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An adaptive Reduced State Maximum A Posteriori (RS-MAP) equalizer based on Per-Survivor Processing (PSP) in conjunction with a local Decision Feedback Equalizer (DFE) for the EDGE system with 8PSK modulation is proposed in this paper. A pre-filter prior to the MAP-PSP is exploited to reshape the Channel Impulse Response (CIR) to have approximately a minimum phase property. A trade-off between the performance and complexity can be achieved by using the DFE. The simulations show that the RS-MAP-PSP can improve the performance of the EDGE system, especially for the high coding rate traffic and/or under the high speed environments.
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