Wireless bandwidth in the making

Abstract

Several emerging communication technologies hold the key to approaching the information theoretic limits of wireless multiple access channels. This article offers a brief review of those technologies and their promise to meet future demand for wireless data rate.

Load mitigation in cellular data networks by peer data sharing over WLAN channels

“…Finding a minimum dominating set is an NPcomplete problem [30]. 3 When the number of mobile hosts in the network is large and uniformly distributed across the cell, then this problem generalizes to the Circle Covering Problem [31], i.e., the number of circles of radius e, e 6 1, needed to cover a unit disc D completely.…”

“…Since it is not possible to have ubiquitous coverage through WLAN hotspots, mobile users who require continuous connectivity will have to connect through the cellular data network when WLAN access is unavailable. With the exponential growth in wireless data users and the projected linear-scale growth in cellular data bandwidth [3], the cellular channel is expected to become increasingly overloaded and congested, resulting in degraded service performance experienced by wireless users. This situation will be further exacerbated with the introduction of multimedia applications (e.g., full-blown Web browsers, video and audio players) on mobile devices [4][5][6].…”

Generalized Multicarrier CDMA: Unification and Linear Equalization

“…It also shows how the frequency reallocation preserves the symbol recovery property and it illustrates how the error performance is affected by the reallocation. Current DS-CDMA technology achieves a typical bandwidth efficiency of 25% [15]. Therefore, multiple-access schemes with improved utilization of resources (in our case, the subcarriers) have considerable practical impact.…”

Spectrum Measurements supporting Reconfiguration in Heterogeneous Networks

“…T HERE is no doubt that the demand for bandwidth is increasing enormously in the near future, most notably with respect to innovative multi-media applications that tend to provide services whenever and wherever users ask for them [1], [2]. This ubiquitous scenario obviously requires new communication techniques that are able to overcome the inherent limitations of the radio frequency spectrum [3].…”