Abstract
A relatively recent idea of extending the benefits of MIMO systems to multiuser scenarios seems promising in the context of achieving high data rates envisioned for future cellular standards after 3G (3rd Generation). Although substantial research has been done on the theoretical front, recent focus is on making Multiuser Multiple-Input Multiple-Output (MUMIMO) practically realizable. This paper presents an overview of the different MU-MIMO schemes included/being studied in 3GPP standardization from LTE (long-term evolution) to LTE Advanced. MU-MIMO system concepts and implementation aspects have been studied here. Various low-complexity receiver architectures are investigated, and their performance assessed through link-level simulations. Appealing performance offered by low-complexity interference aware (IA) receivers is notably emphasized. Furthermore, system level simulations for LTE Release 8 are provided. Interestingly, it is shown that MU-MIMO only offers marginal performance gains with respect to single-user MIMO. This arises from the limited MU-MIMO features included in Release 8 and calls for improved schemes for the upcoming releases.
Highlights
Wireless data usage is increasing faster than ever before
The question is how much sensitive this interference aware (IA) receiver structure is to the knowledge of interfering constellation? To this end, we propose a blind IA receiver in the Appendix which is aware of the interference channel but is unaware of the interfering constellation
This paper provides a detailed overview of the MU-MIMO schemes encountered in 3GPP standardization, from a unique mode in LTE Release 8 to more advanced possibilities offered by LTE Advanced
Summary
Wireless data usage is increasing faster than ever before. Smartphones and broadband-enabled portables, such as laptops or tablets, are seeing high penetration in many markets, and the superior user experience offered by such devices has lead to exponential growth of mobile data traffic as shown in [1]. Significant improvements are expected with the ongoing rollout of OFDMA- (Orthogonal Frequency Division Multiple Access-) based networks: IEEE 802.16x (WiMAX) and 3GPP (3rd generation partnership project) LTE These two standards, they do not fulfill the requirements, are the first steps towards the 4th generation (4G) definition given by the International Telecommunications Union (ITU) and targeting data rates of 100 Mbps in high-mobility applications and 1 Gbps for low-mobility applications such as nomadic/local wireless access. To meet these needs, advanced features are investigated for inclusion in future releases of these standards · indicate the norm of scalar and vector while (·)T , (·)∗, and (·)† stand for the transpose, conjugate, and conjugate transpose, respectively
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