反向外環(huán)功率控制的模型及其優(yōu)化算法
The Model of Reverse outer-loop power control and its optimization
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摘要: 該文針對(duì)cdma2000系統(tǒng)的反向鏈路，建立了反向外環(huán)的理論模型，展示了內(nèi)環(huán)與外環(huán)間的緊密聯(lián)系，提出了一種誤幀率的簡化估計(jì)方法，并對(duì)該方法的估計(jì)誤差進(jìn)行了分析，在此模型的基礎(chǔ)上，從減小用戶發(fā)射功率及誤幀率波動(dòng)的目標(biāo)出發(fā)，提出了一種外環(huán)功率控制的算法。該算法可以保證用戶在達(dá)到目標(biāo)誤幀率的同時(shí)，發(fā)射功率最小，從而使系統(tǒng)的性能達(dá)到最優(yōu)，該算法允許系統(tǒng)通過調(diào)整權(quán)系數(shù)以滿足不同的業(yè)務(wù)性能要求，因而有很好的靈活性，仿真結(jié)果驗(yàn)證了所提出模型的正確性和優(yōu)化算法的有效性。
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關(guān)鍵詞:
- 外環(huán)功率控制; 寬帶碼分多址; 移動(dòng)通信; 誤幀率
Abstract: An out-loop power control model for the cdma2000 reverse link is established, and the relationship between the inner-loop and the out-loop is revealed. As a result, a simple estimation method for Frame Error Rate (FER) is proposed and its performance is analyzed. Based on the model, an optimization algorithm for the out-loop power control is proposed which aims to jointly reduce the transmit power and FER variation. It can guarantee target FER while keeps transmit power at, the minimum level, resulting an optimal system performance. The algorithm allows the weighting factors to be adjusted to satisfy different Quality of Service (QoS) requirements, hence provides great flexibility. Finally, computer simulation is performed to show that, the model is appropriate and the optimization algorithm is effective and correct. -
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