By Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Alonso-Zarate, J.; Crespo, Cristian; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga
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Additional resources for Hybrid access techniques for densely populated wireless local area networks
The random cyclic delay diversity technique is then applied to make the equivalent channels frequency selective. At the destination node the frequency domain equalizer (FDE) is employed to combine and equalize the received signal. The scheme has a disadvantage that it could suffer performance degradation due to diversity loss by random row selection. Similar to the previous scheme, this system also assumes the relay to be half duplex which results in low spectral efﬁciency. , 2006), employ half duplex relays.
Processing at the relay node will cause some additional time delay τ, which could be a few symbols duration and is much shorter than the frame duration T. It must be noted that the APC system does not require symbol level synchronization, between the source and relay, and thus τ can be any positive real number. Fig. 6 illustrates the timing diagram of this scheme. The vertically and horizontally polarized signal received at the destination, denoted as ydv and ydh respectively, are given by √ v ysr (t − τ − u ) + n dv (t) (7) ydv (t) = E s h˜ vsd x (t − u ) + kr h˜ rd and ydh (t) = √ h E s h˜ hsd x (t − u ) + kr h˜ rd ysr (t − τ − u ) + n dh (t).
2008). RSS Measurement for Vertical Handoff in Heterogeneous Network, Journal of Theoretical and Applied Information Technology, Vol. 4, Issue 10, October 2008. ; Qiu, B. S. (2007). Combined SINR based vertical handover algorithm for next generation heterogeneous wireless networks, Proceeding on IEEE GLOBECOM 2007, November 2007, Washinton (USA). ; Neri, A. & Ragosa, G. (2007). QoS-based Vertical Handover in heterogeneous networks, Proceeding on 10th International Wireless Personal Multimedia Communications, CD-ROM no.
Hybrid access techniques for densely populated wireless local area networks by Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Alonso-Zarate, J.; Crespo, Cristian; Verikoukis, Christos; Alonso Zárate, Luis Gonzaga