基于選擇性分集技術(shù)的無線中繼系統(tǒng)性能
Performance of Wireless Relaying System Based on Selection Diversity Techniques
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摘要: 采用中繼傳輸能夠抵抗無線信道的多徑衰落，克服陰影效應(yīng)，從而增強通信質(zhì)量，提高頻譜效率。該文首先給出了兩跳中繼系統(tǒng)模型，針對非再生及再生兩類中繼方式，簡要介紹了采用非分集接收及最大比合并時的鏈路性能?？紤]到接收機復(fù)雜度和系統(tǒng)實現(xiàn)的性能代價比，該文引入了處理相對簡單但又具備分集優(yōu)勢的選擇性合并方式，并根據(jù)中繼節(jié)點不同的位置分布，分析了兩類中繼方式下系統(tǒng)的通信中斷概率和誤碼率。數(shù)值結(jié)果表明，非再生中繼傳輸具有較好的性能，同時中繼系統(tǒng)若采用選擇性分集接收，則既能降低收端復(fù)雜度，又能獲得較大的性能增益。
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關(guān)鍵詞:
- 中繼傳輸;非再生;再生;分集
Abstract: Cooperative relaying can combat multi-path fading and shadowing effect in wireless networks to enhance communication quality and bandwidth efficiency. A two-hop relaying system model is provided in this paper, and the analytical evaluations of non-regenerative and regenerative relaying system with non-diversity or maximal ratio combining are introduced. Considering the complexity and cost-effectiveness of the receiver, this paper investigates the performance of the selection diversity in terms of probability of outage and error with different positions of relays. The numerical results show that non-regenerative relaying system outperforms the others, and selection diversity is a cost-effective method to improve system performance. -
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