Abstract: Natural radio environments are emulated using field traces and a channel emulator to test radio devices. In one example, a test includes a field trace source to replay recorded field traces, a protocol tester to receive the replayed field traces to extract configuration parameters from the replayed field traces, to extract signals from the field traces, to send the signals to a device under test, and to receive signals from the device under test, and a channel emulator coupled to the field trace source, and between the protocol tester and the device under test, to receive the replayed field traces, to mix the replayed field traces with signals and to emulate the channel between the protocol tester and the device under test.

Abstract: Natural radio environments are emulated using field traces and a channel emulator to test radio devices. In one example, a test includes a field trace source to replay recorded field traces, a protocol tester to receive the replayed field traces to extract configuration parameters from the replayed field traces, to extract signals from the field traces, to send the signals to a device under test, and to receive signals from the device under test, and a channel emulator coupled to the field trace source, and between the protocol tester and the device under test, to receive the replayed field traces, to mix the replayed field traces with signals and to emulate the channel between the protocol tester and the device under test.

Abstract: Natural radio environments are virtualized to test radio devices. In one example, this is done by extracting signals and messages recorded in the field and injecting them in the operation of a protocol tester. In another example, the radio environment is reproduced by generating channel impulse responses in a ray-tracer, then interpolating them in a channel emulator and supporting the interpolation by means of post-processing. In another example, the radio environment is recorded using a mobile terminal in the field. In another example, natural radio environments are produced by reconstructing realistic cell loads and, as a consequence, intra-cell interference for a given device under test.

Abstract: Natural radio environments are virtualized to test radio devices. In one example, this is done by extracting signals and messages recorded in the field and injecting them in the operation of a protocol tester. In another example, the radio environment is reproduced by generating channel impulse responses in a ray-tracer, then interpolating them in a channel emulator and supporting the interpolation by means of post-processing. In another example, the radio environment is recorded using a mobile terminal in the field. In another example, natural radio environments are produced by reconstructing realistic cell loads and, as a consequence, intra-cell interference for a given device under test.

Abstract: An apparatus for making a magnetic recording medium, including a quartz lamp within a sputtering chamber to heat the medium between the application of layers and without disruption to the vacuum integrity of the sputtering system. A process using the apparatus for manufacturing the magnetic recording medium is also claimed.

Abstract: A method and apparatus for reducing a channel updating rate in a communication system are provided, in which a channel matrix H representing a channel status of physical channels is acquired, eigenvectors of the channel matrix H are output by a Singular Value Decomposition (SVD) of the channel matrix H, and when at least one of the eigenvectors has a phase inversion, the phase inversion is removed from the eigenvector.