Spectrally Efficient OFDM Pilot Waveform for Channel Estimation

Chen, Wei-Chang

doi:10.1109/tcomm.2016.2616859

Cited by 20 publications

(5 citation statements)

References 39 publications

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“…In one of the categories, the channel parameters can be estimated by sending training sequence or inserting pilot structure which is known to the receiver. Especially, one can realize adaptive channel estimation (ACE) by repeating this process periodically [6][7][8][9][10][11][12][13]. Linear channel estimation methods in [14,15] use an adaptive filter to estimate channel information.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Blind Channel Estimation for MIMO-OFDM Systems Based on PARAFAC

Yang

Zhang

Lou

2020

Wireless Communications and Mobile Computing

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In order to track the changing channel in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems, it is prior to estimate channel impulse response adaptively. In this paper, we proposed an adaptive blind channel estimation method based on parallel factor analysis (PARAFAC). We used an exponential window to weight the past observations; thus, the cost function can be constructed via a weighted least squares criterion. The minimization of the cost function is equivalent to the decomposition of third-order tensor which consists of the weighted OFDM data symbols. To reduce the computational load, we adopt a recursive singular value decomposition method for tensor decomposition; then, the channel parameters can be estimated adaptively. Simulation results validate the effectiveness of the proposed algorithm under diverse signalling conditions.

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Section: Introductionmentioning

confidence: 99%

Adaptive Blind Channel Estimation for MIMO-OFDM Systems Based on PARAFAC

Yang

Zhang

Lou

2020

Wireless Communications and Mobile Computing

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“…To suppress the spectral side lobe, the windowing for smoothing the transition of the OFDM envelope has been examined [8], but it does not sufficiently suppress the OoBE. Thus, technologies that can maintain the orthogonality between subcarriers to increase the bit error rate (BER) performance while suppressing the OoBE and inserting pilots have been developed [9][10][11]. These methods are relatively well handled mathematically but have high implementation complexity.…”

Section: Introductionmentioning

confidence: 99%

Least squares decoding in binomial frequency division multiplexing

2023

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This paper proposes a method that can reduce the complexity of a system matrix by analyzing the characteristics of a pseudoinverse matrix to receive a binomial frequency division multiplexing (BFDM) signal and decode it using the least squares (LS) method. The system matrix of BFDM can be expressed as a band matrix, and as this matrix contains many zeros, its amount of calculation when generating a transmission signal is quite small. The LS solution can be obtained by multiplying the received signal by the pseudoinverse matrix of the system matrix. The singular value decomposition of the system matrix indicates that the pseudoinverse matrix is a band matrix. The signal-tointerference ratio is obtained from their eigenvalues. Meanwhile, entries that do not contribute to signal generation are erased to enhance calculation efficiency. We decode the received signal using the pseudoinverse matrix and the removed pseudoinverse matrix to obtain the bit error rate performance and to analyze the difference.

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“…The scheme is excellent in terms of performance, but is quite complicated in terms of implementation. The pilot pattern was designed to suppress spectral side lobes in systems that process data and pilot waveforms separately [11]. This method can insert pilots while minimizing the impact on data symbols, but the implementation complexity is rather high.…”

Section: Introductionmentioning

confidence: 99%

Spectrally encapsulated OFDM: Vectorized structure with minimal complexity

Kim¹,

Kwak

Jung

et al. 2021

ETRI Journal

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To efficiently use frequency resources, the next 6th generation mobile communication technology must solve the problem of out‐of‐band emission (OoBE) of cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM), which is not solved in 5th generation technology. This study describes a new zero insertion technique to replace an existing filtering scheme to solve this internal problem in OFDM signals. In the development of the proposed scheme, a precoder with a two‐dimensional structure is first designed by generating a two‐dimensional mapper and using the specialty of each matrix. A spectral shaping technique based on zero insertion instead of a long filter is proposed, so it can be applied not only to long OFDM symbols, but also very short ones. The proposed method shows that the transmitted signal is completely blocked at the bandwidth boundaries of signals according to the current standards, and it is confirmed that the proposed scheme is ideal with respect to bit error rate (BER) performance because its BER is the same as that of CP‐OFDM. In addition, the proposed scheme can transformed into a real time structure through vectorizing process with minimal complexity.

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Spectrally Efficient OFDM Pilot Waveform for Channel Estimation

Cited by 20 publications

References 39 publications

Adaptive Blind Channel Estimation for MIMO-OFDM Systems Based on PARAFAC

Adaptive Blind Channel Estimation for MIMO-OFDM Systems Based on PARAFAC

Least squares decoding in binomial frequency division multiplexing

Spectrally encapsulated OFDM: Vectorized structure with minimal complexity

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