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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 21 / 107

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Station (BS) and one or more subscribe station (SS), depending on the implementation of the topology. Therefore, the BS provides Point to Point (PTP) service or Point to Multi­ point (PMP) service in order to serve multiple SSs. BSs provide connectivity to core networks. The SS can be a roof mounted or wall mounted customer premises equipment (CPE) or a stand alone hand held device like Mobile phone, personal digital assistant (PDA) or peripheral component interconnect (PCI) card for PC or Laptop. In case of a outside CPE, the users inside the building are connected to a conventional network like Ethernet Local Area Network (IEEE 802.3 for LAN) or Wireless LAN (IEEE 802.11b/g for WAN) which have access to the CPE. A group of cells can be grouped together to form a network, where BSs are connected through a core network, as shown in Figure 2.2. The IEEE 802.16 network also support mesh topology, where SSs are able to communicate among them selves without the need of a BS [1].

SSs

BS

Ss

Core Network

BS

SSs

BS

Figure 2.2: A typical IEEE 802.16 Network

BSs typically employ one or more wide beam antennas that may be partitioned into several smaller sectors, where all sectors sum to a complete 360 degree coverage. CPEs typically employ highly directional antennas that are pointed towards the BS. Depending on the need, IEEE 802.16 network can be deployed in different forms.

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