Improving frequency synchronization by means of new correlation criteria for fine time synchronization in MIMO system

2005 ◽  
Author(s):  
V. Meghdadi ◽  
A. Saemi ◽  
J.P. Cances ◽  
M.J. Syed ◽  
G. Ferre ◽  
...  
Keyword(s):  
Time Synchronization ◽  
Mimo System ◽  
Frequency Synchronization ◽  
New Correlation ◽  
Fine Time

Time and Frequency Synchronization for MIMO-OFDM Systems

2013 ◽  
Vol 321-324 ◽  
pp. 2888-2891
Author(s):  
Jing Peng Gao ◽  
Chao Qun Wu ◽  
Dan Feng Zhao
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Carrier Frequency Offset ◽  
Time Synchronization ◽  
Multiple Input Multiple Output ◽  
Frequency Offset ◽  
Time Instant ◽  
Frequency Synchronization ◽  
Ofdm Systems ◽  
Frequency Offset Estimation ◽  
Mimo Ofdm

Any carrier frequency offset will cause a loss of subcarrier orthogonality which results in ICI and hence performance degrades severely in MIMO-OFDM systems. In this paper, a time and frequency synchronization solution for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is proposed. The synchronization is achieved using one Constant Amplitude Zero Auto Correlation (CAZAC) sequence-based preamble which is simultaneously transmitted from all transmit antennas in the same OFDM time instant. The synchronization is accomplished sequentially by coarse time synchronization, fractional frequency offset estimation, integral frequency offset estimation and fine time synchronization. The simulation shows that the proposed algorithm can estimate the timing and frequency offsets efficiently in MIMO-OFDM systems, especially in low signal-to-noise ratio condition.

Frequency synchronization for FBMC-based massive MIMO system uplink

2020 ◽  
Vol 41 ◽  
pp. 101096
Author(s):  
Hamidreza Mohammadi ◽  
Hamid Saeedi-Sourck ◽  
Hamidreza Shayanfar
Keyword(s):  
Massive Mimo ◽  
Mimo System ◽  
Frequency Synchronization

scholarly journals Improved Time and Frequency Synchronization Algorithm for 802.11a Wireless Standard based on the SIGNAL Field

2013 ◽  
Vol 3 (1-2) ◽  
Author(s):  
Cong Luong Nguyen ◽  
Anissa Mokraoui ◽  
Pierre Duhamel ◽  
Nguyen Linh-Trung
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
Time Synchronization ◽  
Frequency Synchronization ◽  
Frequency Division ◽  
Carrier Sense Multiple Access ◽  
Ieee 802.11A ◽  
Synchronization Algorithm ◽  
Training Sequences ◽  
Signal Field

Time and frequency synchronization in the IEEE 802.11a OFDM (Orthogonal Frequency Division Multiplexing) wireless communication system is addressed in this paper. Usually synchronization algorithms rely only on training sequences specified by the standard. To enhance the synchronization between stations, we propose to extract known information by both the transmitter and the receiver at the IEEE 802.11a physical layer to be then exploited by the receiver in addition to the training sequences. Indeed the parts of the identified SIGNAL field are either known or predictable from the RtS (Request to Send) control frame when the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism is triggered jointly to bit-rate adaptation algorithms to the channel. Moreover the received RtS control frame allows the receiver to estimate the channel before time synchronization stage improving then the performance of the proposed synchronization algorithm. Simulation results show that the performance of the proposed synchronization algorithm is improved as compared to existing algorithms.

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