Resources Contact Us Home
Maximizing power and spectral efficiencies for layered and conventional modulations

Image Number 19 for United States Patent #8130818.

Methods and apparatuses for maximizing power and spectral efficiencies in a wireless communication system are disclosed. The invention is particularly useful for layered modulation applications because power levels for such applications are relatively high. A layered modulation signal comprises an upper and a lower layer signal that interfere with each other within the same frequency band such that the upper layer signal can be demodulated directly from the layered modulation signal, and the lower layer signal can be demodulated after subtracting the first layer signal from the layered modulation signal. The invention applies one or more of the following four signal schemes in a communication signal including varying the symbol rate (rather than the code rate), reducing or eliminating the guard band, reducing excess signal bandwidth and employing layered modulation within the guard band of the legacy signal.

  Recently Added Patents
Non-serialized electronic product registration system and method of operating same
Voltage detector having voltage detection printed board
Method and system for encrypting data in a wireless communication system
Method of controlling an indentation depth of an electrode into a metal substrate during welding
Automotive lighting system
System for purifying air through germicidal irradiation and method of manufacture
Process for preventing polymerization of cracked volatile products during pyrolysis and gasification
  Randomly Featured Patents
Methods and apparatus for network presence detection
Spined sanitary napkin and belt
Optimization of SQL queries using universal quantifiers, set intersection, and max/min aggregation in the presence of nullable columns
Method and apparatus for the separate harvesting of back skin and back meat from a carcass part of slaughtered poultry
Method of molding heat-resistant containers
Electrically actuated aircraft brakes
Image forming apparatus including a cleaning device
Haptic feedback for touchpads and other touch controls
Power on reset circuit with auto turn off