Dajie Jiang

Coordinated Multiple Points Transmission for LTE-Advanced Systems

LTE-Advanced systems which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). Coordinated Multi-Point transmission/reception (CoMP) is one of the candidate techniques for LTE-Advanced systems to increase the average cell throughput and cell edge user throughput in the both uplink and downlink. Although CoMP naturally increases system complexity, it has potentially significant capacity and coverage benefits, making it worth a more detailed consideration. In this paper, we focus on the downlink CoMP-MU-MIMO transmission scheme and present some system level performance evaluation which shows that the CoMP-MU-MIMO transmission scheme can bring significant gains to both the average cell throughput and the cell edge user throughput.

Application of BBU+RRU Based Comp System to LTE-Advanced

LTE-Advanced system which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). Coordinated Multi-Point transmission/reception (CoMP) is one of the candidate techniques for LTE-Advanced systems to increase the cell average and cell edge user throughput in the both uplink and downlink. Although CoMP naturally increases system complexity, it has potentially significant capacity and coverage benefits, making it worth a more detailed consideration. In this paper, we present our initial views on the application of BBU+RRU based CoMP system to LTE-Advanced. Furthermore, simulation results for uplink show that the CoMP joint processing can bring significant gains to both the average sector throughput and the 5% of user throughput.

Uplink Coordinated Multi-Point Reception for LTE-Advanced Systems

Coordinated Multi-Point transmission/reception (CoMP) is one of the candidate techniques for LTE-Advanced systems to increase the cell average and cell edge user throughput in both uplink and downlink. This paper presents uplink CoMP-MU-MIMO scheme and the corresponding system level performance evaluation which shows that the uplink CoMP-MU-MIMO joint processing can bring significant gains to both the average sector throughput and the cell edge user throughput.

Scheduling and Link Adaptations for VoIP in TDD-LTE Uplink

the QoS of VoIP service in TDD-LTE uplink is subject to a series of restrictive factors, such as strong inter-cell interference, tight delay budget, less retransmission times, etc. This paper studies different scheduling and link adaptation schemes for VoIP users in TDD-LTE uplink and makes analysis of the corresponding simulation results. To further increase VoIP capacity, this paper proposes an applicable method base on wideband SINR to differentiate UEs (User Equipment) at cell edge from those at cell center. Then two link adaptation schemes are utilized for UEs at cell edge and the effects of the two schemes are compared. Finally, a higher VoIP capacity is achieved.

Preliminary feature and performace comparision between 3GPP LTE Release 8 and IEEE 802.16m

This paper presents a feature comparison between the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Release 8 and Institute of Electrical and Electronics Engineers (IEEE) 802.16m and preliminary system performance comparison. As Orthogonal Frequency Division Multiple Access (OFDMA) mobile broadband air interfaces, LTE and IEEE 802.16m are both International Mobile Telecommunications-Advanced (IMT-Advanced) technologies. LTE and IEEE 802.16m, which both make use of Multiple-Input Multiple-Output (MIMO) channels, have their own features and advantages. This paper compares some features between LTE and IEEE 802.16m in terms of frame structure, effective bandwidth, Hybrid Automatic Retransmission Request (HARQ) and Modulation and Coding Scheme (MCS), which is a valuable replenishment to the former work. The system simulation results show that LTE and IEEE 802.16m achieve similar performance although they are different communication evolution systems from different specification work groups.