dmrs in two adjacent columns can be located in the middle of the r pdsch zone after being translated thus the dmrs in the middle of the r pdsch zone can ensure demodulation performance of the r pdsch when the rn moves at a low speed or is immobile the cdm t mode is adopted for a demodulation reference signal of an r pdsch there are three ofdm symbols occupied by an r pdcch and the second timeslot and the last ofdm symbols in the first timeslot in the sub frame are occupied by the r pdsch in the present embodiment and as illustrated in fig5 the result of configuring resource units for transmission of the demodulation reference signal of the r pdsch is the same as in the first embodiment and for a specific flow thereof reference can also be made to the first embodiment the cdm t mode is adopted for a demodulation reference signal of an r pdsch there are two ofdm symbols occupied by an r pdcch and the second timeslot and the last two ofdm symbols in the first timeslot in the sub frame are occupied by the r pdsch in the present embodiment the operation s 11 is to firstly search a resource zone occupied by the r pdsch for resource units in an lte system.