広帯域移動無線通信におけるMIMO多重の周波数領域信号分離技術に関する研究

摘要

In the next generation mobile radio communication systems, high-speed signal transmission, e.g., 100M～1Gbps, is demanded in a limited bandwidth. One of the promising techniques is multi-input multi-output (MIMO) multiplexing. In MIMO multiplexing, different data sequences are transmitted simultaneously from different antennas. At the receiver, a superposition of all transmitted signals is received. It is necessary to separate and detect them. Since the broadband radio channel in the next generation mobile communication systems becomes severely frequency-selective, the accuracy of signal separation significantly degrades. In this paper, we propose iterative frequency-domain interference cancellation (FDIC) for multicode DS-CDMA MIMO multiplexing in a frequency-selective channel. The achievable bit error rate (BER) and throughput performances of iterative FDIC in a frequency-selective fading channel are evaluated by computer simulation.%本論文では，広帯域MIMO多重伝送における信 号分離・判定技術を対象として周波数領域信号処理 の導入を検討し，高精度な信号分離を実現する信号 分離・判定技術「繰り返し周波数領域干渉キャンセル （FDIC）」を提案した．なお，これまで広帯域MIMO多 重伝送の信号分離・判定に周波数領域信号処理を 適用する研究は行われてなかった．受信信号にFFTを適用して多数の直交周波数成分に分解し，各周 波数で狭帯域MIMO多重伝送用の信号分離・判定 技術を単に適用するだけでは，IPI及びIAIの低減 が不十分であり，残留IAI及び残留IPIの影響によ って信号分離精度が大幅に劣化してしまう．