Research On Related Issues Of 60GHz Pulse Communication System

With the rapid development of multimedia technology, the production of film and television programs with HD resolution has increasing day by day, the demand for wireless communication with high transmission rate has become especially urgent. But, due to the limitations of spectrum resource, transmitting power and other factors, Wi-Fi, UWB and other short-range wireless communication technologies could not achieve Gbps transmission rate.With apparent advantages of up to several Gbps transfer rate,several GHz license-free spectrums,10W maximum transmit power, super anti-jamming capability,ease of barrier characteristics and so forth,60GHz wireless communication technology has become the first choice for Gbps level short-range wireless communications. It is considered one of the most promising wireless transmission and received extensive attention and received widespread attention.Currently, most of the studies of 60GHz wireless communications are concentrated on high-speed wireless communications chip technology, channel measurement, transceiver system design and hardware designand so on,while detailed discussions of the design of 60GHz pulse generator, capacity and error rate analysis is deficient.On the other hand, existing 60GHz wireless communications systems are basically based on single carrier or Orthogonal frequency division multiplexing (OFDM) modulation schemes. But such systems have many disadvantages,such as the complex structure,high-power consumption, sensitive to the channel’s multipath fading effects and so on, which will spend a higher cost and price and not conducive to the overall system design and implementation.Based on the above issues,the 60GHz pulses are designed based on carrier and without carrier. And at the same time, the design of 60GHz pulse generator is proposes in this paper, which can meet the FCC spectral mask. Through the comparison of several pulses, when the SNR is same, the difference of BER is very smalland the performance improvement is not obvious, so when choosing a pulse we should consider all aspects of the impact factor and ultimately determine the ideal design. Although, the spectrum efficiency of the carrier pulse system is a little worse than the pulse without carrier system, the realization of the circuit structure is relatively simple and it is easier to the circuit design and the implement of system, so so it is preferred.Firstly,in this paper we have a brief description of the background,the features and advantages, research status and the facing problems and challenges of 60GHz wireless communications.Secondly, we introduce the propagation characteristics and channel models of 60GHz millimeter-wave and mainly describes the IEEE 802.15.3c channel model:the correlation properties of large-scale fading and small-scale fading,and the mathematical model is set up to facilitate the future research. Finally, three 60GHz pulse waveforms are designed and a design of 60GHz pulse generator based on spectrum shifting method is proposed,and their performance of capacity and BER is analyzed too.Some conclusions were derived as follows. Firstly,60GHz pulse waveforms presented deep effects on the performance of 60GHz pulse communication systems, so it is very important to design appropriate pulses. Secondly,60GHz wireless communication system is suitable for short-range high-speed wireless communications. Thirdly, since almost all the energy of the received signal is concentrated in the first arrival path and negligible in the other multipaths, CM1 channel presents unobvious multipath effects and much better performance.While CM2 channel is a typical frequency selective multipath fading channel, and energy of the received siganal is scattered over a large number of multipaths duing to reflection, scattered color and other factors. Fourthly, the parameter selection and settings also have an important impact on the pulse waveform, and reasonable parameter settings will let the simulation results more closer to the actual needs.All the work in this paper mainly about analysis of characteristics of 60GHz millimeter wave,60GHz channels, design of the 60GHz pulse waveforms and generator design, and study of bit error rate and capacity performance, to some extent,have improved the theoretical basis of the 60GHz pulse communication and provided theoretical support and help for the future design of a system or circuit aspects. According to the different needs in the future,this pulse generator can be modified more or less, which can be applied to the emission section of UWB pulse or the sampling downconversion receiver and so on, and there will be a very good value.And which will have great significanceto promote further research and applications of 60GHz wireless communication technology.