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１９８５年美国联邦通信委员会ＦＣＣ在工业、科技、医疗频段共划分了２３４．５ＭＨｚ，允许扩频通信设备免许可证使用。由于ＩＳＭＢａｎｄ带宽的限制，目前符合规定的设备局限在传输数据率低或对系统性能要求不高的应用背景下。无线局域网将是无线通信领域中下一个前景最大的市场之一，人们正在努力开发高速率的扩频无线数据传输技术。
The FCC of the United States in 1985 divided the 234.5 MHz in the industrial, scientific, medical and medical frequency bands, allowing spread-spectrum communications equipment to be used without a license. Due to the limitation of ISMBand bandwidth, the current compliant devices are limited to applications with low transmission data rates or low system performance requirements. Wireless LAN will be one of the most promising markets for wireless communications and efforts are being made to develop high-rate spread spectrum wireless data transmission.