Patent ID: 7751352

Claim:
A method of communication in a Multiple Input Multiple Output (MIMO) system, comprising: transmitting by a base station, independent parallel downlink control signals including control information for each data stream; and transmitting the data streams, wherein a modulation and coding set (MCS) is independently applied per antenna for the data streams, according to the MCS being defined for each antenna based on feedback information from a mobile terminal, wherein the feedback information from the mobile terminal includes channel quality information indicating channel states of each antenna, wherein each of the independent parallel downlink control signals includes a User Equipment identifier (UE ID), wherein each data stream is multiplied with different weight values, wherein the different weight values are used to discriminate each control signal and a Successive Interference Cancellation (SIC) method is used to remove an influence of a first data stream by the mobile terminal; wherein the control information corresponds to at least one from a modulation method used to modulate the data streams, a number of OVSF (Orthogonal Variable Spread Factor) codes used to spread the data streams, and a re-transmission scheme used to request retransmission of at least one of the data streams, wherein for the modulation method, the number of OVSF codes, and the retransmission scheme are set differently using a Per Antenna Rate Control (PARC) method, wherein the different OVSF codes are used to discriminate each control signal so as to provide a backward compatibility with the mobile terminal configured for a High Speed Downlink Packet Access (HSDPA) using a single antenna; wherein the different OVSF codes or weight values are used to discriminate each control signal by applying a Per Stream Rate Control (PSRC) method; wherein if a number “C” of control signals to be transmitted is less than a number “M” of multiple transmitting antennas of the MIMO system, the control signals are transmitted via a “C” number of transmitting antennas selected from the “M” number of multiple transmitting antennas, and wherein a number of the independent parallel downlink control signals equals a number of the data streams such that a ratio of the data streams to the independent parallel downlink control signals is 1:1.