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A hybrid ARQ (HARQ) scheme for polar code, which is called active-bitrelocation under masks (ARUM), is proposed. In each transmission, the data bitsare encoded and bit-wisely XOR-masked using a binary vector before beingtransmitted through the channel. The masking process combines multipletransmissions together which forms another step of inter-transmission channeltransform. The reliabilities are updated after every transmission, and the lessreliable bits in earlier ones are relocated to the more reliable positions atthe latest transmitted block. ARUM is a very flexible HARQ scheme which allowseach transmission to have a different mother code length and to adoptindependent rate-matching scheme with sufficient channel state feedback in HARQprocess. Simulation shows that ARUM can obtain near-optimal coding gain.

ARUM: Polar Coded HARQ Scheme based on Incremental Channel Polarization