Direct Spectrum Division Transmission for Highly Efficient Frequency Utilization in Satellite Communications

Abe, Jun-ichi; Yamashita, Fumiyoshi; Katsuya, Nakahira; Kobayashi, Kiyoshi

doi:10.1587/transcom.e95.b.563

Cited by 10 publications

(11 citation statements)

References 6 publications

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“…In [4], a Nyquist-based filter bank was designed to implement the analysis and synthesis of arbitrary waveforms. Different from [18], the proposed filter bank partitions the signal into multiple subspectra with arbitrary bandwidth with no more bandwidth occupied.…”

Section: Literal Review and Background Workmentioning

confidence: 99%

“…We do not concern the implementation of filter banks, and only consider the filtered subspectra. The frequency-domain raised cosine roll-off filter designed by Nyquist criterion is used as the analysis and synthesis filter [4]. Expression of the subspectrum filter in frequency domain is given by…”

Section: Problem Description and Problem Formulationmentioning

confidence: 99%

“…The implementation for segmentation and aggregation can use frequency-domain filter banks [4] and time-domain filter banks [18].…”

Section: Problem Description and Problem Formulationmentioning

confidence: 99%

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On the performance of non‐contiguous carrier aggregation in presence of subspectral errors

et al. 2023

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Carrier aggregation can not only increase communication bandwidth, but also improve spectrum efficiency and communication security. Considering the non‐contiguous multi‐subspectrum aggregation for the spectrum division transmission of arbitrary signal, the paper analyzes the performance impact on the demodulation of aggregated signal in the presence of subspectral amplitude and phase errors in receiver. The theoretical bit‐error rates (BER) of quaternary phase‐shift keying and M‐ary phase‐shift keying are derived to clarify the subspectrum synchronization accuracy requirements in non‐contiguous carrier aggregation. In addition, two adaptive equalizers requiring no pilot overhead are introduced to correct the distortion of aggregated signal caused by the subspectral errors. Both algorithms need no estimation of synchronization error but also have the tracking capability of phase error even with subspectral carrier error. Simulation results show the reliability of the theoretical BER performance and the excellent performance of the equalization algorithms.

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Section: Literal Review and Background Workmentioning

confidence: 99%

Section: Problem Description and Problem Formulationmentioning

confidence: 99%

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On the performance of non‐contiguous carrier aggregation in presence of subspectral errors

et al. 2023

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“…In the DSDT adapter on the Tx side, a single carrier modulated signal output from the existing modem is converted into the frequency domain by using a fast Fourier transform (FFT), then divided into multiple subspectra with arbitrary bandwidth by a spectrum dividing filter bank. The dividing filters have a special frequency response that reduces the roll-off factor of each sub-spectrum to generate sub-spectra with root roll-off characteristics and decrease the occupied bandwidth after spectrum division [8]. The divided sub-spectra are set on unused frequency resources and converted into the time domain by using inverse FFT (IFFT).…”

Section: Overview Of Direct Spectrum Division Transmissionmentioning

confidence: 99%

Feasibility verification of direct spectrum division transmission over multiple satellite transponder

et al. 2020

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We have been proposing a direct spectrum division transmission (DSDT) technique that can divide a single carrier signal into multiple subspectra and assign them to dispersed frequency resources of a satellite transponder to improve spectrum utilizing efficiency. This letter overviews the concept of DSDT and shows the results of feasibility verification on DSDT via satellite experiments. In a past study, we carried out fundamental satellite experiments on DSDT over a single transponder. This time, we conduct satellite experiments on DSDT over multiple transponders by using the latest DVB-S2X format signal. The BER performances of signals divided by the DSDT technique were almost the same as that of a single-carrier. We confirmed that DSDT was practical.

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“…7 Although the spectrum compression/division transmissions have the potential to effectively utilize bandwidth and power, we did not discuss a channel allocation algorithm for earth stations using these transmission techniques, the time-varying radio propagation environments for which differ. To address this issue, this paper proposes an adaptive spectrum controlling (SPCT) algorithm that optimizes the transmission parameters such as spectrum compression ratio, a combination of modulation method and FEC coding rate (MODCOD), transmission power, and bandwidth so that it makes very high use of W sys and P sys .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Allocation of a Spectrum Controlled Channel Applicable to Propagation Variation for SATCOM Systems

Katsuya

Mashino

Abe

et al. 2014

32nd AIAA International Communications Satellite Systems Conference

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This paper proposes a novel channel allocation algorithm to effectively use satellite resources such as a satellite's maximum transponder bandwidth and maximum transmission power for SATCOM systems, and to handle propagation gain variation in all earth stations. The proposed adaptive spectrum controlling (SPCT) algorithm uses two new transmission techniques we have developed: spectrum compression and division transmission. The SPCT algorithm controls various transmission parameters such as spectrum compression ratio, MODCOD, transmission power, and bandwidth to satisfy the constant transmission bit rate. Simulation results show the SPCT algorithm achieves system throughput up to 1.3 times higher than that achieved with a simple algorithm based on the conventional adaptive coding and modulation (ACM). NomenclatureC Spectrum compression ratio G u Up-link free-space loss rate G satr Receiving satellite anntena gain P r Satellite power utilization P max Earth station's maximum transmission power W r Satellite bandwidth utilization X ACM mode identifier Symbols η Spectrum utilization efficiency γ Evaluation value for channel optimization

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Direct Spectrum Division Transmission for Highly Efficient Frequency Utilization in Satellite Communications

Cited by 10 publications

References 6 publications

On the performance of non‐contiguous carrier aggregation in presence of subspectral errors

On the performance of non‐contiguous carrier aggregation in presence of subspectral errors

Feasibility verification of direct spectrum division transmission over multiple satellite transponder

Dynamic Allocation of a Spectrum Controlled Channel Applicable to Propagation Variation for SATCOM Systems

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