Blind Detection With Polar Codes

In blind detection, a set of candidates has to be decoded within a strict time constraint, to identify which transmissions are directed at the user equipment. We propose a blind detection scheme based on polar codes, where the radio network temporary identifier is transmitted instead of some of the frozen bits. A low-complexity decoding phase decodes all candidates, selecting a subset that is decoded by a high-performance algorithm. Simulations results show good missed detection and false alarm rates, that meet the 3GPP LTE-A and future 5G standard specifications. We also propose an early stopping criterion that can reduce the number of operations performed, improving both average latency and energy consumption. The detection speed is analyzed and different system parameter combinations are shown to meet the stringent timing requirements, leading to various implementation trade-offs.