An LTE User Equipment (UE) can only be scheduled for uplink transmission if its uplink transmission timing is synchronized. The LTE Random Access Channel (RACH), therefore, plays a key role as an interface between nonsynchronized UEs and the orthogonal transmission scheme of the LTE uplink radio access.

Cognitive radio transceiver can opportunistically access the underutilized spectrum resource of primary systems for new wireless services. With interweave cognitive implementation, the secondary transmission may be interrupted by the primary user’s transmission. To facilitate the packet delay analysis of such secondary transmission, we study the resulting extended delivery time that includes bo...

Multicarrier transmission systems with a specific subcarrier allocation such as equidistantly interleaved OFDMA or Interleaved Frequency Division Multiple Access (IFDMA) are promising candidates for future mobile radio systems, because they provide many advantages such as high flexibility, good performance and low computational complexity. In this paper, a new method for accommodation of differ...