Total frequency utilization efficiency improvement by superposed multicarrier transmission scheme

Mashino, Jun; Sugiyama, Takatoshi

doi:10.1109/pimrc.2009.5450209

Cited by 14 publications

(12 citation statements)

References 6 publications

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“…Spectrum allocation in superposed multicarrier transmission subcarrier perfectly [4]. This is cause by the wrong setting of initial likelihood for the input of the FEC decoder in the receiver.…”

Section: Superposed Multicarrier Transmissionmentioning

confidence: 99%

“…To reduce the bad effects of wrong setting of initial likelihoods assigned to bits on superposed subcarriers, the initial likelihood masking technique was proposed in [4], which will be explained in the next section.…”

Section: Superposed Multicarrier Transmissionmentioning

confidence: 99%

“…To suppress the effects of interference of superposed subcarriers with practical implementation and without knowledge of interference's signaling, initial likelihood masking, also referred to as FEC metric masking, was proposed in [4]. Fig.…”

Section: Initial Likelihood Maskingmentioning

confidence: 99%

“…2 Initial Likelihood Masking [4] shown that the technique can improve frequency utilization efficiency of superposed multicarrier transmission. The technique is attractive, because it depends on neither the number of interferers nor the signaling of the superposed interference systems.…”

Section: Initial Likelihood Maskingmentioning

confidence: 99%

“…FEC metric masking is one of the techniques to reduce the effects of interference where initial LLRs for superposed subcarriers are replaced by neutral value in the receiver followed by decoding so that the effects of interference can be reduced [4]. However, FEC metric masking requires the information about the interference position that is which subcarriers are interfered, which is not known in advance.…”

Section: Introductionmentioning

confidence: 99%

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[Invited Paper] Superposed Multicarrier Transmission

Ohtsuki

2018

MTA

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A superposed multicarrier transmission scheme is known to improve frequency utilization efficiency where several systems share spectrum without any spectrum spreading techniques. In the superposed multicarrier transmission scheme forward error correction (FEC) coding is in general applied so that the effects of interference caused by superposition of spectrum is mitigated by error correction capability. Thus, the superposed multicarrier transmission scheme is effective under cognitive environments where several wireless systems share the same frequency band. The superposed multicarrier transmission scheme is also expected in broadcasting where wireless communications are also used and can be interfered by other wireless systems. In the superposed multicarrier transmission scheme, to reduce the effects of interference by exploiting the capability of FEC, initial log likelihood ratio (LLR) should be set appropriately. Setting LLR correctly requires several information including interference power on each subcarrier, which are not known in general. We have developed several techniques to estimate the information including interference required for the superposed multicarrier transmission scheme. This paper introduces the superposed multicarrier transmission scheme. This paper also introduces some of our techniques proposed for the superposed multicarrier transmission scheme.

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Section: Superposed Multicarrier Transmissionmentioning

confidence: 99%

Section: Superposed Multicarrier Transmissionmentioning

confidence: 99%

Section: Initial Likelihood Maskingmentioning

confidence: 99%

Section: Initial Likelihood Maskingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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