scholarly journals Multiuser Scheduling on the Downlink of an LTE Cellular System

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Raymond Kwan ◽  
Cyril Leung ◽  
Jie Zhang
Keyword(s):  
Communication System ◽  
System Performance ◽  
Long Term Evolution ◽  
Cellular Communication ◽  
Feedback Information ◽  
Optimal Scheme ◽  
Term Evolution ◽  
Multiuser Scheduling ◽  
Reduced Complexity

The challenge of scheduling user transmissions on the downlink of a long-term evolution (LTE) cellular communication system is addressed. In particular, a novel optimalmultiuser scheduler is proposed. Numerical results show that the system performance improves with increasing correlation among OFDMA subcarriers. It is found that only a limited amount of feedback information is needed to achieve relatively good performance. A suboptimal reduced-complexity scheduler is also proposed and shown to provide good performance. The suboptimal scheme is especially attractive when the number of users is large, in which case the complexity of the optimal scheme is high.

scholarly journals Analysis of handover decision making in downlink Long Term Evolution networks

2015 ◽  
Author(s):  
◽  
Israel Oludayo Elujide
Keyword(s):  
Spectral Efficiency ◽  
System Performance ◽  
Long Term Evolution ◽  
Physical Layer ◽  
System Level ◽  
Handover Decision ◽  
Local Averaging ◽  
Term Evolution ◽  
Filtering Technique

This dissertation reports on handover in downlink Long Term Evolution (LTE) networks. The LTE is seen as the technology that will bring about Fourth Generation (4G) mobile broadband experience. The necessity to maintain quality of service for delay sensitive data services and applications used by mobile users makes mobility and handover between base stations in the downlink LTE very critical. Unfortunately, several handover schemes in LTE are based on Reference Symbols Received Power (RSRP) which include measurement error due to limited symbols in downlink packets. However, prompt and precise handover decision cannot be based on inaccurate measurement. Therefore, the downlink LTE intra-system handover is studied with focus on user measurement report. The study centers on preparation stage of the LTE handover procedure. Two different types of physical layer filtering technique namely linear averaging and local averaging are focused upon among others investigated. The performance of LTE conventional physical layer filtering technique, linear filtering, is compared with an alternative technique called local averaging. The output of each physical layer filtering is then used for LTE standardized radio resource layer filtering (otherwise called L3 filtering). The analysis of results from handover decision is based on simulations performed in an LTE system-level simulator. The performance metrics for the results are evaluated in terms of overall system and mobility-related performance. The system performance is based on spectral efficiency and throughput while mobility-related performance is based on handover failure. The performance comparison of the results shows that local averaging technique provides improved system performance of about 51.2 % for spectral efficiency and 42.8% cell-edge throughput for high speed users. Local averaging also produces a reduction of about 26.95% in average number of handover failure when L 3 filtering is applied for low speed mobile terminal. This result confirms that both averaging techniques are suitable for LTE network. Moreover, in the case of high mobility local averaging tends to be better than linear averaging.

scholarly journals High performance turbo encoder using mealy FSM state encoding technique

2018 ◽  
Vol 7 (3.3) ◽  
pp. 255 ◽  
Author(s):  
E Sujatha ◽  
Dr C. Subhas ◽  
Dr M. N. Giri Prasad
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Binary Data ◽  
High Speed ◽  
Long Term Evolution ◽  
Quality Data ◽  
Wireless Communication System ◽  
Term Evolution ◽  
Turbo Encoder

Error-correction Coding plays a vital role to obtain efficient and high quality data transmission, in today’s high speed wireless communication system. Considering the requirement of using high data rates by Long Term Evolution (LTE) system, parallel concatenation of two convolutional encoders were used to design turbo encoder. In this research task a high speed turbo encoder, which is a key component in the transmitter of wireless communication System, with memory based interleaver has been designed and implemented on FPGA for 3rd Generation Partnership Project (3GPP) defined Long Term Evolution – Advanced (LTE-A) standard using Finite state Machine(FSM) encoding technique. Memory based quadratic permutation polynomial (QPP) interleaver shuffles a sequence of binary data and supports any of the 188 block sizes from N= 40 to N= 6144. The proposed turbo encoder is implemented using 28nm CMOS technology and achieved 300 Mbps data rate by using 1% of available total hardware logic. By using the proposed technique, encoded data can be released continuously with the help of two parallel memories to write/read the input using pipelining concept.  

scholarly journals Averting Paging Related Attacks in 4G LTE Communication System

2019 ◽  
Vol 8 (2S4) ◽  
pp. 160-163
Keyword(s):  
Communication System ◽  
Security Analysis ◽  
Long Term Evolution ◽  
Data Rate ◽  
Security Vulnerabilities ◽  
Term Evolution ◽  
Long Time ◽  
4G Lte ◽  
Secured Communication

Long Term Evolution (LTE) objective is to provide secured communication at higher data rate for the users. It’s been long time that the technology is being consumed by the users. However, there are still security vulnerabilities that provides scope for various attacks on the network. One such scenario is that attacks related paging procedure itself. This paper discusses about the possible attacks related to paging and how these attacks affect the security of the network and also propose a scheme to avert these attacks by leveraging the existing LTE communication system and also the simulation of the proposed scheme with the security analysis of the same

Study on Relay System Performance of Simulation Platform Based on LTE-A

2013 ◽  
Vol 347-350 ◽  
pp. 1915-1919
Author(s):  
Zhen Zhang ◽  
Huai Dong Xu ◽  
Yan Gu ◽  
Chen Ming Li
Keyword(s):  
System Performance ◽  
Relay Node ◽  
Long Term Evolution ◽  
Smooth Transition ◽  
Simulation Platform ◽  
Relay System ◽  
Term Evolution ◽  
Lte Advanced

Relay technology is an important technical means to achieve a smooth transition from Long Term Evolution (LTE) to LTE-Advanced (LTE-A). Theoretically, the addition of nodes will improve the performance of the system effectively. While the relay is active nodes, addition of nodes become a new source of interference. Based on the LTE-A simulation platform, the effect of relay node on the system is analyzed.

Sign in / Sign up

Export Citation Format

Share Document