DISTRIBUTED ANTENNAS FOR INDOOR RADIO-COMMUNICATIONS
DISTRIBUTED ANTENNAS FOR INDOOR RADIO-COMMUNICATIONS
复制标题
DOI：
10.1109/tcom.1987.1096716
复制
发表时间：
1987-12-01
影响因子：
8.3
通讯作者：
ROMAN, RS
中科院分区：
文献类型：
--
作者：
SALEH, AAM;RUSTAKO, AJ;ROMAN, RS
实现从单个中央天线为整个建筑物服务的室内无线电通信系统的想法似乎是一个有吸引力的提议。然而，基于信号衰减和多径延迟扩展的各种室内传播测量，这种集中式方法似乎限于小型建筑物和具有有限可靠性和灵活性的窄带FDMA型系统。在本文中，我们提出了室内无线电传播测量的两种信号分布的方法，大大提高了图片的结果。在第一种情况下，建筑物被划分为许多小小区，每个小区由位于其中心的天线提供服务，相邻小区在不同的频带中工作。在第二种方法中，建筑物被划分为一个或多个大型小区，每个小区由分布式天线系统或蜿蜒穿过走廊的“泄漏馈线”提供服务。这种方法消除了在第一种方法中必然存在的频率小区切换问题，同时与集中式系统相比，仍然保持了多径延迟扩展和信号衰减的显著减少。例如，测量结果表明，无论采用哪种方法，信号衰减都可以减少几十分贝，均方根延迟扩展限制在20至50 us，即使在大型建筑物中也是如此。这可以实现复杂的宽带TDMA类型的系统，灵活，鲁棒，几乎独立于建筑物。
The idea of implementing an indoor radio communications system serving an entire building from a single central antenna appears to be an attractive proposition. However, based on various indoor propagation measurements of the signal attenuation and the multipath delay spread, such a centralized approach appears to be limited to small buildings and to narrow-band FDMA-type systems with limited reliability and flexibility. In this paper, we present the results of indoor radio propagation measurements of two signal distribution approaches that improve the picture dramatically. In the first, the building is divided into many small cells, each served from an antenna located in its own center, and with adjacent cells operating in different frequency bands. In the second approach, the building is divided into one or more large cells, each served from a distributed antenna system or a "leaky feeder" that winds its way through the hallways. This approach eliminates the frequency cell handoff problem that is bound to exist in the first approach, while still preserving the dramatic reductions in multipath delay spread and signal attenuation compared to a centralized system. For example, the measurements show that, with either approach, the signal attenuation can be reduced by as much as a few tens of decibels and the rms delay spread becomes limited to 20 to 50 us, even in large buildings. This can make possible the implementation of sophisticated broad-band TDMA-type systems that are flexible, robust, and virtually building-independent.