在這個計畫中，我們對於以多載波直接序列分碼多重進接(MC DS-CDMA)為基礎的多個使用者下鏈傳送端通訊系統，提出一種即時的位元、子載波、功率和展頻因子的配置演算法。假設基地台已知全部使用者的所有子載波增益，提出的下載演算法(loading algorithm)為最小化所需的傳送功率，且必須滿足每位使用者所需的傳送速率和資料錯誤率的限制。在這新的演算法中，結合動態位元分配演算法(DBA)和展頻因子參數的調適，來決定位元、子載波、功率和展頻因子的配置。所提出的方法在傳送功率方面比[7]和[9]提供了更好的效能，而其也顯示在模擬結果中。 In this paper, we propose a real-time bit, subcarrier, power, and spreading factor allocation algorithm for MC DS-CDMA communication system in forward link transmission. Assuming that base stations know the channel gain of all subcarriers of all users, the proposed loading algorithm tries to minimize the required transmit power while satisfying the rate requirement and data error rate constraint of each other. The novel algorithm determines bit, subcarrier, power, and spreading factor allocation simultaneously by the combination of DBA algorithm and spreading factor parameter. The proposed scheme offers better performance in the terms of transmit power than [7][9], as demonstrated in the simulation results.
