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| 題 名 | Performance of Direct-Sequence and Slow Frequency Hopped Spread Spectrum for Wireless Local Communications=直接序列與慢跳頻於無線區域通訊之效能 |
|---|---|
| 作 者 | 吳宗承; 陳光禎; 趙啟超; | 書刊名 | Journal of the Chinese Institute of Electrical Engineering |
| 卷 期 | 2:4 1995.11[民84.11] |
| 頁 次 | 頁285-297 |
| 分類號 | 448.5 |
| 關鍵詞 | 展頻通訊; 直接序列; 慢跳頻; 多重路徑衰褪通道; 多樣技術; Spread spectrum; Direct sequence; Slow frequency hopping; Multipath fading; Diversity; |
| 語 文 | 英文(English) |
| 中文摘要 | 本文分析在室內多重路徑衰褪通道direct-sequence(DS)以RAKE接收器及slow frequency hopped (SFH) 以多樣技術 (diversity) 接收器的錯誤率。 DS 系統用 BPSK 調 變、等增益 (equal-gain) 及選擇性 (selection) 的結合 (combining) 多樣技術。SFH 系 統則用 BFSH 調變,等增益及選擇性的結合多樣技術。亦考慮應用一個或兩個錯誤可更正的 BCH 碼以增進效能。 我們使用一群一群 (cluster) 到達的路徑 (path) 表示多重路徑衰褪 通道以符合實際室內環境。 從數據結果觀察得知在低位元傳輸速率時 SFH 與 DS 差不多。 而在高位元傳輸速率時,DS 較 SFH 有較好效能。此外編碼與多樣技術確能改進效能。此項 效能分析能提供未來設計無線個人通訊的方向。 |
| 英文摘要 | Bit error probabilities of direct-sequence (DS) systems with RAKE receivers and slow frequency hopped (SFH) systems with diversity receptions in indoor multipath fading channels are analyzed. Equal-gain and selective combinings for DS systems with binary phaseshift keying (BPSK) modulation and SFH systems with binary frequency-shift keying (BFSK) modulation are considered. BCH codes with single or double error-correcting capability are chosen to further improve the performance of DS and SFH systems. Multipath fading channel models with clusters of arriving rays are used to meet the practical indoor environments. From the numerical results, we observe that the SFH system is competitive under moderate data rates. For higher data rates, the DS system has better performance than that of the SFH system. We demonstrate that coding and diversity techniques can improve the performance of DS and SFH systems. This research highlights the direction toward designing the spread spectrum multiple access (SSMA) receivers for wireless personal communications. |
本系統中英文摘要資訊取自各篇刊載內容。