擴頻ALOHA多址系統(tǒng)吞吐量和時延性能分析
Performance Analysis of Throughput and Delay for Spread Spectrum ALOHA Multiple Access Systems
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摘要: 該文深入地研究了擴頻ALOHA多址(SAMA)系統(tǒng)的信道接入性能，推導了通用的擴頻ALOHA多址系統(tǒng)平均誤比特率公式，給出了擴頻ALOHA系統(tǒng)吞吐量和時延性能表達式，同時還分析了信道編碼對系統(tǒng)性能的改進，給出了相應的仿真和數值結果。結論表明，擴頻ALOHA多址系統(tǒng)可以顯著提高傳統(tǒng)ALOHA系統(tǒng)的吞吐量和時延性能，提高程度隨擴頻增益增加而增加，引入信道編碼可以進一步提高網絡性能。
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關鍵詞:
- 擴頻;ALOHA;吞吐量;傳輸時延
Abstract: In this paper, the performance of Spread spectrum ALOHA Multiple Access (SAMA) system is deeply studied. The general formula of average bit-error-rate for SAMA system is derived, and the expression for calculating throughput and delay of transmission in SAMA system is also presented, and moreover, the performance improvement in throughput and delay when using forward-error-control technique is analyzed. Numerical results show that a significant performance improvement can be gained by using spread spectrum ALOHA other than conventional ALOHA system, and the improvement will be increased with the increasing of processing gain. Consequently, SAMA is very suitable for applications in distributed packet radio networks. -
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