Siemens Aktiengesellschaft

Leo Rademacher

Hans W Rudolf

Zoran Gardijan

Mohamed Shaalan

An equalizer apparatus comprises a first filter () having a first respective plurality of filter coefficients, a channel model filter () having a plurality of model filter coefficients, and an adaptive algorithm unit (). The adaptive algorithm unit () is arranged to adapt at least a first predetermined number of the first respective plurality of filter coefficients and at least a second predetermined number of the plurality of model filter coefficients in response to an error signal (e) corresponding to a difference in filter output signals from the first filter and the channel model filters (). The adaptive algorithm unit () operates in accordance with a respective state channel estimation technique. The respective state channel estimation technique is adapted so as to reduce a number of states allocatable to at least one of the plurality of state-defining taps, thereby reducing an overall number of states definable associated with the plurality of state-defining taps. The channel model filter () is adapted a number of times corresponding to the reduced overall number of states.

Method and state reduction in an equalizer

A receiver recovers data for at least one of a plurality of users from radio signals generated by the plurality of users. The receiver includes data detectors, each of which is associated with one of a plurality of temporal displacements in communications paths through which the radio signals pass. Each of the data detectors estimates a user data symbol for one of the plurality of users from at least one of the radio signals. The receiver also includes a signal strength estimator to estimate signal strengths of the radio signals, and a receiver controller to assign user codes and the temporal displacements to each the plurality of data detectors according to the signal strengths of the radio signals. The receiver controller assigns a first user code for a first user to a first number of data detectors and a second user code for a second user to a second number of data detectors. The first number of data detectors has different temporal displacements than the second number of data detectors.

Receiver and method of recovering data from radio signals

A circuit arrangement for a mobile radio system has a base station and a non-adaptive antenna device. The base station has n outputs for n carrier-frequency signals which have essential the same frequency and amplitude. These n signals are adapted to the operation of a non-adaptive antenna device using devices for dividing and combining signals, if appropriate which perform phase correction.

System for a mobile radio system having a base station and an antenna device

A receiver for recovering data from received spread spectrum radio signals includes an equalizer, which mitigates at least some inter-symbol interference present in a sampled base band signal and which conditions the remaining inter-symbol interference such that the radio signals received via at least one propagation path are present in the conditioned remaining signals. The receiver also includes a symbol estimator coupled to the equalizer and configured to estimate the data by de-spreading the spread spectrum radio signals which correspond to the at least one propagation path with a corresponding spreading code. A communications system including the receiver for recovering data and a method of recovering data from spread spectrum signals are also provided.

Receiver and method for recovering data from spread spectrum radio signals

A method and apparatus for detecting items of information transmitted according to the DS-CDMA principle in a receiver apparatus. According to the invention, the detection of items of information transmitted according to the DS-CDMA principle ensues in a receiver apparatus in that, given the presence of the spread codes of at least two connections, the items of information related to the individual connections are separated in a first step, and an individual equalization of the items of information related to the individual connections ensues thereupon. The invention can be used advantageously in mobile radiotelephone terminal apparatuses and base stations that operate according to the CDMA principle.

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Holzkirchen, Germany

Leo Rademacher