Patent ID: 8031801
Filing Date: 2011-10-04
Classification: H04B,H04L

Abstract:
1. A method of controlling a signal transmission in a Multiple Input Multiple Output (MIMO) communication system, comprising: P transmitting antennas from M transmitting antennas by comparing a channel quality based on channel quality information with a specific threshold, wherein a transmitting antenna corresponding to the channel quality of which is smaller than the specific threshold is excluded in a transmission, and P is a natural number less than M; determining a modulation and coding set to be allocated to each of the P transmitting antennas; first demultiplexing a data stream into first P sub-streams corresponding to the P transmitting antennas; coding and mapping the first P sub-streams to form P sets of symbols by using the modulation and coding set determined per each antenna; second demultiplexing the P sets of symbols per each sub-stream; spreading the P sets of demultiplexed symbols using spreading codes which are individually determined per each sub-stream; combining the demultiplexed spread symbols per each sub-stream to form second P sub-streams; scrambling the second P sub-streams with scrambling codes; and transmitting the scrambled second P sub-streams at the transmitting end via the P transmitting antennas.