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High Speed Packet Access (HSPA), the latest evolution of the Wideband Code Division Multiple Access (WCDMA) standard, provides higher uplink data rates using higher-order modulation (16-QAM) and multicode transmission. Equalization is needed when the channel is dispersive. Despite gains from linear equalization, there is room for further improvement. In this paper, the authors consider two enhancements: block equalization with joint detection and a generalization of arbitration. Block equalization with joint detection, originally developed for non-spread systems, involves jointly detecting symbols from multiple symbol periods and using a feedback filter to remove interference from past symbol periods.
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