Lucent Technologies Inc.

Alcatel Lucent

Alcatel-Lucent USA Inc.

Frank Gerhard Ernst Obernosterer

Georg Fischer

Peter Christian Gunreben

Rainer Walter Bachl

Kumud Kumar Sanwal

Gerd Heinrich

The invention relates to a method for recovering a bit stream from a radio signal () received in a first receiving station (S) and at least one further receiving station (S, S), the method comprising the steps of: in each of the receiving stations (Sto S), demodulating the received radio signal () to form a demodulated data stream (B, B', B&#x2033;), transferring the at least one demodulated data stream (B&#x2032;, B&#x2033;) from the at least one further receiving station (S, S) to the first receiving station (S), in the first receiving station (S), generating a combined data stream from the demodulated data streams (B, B&#x2032;, B&#x2033;) of each of the receiving stations (Sto S), and performing a hard decision on the combined data stream for recovering the bit stream.

Method for recovering a bit stream from a radio signal

The present invention provides a method and an apparatus for measuring a reception quality on a wireless communication link to a receiver by removing a bias in a plurality of received pilot symbols and obtaining a channel estimate for a channel, such as a wireless propagation channel, after substantially removing the bias. For a receiver, such as a rake receiver disposed in a base transceiver station, a bias removal module may extract a plurality of coefficients from a wireless propagation channel to remove a bias before a detector may receive the plurality of pilot symbols in the data stream to determine an error rate of the received pilot symbols where channel estimation is based on the received pilot symbols. In this manner, a systematic flaw in a link quality measurement based on an error rate of the received pilot symbols may be resolved for wireless communication systems.

Removing bias in a pilot symbol error rate for receivers

A method of limiting at least one peak of a composite signal having multiple carriers signals involves placing energy in at least one bandwidth gap located between respective frequency bandwidths of carrier signals.

Device and method for reducing peaks of a composite signal

Improved frequency utilization in a radio network is achieved by using a radio system with a plurality of base stations, which respectively have at least one transmitter and one receiver, each base station being assigned at least one dual-polarized antenna. More efficient utilization of the available frequency band, and consequently a reduction in the cluster size, is made possible by the dual-polarized antenna being assigned a polarization modulator for changing at predetermined points in time the polarization state of a transmit signal to be transmitted.

Radio system, antenna arrangement and polarization modulator for generating a transmit signal with changing polarization

The invention relates to a method and a device for processing signals of a digital transmission system in general, and for estimating the frequency offset of the transmission system in particular. In one embodiment, the method according to the invention estimates the pulse response of the transmission system and shortens the pulse response by means of a variable prefilter. The duration of the shortened pulse response is, in particular, shorter than the duration of a known symbol sequence which is transmitted twice identically within one method cycle. By comparing samples of the received signal which correspond to the known identical symbols, the frequency offset is estimated reliably, and suitable measures can be taken to compensate it. Consequently, the efficiency of the receiver is substantially improved with respect to the recovery of the transmitted data. The invention can be used, in particular, for transmitting data in blocks, even when there is no freedom from inter-symbol interference, and even when the unshortened pulse response is longer than the known symbol sequence. Transmission using GSM/EDGE systems is one field of application.

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Bavaria, Germany

Frank Gerhard Ernst Obernosterer