Two-Stage Method for Joint Estimation of Information Symbols and Channel Frequency Response in OFDM Communication Systems

2020 ◽  
Vol 63 (8) ◽  
pp. 418-429
Author(s):  
O. Yu. Myronchuk ◽  
A. A. Shpylka ◽  
S. Ya. Zhuk
Keyword(s):  
Frequency Response ◽  
Communication Systems ◽  
Joint Estimation ◽  
Two Stage ◽  
Channel Frequency Response

scholarly journals Two-Stage Channel Frequency Response Estimation in OFDM Systems

2020 ◽  
Vol 6 (2) ◽  
pp. 1001-1007
Author(s):  
Oleksandr Myronchuk ◽  
◽  
Oleksandr Shpylka ◽  
Serhii Zhuk ◽  
◽  
...  
Keyword(s):  
Frequency Response ◽  
Ofdm Systems ◽  
Two Stage ◽  
Channel Frequency Response

Algorithm Of Two-Stage Channel Frequency Response Estimation In OFDM Systems Based On Kalman Filter

2021 ◽  
Author(s):  
Oleksandr Myronchuk ◽  
Oleksandr Shpylka ◽  
Serhii Zhuk ◽  
Yurii Myronchuk
Keyword(s):  
Kalman Filter ◽  
Frequency Response ◽  
Ofdm Systems ◽  
Two Stage ◽  
Channel Frequency Response

MULTISTAGE MICROSTRIP UHF LOAD

2018 ◽  
pp. 53-57 ◽  
Author(s):  
G. G. Savenkov ◽  
V. P. Razinkin ◽  
A. D. Mekhtiev
Keyword(s):  
Frequency Response ◽  
Frequency Band ◽  
High Power ◽  
Two Stage ◽  
High Power Microwave ◽  
Modelling Method ◽  
Optimal Values ◽  
Inductive Elements ◽  
Power Microwave

Applications of modern terminal loads and its relevant disadvantages are described in this paper. The decomposing method of wideband microwave high power microstrip loads design is proposed in this paper with purpose of matching quality improving. Multiple extension of multistage load bandwidth is provided by using of external matching circuit and internal matching inductive elements. The maximum reachable bandwidth of multistage load is estimated and optimal values of mathing circuit elements are founded on basis of equivalent lumped scheme. The topology of microstrip two-stage high power microwave load is developed and its frequency response, calculated via numeric electrodynamic modelling method is outlined in the paper. Modelling results show good matching quality of considered load at the frequency band below 3,5 GHz.

scholarly journals Efficient Joint Estimation and Compensation of CFO, Tx/Rx Frequency-Selective I/Q Imbalance, and the MIMO Radio Channel in OFDM Systems

2013 ◽  
Vol 2013 ◽  
pp. 1-20 ◽  
Author(s):  
Jian Luo ◽  
Wilhelm Keusgen ◽  
Andreas Kortke
Keyword(s):  
Carrier Frequency ◽  
Communication Systems ◽  
Complexity Analysis ◽  
Radio Channel ◽  
Direct Conversion ◽  
Joint Estimation ◽  
Ofdm Systems ◽  
Rf Impairments ◽  
Mimo Ofdm ◽  
Frequency Selective

MIMO OFDM is a very promising technique for future wireless communication systems. By applying direct conversion architecture, low-cost, low-power, small size, and flexible implementation of MIMO OFDM systems can be realized. However, the performance of direct conversion architecture-based MIMO OFDM systems can be seriously affected by RF impairments incling carrier frequency offset (CFO) and I/Q-imbalance. While OFDM is sensitive to CFO, direct conversion architecture is sensitive to I/Q imbalance. Such RF impairments aggravate as the carrier frequency becomes higher for example, beyond 60 GHz. To achieve the desired high performance of MIMO OFDM, such RF impairments have to be compensated for. In this paper, the joint compensation of CFO, transmitter and receiver frequency-selective I/Q imbalance, and the MIMO radio channel is investigated. Two preamble-based schemes are proposed for impairment parameter estimation. The proposed preambles are constructed both in time and frequency domains and require much less overhead than the state-of-the-art designs. Furthermore, much lower computational complexity is allowed, enabling efficient implementation. The advantages and effectiveness of both proposed schemes are compared and verified by numerical simulations and complexity analysis.

EFFICIENT DESIGN OF NARROWBAND COSINE-MODULATED FILTER BANKS USING A TWO-STAGE FREQUENCY-RESPONSE MASKING APPROACH

2003 ◽  
Vol 12 (05) ◽  
pp. 631-642 ◽  
Author(s):  
SERGIO L. NETTO ◽  
LUIZ C. R. de BARCELLOS ◽  
PAULO S. R. DINIZ
Keyword(s):  
Computational Complexity ◽  
Frequency Response ◽  
Filter Bank ◽  
Filter Banks ◽  
Efficient Design ◽  
Arithmetic Operations ◽  
Two Stage ◽  
Minimax Method ◽  
Frequency Response Masking ◽  
Frm Approach

A new cosine-modulated filter bank (CMFB) structure is proposed based on the frequency-response masking (FRM) approach using masking filter decomposition. The resulting structure, the so-called FRM2-CMFB, presents reasonable computational complexity (number of arithmetic operations per output sample) and allows one to design filter banks with extremely large number of bands. The examples include the use of M=1024 bands, where the standard minimax method cannot be employed. These examples indicate that the reduction in computational complexity can be as high as 60% of the original FRM-CMFB structure, which does not use masking filter decomposition.

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