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Some Thoughts on the Technical Requirements for a HTSG

Some Thoughts on the Technical Requirements for a HTSG. John Terry, NRC. 4. Technical Feasibility. Potential Approaches to Study: Modulation and Coding Enhancements Spatial Diversity Techniques Spatial Multiplexing 4. Double bandwidth solutions with underlying 11a waveforms

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Some Thoughts on the Technical Requirements for a HTSG

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  1. Some Thoughts on the Technical Requirements for a HTSG John Terry, NRC John Terry, PhD, Nokia

  2. 4. Technical Feasibility Potential Approaches to Study: • Modulation and Coding Enhancements • Spatial Diversity Techniques • Spatial Multiplexing 4. Double bandwidth solutions with underlying 11a waveforms • Example: Proxim Harmony 802.11a with 2x mode John Terry, PhD, Nokia

  3. Modulation and Coding Techniques • Turbo Coding • Multidimensional Constellations • Gallager Codes (Low Density Parity Check Codes) • Trellis Coded or Block Coded Modulation • Attractiveness: Improved Coding Gains and increased Euclidean distances • Issues: Limited number of members with expertise in field • Complexity of some techniques might be prohibitive John Terry, PhD, Nokia

  4. Spatial Diversity • Trellis Space-Time Codes • Block Space-Time Codes concatenated with an inner code • Beamforming Techniques • Receiver Diversity • Attractiveness: • Issues: John Terry, PhD, Nokia

  5. Spatial Multiplexing • MIMO • Watering-Fill Techniques for Wireless Application (Adaptive Modulation) • Attractiveness: • Issues: John Terry, PhD, Nokia

  6. Bandwidth Expansion • Attractiveness • Products exists • Simple and easy to understand • Issues: • Performance • System Capacity does not necessarily increase • Problem with mixed mode (.11a+ HRa) operations John Terry, PhD, Nokia

  7. Conclusions John Terry, PhD, Nokia

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