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Recent OFDM Headlines

FreshPatents.com System and method for data scrambling to reduce the crest factor in an ofdm waveform
A method is provided for minimizing the peak power level in a combination of orthogonal frequency division multiplexed (OFDM) tones. The method is particularly effective when the information to be communicated is digital data consisting of long patterns of “1”s or “0”s. The digital data of the message is combined...

FreshPatents.com Sub-carrier alignment mechanism for ofdm multi-carrier systems
A method of aligning sub-carriers of radio signals of two adjacent frequency channels and devices therefor are described. The method comprises aligning a first plurality of sub-carriers of a first radio signal and a second plurality of sub-carriers of a second radio signal within an overlapped frequency region in-between the...

FreshPatents.com Frequency dependent phase rotation prior to mapping in an ofdm transmitter
An input bit stream is phase rotated by reversing bit pairs and inverting bits. The manipulated bit stream is mapped to a symbol and the mapped symbol is converted to the time domain such that an output of the time domain conversion is an ordered set of N samples that...

FreshPatents.com Bandwidth asymmetric communication system
The present invention relates to a bandwidth asymmetric communication system comprising at least one terminal having an uplink transmission unit (1) for transmitting radio frequency OFDM signals at a radio frequency and an access point having an uplink receiving unit (4) for receiving said radio frequency OFDM signals, said OFDM...

FreshPatents.com System and method for processing secure transmissions
A method and apparatus for improving channel estimation within an OFDM communication system. Channel estimation in OFDM is usually performed with the aid of pilot symbols. The pilot symbols are typically spaced in time and frequency. The set of frequencies and times at which pilot symbols are inserted is referred...

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