A Hybrid ARQ Scheme using Packet Error Prediction on OFDM based HSDPA Systems

Next generation mobile communication services require high throughput and wide bandwidth at high mobile speed. This is made possible with the help of strong channel coding methods such as turbo codes, hybrid ARQ (HARQ) schemes, and channel equalization techniques. But turbo decoding is complex and takes a large part of processing time and power consumption of user equipments (UE). Therefore, the HARQ scheme related to turbo decoding has great effects on the system performance. This paper proposes an enhanced HARQ scheme that can be used in orthogonal frequency division multiplexing (OFDM) based high speed downlink packet access (HSDPA) systems. The proposed scheme uses the threshold which comes from packet error prediction to skip unnecessary turbo decoding process. With the proposed scheme, the power consumption of UE can be reduced, while increasing the performance of the system.