Multi-User Frequency Offset Correction for OFDMA Reverse Link
Summary :
In the reverse link of OFDMA, different users (subcarriers) may have different frequency offsets, which causes severe performance degradation. It is also difficult to estimate/compensate these frequency offsets in the reverse link. Even if the frequency offsets are correctly estimated, the compensation of one subcarrier (or user) may worsen the inter-carrier interference from the frequency offsets of other subcarriers (users). One of the key ideas in this letter is to merge frequency offset compensation into the FFT matrix. The new inverse transform matrix is used in lieu of regular FFT. A single MMSE-based transform is used to perform both inverse Fourier transform and frequency offset compensation. Compared to the conventional methods such as circular convolution, this approach has lower computational complexity with comparable performance.
- Publication
- IEICE TRANSACTIONS on Communications Vol.E95-B No.7 pp.2481-2484
- Publication Date
- 2012/07/01
- Publicized
- Online ISSN
- 1745-1345
- DOI
- 10.1587/transcom.E95.B.2481
- Type of Manuscript
- LETTER
- Category
- Wireless Communication Technologies
Authors
Keyword
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Jungwoo LEE, "Multi-User Frequency Offset Correction for OFDMA Reverse Link" in IEICE TRANSACTIONS on Communications,
vol. E95-B, no. 7, pp. 2481-2484, July 2012, doi: 10.1587/transcom.E95.B.2481.
Abstract: In the reverse link of OFDMA, different users (subcarriers) may have different frequency offsets, which causes severe performance degradation. It is also difficult to estimate/compensate these frequency offsets in the reverse link. Even if the frequency offsets are correctly estimated, the compensation of one subcarrier (or user) may worsen the inter-carrier interference from the frequency offsets of other subcarriers (users). One of the key ideas in this letter is to merge frequency offset compensation into the FFT matrix. The new inverse transform matrix is used in lieu of regular FFT. A single MMSE-based transform is used to perform both inverse Fourier transform and frequency offset compensation. Compared to the conventional methods such as circular convolution, this approach has lower computational complexity with comparable performance.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E95.B.2481/_p
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@ARTICLE{e95-b_7_2481,
author={Jungwoo LEE, },
journal={IEICE TRANSACTIONS on Communications},
title={Multi-User Frequency Offset Correction for OFDMA Reverse Link},
year={2012},
volume={E95-B},
number={7},
pages={2481-2484},
abstract={In the reverse link of OFDMA, different users (subcarriers) may have different frequency offsets, which causes severe performance degradation. It is also difficult to estimate/compensate these frequency offsets in the reverse link. Even if the frequency offsets are correctly estimated, the compensation of one subcarrier (or user) may worsen the inter-carrier interference from the frequency offsets of other subcarriers (users). One of the key ideas in this letter is to merge frequency offset compensation into the FFT matrix. The new inverse transform matrix is used in lieu of regular FFT. A single MMSE-based transform is used to perform both inverse Fourier transform and frequency offset compensation. Compared to the conventional methods such as circular convolution, this approach has lower computational complexity with comparable performance.},
keywords={},
doi={10.1587/transcom.E95.B.2481},
ISSN={1745-1345},
month={July},}
Copy
TY - JOUR
TI - Multi-User Frequency Offset Correction for OFDMA Reverse Link
T2 - IEICE TRANSACTIONS on Communications
SP - 2481
EP - 2484
AU - Jungwoo LEE
PY - 2012
DO - 10.1587/transcom.E95.B.2481
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E95-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2012
AB - In the reverse link of OFDMA, different users (subcarriers) may have different frequency offsets, which causes severe performance degradation. It is also difficult to estimate/compensate these frequency offsets in the reverse link. Even if the frequency offsets are correctly estimated, the compensation of one subcarrier (or user) may worsen the inter-carrier interference from the frequency offsets of other subcarriers (users). One of the key ideas in this letter is to merge frequency offset compensation into the FFT matrix. The new inverse transform matrix is used in lieu of regular FFT. A single MMSE-based transform is used to perform both inverse Fourier transform and frequency offset compensation. Compared to the conventional methods such as circular convolution, this approach has lower computational complexity with comparable performance.
ER -
English
