Uplink Interference Analysis of F-OFDM Systems Under Non-Ideal Synchronization

Chen, Hao; Hua, Jingyu; Wen, Jiangang; Zhou, Kai; Li, Jiamin; Wang, Dongming; You, Xiaohu

doi:10.1109/tvt.2020.3041938

Cited by 13 publications

(13 citation statements)

References 29 publications

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“…The system structure of uplink f‐OFDM is shown in Figure 1, 26 where Tx denotes the transmitter and Rx denotes the receiver. Analogous to cyclic prefix OFDM (CP‐OFDM), the whole assigned bandwidth is assumed to be divided into

J

different SBs, and each SB is assigned to a user.…”

Section: General Framework Of F‐ofdmmentioning

confidence: 99%

“…At the Rx, without loss of generality, we assume user

i

is the user of interest (UoI). According to Chen et al, 26 after match filtering, the received signal can be written as

\begin{matrix} right r_{i} (k^{'}) & left = \overset{Signal and INBI}{\overset{⏞}{d_{i}^{' C P} (k^{'} - D_{i}) \otimes f_{i, T x} (k^{'}) \otimes h_{i} (k^{'}) \otimes f_{i, R x} (k^{'})}} \\ right & left + \overset{ITBI}{\overset{⏞}{{falsefalse}_{\sum}^{j = 0, j \neq i} d_{j}^{' C P} (k^{'} - D_{j}) \otimes f_{j, T x} (k^{'}) \otimes h_{j} (k^{'}) \otimes f_{i, R x} (k^{'})}} + z (k^{'}) \otimes f_{i, R x} (k^{'}) \end{matrix},

where

d_{j}^{}

…”

Section: General Framework Of F‐ofdmmentioning

confidence: 99%

“…As demonstrated in Equation (), the target signal suffers from the ITBIs caused by other SBs. The BER performance of the UoI, especially the edge region, declines considerably due to this issue 26 . In order to reduce these ITBIs, an AIC optimization model is designed in this section.…”

Section: Design Of Aic Algorithm In F‐ofdmmentioning

confidence: 99%

See 2 more Smart Citations

A novel out‐of‐band emission suppression method in future wireless communications employing filtered orthogonal frequency division multiplexing waveform

Chen

Wen

Hua

et al. 2022

Int J Communication

Self Cite

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Summary In order to achieve flexible configuration and asynchronous transmission of different subbands (SBs), SB filters are utilized in filtered orthogonal frequency division multiplexing (f‐OFDM) systems to isolate different SBs efficiently. Nevertheless, the price is the insertion of some intrinsic interference.Therefore, the suppression of the out‐of‐band emission (OOBE) between SBs is essential for the system performance improvement of f‐OFDM. According to the system structure of f‐OFDM, an optimization design model based on active interference cancelation (AIC) is proposed in this study, and the optimization design model is solved through second order cone programming. Furthermore, the effectiveness of the proposed AIC algorithm in OOBE suppression is verified by computer simulations. To the whole system, the OOBE suppression also means the decrease of inter‐SB interference (ITBI). In addition, the influences of main parameters, such as the number of the cancelation carriers (CCs), on the OOBE suppression performance of the proposed AIC algorithm, are simulated and analyzed. Moreover, some intrinsic characteristics of the proposed algorithm in parameter configuration are revealed in terms of power spectral density (PSD) and bit error ratio (BER).

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J

different SBs, and each SB is assigned to a user.…”

Section: General Framework Of F‐ofdmmentioning

confidence: 99%

“…At the Rx, without loss of generality, we assume user

i

is the user of interest (UoI). According to Chen et al, 26 after match filtering, the received signal can be written as

\begin{matrix} right r_{i} (k^{'}) & left = \overset{Signal and INBI}{\overset{⏞}{d_{i}^{' C P} (k^{'} - D_{i}) \otimes f_{i, T x} (k^{'}) \otimes h_{i} (k^{'}) \otimes f_{i, R x} (k^{'})}} \\ right & left + \overset{ITBI}{\overset{⏞}{{falsefalse}_{\sum}^{j = 0, j \neq i} d_{j}^{' C P} (k^{'} - D_{j}) \otimes f_{j, T x} (k^{'}) \otimes h_{j} (k^{'}) \otimes f_{i, R x} (k^{'})}} + z (k^{'}) \otimes f_{i, R x} (k^{'}) \end{matrix},

where

d_{j}^{}

…”

Section: General Framework Of F‐ofdmmentioning

confidence: 99%

See 1 more Smart Citation

A novel out‐of‐band emission suppression method in future wireless communications employing filtered orthogonal frequency division multiplexing waveform

Chen

Wen

Hua

et al. 2022

Int J Communication

Self Cite

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“…( 11) is not related with the PDF of the signal amplitudes. So the conclusion that with a determined segmentation point A and clipping value B, the optimal companding function is linear companding function is suited for new OFDM-based waveform candidates, such as filtered-OFDM, windowed-OFDM and circularly pulsedshaped OFDM [21]- [24]. Second, we build a regularized constraint optimization problem to find the parameters for proposed companding scheme given in eqn.…”

Section: Regularization Optimization Based Flexible Hybrid Compandmentioning

confidence: 99%

A Hybrid Companding and Clipping Scheme for PAPR Reduction in OFDM Systems

et al. 2021

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Orthogonal frequency division multiplexing (OFDM) continues to be deployed in 5G communication systems and is likely to be used in beyond 5G (B5G) communication systems as well, due to its many advantages. However, one major drawback with OFDM systems is its high peak-to-average power ratio (PAPR), especially with large bandwidth transmissions. In this paper, we have provided a regularization optimization based flexible hybrid companding and clipping scheme (ROFHCC) used for PAPR reduction in OFDM systems. To reduce the design complexity, the companding function has two parts. It restrains the signal samples with amplitudes over a given value to a constant value for both peak power reduction and small power compensation. For signals with samples less than a given amplitude, they are expanded by a linear companding function. We build a regularization optimization model to jointly optimize the companding distortion as well as the continuity of the companding function for bit error rate (BER) performance as well as power spectral density (PSD) performance. Simulation results indicate that for the same PAPR performance, the proposed companding scheme has an advantage over the referenced companding schemes. For example, when the average signal power is normalized to be 1, we choose both PAPR for ROFHCC scheme and two-piecewise companding (TPWC) scheme as 4 dB, then we can find that at BER = 10 −4 , the minimum required E b /N 0 for ROFHCC scheme is around 2.3 dB lower than TPWC scheme.

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“…For instance, minimally truncated filter with fixed window is required to obtain the aforementioned benefits [9]. However, frequency domain filtering operation is usually applied for simple implementation [11]. Usually in most research works, double FOFDM links are implemented, if there are switchable filtering options, i.e.…”

Section: Introductionmentioning

confidence: 99%

An adaptive channel estimation scheme based on redundancy minimization for filtered OFDM networks

Hasan

Motakabber²,

Habaebi³

et al. 2023

TELKOMNIKA

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Filtered orthogonal frequency division multiplexing (F-OFDM), a technology which is being considered as a promising platform for beyond 4G era is expected to help deliver the new features at millimeter wave in the new 5 th generation of cellular communication. Some of its key features notably better spectral utilization, enhanced throughput and immunity to interference can be enabling for the new cellular standards. These features of filtered OFDM comes with strict requirements of filter design, guard tone managements, and efficient channel state information harness. This paper is intended to propose an intuitive channel estimation scheme which will allow efficient acquisition of channel state information (CSI) through exploiting the redundant steps of the conventional pilot training-based algorithms and by also using an adaptive weight to expedite the minimization of the error between the estimated values and the actual values. Various simulations will follow to demonstrate the superiority of the scheme over traditional pilot-based algorithms and thus prove its utility in the current 5G cellular era.

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Uplink Interference Analysis of F-OFDM Systems Under Non-Ideal Synchronization

Cited by 13 publications

References 29 publications

A novel out‐of‐band emission suppression method in future wireless communications employing filtered orthogonal frequency division multiplexing waveform

A novel out‐of‐band emission suppression method in future wireless communications employing filtered orthogonal frequency division multiplexing waveform

A Hybrid Companding and Clipping Scheme for PAPR Reduction in OFDM Systems

An adaptive channel estimation scheme based on redundancy minimization for filtered OFDM networks

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