A Blind Phase Compensation Method for Direct Spectrum Division Transmission

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

doi:10.1109/glocom.2011.6133980

Cited by 8 publications

(12 citation statements)

References 6 publications

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“…Since both sub-spectra and combining filters have root roll-off characteristics and the cutoff frequencies between combining filters are the same, the signal after the spectrum combination has a flattened pass band and exhibits the The phase characteristics of the combined signals become discontinuous because each Rx sub-spectrum undergoes independent phase offset due to the unsynchronized clock timing between Tx and Rx side. The DSDT adapter estimates the phase differences between Rx sub-spectra from the transition band of adjacent sub-spectra and compensates them [9]. Thus, the phase characteristics become continuous.…”

Section: Overview Of Direct Spectrum Division Transmissionmentioning

confidence: 99%

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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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Section: Overview Of Direct Spectrum Division Transmissionmentioning

confidence: 99%

“…IEICE Communications Express, Vol 9,. No.2,[48][49][50][51][52][53] (i) Experimental Setup for satellite experiments (ii) Spectrum arrangement over satellite transponders (b) Spectrum arrangement over a single transponder (c) Spectrum arrangement over multiple transponders (a) Spectrum arrangement without spectrum divisionFig.…”

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Feasibility verification of direct spectrum division transmission over multiple satellite transponder

et al. 2020

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“…This is a technique to transmit data with multiple divided spectra on the transmission and receiver sides, in which the divided spectra are combined. One method of this type was proposed and labeled "direct spectrum division transmission" in [5][6][7]. The spectrum was divided by using a modified filter bank and succeeded in suppressing the dividing loss of frequency resources.…”

Section: A Direct Spectrum Division Transmissionmentioning

confidence: 99%

“…Finally, in step 4, when the transmission data is input, the terminal monitors all sub-channels as carrier sense, selects the combination with the highest occurrence frequency in the latest table from the detected currently available channels, and transmits the data. In this example, subchannel combination (1,2,7,9) is the highest and available. Therefore, the combination (1,2,7,9) is selected to transmit.…”

Section: = { | Is Combination Of 4 Elements Of } (3) Wherementioning

confidence: 99%

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Dynamic channel selection method for direct spectrum division transmission in CSMA systems

Murayama

Katsuya

Morikura

2015

2015 21st Asia-Pacific Conference on Communications (APCC)

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This paper proposes a dynamic channel selection method for direct spectrum division transmission systems, which are autonomous decentralized control systems like CSMA/CA systems, in order to use frequency resources efficiently. In the method each terminal monitors the usage status of the whole system bandwidth, then searches for and memorizes all combinations of currently vacant channels. When the terminal transmits data it selects the combination having the lowest occupancy rate for the transmission. The method's effectiveness was confirmed in discrete event simulations with probabilistic resource sharing between terminals. The aggregate throughput improvement compared with simple random selection achieved in the simulations ranged between 2.5% and 11%.

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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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A Blind Phase Compensation Method for Direct Spectrum Division Transmission

Cited by 8 publications

References 6 publications

Feasibility verification of direct spectrum division transmission over multiple satellite transponder

Feasibility verification of direct spectrum division transmission over multiple satellite transponder

Dynamic channel selection method for direct spectrum division transmission in CSMA systems

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

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