By Mustafa Ergen
Mobile Broadband: together with WiMAX and LTE offers an summary of IP-OFDMA expertise, beginning with mobile and IP know-how for the uninitiated whereas offering a origin for OFDMA conception and rising applied sciences, resembling WiMAX, LTE, and past.
- A coherent and systematic dialogue of all facets of cellular Broadband Wireless,
- Thorough details on OFDMA and All-IP Networking with its current know-how in 4G,
Information to help pros in knowing the convergence of middle entry networks, machine convergence and repair convergence.
Throughout the publication the writer additionally discusses numerous instant criteria in accordance with OFDMA reminiscent of UMB, IEEE 802.16j (Mobile Multihop Relay) and 802.16m (Gigabit WiMAX), IEEE 802.20 (MBWA), and IEEE 802.22 (Cognitive Radio). The publication brings a very good stability of conception, expertise and perform of cellular broadband.
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Extra info for Mobile Broadband: Including WiMAX and LTE
8) where I(t) and Q(t) are the modulating signals from the QAM constellation and fc is the carrier frequency. In QAM, the constellation points are usually arranged in a square grid with equal vertical and horizontal spacing as seen in Fig. , Cross-QAM). The most common forms of QAM constellation are 16QAM, 64QAM, 128-QAM, and 256-QAM. Higher-level constellation enables transmitting more bits per symbol; however, if the mean energy is kept constant, then the points in the constellation comes closer as constellation size gets higher.
Total capacity C is then equals to m × F. For instance, in precellular concept, total capacity is F since m = 1 and n = 1. Of course, the above analysis gives theoretical capacity since in real deployment, cells operating with the same channel cause co-channel interference to each other. To reduce the co-channel interference, cells operating in the same channel should be separated by a distance to provide ample protection. Co-channel reuse ratio is given by D/R, where D is the distance of two same channel cells and R is cell radius.
16 Two-ray module • If ht < d < dc , signals experience constructive and destructive interference up to a critical distance dc ≈ 4ht hr /λ . • If dc < d, signals experience destructive interference and path loss is proportional to 1/d 4 . There are several more sophisticated ray tracing models that consider more than one reflection. 12) , where PL = Pr − Pt in dBm and do is reference distance for the antenna far field. K is unitless constant given in dBm by the following formula; K dB = 20 log10 λ .