RESEARCH REQUIRED FOR 4G WIRELESS APPLICATIONS



The common research areas which are evolving for 4G of wireless communication systems are:
  1. New decoding algorithms for turbo codes for wireless channels.
  2. New coding/modulation techniques for reducing the peak-to-mean envelope ratio, maximizing the data rate and providing large coding gain.
  3. New approaches to jointly designing modulation techniques, and power amplifiers to simultaneously obtain high power added efficiency along with bandwidth efficiency.
  4. New demodulation / decoding techniques to simultaneously combat the near-far problem and do channel decoding in multi-rate DS-CDMA (Direct Sequence Code Division Multiple Access) systems.
  5. Communication problems unique to high frequency systems (e.g., channel estimation).
  6. Joint channel estimation and decoding/demodulation algorithms.
  7. Multiple-access techniques for multi-rate systems with variable quality of service requirements.
  8. Space-time coding for systems with multiple antennas.
  9. Analog decoding techniques for high speed, low power systems.
  10. Ultra wideband systems and hardware design. (xi) Research in methodologies for an integrated approach to wireless communications (device layer: e.g., power and low noise amplifiers, mixers, filters; physical layer: coding, modulation; medium access layer: CDMA/FDMA/TDMA; data link layer: hybrid ARQ (Automatic Repeat Request); network layer: routing protocols).

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