Ericsson's LTE Essential Patent Candidate: SE2006000002319

Title: DTF SPREAD OFDM

WO2008054322 (SE2006000002319)

Application Year: 2006

Abstract

The invention applies DFT-spread-OFDM which is proposed for the 3GPP LTE uplink. The core of the invention is that we use a cyclic frequency shift operation over part of the bandwidth spanned by the IFFT. Furthermore, the cyclic frequency shift enables efficient inter-cell interference coordination in case neighbouring cells hop with the same pattern and different initial offsets. Equivalent operation may be performed in the time domain.

Rep. Claim

Transmitter device (400) for a wireless communication network comprising a transform unit (420) for transforming a signal from the time domain to the frequency domain, an expansion unit (430) for expanding the transformed signal in the frequency domain and an inverse transform unit (450) for performing the transformation of the expanded signal in the frequency domain back into the time domain characterised by that said transmitter further comprises a shifting unit (440) adapted to perform a cyclic frequency shift for the frequency domain signal over at least part of the available bandwidth for the frequencies used.

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