Turbo Decoder with early stopping criteria

The turbo code used in the 3GPP Long Term Evolution(LTE) standard have been chosen specifically to simplify parallel turbo decoding and thus achieving higher throughputs. The higher data rates however leads to an increased computational complexity and thus a higher power and energy consumption of the decoder. This report presents a turbo decoder for the LTE standard with a stopping crite- ria aimed to reduce the power and energy consumption of the turbo decoder. The decoder can be configured to use 1,2 ,4 ,8 or 16 MAP decoders in parallel achiev- ing a throughput of 110 Mb/s for 7 iterations when running at a clock frequency of 200 MHz. The decoder were synthesised with 65 nm low power libraries with an area of 1.6 mm 2 . The post-synthesis simulations shows that the stopping cri- teria can lead to a significant lower energy consumption with no performance loss.The cellular market are constantly growing with more users every day. Today the smart- phone and tablet are common commodities which are able to both stream music as well as high definition video. The increasing amount of user in combination with the increasing data rate requirements puts high demands on the mobile operators networks. However the frequency spectrum is crowded with dif- ferent competing technologies and thus the available bandwidth are scarce. Ensuring a reliable communication and efficient use of the available resources are thus vital