FIELD: radio engineering, communication.
SUBSTANCE: invention relates to wireless communication. Disclosed are methods and apparatus for determining cyclic shift (CS) values and/or orthogonal cover codes (OCC) for a plurality of demodulation reference signals (DM-RS) transmitted over multiple layers in multiple-input multiple-output (MIMO) communications. A CS index can be received from a base station in downlink control information (DCI) or similar signalling. Based at least in part on the CS index, CS values for the plurality of DM-RS can be determined. In addition, OCC can be explicitly signalled or similarly determined from the CS index and/or a configured CS value received from a higher layer. Furthermore, controlling assignment of CS indices and/or OCC can facilitate providing orthogonality for communication from paired devices in multiuser MIMO.
EFFECT: channel estimation on identical or similar time and frequency resources.
22 cl, 11 dwg
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