Ntt Docomo, Inc.

Petra Weitkemper

Hidekazu Taoka

Katsutoshi Kusume

Satoshi Nagata

Mikio Iwamura

Guido Dietl

Jamal Bazzi

Ashiq Khan

Kusume Katsutoshi

Kozu Kazuyuki

Taoka Hidekazu

How to apply an Alamouti like space-time coding (or transmit diversity) to a Filter Bank Multicarrier (FBMC) transmission using Offset QAM (OQAM). In FBMC, due to the orthogonality in the real domain only, an intrinsic interference results thereof for the imaginary component. Simply adapting the Alamouti scheme to FBMC OQAM is not obvious since the intrinsic interference terms are not equivalent at each antenna since it depends on the surrounding symbols. The application proposes to use a precoding symbol chosen to cancel out (zero) the intrinsic interference individually for each antenna, ie a code rate of 1/2 (sending one data symbol requires two time units). A more elaborated embodiment proposes to choose the contiguous precoding symbols such that a virtual QAM Alamouti scheme is achieved, without rate loss.

Transmit diversity from orthogonal design for FBMC/OQAM

In a radio relay station, the channel quality of relay links is measured with the use of sounding reference signals from mobile terminals. Feedback information including the measurement results of the channel quality of the relay links is transmitted to a radio base station via a backhaul link. In the radio base station, the channel quality of the direct links is measured with the use of sounding reference signals from the mobile terminals. A correction value from the measurement results of the channel quality from the radio relay station is subtracted. Radio resources are allocated to a mobile terminal based on the measurement results of the channel quality of the direct links and the subtraction results.

Radio relay station, radio base station and radio communication method with channel quality measurement

An approach for resource allocation in a wireless communication network including a sender, a relay station and a receiver in case of a retransmission of information from the relay station to the receiver is described, wherein a resource necessary for retransmission is determined on the basis of the relayed channel and the relay function.

Method for resource allocation in a wireless communication network, method for error-free transmission of information, node and wireless communication network

The receiver includes a signal determiner, a soft information determiner and a soft information decoder. The signal determiner determines a complex receive value for the receive signal received from a relay station. Further, the soft information determiner obtains a soft information represented by a combination of a first probability value and a second probability value. The first probability value is derivable by adding a value depending on an overall probability density function for each symbol of a modulation alphabet including a same first bit value at a same bit position of the symbols, wherein each symbol of the modulation alphabet represents at least two bits. Further, the overall probability density function indicates a probability of receiving the complex receive value, if a signal representing the respective symbol s considered for adding was transmitted from a transmitter to a relay station, wherein the signal representing the respective symbol causes the receive signal received from the relay station. The second probability value is derivable by adding a value depending on the overall probability density function for each symbol of the modulation alphabet including a same second bit value at the same bit position of the symbols. Further, the soft information decoder decodes payload data contained by the receive signal based on the obtained soft information.

Receiver and method for decoding a receive signal in a wireless communication system

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Germering, Germany

Petra Weitkemper