WCDMA系統(tǒng)上行鏈路空時干擾抑制技術(shù)
The space-temporal interference cancellation technology for the uplink of wcdma system
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摘要: 該文提出一種將自適應(yīng)并行干擾對消技術(shù)簡化為利用軟判決變量在一個比特周期內(nèi)的平均作為再生信號幅度估計的并行干擾對消方法,這種簡化大大降低了原方法的運算量,而且具有很好的穩(wěn)定性。仿真實驗表明在單陣元接收情況下,簡化方法的對消效果較原方法有些下降,但在陣列接收然后進行并行干擾對消的情況下,二者的性能基本沒有差別。因而該文針對WCDMA系統(tǒng)上行鏈路的幀結(jié)構(gòu)特征,進一步提出了導(dǎo)頻位輔助LMS-DRMTA算法加上軟判決變量平均幅度估計法的空時聯(lián)合WCDMA系統(tǒng)的干擾對消方案。
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關(guān)鍵詞:
- 并行干擾對消; 軟判決; WCDMA; 上行鏈路; 智能天線; 導(dǎo)頻位
Abstract: This paper simplifies the adaptive parallel interference cancellation (PIC) scheme into a ne method named soft-decision variant averaging amplitude estimation PIC technology. Relative to the adaptive PIC, the new method cuts down large amount of computational complexity, furthermore, it has better robustness than the adaptive PIC method. The simulations indicate that when a single sensor is used at the base station, the new method performs worse than the adaptive PIC method, especially under near far conditions. However, when an antenna array is used at the base station, and the array output is fed into PIC processing, the two PIC methods perform almost the same. Therefore, accounting to the frame structure of WCDMA, a space-temporal interference cancellation scheme including pilot-bits assisted LMS-DRMTA algorithm and soft-decision averaging amplitude estimation PIC is proposed for the uplink of WCDMA system. The overall scheme is characterized by low complexity and strong robustness. -
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