Ppt lte

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Ppt lte

  1. 1. E-MBMS • Increasing spectral efficiency at cell edge upto 1bps/Hz • Support 20 Mobile Channel @256 Kbps in 5 MHZ channel. • Provide Good coverage by single frequency Network • Low power consumption due to reception of short high data rate burst.
  2. 2. LTE-MBMS MBSFN principle • Multiple cell are synchronized and formed MBFSN Area. • Proper synchronization of radio cells, tx the same content resulting signal will appear to terminal as on e transmission over time dispersive radio channel. • If signal receives within cyclic prefix ISI is avoided. From "LTE – The UMTS Long Term Evolution" Sesia, Toufik, Baker John Wiley & Sons
  3. 3. eMBMS Network architecture
  4. 4. Single-user dual stream beam forming • In single-user dual-stream beamforming technology, the base station measures the upstream channels to glean their status information. • It then calculates two beamforming vectors according to this upstream channel information, and uses the vectors for downlink beamforming of the two data streams to be transmitted. In single-user dual-stream beamforming technology, a single user can simultaneously transmit two data streams, and thereby benefit from beamforming gains and spatial 20 multiplexing gains at the same time.
  5. 5. Multi-user dual stream beam forming • In multi-user dual-stream beamforming technology, the base station matches multiple users according to upstream channel information or UE feedback. • It then, according to certain criteria, generates beamforming vectors, and uses the vectors for the beamforming of each UE and each stream. Multiuser dual-stream beamforming technology uses the smart antenna beam direction to enable multi-user spatial division multiple access (SDMA).

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