Zadoff Chu (ZC) sequences are the primary manifestation of spread spectrum in modern cellular systems including LTE and 5G NR, displacing PN and Walsh sequences which were the mainstays of 3G cellular (WCDMA and cdma2000) and IS-95. ZC sequences are complex sequences with unit amplitude and particular phase shifts, as opposed to Walsh and PN codes which are real and binary valued, most commonly $\pm 1$ when used in communication systems. ZC sequences have a number of remarkable and desirable properties. Because of these uniquely desirable properties, they are used for many key functions in current cellular systems, and are likely to be prevalent in future cellular systems as well.

翻译：Zadoff Chu(ZC)序列是包括LTE和5G NR在内的现代蜂窝系统中传播频谱的主要表现,取代PN和Walsh序列,它们是3G细胞(WCDMA和cdma2000)和IS-95的支柱。 ZC序列是单位振幅和特定阶段转移的复杂序列,而Walsh和PN代码是真实和二进制价值的,在通信系统中使用时最常见的是1美元。ZC序列具有一些显著和可取的特性。由于这些独特的特性,它们被用于目前蜂窝系统中的许多关键功能,并且可能在未来蜂窝系统中也很普遍。