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A selective hybrid automatic repeat request (HARQ) scheme operating based on channel conditions for high speed packet data transmission systems is presented. This scheme exploits the channel condition identified by the channel quality indicator (CQI) to determine whether the retransmitted packet is directly decoded without soft combining or it is soft combined with the original packet and decoded...
High speed downlink packet access (HSDPA) is devised to enable the current 3G system to accommodate more data throughput for mobile users. The three main features of the HSDPA system are the adaptive modulation and coding (AMC), the hybrid automatic repeat request (HARQ) and the fast scheduling. It would be possible to obtain the downlink speed of up to 14Mbps in HSDPA using these three features....
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