APPARATUS AND METHOD FOR PERFORMANCE ENHANCEMENT IN OPEN LOOP MULTI CELL MIMO SYSTEM

摘要

PURPOSE: A device for increasing performance in an open loop multi cell MIMO(Multiple Input Multiple Output) system and a method thereof are provided to increase performance by PMI(Precoding Matrix Index) cycling or PMI repetition. CONSTITUTION: A controller(522) transmits the identifiers of a base station or a temporary base station to a serving base station wherein the base station has larger average power than a specific value. The controller receives information of a base station related to generated joint processing using a bitmap or a base station identifier. The controller feeds a transmission coherence matrix or a main eigen vector of a related base station back to the serving base station. The controller corresponds to the main eigen vector and receives a bitmap showing a PMI and a parameter showing a PMI cycle mode. The controller determines the PMI cycle mode according to the parameter.