Joint SDA-MAP Estimation of Channel and Interference Power in Superposed OFDM Transmission

Kakizki, Yuto; Ohtsuki, Tomoaki; Kam, Pooi Yuen; Kouhei, Suzaki; Sasaki, Hirofumi; So, Hideya

doi:10.1109/glocom.2017.8254794

Cited by 1 publication

(2 citation statements)

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“…When the number of iteration is larger than or equal to 2, LLR Prop is used for the decoding from the next iteration. If the superposed band and the interference power can be known perfectly,p i f (l¯ ) = 1 and p i f (l ) = 0, and then (12) becomes LLR Opt as shown in the following equations.…”

Section: E[·] T Is the Expected Value Note That The Residual Power |mentioning

confidence: 99%

“…Of course, setting LLR correctly requires several information including interference power on each subcarrier, which is not known in general. We have developed various algorithms to estimate the information required for the superposed multicarrier transmission scheme, such as interference position and power [5]- [12]. This paper first introduces the superposed multicarrier transmission scheme.…”

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: E[·] T Is the Expected Value Note That The Residual Power |mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%