Joint Design Of CTSMA And Coded Slotted ALOHA

With the flourishing of internet of things(IoT)industry,the importance of massive machine type communication(MMTC)is increasingly significant to approach 5th generation wireless communications demand such as the hi-tech concepts of smart cities,smart healthcare,and smart production systems and so on.To meet massive-MTC standards of 5G,the present machine type communication associated technologies(OFDMA based)such as Narrow Band-Internet of Things(NB-IoT),Long Term Evolution-Machine Type Communications(LTE-MTC)and Long Range Wide Area Network(LoRa-WAN)will be constrained.Because Orthogonal Frequency Division Multiple technology is tightly couples the number of available spectrum resources to the number of supportable active users and also the preambles available for MTC communication radio access are limit.Thus,a large number of simultaneous network accesses attempt in OFDM may result in high data collision rate.The problem of Multiple Access Interference(MAI)arises on data detection,user identification and channel estimation.Thus,OFDM technology is no longer for 5G wireless communications.The demand to support ever increasing data rates and massive radio access,while facing limited spectrum resources by current technologies,has led to the development of very sophisticated physical and Medium Access Control(MAC)layer technologies that can better exploit the wireless channels.Due to massive connections in massive MTC grant-free random access is preferred for the sake of saving the control signaling overheads.Thus,non-orthogonal multiple access(NOMA)has been highly recommended by many researchers and institutions around the world to be involved in 5G standards.Currently,various techniques have been proposed based on NOMA to address the challenges in the grant-free random access system.Among them,Compressed Sensing based Multi-User Detection(CS-MUD)and Coded Tandem Spreading Multiple Access(CTSMA)physical layer techniques are novel techniques to solve the multiple access interference(MAI)problem on channel estimation,user identification and data detection.In the past,few researchers have proved that the combination of physical layer technique CS-MUD and MAC layer techniques has a good potential to become future wireless communications standard.After that few research works have proved that the CTSMA physical layer technique has high potential than CS-MUD for data detection and user identification as well high reliability and connectivity of massive devices.Thus,by considering their contribution works a cross layer technique CTSMA and CSA system model has been designed(CTSMA as physical layer technique and coded slotted ALOHA(CSA)as MAC layer technique)to further enhanced the reliability and connectivity of massive number of uncoordinatedly transmitting devices scenario.