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
Compounds and their salts specific to the PPAR receptors and the EGF receptors and their use in the medical field
Thermoplastic fluoropolymer composition
Signal generator
Stroboscopic image modulation to reduce the visual blur of an object being viewed by an observer experiencing vibration
Point-in-time copies in a cascade using maps and fdisks
Silicon-on-insulator (SOI) structure configured for reduced harmonics and method of forming the structure
Multiple RF band operation in mobile devices
  Randomly Featured Patents
Horizontal/vertical scanning frequency converting apparatus in MPEG decoding block
Autoloop system and method of operation
Cold cathode device
Antenna apparatus having means for changing the antenna radiation pattern
FPCB connection mechanism
Ball joint
Apparatus and methods for the harmonic enhancement of electronic audio signals
NOx purifying catalyst
Dispense tip with vented outlets
Detecting finger orientation on a touch-sensitive device