The rapid increase in number of used carriers and MIMO streams in modern LTE devices introduce new challenges when measuring radio performance. This white paper gives an introduction to Over-the-Air (OTA) measurements of such devices and what to consider when moving from a conducted measurement to measurements in a multipath faded OTA environment.
It is common nowadays to add a cover to your mobile phone, both for protection and esthetical reasons. They are available in many different stores including the mobile operator branded stores. The material and form varies considerably from one cover to another. You can get everything from plastic and rubber covers to silicon or metal. Of course the different materials have pros and cons. Some are more protective, even against the delivery of data. The question that follows is; how does a cover affect the performance of the antenna?
Base stations and/or terminals with multi-antenna configurations are expected to significantly contribute to much higher bit rates in mobile broadband systems. Higher bit rates using multi-antenna systems can, when there is rich scattering in the communication channel, be achieved 1) by increasing the modulation rate and/or reducing the coding rate as the Signal to Noise Ratio (SNR) is increased through the use of diversity combining, or 2) through the use of simultaneous partially uncorrelated communication channels (Multiple Input Multiple Output, MIMO).