[信息与通信]LTEPrimeMarch2011Student.ppt

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[信息与通信]LTEPrimeMarch2011Student

* * * * LTE - Summary When will all this cool stuff happen? A. Tomorrow B. When money is no object C. Whenever the consumer wants it D. None of the above * LTE - Summary Still in early life cycles Voice and SMS not going away 2.5 and 3G technologies have excellent voice efficiency * LTE - Summary Disparity between what end user may be willing to pay No real advantage for an operator for faster data without paying premium Balance capacity versus current voice model * LTE - Summary QoS pricing models critical Consumer perception...I want it free Outsiders want in… * That is it… We’re done! There is some extra stuff … if you want to a little more! * Bonus Question - Wireless Technologies Obstacles Wireless technologies must take into consideration: Distance Shadow fading Multipath fading All the above Wireless Technologies All wireless technologies must manage propagation Distance – signal loss is a function of distance from base station Shadow Fading – signal loss occurs to do obstructions, e.g., building, trees, etc. Multipath Fading – signal loss occurs by interference between radio waves reflected from surrounding obstacles Lower the frequency farther the coverage area Wireless Solutions All 3G+ wireless technologies use the same advance technologies AMC – Adaptive Digital Modulation Coding HARQ – Hybrid Automatic Repeat Request OFDMA – Orthogonal Frequency Division Multiplexing Access MIMO - Multiple Input Multiple Output Antenna Technology Source: Fye Associates AMC – Adaptive Digital Modulation Coding Adaptive modulation adjusts bits to fit channel conditions BPSK SNR = 6 QPSK SNR = 9 64 QAM SNR = 22 16 QAM SNR = 16 As you move away from the target or transmitter with Adaptive modulation it changes … slower but still connected. Source: Fye Associates Hybrid Automatic Repeat Re

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