English:
[0002] In wireless communications, transmitted signals are reflected and scattered by obstacles in their path, often resulting in multpiple copies of the signal arriving at the receiver at different times. Depending on the location of the receiving antenna relative to the transmitting antenna, and the obstacles in the signal path, the multiple copies of the signal may combine constructively or destructively at the receiving antenna. In narrow band mobile applications, this phenomenon may cause fluctuations in the signal when the user travels even a small distance. This is often referred to as fast fading. The use of a wide band code division multiple access (CDMA) signal may significantly reduce the impact of fast fading. CDMA is a modulation and multiple access scheme based on spread-spectrum communications which is well known in the art.
[0003] Another technique to mitigate fast fading in mobile applications is to use multiple antennas to increase the gain of the signal due to spatial diversity of the antennas. Currently, there are a number of commercially available mobile devices with dual antenna arrangements. However, these mobile devices employ spatial diversity combining techniques for the received signal only, using a single antenna to transmit. In these mobile devices, it would be advantageous to employ a methodology that uses both antennas to achieve transmit antenna diversity.
[0005] In another aspect of the present invention, a communications apparatus configured to transmit a signal to a remote source includes first and second antennas, an antenna selection module responsive to feedback from the remote source, the feedback being related to the signal transmission, and a transmitter selectively coupled between the first and second antennas under control of the antenna selection module.
[0006] In yet another aspect of the present invention, computer readable media embodying a program of instructions executable by a computer program performs a method of transmitting a signal to a remote source, the method including receiving feedback relating to the signal transmission, selecting between the first antenna and a second antenna as a function of the feedback, and generating a signal to couple a transmitter to the selected antenna.
[0007] In a further aspect of the present invention, a communications apparatus configured to transmit a signal to a remote source includes first and second antennas, means for selecting between the first and second antennas as a function of feedback received from the remote source, the feedback being related to the signal transmission, a transmitter, and means for coupling the transmitter to the selected antenna.
[0008] It is understood that other embodiments of the present invention will become readily apparent to those skilled in the art from the following detailed description, wherein it is shown and described only exemplary embodiments of the invention by way of illustration. As will be realized, the invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.

中文:
[0002]在无线通信中,发射信号被其路径中的障碍物所反射和分散,经常导致该信号的多个复本在不同时间到达接收机。根据接收天线相对于发射天线的位置,以及信号路径中的障碍物,信号的多个复本可在接收天线处积极地或消极地组合。在窄带移动应用中,在用户移动即使一小段距离时这种现象可能会造成信号的波动。通常称之为快衰落。宽带码分多址(CDMA)信号的使用可显著降低快衰落的影响。CDMA是一种在本领域所周知的扩频通信的基础上的调制和多址方案。
[0003]另一种减轻移动应用中快衰落的技术是,使用组合天线来增加信号的增益,由于天线的空间分集。目前,市场上有许多带双重特性天线配置的移动装置。然而,这些移动装置仅将空间分集组合技术用于接收信号,而使用单个天线来发射。在这些移动装置中,利用一种使用两个天线实现发射天线分集的方法会是有益的。
[0005]在本发明的另一个实施方案,一种被配置成将信号发射到远程信号源的通信装置包括:第一和第二天线,一个对来自远程信号源的反馈起反应的天线选择模块,该反馈与信号传输有关,和一个在天线选择模块的控制下在第一和第二天线之间选择性地耦合的发射机。
[0006]在本发明的另一个实施方案,计算机可读介质包含可由计算机程序执行的指令程序,执行一种将信号发射到远程信号源的方法,该方法包括接收与该发射信号有关的反馈,以反馈的函数在第一天线和第二天线之间选择,和生成一个信号将发射机耦合到选择的天线。
[0007]在本发明另一个实施方案,一种被配置成将信号发射给远程信号源的通信装置包括:第一和第二天线,以从远程信号源接收的反馈的函数在第一和第二天线之间进行选择的装置,该反馈与发射信号有关,一个发射机,和用于将发射机耦合到选择天线的装置。
[0008]应能理解,对于本领域的技术人员来说,通过以下详细描述,其中仅通过例子示出及说明本发明的示例性实施方案,本发明的其它实施方案将变得显而易见的。如将认识到的,在不脱离本发明的精神和范围下,本发明可有其它不同的实施方案,本发明一些细节能在其它不同的实施方案中进行修改。因此,附图和详细描述实际上被看作是对本发明的说明而非限制。