Hierarchical modulation symbol sharing scheme for multiuser cellular networks

In this paper, a novel hierarchical modulation symbol sharing scheme for multiuser cellular networks is proposed. In order to achieve the maximum channel capacity, various modulation and coding schemes have been developed on Wireless Communication Systems. With good modulation and coding schemes, very high channel capacity could be achieved for 1-to-1 communication systems. Due to different channel conditions of multiple users, high channel capacity of multiple user network systems cannot be achieved with modulation and coding schemes used for 1-to1 communication technology. By exploiting the characteristics of multiple users in cell based multiuser networks, a novel hierarchical modulation symbol sharing scheme for cell based multiuser network systems is proposed. The proposed scheme not only achieves high network capacity but also substantially reduces channel access overhead for cell based multiuser systems. In the proposed symbol sharing scheme, multiple users are able to share one symbol by allocating bits in proper bit positions for each user. Since the proposed scheme allows to provide extra bits to its cell users, multiuser channel access delay could be substantially reduced. The simulation results corroborate the benefits of the proposed scheme. By exploiting the proposed scheme, very high network capacity of the next generation cell based multiuser networks can be achieved.