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
Object tracking using linear features
Resist pattern forming method and developer
Distributed vision system with multi-phase synchronization
Image correction apparatus and image correction method
Side mirror for a vehicle
Exercise device
Adapting bit error rate to a target quality of service
  Randomly Featured Patents
Electronically controlled throttle control apparatus
Method and system in data processing system of permitting concurrent processing of instructions of a particular type
Farm equipment hitch
Direct amplitude modulation for switch mode power supplies
Pyrido[4,3-b][1,4]oxazines and pyrido[4,3-b][1,4]thiazines
Method of interfacing detector array layers
No-break power supply apparatus
Seat locking mechanism and seat incorporating same
Method for evaluating a pollution characteristic of a soil sample
Integrated seatback display system