Multicarrier Access and Routing for Wireless Networking
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Multicarrier Access and Routing for Wireless Networking Diakoumis Gerakoulis General Dynamics Advanced Information Systems, Bloomington, MN 55431, USA Email: [email protected] Received 28 February 2005; Recommended for Publication by Fary Z. Ghassemlooy A multicarrier access and routing system has been proposed for use in wireless networks. Users within each cell access a radio port (RP). All RPs are connected to a radio exchange node (REN) which routes the calls or packets. The uplink access is orthogonal multicarrier code-division multiple access (MC-CDMA) and the downlink transmission is multicarrier orthogonal code-division multiplexing (MC-OCDM). The REN contains a switch module which provides continuous routes between wireless terminals without demodulation/remodulation or channel decoding/reencoding. The switch module is nonblocking and has complexity and speed linearly proportional to its size. Also, the switch module does not introduce interference into the network. Any existing interference or noise in its input port is transferred to its output port. The input-output switch connections are assigned on demand by a control unit. A random input/output port assignment process can achieve maximum switch throughput. Keywords and phrases: multicarrier access, multicarrier routing, multicarrier CDMA, radio exchange node, switch module.
1.
INTRODUCTION
Multicarrier transmission methods have been widely accepted and used because of their advantages over singlecarrier transmission in broadband wireless links. The existing multicarrier systems however, such as the orthogonal frequency-division multiplexing (OFDM), are only defined for the physical layer, while wireless networks also require a method for multiuser access and routing. This paper focuses on the development of a multicarrier system that operates at physical, multiple access and routing level. The transmission and access is based on orthogonal multicarrier (MC) codedivision multiple access (CDMA), see [1, 2, 3, 4, 5]; while the routing scheme on code-division multiplexing [6]. The wireless network is assumed to have the configuration shown in Figure 1. It consists of a radio exchange node (REN) connected to a number of radio ports (RPs). All RPs are connected to the radio exchange node (REN) which routes packets or calls between RPs. Users within each cell access the corresponding radio port (RP) by an orthogonal multicarrier CDMA described in [5]. All uplink transmissions require synchronization. The downlink transmission is multicarrier orthogonal code-division multiplexing (OCDM) described in [4]. The REN contains the
switch module which routes packets and calls between radio ports without demodulation/remodulation or channel decoding/reencoding. Such a wireless network then provides a continuous mobile-to-mobile route that achieves high network throughput and spectral efficiency. In Section 2 we present the system description and verify its functional correctness. In Section 3 we examine the network capacity and performance which includ
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