| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 96 === Many new communication systems, wireless and wired, were proposed or developed recently. Aiming to provide services to multiple users, the multiple access (MA) scheme adopted by these systems has significant influence upon overall performance. Obviously different environments and requirements may be satisfied by different MA schemes.
Among MA schemes, IDMA (Interleaved Division Multiple Access) and I-OFDMA (Interleaved-Orthogonal Frequency Division Multiple Access, a subclass of OFDMA) have drawn our attention. Our works provide performance evaluation on them respectively for both wired and wireless communications.
In power line environment, channels experienced by users are identical; IDMA provides more frequency diversity and hence has better BER performance than OFDMA. In IEEE 802.11a wireless LAN environment, channels experienced by users are independent, and their conditions are better than that of power line channel; hence OFDMA has better BER performance.
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