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A trellis-coded CDMA system based on orthogonal plane sequence modulation.

机译：基于正交平面序列调制的网格编码CDMA系统。

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摘要

A novel trellis-coded-modulation scheme, named as orthogonal plane sequence modulation (OPSM), is introduced whose signal space defines over L (L ≥ 2) orthogonal planes. Its geometric uniformity and binary isometric labeling is verified. Both quasi-synchronous trellis-coded CDMA (QS-TC-CDMA) system and asynchronous trellis-coded CDMA (A-TC-CDMA) system, which are based on OPSM, are presented, respectively, and their theoretical upper bounds are derived under an AWGN channel plus multi-user interference. The average degradation due to multi-user interference is calculated based on the Gaussian quadrature rules (GQR). Gold sequences are utilized as a pseudo-random sequence and Ungerboeck's systematic convolutional encoders with feedback are employed for the trellis-code implementation. Due to the OPSM's multi-planar signal space expansion, a QS-TC-CDMA system based on OPSM improves the system performance over conventional QS-TC-CDMA systems based two-dimensional signaling, and even over conventional multicode QS-TC-CDMA systems that have the same number of sequences per user. An A-TC-CDMA system based on OPSM has better cross-correlation characteristics over conventional biorthogonal signaling based A-TC-CDMA systems, especially at high data rates, so that at practical error rates the proposed scheme has a superior gain to biorthogonal signaling schemes. Furthermore, compared to standard convolutionally-coded CDMA systems, the proposed TC-CDMA system is superior under the same delay conditions (quasi-synchronous or asynchronous), same processing gain, and same decoder complexity. We also simulate the proposed system under a Rician fading channel, which shows that the system performance gain of TC-CDMA system based on OPSM is more pronounced over conventional TC-CDMA systems. OPSM provides several constellation options for a certain data rate so that the proposed system is highly adaptable to dynamic channel conditions and allows a flexible system design. Additionally, for biorthogonal A-TC-CDMA systems, by the transfer function approach, we obtain uniformly tight error-probability upper bounds compared to the previously published approaches.
机译：介绍了一种新颖的网格编码调制方案，称为正交平面序列调制（OPSM），其信号空间在 L （ L ≥2）正交平面上定义。验证了其几何均匀性和二元等距标记。分别介绍了基于OPSM的准同步网格编码CDMA（QS-TC-CDMA）系统和异步网格编码CDMA（A-TC-CDMA）系统，并在此基础上推导了它们的理论上限。 AWGN频道加上多用户干扰。基于高斯正交规则（GQR）计算由于多用户干扰导致的平均降级。黄金序列被用作伪随机序列，而带格反馈的Ungerboeck系统卷积编码器被用于网格代码实现。由于OPSM的多平面信号空间扩展，基于OPSM的QS-TC-CDMA系统相对于基于二维信令的传统QS-TC-CDMA系统甚至是传统的多码QS-TC-CDMA系统，其系统性能得到了改善。每个用户具有相同数量的序列。与传统的基于双正交信号的A-TC-CDMA系统相比，基于OPSM的A-TC-CDMA系统具有更好的互相关特性，尤其是在高数据速率下，因此，在实际错误率下，该方案比双正交信号具有更高的增益。计划。此外，与标准的卷积编码的CDMA系统相比，所提出的TC-CDMA系统在相同的延迟条件（准同步或异步），相同的处理增益和相同的解码器复杂度下具有优越性。我们还模拟了在Rician衰落信道下提出的系统，这表明基于OPSM的TC-CDMA系统的系统性能增益比传统的TC-CDMA系统更为明显。 OPSM为一定的数据速率提供了几种星座选择，因此，所提出的系统高度适应动态信道条件，并允许灵活的系统设计。此外，对于双正交A-TC-CDMA系统，通过传递函数方法，与以前发布的方法相比，我们获得了一致的严格的错误概率上限。

著录项

  • 作者

    Choe, Sangho.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 115 p.
  • 总页数 115
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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