Turbo Equalization and Channel Re-estimation in OFDM over Doubly-Selective Channel

被引：1
作者：
Teo, Kok Ann Donny [1 ]
Ohno, Shuichi [2 ]
Ishii, Takanori [3 ]
机构：
[1] DSO Natl Lab, SGP, Singapore, Singapore
[2] Hiroshima Univ, Hiroshima 730, Japan
[3] OMRON Corp, Kyoto, Japan
来源：
2010 IEEE INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS, NETWORKING AND INFORMATION SECURITY (WCNIS), VOL 2 | 2010年
关键词：
TIME-VARYING CHANNELS; INTERFERENCE;
D O I：
10.1109/WCINS.2010.5541906
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
We study the application of turbo equalization in orthogonal frequency division multiplexing (OFDM) system over doubly-selective channel. Maximum A Posteriori (MAP) equalization that exploits characteristics of the banded channel structure in OFDM is used in our turbo equalization. In settings similar to Japan's ISDB-T standards, we find that banded channel structure that accounts for only 1 neighboring subcarrier (on one side) is sufficient to ensure a good equalization performance. At moderate Doppler frequency, turbo equalization does not enhance the system performance significantly. Furthermore, the effects of 1) initial channel estimation with turbo equalization; 2) channel re-estimation with turbo equalization are investigated, with the latter conferring greater bit error-rate (BER) enhancement than the former. Channel estimation has a more prominent effect on performance than turbo equalization, as verified by numerical simulations.
引用
收藏
页码：137 / +
页数：2
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