symbol interference include microwave channel group delay and amplitude unbalance, modem orthogonal unbalance, power amplifier nonlinearity, and so on, which mainly cause signal inter-symbol tailing interference and cross interference. It is required to adopt the pipeline structure in design of high-speed digital adaptive filtering circuit to solve time sequence problems. Adopting this structure, transversal linear adaptive filter is easy to implement. Assume that polarization isolation is 20 dB At this time, the ratio of energy per information bit to noise power spectral density is: Fig. 3 Deterioration of Eb/N0 in case of QPSK and channel coding. The introduction of polarization interference has no effect on performance of data transmission system
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