TIIS (한국인터넷정보학회)
Current Result Document :
| 한글제목(Korean Title) |
Improved Maximum Access Delay Time, Noise Variance, and Power Delay Profile Estimations for OFDM Systems |
| 영문제목(English Title) |
Improved Maximum Access Delay Time, Noise Variance, and Power Delay Profile Estimations for OFDM Systems |
| 저자(Author) |
Hanho Wang
Sungmook Lim
Kyunbyoung Ko
|
| 원문수록처(Citation) |
VOL 16 NO. 12 PP. 4099 ~ 4113 (2022. 12) |
한글내용
(Korean Abstract) |
|
영문내용
(English Abstract) |
In this paper, we propose improved maximum access delay time, noise variance, and power delay profile (PDP) estimation schemes for orthogonal frequency division multiplexing (OFDM) system in multipath fading channels. To this end, we adopt the approximate maximum likelihood (ML) estimation strategy. For the first step, the log-likelihood function (LLF) of the received OFDM symbols is derived by utilizing only the cyclic redundancy induced by cyclic prefix (CP) without additional information. Then, the set of the initial path powers is sub-optimally obtained to maximize the derived LLF. In the second step, we can select a subset of the initial path power set, i.e. the maximum access delay time, so as to maximize the modified LLF. Through numerical simulations, the benefit of the proposed method is verified by comparison with the existing methods in terms of normalized mean square error, erroneous detection, and good detection probabilities. |
| 키워드(Keyword) |
maximum access delay time
PDP
OFDM
multipath fading channel
ML
|
| 파일첨부 |
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