The common research areas which are evolving for 4G of wireless communication systems are:
- New decoding algorithms for turbo codes for wireless channels.
- New coding/modulation techniques for reducing the peak-to-mean envelope ratio, maximizing the data rate and providing large coding gain.
- New approaches to jointly designing modulation techniques, and power amplifiers to simultaneously obtain high power added efficiency along with bandwidth efficiency.
- 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.
- Communication problems unique to high frequency systems (e.g., channel estimation).
- Joint channel estimation and decoding/demodulation algorithms.
- Multiple-access techniques for multi-rate systems with variable quality of service requirements.
- Space-time coding for systems with multiple antennas.
- Analog decoding techniques for high speed, low power systems.
- 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).
No comments:
Post a Comment