Research On Multiple Access Resource Allocation Scheme For 60GHz Pulse Wireless Communication System

With the continuous development of 60 GH pulsed wireless communication,the number of devices connected to the wireless communication network is growing exponentially,resulting in a shortage of spectrum resources.Wireless communication network designers are faced with the challenge of supporting high capacity and providing good quality of service(QoS).In order to overcome this problem,this paper studies the multiple access technology and cross-layer resource allocation scheme in the 60 GHz pulsed wireless communication system.In a relatively dense indoor environment,due to the dense deployment of wireless network infrastructures,the problems that multiple access interference and QoS cannot be satisfied are much more intractable.Therefore,this paper focus on the solutions to avoid or reduce multiple access collisions,a cross-layer resource allocation strategy based on maximum and minimum rate limiting is proposed,in which the frequency and time hopping pulse position modulation(FTH-PPM)multiple access modules and the cross-layers resource scheduling module is introduced into the 60 GHz pulsed wireless communication system.The strategy provides a technical reference for the application of 60 GHz pulsed wireless communication.This paper studies the combination of UWB(Ultra Wideband)pulsed wireless communication technology and 60 GHz technology.Firstly,a 60 GHz pulsed wireless communication system model based on FTH-PPM multiple access modulation is established;then based on the analysis on the multiple access performance of FTH-PPM,a theoretical analysis model of system error performance is established.Afterwards,simulation results show the performance of the 60 GHz FTH-PPM BER(Bit Error Rate)versus the number of frequency hopping and time-hopping codes,the signal-to-noise ratio,and the number of users,and make comparisons with the TH-PPM and TH-PAM schemes,respectively.it is observed that by adjusting the frequency hopping code,the signal-to-noise ratio,and the number of users,the system's multiple access performance can be improved,and according to the value of the pulse duty cycle to select the appropriate multiple access modulation mode,in some degree,the performance of the system with FTH-PPM scheme is much better than with TH-PPM and TH-PAM scheme.Secondly,in the 60 GHz pulsed wireless communication system,based on the cross-layer design,a cross-layer resource allocation strategy based on maximum and minimum rate limits is proposed.The user's queue status and QoS are analyzed at the MAC layer to obtain the relationship between packet loss and user rate.Then,the packet loss constraint at the MAC layer is converted into the physical layer maximum and minimum rate constraints,and the physical layer uses the two obtained rates as constraints to make power allocation dynamically.Simulation results show that compared with the power allocation algorithm without rate constraint,the proposed algorithm not only improves the throughput of the entire system,but also saves a certain amount of power on the premise that the user achieves the best QoS,so that the system performance is improved to some extent.