Enhanced frequency domain spreading

Details Enhanced frequency domain spreading Enhanced frequency domain spreading

2011-07-19

2011-07-19

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Transmitters

C370S208000, C370S210000

Reexamination Certificate

active

07983356

ABSTRACT:
A system and method are provided for using frequency domain spreading to generate real signals in the time domain. The method supplies a first complex frequency domain symbol (α) and a second complex frequency domain symbol (αi), and maps (α+jαi) onto a subcarrier (+f). Further, (α−jαi)* is mapped onto a mirror subcarrier (−f). The mappings are converted into a complex time domain symbol carrying α and jαiin a single inverse fast Fourier transformation (IFFT). The real component of the complex time domain symbol (α) is initially supplied, and subsequently supplied is an imaginary component of the complex time domain symbol (αi). The real symbol component (α) is supplied by carrying α on the subcarrier (+f), and carrying (α)* on the mirror subcarrier (−f). The imaginary symbol component αiis supplied by carrying αion the subcarrier (+f), and carrying (αi)* on the mirror subcarrier (−f).

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Takeda et al., “Time Domain Spreading and Frequency Domain Spreading for Delay-Time Code Diversity Multi-Access,” IEEE Publication on Vehicular Tec. Conference, 2008, pp. 1529-1533.

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