次世代無線通訊系統(LTE-A)中，傳收發端會配置多根天線(Multiple Input Multiple Output, MIMO)或是使用載波聚合(Carrier Aggregation, CA)來提高資料的傳送速度，這兩種技術的共通點就是多根天線，然而在多天線的系統中會降低系統效能的原因有可能是使用者的使用行為或是天線設計問題等等，若此現象發生我們稱之為天線間的接收功率不匹配(Received Power Imbalance, RPI)，若對此現象置之不理則會造成系統的效能以非線性的速度降低，因此本論文分別在CA系統以及MIMO OFDM系統中使用疊代演算法來降低RPI對系統的影響。根據本論文的模擬結果可以發現使用疊代演算法的接收器能有效降低RPI效應。 For next generation wireless communication like Long Term Evolution-Advanced (LTE-A), in order to increase data rate the transmitter and receiver may equip multiple antennas or the system aggregates many component carriers to approach high data rate. Multiple antennas is a common characteristic between CA and MIMO system, however the received power imbalance (RPI) may cause by design flaw, operator’s negligence etc. If the system does not consider RPI effect, the system will be degradation non-linearly. Consequently in this thesis we will use iterative algorithm to mitigate RPI effect in CA system and MIMO OFDM system respectively. Based on simulation result we can find the iterative receiver can alleviate RPI effect greatly.
