Blind channel estimation of MIMO-OFDM systems in satellite communication

Shirmohammadi, Mahdi; Damavandi, Mohammad-Ali

doi:10.1109/ictc.2015.7354643

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…On the other hand, the deterministic technique employs the property of the limited alphabet to the symbol, which converges faster compared to the statistical technique. The main limitation of BCE technique is that it is more complex in the transceiver [17].…”

Section: Blind Channel Estimation (Bce)mentioning

confidence: 99%

A Review Based on Channel Estimation for Optical - Orthogonal Frequency Division Multiplexing

Joseph¹,

Puttamadappa²

2019

IJEET

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Optical -Orthogonal Frequency Division Multiplexing (OFDM) system generally employ in several communication devices such as telephone, radio, television, internet and so on. In the present days, the optical OFDM is one of the significant methods for an effective communication system. In communication technique, the channel estimation plays a major role in finding the characteristics of the channel based on the received data value. In order to manage the communication data, most of the researchers focused on the channel estimation by using different techniques like Minimum Mean Square (MMSE), Least Square, blind, semi-blind and also developed new methodologies in the coherent optical OFDM. This review paper analysed the research works based on the channel estimation algorithms of an optical OFDM and also examined the major limitation of these techniques. This paper will help the researchers to give a better solution for the present drawbacks in the coherent optical OFDM system.Channel estimation techniques commonly categorize as semi-blind, blind, Pilot Aided (PA) channel estimations. The blind channel estimation performs by utilizing the statistics of received data, virtual carriers, cyclic prefix, and received diversity. That blind estimations commonly require the channel to be constant for a huge number of blocks. So, the blind channel estimation approach is not suitable for large mobility applications. The topmost communication standards such as Long-Term Evaluations (LTEs) and digital video broadcasting has increased the system efficiency by using the pilot channel estimation techniques. In large mobility channel estimation, each stage has individual challenges and features due to a long time dispersion, and the fast time-variation of the channels [11]. General procedure for the Channel EstimationPresently most of the communication systems require channel estimation for symbol detection and equalization process. It improves by employing dedicated pilot symbol, which consumes a non-negligible part of power resources and throughput for huge dimensional device/system. The LS approach based channel estimation technique is most suitable for other optical OFDM systems. The physical Visible Light Communication (VLC) channel scheme includes diffuse

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Section: Blind Channel Estimation (Bce)mentioning

confidence: 99%

A Review Based on Channel Estimation for Optical - Orthogonal Frequency Division Multiplexing

Joseph¹,

Puttamadappa²

2019

IJEET

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“…The NC-OFDM-related research mainly focuses on spectrum forming [ 16 ], channel estimation [ 17 ], synchronous [ 18 ], peak ratio suppression [ 19 ], etc., but there is no detailed solution for NC-OFDM satellite communication proposed. OFDM technology is proposed to be applied to the field of satellite communication, and OFDM communication satellites will be developed [ 20 , 21 ]. Recently, in [ 22 ], the authors proposed using NC-OFDM in satellite communication to improve the spectrum efficiency.…”

Section: Introductionmentioning

confidence: 99%

NC-OFDM Satellite Communication Based on Compressed Spectrum Sensing

Wang

Niu

Zhao

et al. 2022

Sensors

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With the fast development of giant LEO constellations, the effective spectrum utilization has been regarded as one of the key orientations for satellite communications. This paper focuses on improving the spectrum utilization efficiency of satellite communications by proposing a non-continuous orthogonal frequency division multiplexing (NC-OFDM) method. Based on the models of NC-OFDM system, we first propose a sub-carrier allocation method by using spectrum sensing to efficiently perceive and utilize the spectrum holes in the satellite communication system. Then, a hybrid genetic particle swarm optimization method is adopted to allocate the channel resources effectively. Finally, simulation results verify that the proposed algorithm can significantly improve the spectrum efficiency of satellite communications.

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“…Another channel estimation method which has been extensively studied is called blind channel estimation method [18][19][20]. The blind channel estimation method presented in [21,22] requires no pilots to estimate the channel state information. Hence, the blind channel estimation method has higher spectrum and data transmission efficiency than the pilot-based channel estimation methods.…”

Section: Introductionmentioning

confidence: 99%

A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems

2018

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Channel estimation is a key technology in improving the performance of the orthogonal frequency division multiplexing (OFDM) system. The pilot-based channel estimation method decreases the spectral efficiency and data transmission rate. Some conventional channel estimation methods cannot suppress the noise effectively, which affects the quality of the final received signals. To solve these two problems, a Haar wavelet decision feedback (DF) channel estimation method, also named the Haar wavelet method, is proposed in this paper. The proposed Haar wavelet method can suppress the noise existing at the estimated channel impulse response (CIR) effectively, based on a time-domain threshold which is a standard deviation of noise obtained by wavelet decomposition. At the same time, the proposed Haar wavelet method just requires inserting one block pilot symbol in front of the first OFDM symbol, which therefore improves the data transmission rate and spectrum efficiency greatly. Simulation results are shown to verify the effectiveness of the proposed Haar wavelet method in multipath channel propagation conditions.

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Blind channel estimation of MIMO-OFDM systems in satellite communication

Cited by 6 publications

References 5 publications

A Review Based on Channel Estimation for Optical - Orthogonal Frequency Division Multiplexing

A Review Based on Channel Estimation for Optical - Orthogonal Frequency Division Multiplexing

NC-OFDM Satellite Communication Based on Compressed Spectrum Sensing

A Haar Wavelet Decision Feedback Channel Estimation Method in OFDM Systems

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