Optimum timing acquisition for high efficiency OFDM system in wireless communications

2016 ◽  
Vol 9 ◽  
pp. 397-401
Author(s):  
Sangjin Ryoo
Keyword(s):  
Wireless Communications ◽  
High Efficiency ◽  
Ofdm System ◽  
Timing Acquisition

An Improved Resource Management Method in Mobile Wireless Communications

2010 ◽  
Vol 20-23 ◽  
pp. 872-877
Author(s):  
Gang Yong Lin ◽  
Sheng Hui Dai ◽  
Shan Long Ma
Keyword(s):  
Resource Management ◽  
Wireless Communications ◽  
Mobile Devices ◽  
Bandwidth Allocation ◽  
Communication Systems ◽  
High Efficiency ◽  
Radio Resource Management ◽  
Radio Resource ◽  
Typical Situation ◽  
Multiple Services

The increasing use of wireless communications in mobile devices starts a new level of resource management. Users with mobile devices accessing wireless hot spots are a commonplace, and, thus, their management is becoming more important. Therefore, efficient utilization of radio resource becomes a key point in the design of broadband systems. From the view of the development of radio resource management, current technologies have quite good performance and high efficiency when the category of service is single. However, when multiple services take place simultaneously, the system has to emphasize on some certain kinds of services and degrade the performance of others. Moreover, the wireless network is not able to detect collision and monitor the channel status as is the wire line network, which makes it more difficult to design the management scheme. This paper introduces and analyzes current main technologies of radio resource management, discusses the key technical points on designing the scheme, and then offers a new proposal of uplink radio resource allocation scheme in broadband systems. Based on the detailed illustration of the algorithm, a simulation system is established to verify it, which is adapted to the typical situation of broadband wireless communication systems. The theory analysis and the simulation results show that the new method successfully resolves the uplink bandwidth allocation problem for the simultaneous multiple services, satisfies the different requirements of delay and bandwidth of different services, and also reduces the protocol wasting and transmission delay.

An Iterative Frequency Offset Estimation Algorithm for OFDM System

2013 ◽  
Vol 765-767 ◽  
pp. 2858-2861
Author(s):  
Feng Zheng ◽  
Yun Tang ◽  
Hang Liu
Keyword(s):  
Data Structure ◽  
Wireless Communications ◽  
Iterative Algorithm ◽  
Orthogonal Frequency Division Multiplexing ◽  
Estimation Algorithm ◽  
Frequency Offset ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Frequency Offset Estimation ◽  
Ofdm System

Orthogonal Frequency Division Multiplexing (OFDM) is considered as an important technique for future wireless communications. In addition, OFDM has a better performance at inter symbol interference (ISI). One of the major disadvantages of the multi-carrier modulation is about the sensitivity of the performance to a frequency offset. In this paper, we propose an iterative algorithm of frequency offset estimation for the OFDM system. The fundamental algorithm of our iterative algorithm is the frequency pilot aided algorithm. When we get a result with the fundamental algorithm every time, we use the result to estimate for a second time. The algorithm we proposed does not require some additional pilots or changing the data structure of the fundamental algorithm.

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