Telefonaktiebolaget Lm Ericsson (Publ)

Uwe Dettmar

Udo Wachsmann

Peter Schramm

Fabian Wenger

Hui Li

G&ouml;ran Malmgren

Jamshid Khun-Jush

J&ouml;rn Thielecke

Kirsten Matheus

A method and a device of providing timing information within a wireless communication system is described. The timing information is extracted from a received transmit signal. The inventive method comprises the steps of providing a training signal on the receiver side relating to a known signal portion of the transmit signal, scaling the training signal, quantizing the scaled training signal, correlating one or more parts of the received transmit signal with the scaled training signal to obtain one or more correlation results, and determining the timing information on the basis of the correlation results.

Method and device for providing timing information in a wireless communication system

A frequency tracking device (FTD) in particular for use in a OFDM communication system comprises a selector (SEL) which selects on the basis of N channel coefficients (C) a number M of subcarriers corresponding to the M channel coefficients (C) having the largest absolute values. An evaluator (EVAL) of the frequency tracking device (FTD) determines a frequency deviation estimate (f) on the basis of the selected M subcarriers and the selected M channel coefficients. In addition to or instead of a feedback correction unit (CORR) provided upstream of a multi-carrier filter bank (; FFT), the frequency tracking device (FTD) can also comprise a feed forward correction unit (CORR) provided downstream of the receiver multi-carrier filter bank (). In this case the selector (SEL) and the feed forward correction unit (CORR) operate on the same data symbols such that the correction unit (CORR) corrects the same data symbols which are subject to the selection and evaluation process in the selector (SEL) and the evaluator (EVAL). Based on the selection and evaluation processes frequency deviations (f) which are introduced into multi-carrier symbols when being transmitted between a transmitter multi-carrier filter bank (; IFFT) and a receiver multi-carrier filter bank (; FFT) can be corrected more efficiently, e.g. with a reduced computational complexity.

Frequency tracking device for a receiver of a multi-carrier communication system

A TDMA/TDD link adaptation method determines radio link quality at a base station. The radio link quality is used to update and broadcast a physical layer parameter indicator (10-16) from the base station on a broadcast control channel having a common physical layer parameter indicator for all uplink and downlink channels.

Link and radio cell adaptation in TDD systems

Growing community of inventors

Bornheim, Germany

Uwe Dettmar