Ma Yongkui

Research of VLF ground-penetrating signal receiving technology based on matched filtering

This paper studies on the receiving technique of the very low frequency (VLF) ground-penetrating communication system, and verifies that the matched filtering technology based on the VLF signals receiving system can effectively alleviate the difficulties when receiving the low frequency signals. Then the systems statistic Bit Error Rate (BER) model is built, and the simulation result is analyzed.

Resource allocation with CCI suppression for multiuser MIMO-OFDM downlink in correlated channels

Abstract To minimize the overall transmit power while maintaining a constant data rate and target BER, a downlink adaptive resource allocation algorithm with jointing the exclusive manner and the shared manner is proposed for multiuser MIMO-OFDM system in correlated channels. The algorithm allocates all the subcarriers to different users according to their spatial correlations. The users with high spatial correlation are allocated in the same group and the exclusive manner is applied. The shared manner with an improved null broadening method, which improves the performance of co-channel interference (CCI) suppression and decreases the number of transmit antennas required, is applied between the different group users. As the users direction of departure (DOD) changes very slowly, a looking up table method is used to reduce the computational complexity. The simulation results show that despite the angle spread of DOD, when compared with the exclusive manner, the proposed algorithm improves the spectral efficiency, and when compared with the TDMA-ZF (zero forcing) shared manner, the proposed algorithm decreases the total transmit power by at least 1 dB.