 rates that can be provided in such scenarios distance between the transmitter and the receiver, are always limited by the available received signal thereby reducing the attenuation of the signal as it power or, in the general case, the received signal propagates from the transmitter to the receiver. Thus, in power-to-noise-power ratio. Furthermore, any a noise-limited scenario it is at least in theory always increase of the achievable data rate within a given possible to increase the achievable data rates, assuming bandwidth will require at least the same relative that one is prepared to accept a reduction in the Power-limited Bandwidth-limited region region Bandwidth utilization r Figure 4.3-1 Minimum required Eb/No at the receiver as a function of bandwidth utilization. High data rates in mobile communications CHAPTER 4.3 transmitter/receiver distance, that is a reduced range. In mobile-communication scenarios, interference from a mobile-communication system this would correspond transmissions in neighbor cells, also referred to as inter- to a reduced cell size and thus the need for more cell sites cell interference, is often the dominating source of radio- to cover the same overall area. Especially, providing data link impairment, more SO than noise. This is especially rates in the same order as or larger than the available the case in small-cell deployments with a high traffic bandwidth, i.e. with a high-bandwidth utilization, would load. Furthermore, in addition to inter-cell interference require a significant cell-size reduction. Alternatively, one there may in some cases also be interference from other has to accept that the high data rates are only available for transmissions within the current cell, also referred to as mobile terminals in the center of the cell, i.e. not over the intra-cell interference. entire cell area. In many respects the impact of interference on Another means to increase the overall received a radio link is similar to that of noise. Especially, the signal power for a given transmi