一種自適應(yīng)直擴(kuò)超寬帶(DS-UWB)接收機(jī)在高速無(wú)線室內(nèi) 傳輸環(huán)境中的性能
Performance of an Adaptive DS-UWB Receiver in High-Speed Wireless Indoor Transmission Environments
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摘要: 該文提出了一種基于可變長(zhǎng)訓(xùn)練序列的自適應(yīng)直擴(kuò)超寬帶(DS-UWB)接收機(jī)。該接收機(jī)充分利用自適應(yīng)NLMS算法在收斂性、復(fù)雜度及穩(wěn)定性方面的綜合優(yōu)勢(shì)，以較小的訓(xùn)練開(kāi)銷(xiāo)實(shí)現(xiàn)了自適應(yīng)接收機(jī)的功能。理論分析及計(jì)算機(jī)仿真實(shí)驗(yàn)表明，在誤碼性能相當(dāng)?shù)那疤嵯拢岢龅淖赃m應(yīng)接收機(jī)比傳統(tǒng)的Rake接收機(jī)具有更為簡(jiǎn)單的結(jié)構(gòu)，同時(shí)與現(xiàn)有的自適應(yīng)接收機(jī)相比，其訓(xùn)練序列的開(kāi)銷(xiāo)可節(jié)省60%以上，因而適用于低功率、低成本以及簡(jiǎn)易實(shí)用的室內(nèi)超寬帶應(yīng)用場(chǎng)合。
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關(guān)鍵詞:
- 無(wú)線通信;超寬帶(UWB);密集多徑;自適應(yīng)
Abstract: An adaptive receiver scheme employing the training sequences of flexible length is proposed for DS-UWB systems. By fully exploiting the NLMS algorithms robust behavior on convergence rate, complexity and stability, the proposed scheme is capable of performing an adaptive receiver with its low cost in terms of training bits. Theoretical analysis and simulation results show that, without loss of the BER performance, the proposed scheme can achieve a simpler structure compared with the traditional coherent Rake receiver and a higher throughput compared with the conventional adaptive receiver scheme, and therefore can be considered as a promising candidate for low cost, low power consumption and low complexity indoor UWB application scenarios. -
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