Telefonaktiebolaget Lm Ericsson (publ)

Stefan Davidsson

Udo Wachsmann

Peter Schramm

Fabian Wenger

Ulf Peter Hansson

Mathias Pauli

Mikael Lindberg

Roger Walther

A radio receiver system () comprises a radio receiver (), a receiver sample clock (), which is used for sampling a modulated base-band signal; and a timing correction unit (). The timing correction unit () performs, in the frequency domain, a timing drift compensation between a transmitter sample clock () and the receiver sample clock (). In one example context of implementation, the plural modulated radio frequency carriers have been modulated using Orthogonal Frequency Division Multiplexing (OFDM).

Timing drift compensation in wireless packet-based systems

A semiconductor arrangement is provided for generating a predetermined time delay. Two clocks are connected to two parallel, redundant semi-conductor circuits emitting clock signals from multiplexers. The redundant circuits receive delayed clock signals from one of the clocks, and from the other clock, clock signals that are delayed in adjustable delay circuits to be phased in with the clock signals from the first clock. A number of delay elements and a first reference number of delay elements, providing a predetermined delay time, are connected in a reference delay circuit. A quotient of the two numbers is stored. One of the semi-conductor circuits is replaced by an alternative semi-conductor circuit, the reference delay circuit of which is set on the predetermined delay time, corresponding to a second reference number of delay elements. An adjustable delay circuit is set on the same delay time as the replaced semi-conductor circuit by means of the second reference number and the quotient.

Apparatus and method for generating a predetermined time delay in a semiconductor circuit

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Göteborg, Sweden

Stefan Davidsson