Nokia Solutions and Networks Oy

Nokia Siemens Networks Gmbh & Co Kg

Bernard Raaf

Thomas Haustein

Wolfgang Zirwas

Egon Schulz

Juergen Michel

Rüdiger Halfmann

Josef Martin Eichinger

Gilberto Berardinelli

Yan Gao

Fernando Tavares

An apparatus (UEA) may generate a zero-tail signal to be transmitted in an LTE/LTE-A cell, by introducing time domain samples with zero power or very low power in specific positions of a time symbol tail. The apparatus (UEA) may transmit the generated zero-tail signal to a base station (eNB), such that a first user terminal (UEA) is located in the cell farther away (e.g. on a cell edge) from the base station (eNB) than a second user terminal (UEB). Thus coexistence of signals sent by user terminals (UEA, UEB) located at different distances from the base station (eNB) within a same receiver window is enabled without inter-symbol interference. The generated zero-tail signal may also be transmitted from the first user terminal (UEA) or from the base station (eNB) in an outdoor system that is detectable by a neighboring indoor system.

Zero insertion for ISI free OFDM reception

A method and a system for transmitting data by a transmitter over a channel having a predetermined channel quality estimate, comprises the steps of splitting (SP) input data stream (S, S, S) to be transmitted into a plurality of data sub-streams (S, S, S); processing (SYM, SYM, SYMj) each of the plurality of data sub-streams (S, S, S) into a plurality of symbol subsets (S, S, S) by selecting a certain scheme of coded-modulation (BPSK, QPSK, 16-QAM); processing, separately, each of the plurality of symbol subsets (S, S, S), via a plurality of separate Discrete Fourier Transforms (DFT, DFT, DFT), herein after denoted as DFTs, to obtain a plurality of DFT-precoded data sub-streams (S, S, S); allocating each DFT-precoded data sub-stream (S, S, S) in a frequency resource block (RB, RB, RB), via a sub-carrier mapping module (SCM), so that for each data sub-stream (S, S, S) the selected scheme of coded-modulation (BPSK, QPSK, 16-QAM) is chosen in dependence of the values of the channel quality estimate at the frequencies of its own allocated frequency resource block (RB, RB, RB).

Adaptive modulation and coding in a SC-FDMA system

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Neuried, Germany

Bernard Raaf