Frequency symbol spreading based adaptive subcarrier block selection for OFDMA system |
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Authors: | Chang-Jun Ahn Dongsoo Har Tatsuya Omori Ken-ya Hashimoto |
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Affiliation: | 1. Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, Chiba 263-8522, Japan;2. Department of Information and Communications, Gwangju Institute of Science and Technology, 261 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea |
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Abstract: | In a wireless network, the signals transmitted from one sender to different users have independent channel fluctuation characteristics. The diversity that exists between users is called multiuser diversity and can be exploited by the sender to enhance the capacity of wireless network. In multiuser diversity OFDMA system, exploiting channel fluctuation diversity is in essence done by selecting the user with the strong subcarrier channels. The individual subcarrier selection for each user can achieve the best system performance but high signaling overhead and high system complexity are required. On the other hand, the adaptive subcarrier block method achieves worse BER than that of individual subcarrier selection. This is because the selected block contains the poor channel subcarriers. To overcome this problem, in this paper, we propose an adaptive subcarrier block selection with frequency symbol spreading for an OFDMA system. |
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