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AssigneeLucent Technologies Inc.
InventorRichard D. J. van Nee
Estimating the term…
The scaleable OFDM system according to the principles of the present invention provides increased flexibility and adaptability by providing scaling of the operating parameters and/or characteristics for the OFDM system. For example, control circuitry can scale the bit rate by scaling of the OFDM symbol duration, the number of carriers and/or the number of bits per symbol per carrier. Scaleability permits the scaleable OFDM system to operate in various communications environments requiring various operating parameters and/or characteristics. By scaling the operating parameters and/or characteristics of the OFDM system when control circuitry determines that different operating parameters and/or characteristics are necessary or advantageous, the control circuitry can dynamically change the operating parameters and/or characteristics, thereby providing compatibility or the desired performance. For example, by dynamically scaling the bit rate, widely varying signal bandwidths, delay spread tolerances and signal-to-noise ratio (SNR) requirements can be achieved. As such, a scaleable OFDM system is particularly suitable for application in mobile, wireless communication devices, which support a variety of services, in a variety of environments, indoor as well as outdoor and in radio channels with differing bandwidths.
A method for providing communication signals according to operating parameters using orthogonal frequency division multiplexing (OFDM), said operating parameters including symbol duration, guard time interval, number of OFDM carriers, and number of bits per symbol per OFDM carrier, said method comprising the step of:
A method of receiving orthogonal frequency division multiplexed (OFDM) symbols according to operating parameters, said operating parameters including symbol duration, guard time interval, number of OFDM carriers, and number of bits per symbol per OFDM carrier, said method comprising the step of:
A method of receiving orthogonal frequency division multiplexed (OFDM) symbols at a downlink data rate according to operating parameters, said operating parameters including symbol duration, guard time interval, number of OFDM carriers, and number of bits per symbol per OFDM carrier, said method comprising the steps of:
An orthogonal frequency division multiplexing (OFDM) system for providing communication signals according to operating parameters, said operating parameters including symbol duration, guard time interval, number of OFDM carriers, and number of bits per symbol per OFDM carrier, said system comprising dynamic control circuitry which receives a feedback signal from a receiver, determines whether an operating characteristic of said method should be scaled from a first level to a second level based on said feedback signal, said operating characteristic being at least one of transmission rate, signal-to-noise ratio, and delay-spread tolerance, and, after determining that said operating characteristic for providing communication signals should be scaled from said first level to said second level based on said feedback signal, provides control signals to signal circuitry to dynamically scale at least one of said operating parameters to achieve said operating characteristic of said second level, said control circuitry controlling a scalable operating characteristic by adaptively selecting one of a plurality of operating parameter scaling options.
Dependencies are inferred from the claim text.