A Turbo Partial PIC/MMSE Multicarrier Detection and Decoding Scheme for Convolutional Coded OFDM Systems
碩士 === 國立臺北科技大學 === 電腦通訊與控制研究所 === 92 === Intercarrier interference (ICI) due to the loss of subcarriers orthogonality over the multiple paths and time-varying channel is a severe problem for orthogonal fre-quency-division multiplexing (OFDM) systems. Recently, it has been shown that the received si...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2004
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| Online Access: | http://ndltd.ncl.edu.tw/handle/76940653791334883986 |
| Summary: | 碩士 === 國立臺北科技大學 === 電腦通訊與控制研究所 === 92 === Intercarrier interference (ICI) due to the loss of subcarriers orthogonality over the multiple paths and time-varying channel is a severe problem for orthogonal fre-quency-division multiplexing (OFDM) systems. Recently, it has been shown that the received signal in the OFDM systems can be viewed as the synchronous code-division multiple access (SCDMA) signal in receiver after some mathematical manipulation, and the ICI term in the OFDM system is equivalent to the multiple access interference (MAI) term in SCDMA system. They proposed a successive interference cancellation multicar-rier detector and it performs better than conventional single-carrier detection schemes. To further improve the performance of OFDM systems in the presence of ICI, we pro-pose to use a soft-in soft-out (SISO) multicarrier detector and a SISO convolutional de-coder in an iterative (turbo) way. The simulation results show that the first iteration of the proposed scheme demonstrates 2-3 dB gain compared to the previous multicarrier detection schemes. The second and third iterations improve the performance further.
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