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Error-rate analysis for multirate DS-CDMA transmission schemes

机译：多速率DS-CDMA传输方案的误码率分析

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摘要

We analyze and compare the error performance of a dual-rate direct-sequence code-division multiple-access (DS-CDMA) system using multicode (MCD) and variable-spreading gain (VSG) transmission in the uplink. Specifically, we present two sets of results. First, we consider an ideal additive white Gaussian noise channel. We show that the bit-error rate (BER) of VSG users is slightly lower than that of MCD users if the number of low-rate interferers is smaller than a specific threshold. Otherwise, they exhibit similar error performance. Second, we look at multipath fading channels. We show that with diversity RAKE reception, the VSG user suffers from a larger interference power than the MCD user if the channel delay spread is small. The reverse is true for a large delay spread. However, a larger interference power in this case does not necessarily lead to higher error probability. Essentially, our results for both cases show that: 1) in addition to the signal-to-interference ratio (SIR), the difference in error performance between the two systems strongly depends on the distributions of multiple-access and multipath interference; 2) for practical cellular communications, performances for both systems are expected to be similar most of the time.
机译：我们分析并比较在上行链路中使用多码（MCD）和可变扩频增益（VSG）传输的双速率直序列码分多址（DS-CDMA）系统的错误性能。具体来说，我们提出了两组结果。首先，我们考虑理想的加性高斯白噪声通道。我们显示，如果低速率干扰源的数量小于特定阈值，则VSG用户的误码率（BER）略低于MCD用户。否则，它们会表现出相似的错误性能。其次，我们来看多径衰落信道。我们表明，对于分集RAKE接收，如果信道延迟扩展很小，则VSG用户将比MCD用户遭受更大的干扰功率。对于较大的延迟扩展，情况则相反。但是，在这种情况下，较大的干扰功率不一定会导致较高的错误概率。从本质上讲，我们针对这两种情况的结果表明：1）除了信噪比（SIR）之外，两个系统之间的差错性能差异还强烈取决于多址和多径干扰的分布； 2）对于实际的蜂窝通信，预计大多数时候两个系统的性能都相似。

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