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Exploiting the source-to-relay channel phase information at the relays can increase the rate upper-bound of distributed orthogonal space-time block codes(STBC)from 2/K to 1/2,where Kis the number of relays.This technique is known as distributed orthogonal space-time block codes with channel phase information(DOSTBC-CPI).However,the decoding delay of existing DOSTBC-CPIs is not optimal.Therefore,based on the rate of 1/2 balanced complex orthogonal design(COD),an algorithm is provided to construct a maximal rate DOSTBC-CPI with only half the decoding delay of existing DOSTBC-CPI.Simulation results show that the proposed method exhibits lower symbol error rate than the existing DOSTBC-CPIs.
Exploiting the source-to-relay channel phase information at the relays can increase the rate upper-bound of distributed orthogonal space-time block codes (STBC) from 2 / K to 1/2, where Kis the number of relays.This technique is known as distributed orthogonal space-time block codes with channel phase information (DOSTBC-CPI). However, the decoding delay of existing DOSTBC-CPIs is not optimal. Beforefore, based on the rate of 1/2 balanced complex orthogonal design (COD) , an algorithm is provided to construct a maximal rate DOSTBC-CPI with only half the decoding delay of existing DOSTBC-CPI. Simulation results show that the proposed method shows lower symbol error rate than the existing DOSTBC-CPIs.