Hardware-Efficient Blind Frequency Offset Estimation for Spectral-Efficient Digital Subcarrier Multiplexing Systems

Lv, Hong; Xiang, Meng; Wu, Ruitao; Ma, Yunhe; Li, Jianping; Xu, Ou; Peng, Di; Qin, Yuwen; Fu, Songnian

doi:10.1109/jlt.2022.3163017

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…In this section, the computational complexity of the proposed FOE scheme is analyzed. The complexity of two reported blind FOEs for DSCM systems from [13,15] are also referred to as comparisons.…”

Section: Complexity Analysismentioning

confidence: 99%

“…Then, two blind FOE algorithms reported for DSCM systems are referred to as comparisons; the FOE algorithm from [13] shall be referred to as blind-scheme1, and the FOE algorithm from [15] will be indicated as blind-scheme2 for convenience. These two algorithms also use a two-stage FOE structure.…”

Section: Complexity Analysismentioning

confidence: 99%

“…The complexity comparison is made under the same estimation accuracy for three FOE algorithms. To achieve this goal, the parameter N FFT is 1024 for all algorithms based on the principle introduced in [13,15] and our simulation for these algorithms. With the prerequisite stated above, the complexity of the pilot tone-based FOE is 40 real multiplications per symbol, just the same as that of blind-scheme1.…”

Section: Complexity Analysismentioning

confidence: 99%

“…In addition, a FOE algorithm based on the summed power of spectral components is carried out. It resorts to the total power change caused by FO within a specific bandwidth to evaluate FO [15]. But, this algorithm is only suitable for DSCM systems employing symmetrically distributed subcarriers.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the two-stage FOE structure for reducing computational complexity is described, and the interaction between the pilot tone-to-signal power ratio (PSR) and the Q-factor is discussed in this section. Then, the complexity of the proposed algorithm and two reported FOE algorithms from [13,15] are analyzed and compared under the assumption of the same estimation accuracy in Section 3. In Sections 4 and 5, simulations and offline experiments verify that the proposed algorithm is tolerant to CD and feasible for DSCM systems.…”

Section: Introductionmentioning

confidence: 99%

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A Chromatic Dispersion-Tolerant Frequency Offset Estimation Algorithm Based on Pilot Tone for Digital Subcarrier Multiplexing Systems

Zhang,

Chen,

Yang

et al. 2024

Photonics

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A digital subcarrier multiplexing (DSCM) system has been proposed as a possible solution for large capacity and long-distance coherent optical transmissions due to its high tolerances for chromatic dispersion (CD), equalization-enhanced phase noise (EEPN) and fiber nonlinearity. In a DSCM receiver, for subcarrier-demultiplex to occur properly, frequency offset estimation (FOE) must be implemented before demultiplexing. It is beneficial to decrease complexity and EEPN by compensating CD on each subcarrier. Therefore, a high CD tolerance is indispensable for the FOE algorithm in a DSCM receiver. However, the mainstream blind FOE algorithms for single-carrier systems, such as the 4th power fast Fourier transform algorithm, could not work for DSCM systems. To deal with this challenge, a pilot tone-based FOE algorithm with high CD tolerance is proposed and verified using simulations and offline experiments. The final estimation accuracy of about 10 MHz of the proposed two-stage FOE is achieved at low computational complexity. Simulations and offline experiments show that DSCM systems with the proposed algorithm have a 0.5~1 dB Q-factor improvement over Nyquist single-carrier systems.

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Section: Complexity Analysismentioning

confidence: 99%

Section: Complexity Analysismentioning

confidence: 99%

Section: Complexity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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