Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Waveguide communications, millimeter-wave communication

Interference Rejection Techniques of60GHZ Short-Range Wireless Communications

Author LiuYueTeng
Tutor ZhouZheng; SunXueBin
School Beijing University of Posts and Telecommunications
Course Communication and Information System
Keywords 60GHz system model co-channel interference modulation diversity technique
CLC TN928
Type Master's thesis
Year 2013
Downloads 16
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60GHz millimeter-wave short-range wireless communications is the new hot spot of the current research in the field of wireless communications. To achieve Gigabit transmission rate of high-speed wireless communication system is the the new needs of the prospective study in the field of wireless communication.However,60GHz short-range wireless communications system faces some problems to overcome to achieve commercial use. A prominent issue is that60GHz short-range wireless communications system operates in the60GHz band near and also interference between60GHz systems have an impact on the system performance. System interference consists CCI and ACI between60GHz devices. CCI is the interference of the equipment due to occupy the same channel in the same frequency band and ACI is due to spectrum diffusion of the channel.This paper uses the channel model in accordance with international standards to simulate60GHz short-range communication system interference with the surrounding space radio devices.This paper establishs60GHz communication system model in accordance with the mainstream protocol to simulate system co-channel interference on system performance which refer to bit error probability. Based on the above analysis of interference, this paper proposes the modulation diversity technique in a coded modulation system to suppress the co-channel interference. In this paper, the impact of modulation diversity technique on system performance are analyzed in theory.Moreover this paper theoretically derives the criterion of selecting rotation matrix of the modulation diversity technique.At last this paper compares the system performance with and without the modulation diversity technique.The simulation results proves that the modulation diversity technique improves the suppression of the co-channel interference of the60GHz system and the simulation results show that the system performance improves about1db.This paper mainly does the following work:(1)This paper analysises the interference of60GHz neighbor frequency with the60GHz system and then this paper constructs60GHz short range wireless ommunication system model consisting of modulation and demodulation module, encode and decode module, channel module based on the current mainstream protocol of60GHz and then analyzes the impact on the system performance of co-channel interference between different systems.(2) This paper proposes the modulation diversity technique in a coded modulation system to suppress the co-channel interference. In this paper, the impact of modulation diversity technique on system performance are analyzed in theory.Moreover this paper theoretically derives the criterion of selecting rotation matrix of the modulation diversity technique.At last this paper compares the system performance with and without the modulation diversity technique.The simulation results proves that the modulation diversity technique improves the suppression of the co-channel interference of the60GHz system by1db.

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