Antenna diversity (original) (raw)
Antennendiversität (englisch antenna diversity) bezeichnet in der Funktechnik die Verwendung mehrerer Antennen pro Sender oder Empfänger. Mit der erzielten Diversität können störende Interferenzen reduziert werden. Dies ist besonders bei mobilen Funkanwendungen sinnvoll. Es wird zwischen der , bei der die Antennen teils weit mehr als hundert Meter und mehr als einige 100 Wellenlängen auseinander liegen, und der , bei der die Antennen im Bereich einer oder einiger weniger Wellenlängen angeordnet sind, unterschieden.
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| dbo:abstract | Antenna diversity, also known as space diversity or spatial diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a wireless link. Often, especially in urban and indoor environments, there is no clear line-of-sight (LOS) between transmitter and receiver. Instead the signal is reflected along multiple paths before finally being received. Each of these bounces can introduce phase shifts, time delays, attenuations, and distortions that can destructively interfere with one another at the aperture of the receiving antenna. Antenna diversity is especially effective at mitigating these multipath situations. This is because multiple antennas offer a receiver several observations of the same signal. Each antenna will experience a different interference environment. Thus, if one antenna is experiencing a deep fade, it is likely that another has a sufficient signal. Collectively such a system can provide a robust link. While this is primarily seen in receiving systems (diversity reception), the analog has also proven valuable for transmitting systems (transmit diversity) as well. Inherently an antenna diversity scheme requires additional hardware and integration versus a single antenna system but due to the commonality of the signal paths a fair amount of circuitry can be shared. Also with the multiple signals there is a greater processing demand placed on the receiver, which can lead to tighter design requirements. Typically, however, signal reliability is paramount and using multiple antennas is an effective way to decrease the number of drop-outs and lost connections. (en) Antennendiversität (englisch antenna diversity) bezeichnet in der Funktechnik die Verwendung mehrerer Antennen pro Sender oder Empfänger. Mit der erzielten Diversität können störende Interferenzen reduziert werden. Dies ist besonders bei mobilen Funkanwendungen sinnvoll. Es wird zwischen der , bei der die Antennen teils weit mehr als hundert Meter und mehr als einige 100 Wellenlängen auseinander liegen, und der , bei der die Antennen im Bereich einer oder einiger weniger Wellenlängen angeordnet sind, unterschieden. (de) 空间分集（英語：space diversity）也叫天线分集（英語：antenna diversity），是一种在发射端或（和）接收端安装多根不同位置的天线的分集技术。若这些天线的距离足够大，则电磁波受到衰落的影响就相互独立。 一个详细的空间分集的分集改善系数计算公式： 其中 为站距（km）， 为无分集时衰落深度（dB）， 为工作频率（GHz），， 和 为两个空间分集天线的增益（dB）， 为衰落因子， 为分集接收天线间的垂直距离（m）。 (zh) |
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| rdfs:comment | Antennendiversität (englisch antenna diversity) bezeichnet in der Funktechnik die Verwendung mehrerer Antennen pro Sender oder Empfänger. Mit der erzielten Diversität können störende Interferenzen reduziert werden. Dies ist besonders bei mobilen Funkanwendungen sinnvoll. Es wird zwischen der , bei der die Antennen teils weit mehr als hundert Meter und mehr als einige 100 Wellenlängen auseinander liegen, und der , bei der die Antennen im Bereich einer oder einiger weniger Wellenlängen angeordnet sind, unterschieden. (de) 空间分集（英語：space diversity）也叫天线分集（英語：antenna diversity），是一种在发射端或（和）接收端安装多根不同位置的天线的分集技术。若这些天线的距离足够大，则电磁波受到衰落的影响就相互独立。 一个详细的空间分集的分集改善系数计算公式： 其中 为站距（km）， 为无分集时衰落深度（dB）， 为工作频率（GHz），， 和 为两个空间分集天线的增益（dB）， 为衰落因子， 为分集接收天线间的垂直距离（m）。 (zh) Antenna diversity, also known as space diversity or spatial diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a wireless link. Often, especially in urban and indoor environments, there is no clear line-of-sight (LOS) between transmitter and receiver. Instead the signal is reflected along multiple paths before finally being received. Each of these bounces can introduce phase shifts, time delays, attenuations, and distortions that can destructively interfere with one another at the aperture of the receiving antenna. (en) |
| rdfs:label | Antennendiversität (de) Antenna diversity (en) 空间分集 (zh) |
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