Spectrally efficient GFDM and low complexity receiver design = 효율 증대 GFDM의 제안과 저 복잡도 수신기 설계

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High spectral efficiency is one of the most important requirements in the 5th generation communication system. To achieve higher spectral efficiency than 4G standard OFDM, Generalized Frequency Division Multiplexing (GFDM) uses less number of cyclic prefixes (CP) to increase time efficiency. Spectrally Efficient Frequency Division Multiplexing (SEFDM) increases frequency domain efficiency by compressing subcarrier spacing. Both modulation schemes, however, need a complex receiver to cancel out induced inter-carrier interference (ICI). In this paper, Spectrally Efficient GFDM (SEGFDM) scheme is proposed to achieve higher spectral efficiency than GFDM or SEFDM. By investigating minimum distance property, this paper shows that SEGFDM’s subcarrier spacing can be squeezed into 0.94 (called Mazo limit) without performance degradation. However, SEGFDM subcarriers higher ICI due to compact data allocation in the transmission spectrum. So, design good equalizer to deal with interference with low complexity becomes a more critical issue. This paper suggests low complexity receiver for both coded and uncoded system speci?ed for SEGFDM using waveform characteristics. In symbol-level detection scheme, proposed receiver shows similar performance compared to an optimal receiver with low complexity. In bit-level detection scheme, proposed receiver not only has low complexity but also shows performance improvement with over-Mazo limit squeezing. Finally, spectral efficiency is compared to GFDM and SEFDM and SEGFDM shows that there’s transmission rate increase without performance degradation.
Advisors
Moon, Jaekyunresearcher문재균researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2017
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학부, 2017.2,[iii, 35 p. :]

Keywords

Spectrally Efficient GFDM; GFDM; SEFDM; spectral efficiency; iterative detection; sphere decoding; Turbo equalizer; 효율 증대 GFDM; 대역효율; 반복 검출; 터보 등화기

URI
http://hdl.handle.net/10203/243328
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675436&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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