Method and apparatus for generating a dedicated reference signal
A method for generating a Dedicated Reference Signal (DRS) is provided, which includes generating a Reference Signal (RS) sequence of each antenna port, spreading each RS sequence and obtaining an spread RS sequence, multiplying each spread RS sequence by a predefined scrambling code and obtaining a desired DRS sequence. An apparatus for generating a DRS is also provided. The problem of the imbalance of the power of OFDM symbols is cured, and DRS interference between different cells can be randomized.
1. A method for generating a Dedicated Reference Signal (DRS) sequence in a radio communication system, comprising:
allocating at least one Physical Resource Block (PRB) for a User Equipment (UE);
generating an initial Reference Signal (RS) sequence using an initialization value based on a Cell Identifier (ID):
obtaining the DRS sequence for the UE from the initial RS sequence based on an index of the at least one PRB allocated to the UE; and
mapping the DRS sequence for the UE onto a plurality of Resource Elements (REs) based on a DRS port;
wherein the plurality of REs comprises three RE sets in one PRB, each RE set includes two consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain and one subcarrier in a frequency domain, one RE set is adapted to be mapped to at least two DRS ports, and the at least two DRS ports are differentiated in the RE set by applying different codes.
2. The method of claim 1 , wherein a pseudo random sequence generator of the initial RS sequence is initialized by the Cell ID while a UE ID is excluded.
3. The method of claim 1 , wherein the initial RS sequence is intercepted according to the index of the at least one PRB allocated to the UE to obtain DRS sequence segments, and the DRS sequence segments are combined according to the indexes of the PRBs allocated to the UE to obtain the DRS sequence.
4. The method of claim 3 , wherein the DRS sequence segments related to one PRB index include continuous elements of the initial RS sequence.
5. The method of claim 3 , wherein the DRS sequence segments related to one PRB index include discontinuous elements of the initial RS sequence.
6. The method of claim 1 , wherein the index of the at least one PRB is allocated to the UE in a slot.