The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For the unlicensed spectrum, the occupied bandwidth requirement is demanded by some regulations. The legacy scheme of Physical Random Access Channel (PRACH) for Long Term Evolution (LTE) cannot satisfy it. In this paper, we propose a novel PRACH transmission scheme to satisfy the requirement of unlicensed spectrum based on preamble pairing, and show some other candidates. We analyze and evaluate the...
Carrier aggregation (CA) is one technique in Long Term Evolution — Advanced (LTE-A) system, which can extend the bandwidth up to 100MHz and increase the downlink and uplink spectral efficiency. In particular, NxDFT-s-OFDM has been agreed as the uplink bandwidth extension scheme. Nevertheless, the peak-to-average power ratio (PAPR) remains an important issue for user equipment (UE) because it determines...
Nx SC-FDMA has been accepted as one of the main multiple access schemes for LTE-Advanced, which has been attracted much attention for supporting extended bandwidth. The classical transmit antenna diversity technique as frequency switched transmit diversity (FSTD) has divided the transmitted data into two sub-groups, with each group being transmitted from half sub-carriers associated with one transmit...
Nx SC-FDMA has been accepted as one of the main multiple access schemes for LTE-Advanced, which has been attracted much attention for supporting extended bandwidth. The classical transmit antenna diversity technique as Space-Frequency Block Coding (SFBC) will destroy the order and structure of the original symbols and thus enhance the peak-to-average power ratio (PAPR). To solve this problem, a modified...
Single carrier frequency division multiple access (SCFDMA) has been adopted as a possible air interface for future wireless networks as it combines the advantages of Orthogonal Frequency Division Multiple Access (OFDMA) and the low envelope variation properties of single carrier (SC) transmission. The classical transmit antenna diversity technique as Space-Frequency Block Coding (SFBC) will harm single-carrier...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.