Читать книгу Position, Navigation, and Timing Technologies in the 21st Century - Группа авторов - Страница 74

Cellular CDMA networks employ orthogonal and maximal‐length pseudorandom noise (PN) sequences in order to enable multiplexing over the same channel. In a cellular CDMA communication system, 64 logical channels are multiplexed on the forward link channel: a pilot channel, a sync channel, 7 paging channels, and 55 traffic channels [46]. The following sections discuss the modulation process of the forward link and give an overview of the pilot, sync, and paging channels from which timing and positioning information can be extracted. Models of the transmitted and received signals are also given.