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Extra info for Wireless Communications
Sample text
Net oldroad Ch. 2 • The Cellular Concept — System Design Fundamentals 28 'lb understand the frequency reuse concept, consider a cellular system which has a total of S duplex channels available for use. 1) The N cells which collectively use the complete set of available frequencies is called a cluster. 2), the capacity of a cellular system is directly proportional to the number of times a cluster is replicated in a fixed service area. The factor N is called the cluster size and is typically equal to 4, 7, or 12.
Furthermore, the cellular concept allows every piece of subscriber equipment within a country or continent to be manufactured with the same set of channels, so that any mobile may be used anywhere within the region. 2 Frequency Reuse Cellular radio systems rely on an intelligent allocation and reuse of chan- nels throughout a coverage region [0et83]. Each cellular base station is allocated a group of radio channels to be used within a small geographic area called a cell. Base stations in adjacent cells are assigned channel groups which contain completely different channels than neighboring cells.
There are now 832 channels used in AMPS. 030 MHz) is numbered as channel 1. 2). The extended band has channels numbered as 667 through 799, and 990 through 1023. In order to encourage competition, the FCC licensed the channels to two competing operators in every service area, and each operator received half of the total channels. The channels used by the two operators are distinguished as block A and block B channels. Block B is operated by companies which have traditionally provided telephone services (called wireline operators), and Block A is operated by companies that have not traditionally provided telephone services (called nonwireline operators).