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Massive MIMO is considered a key technology for the future wireless communication systems. The promising properties in terms of higher spectral and transmit-energy efficiency are brought by the large number of antennas at the base station(BS). As the number of antennas increases, the aperture of the BS antenna array may become much larger, as compared to today's antenna arrays. In this case, mobile...
Spectrum prediction is a promising technology to infer unknown/unmeasured spectrum state from known/measured spectrum data, by exploiting the inherent correlations among them. This paper investigates spectrum prediction from a spectral-temporal two-dimensional perspective, with the primary objective to improve the prediction performance by jointly exploiting the correlations in both time and frequency...
Wireless communication using very-large multiple-input multiple-output (MIMO) antennas is a new research field, where base stations are equipped with a very large number of antennas as compared to previously considered systems. In theory, as the number of antennas increases, propagation properties that were random before start to become deterministic. Theoretical investigations with independent identically...
The development of MIMO over-the-air (OTA) test methodology is an ongoing activity in 3GPP RAN4, CTIA and EU COST Action 2100. In this paper, the focus is on the anechoic chamber approach, which uses a uniform circular array of probe antennas to replicate directional channels for the device-under-test at the array center. In particular, we study in simulation the complexity requirements of implementing...
Interference between femto-cell systems is a critical factor for the deployment of such systems in, e.g., residential areas. In this paper we report on a residential channel measurement campaign focusing on the channel properties for femto-cell systems. We characterize basic channel properties such as delay spread and interference levels between different furnished residential houses. In addition...
From concatenation view, this letter analyzed the construction of new frequency hopping (FH) sequences-cubic prime sequences. It is concluded that cubic prime sequences can be constructed by concatenating the frequency-shifted or time-shifted versions of prime codes. Upon this conclusion, two new further thoughts are deduced and more families of FH sequences are constructed with properties unchanged...
A new dynamic process monitoring method for flow industry production was investigated. The proposed method utilized generalized eigenvalue decomposition (GED), which involved temporal covariance matrix pencil, to deal with the dynamic character of process. The recursive approach of GED was also used to make the algorithm wieldier to practical applications. Compared with dynamic PCA, the new method...
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