Adaptive bit loading for OFDM systems with imperfect channel state information
- Conference Paper
We consider an orthogonal frequency division multiplexing system employing bit-interleaved coded modulation and pilot aided channel estimation (PACE) at both transmitter and receiver. A low complexity adaptive bit loading scheme in combination with transmit diversity is proposed. The loading procedure minimizes the bit-error rate at the decoder output, and the transmit diversity schemes mitigate channel correlations. Transmit channel state information is obtained by PACE, where a limited feedback channel returns outdated pilot symbols. Since transmit diversity causes the feedback to be outdated more rapidly, we propose a novel transmit channel estimation scheme exploiting the knowledge of the transmit diversity. Show more
Book title2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers
Pages / Article No.
Organisational unit03608 - Wittneben, Armin / Wittneben, Armin
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