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Author López-Valcarce, Roberto
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Staggered Modulation Format ♦ Channel Equalization ♦ Perfect Zero-forcing Equalization ♦ Relative Time Offset ♦ Zero-forcing Equalization ♦ Necessary Condition ♦ Modulation Format ♦ Lti Filter ♦ Corresponding Non-staggered Signal ♦ Fir Filter ♦ Received Signal ♦ Time-varying Filter ♦ Mmse Le ♦ Quadrature Component ♦ Channel Equalization Problem ♦ Baud Rate ♦ Mmse Linear Equalizer ♦ Periodic Switch
Abstract The channel equalization problem for staggered (or offset) modulation formats is considered. It is shown that due to the relative time offset of the in-phase and quadrature components, the received signal must be sampled at twice the baud rate of the corresponding non-staggered signal. This suggests that perfect zero-forcing equalization may be achievable as in standard fractionally sampled systems. To explore this feature, the MMSE linear equalizer (LE), which turns out to be a periodically time-varying filter, is obtained. It is shown that the MMSE LE can be implemented with an LTI filter and a set of periodic switches and modulators. Using this, necessary conditions for zero-forcing equalization with FIR filters are derived.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Publisher Department Roberto Opez-Valcarce Dept