We outline the benefits and challenges of using angle diversity in nondirected wireless infrared (IR) communications systems. Multiple transmitter beams and multiple narrow field-of view receivers reduce the path loss, multipath distortion, and background noise of the channel, which leads to improved range. We also discuss practical considerations for multielement angle diversity systems, including channel characterization and suboptimal detection techniques. Maximal-ratio combining provides nearly optimal performance up to 100 Mb/s for the angle diversity systems considered. The design and performance of a prototype angle diversity IR communication system are discussed. The prototype can maintain 70 Mb/s at a P/sub e/ of 10/sup -9/ over a 4-m range.
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机译：我们概述了在无向无线红外（IR）通信系统中使用角度分集的好处和挑战。多个发射器光束和多个狭窄的视场接收器可减少路径损耗，多径失真和通道的背景噪声，从而改善了范围。我们还将讨论多元素角度分集系统的实际考虑，包括信道表征和次优检测技术。对于所考虑的角度分集系统，最大比率组合可提供高达100 Mb / s的几乎最佳性能。讨论了原型角度分集红外通信系统的设计和性能。该原型可以在4-m范围内以10 / sup -9 /的P / sub e /维持70 Mb / s。
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