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題名 | Adaptive Beamforming for Co-Channel Mobile Communication Signals in a Multipath Environment=用於行動通訊的多路徑同頻信號環境下之可適性波速形成法則 |
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作者 | 柳茂林; Leou, Maw-lin; |
期刊 | 中華工商專校學報 |
出版日期 | 19970300 |
卷期 | 14 1997.03[民86.03] |
頁次 | 頁20-47 |
分類號 | 448.84 |
語文 | eng |
關鍵詞 | 行動通訊; 同頻信號; 波速; |
中文摘要 | 在未來的通訊下,行動電話的使用者會不斷的增加,同頻信號的干擾會愈大,可 利用天線陣列來減少這些干擾,此外在某些系統下,多路徑的延遲信號可能大到會干擾我們 想要的信號, 傳統的方法在原先的天線陣列後面加上等化器來解決訊符間干擾( ISI )。 如此做法可使系統容量增加好幾倍,不過當多路徑的干擾信號出現在天線陣列的主波束中時 ,上述的傳統方法會因而減低他的效能,在本篇論文中我們提出一種使用於行動通訊下之可 適性精確波束法則,我們結合空間與時間的濾波方式來改善傳統方法的效能,它可得到一組 比傳統方法精確的訓練信號,因此我們的可適性精確法則能較傳統方法有較低的位元錯誤率 ( bit error rate )和較高信雜比( SNR ratio )並由模擬的結果可以得到印證。 |
英文摘要 | The number of user of mobile telephones is increasing on future communication. An adaptive array has already been implemented to reduce the unavoidable co-channel interference. But for some commercial cellular system, multipath delays are significant enough to disturb the desired signal. Conventional method used and equalizer behind the array to solve this problem. An adaptive array with equalizer system can increase system capacity several fold. When multipath fading of desired signal appeared at mainbeam of antenna array, performance of conventional array method was degraded. This paper we proposed an accurate adaptive beamforming system for mobile communication. This method improved the performance by a combination of temporal and spatial filtering. It resulted in a more accurate training signal than that obtained by the conventional method. For this reason, our accurate adaptive beamforming method could achieve low bit error rate and high signal to noise ratio than conventional method could achieve. Simulation results were presented to support our claims. |
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