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首页> 外文期刊>IEEE Transactions on Communications >Performance comparison of a slotted ALOHA DS/SSMA network and a multichannel narrow-band slotted ALOHA network
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Performance comparison of a slotted ALOHA DS/SSMA network and a multichannel narrow-band slotted ALOHA network

机译：时隙ALOHA DS / SSMA网络和多通道窄带时隙ALOHA网络的性能比较

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摘要

Throughput, delay, and stability for two slotted ALOHA packet radio systems are compared. One system is a slotted direct-sequence spread-spectrum multiple-access (DS/SSMA) network where each user employs a newly chosen random signature sequence for each bit in a transmitted packet. The other system is a multiple-channel slotted narrow-band ALOHA network where each packet is transmitted over a randomly selected channel. Accurate packet success probabilities for the code-division multiple-access (CDMA) system are computed using an improved Gaussian approximation technique which accounts for bit-to-bit error dependencies. Average throughput and delay results are obtained for the multiple-channel slotted ALOHA system and CDMA systems with block error correction. The first exit time (FET) is computed for both systems and used as a measure of the network stability. The CDMA system is shown to have better performance than the multiple-channel ALOHA system in all three areas.
机译：比较了两个时隙ALOHA分组无线系统的吞吐量，延迟和稳定性。一种系统是时隙直接序列扩频多址（DS / SSMA）网络，其中每个用户都为传输的数据包中的每个比特采用新选择的随机签名序列。另一个系统是多信道时隙窄带ALOHA网络，其中每个数据包都是通过随机选择的信道传输的。使用改进的高斯近似技术计算码分多址（CDMA）系统的准确数据包成功概率，该技术考虑了逐位错误的依赖性。对于具有块错误校正的多信道时隙ALOHA系统和CDMA系统，获得了平均吞吐量和延迟结果。对两个系统都计算出第一出口时间（FET），并将其用作网络稳定性的度量。在所有三个方面，CDMA系统显示出比多通道ALOHA系统更好的性能。

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