Adaptive transmit antenna

1998 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.98EX184) Pub Date : 1900-01-01 DOI:10.1109/APWC.1998.730638

R. Dybdal, S. J. Curry

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引用次数: 3

Abstract

Adaptive techniques are commonly used to protect receiving antennas from interference. However, adaptive techniques have not been applied to transmitting antennas. An example of adaptively controlling a transmitting antenna is described. This adaptive transmit antenna concept was motivated by requirements for future personal communication systems. These antennas require broad antenna coverage to avoid antenna pointing requirements. This broad-coverage antenna requirement unavoidably results in multipath susceptibility that degrades communication performance. Rake receivers provide adaptive equalization and adaptive antenna element combining are well-known techniques to reduce multipath degradation for receiving systems. However, the performance of the transmit antenna remains degraded by multipath signals. Since the receive and transmit frequencies are separated, the adaptive receive combinations differ from those needed in the transmit case. This new adaptive transmit antenna provides a means to reduce multipath interference in the transmit case. Multipath distortions on transmission reduce the isolation between multiple users in CDMA systems, which is a well-known limit on overall system capacity.

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自适应发射天线

自适应技术通常用于保护接收天线免受干扰。然而，自适应技术尚未应用于发射天线。给出了一个自适应控制发射天线的实例。这种自适应发射天线的概念是由未来个人通信系统的需求所激发的。这些天线需要广泛的天线覆盖，以避免天线指向要求。这种对天线的广泛覆盖要求不可避免地导致了多径敏感性，从而降低了通信性能。Rake接收机提供自适应均衡和自适应天线单元组合是众所周知的减少接收系统多径退化的技术。然而，发射天线的性能仍然受到多径信号的影响。由于接收和发射频率是分离的，因此自适应接收组合与发射情况下所需的组合不同。这种新型自适应发射天线提供了一种减少发射箱中多径干扰的方法。传输中的多径失真降低了CDMA系统中多个用户之间的隔离度，这是一个众所周知的限制系统整体容量的问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1998 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.98EX184)

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