Koninklijke Philips Corporation N.v.

Alexei Gorokhov

Johan Paul Marie Gerard Linnartz

Antonius Adrianus Cornelis Maria Kalker

Johannes Wilhelmus Maria Bergmans

Franciscus Maria Joannes Willems

Described is a transmission system () for transmitting an information signal () via a plurality of subchannels from a transmitter () to a receiver (). The transmitter () first demultiplexes the information signal () into a plurality of information subsignals (). Next, the information subsignals () are encoded according to a code with certain properties, e.g. a maximum distance separable (MDS) code, and multiplexed. Finally, the resulting subsignals () are channel encoded and transmitted to the receiver (). The receiver () comprises a channel decoder () for successively channel decoding the received subsignals by incorporating decoding information () of already channel decoded information subsignals. Next, the resulting subsignals are demultiplexed, decoded according to said code and multiplexed into an output signal. Said code enables input symbols to be encoded into output symbols such that k input symbols of the k-th information subsignal are encoded with a k&#xd7;m-code into m output symbols, 1&#x2266;k&#x2266;m, said code having the following properties: all k input symbols and all m&#x2212;k other output symbols are determinable from any k output symbols, and no m&#x2212;l other output symbols are determinable from any l output symbols l.

Transmission system for transmitting an information signal via a plurality of subchannels from a transmitter to a receiver

Described is a transmission system () for transmitting an information signal () via a plurality of subchannels from a transmitter () to a receiver (). The transmitter () comprises a demultiplexer () for demultiplexing the information signal () into a plurality of information subsignals (). The transmitter () further comprises a channel encoder () for encoding the information subsignals () into encoded information subsignals (). Each encoded information subsignal () is transmitted via one of the subchannels to the receiver (). The receiver () comprises a channel decoder for successively decoding the received encoded information subsignals. The transmission system () is characterized in that the demultiplexer () is arranged for demultiplexing the information signal () into a plurality of partly overlapping information subsignals () comprising shared and non-shared information elements. For each subsignal () a distribution of the shared information elements is adapted to the throughput of the subchannels as ordered by the receiver (). The channel decoder is arranged for decoding a received encoded information subsignal by incorporating shared information elements of already decoded information subsignals. In this way, the transmission system can achieve a maximum througput.

MIMO transmission system in a radio communications network

Described is a transmission system for transmitting a multicarrier signal from a transmitter () to a receiver (). The multicarrier signal comprises a plurality of subcarriers. The receiver () comprises a channel estimator () for estimating amplitudes of the subcarriers and for estimating time derivatives of the amplitudes. The receiver () further comprises an equalizer () for canceling intercarrier interference included in the received multicarrier signal in dependence on the estimated amplitudes and derivatives (). The channel estimator () comprises a reduced complexity filter for deriving vectors of the estimated amplitudes and derivatives () from vectors of received symbols () and vectors of estimated symbols (). The reduced complexity filter may be arranged for exploiting an amplitude correlation between the amplitudes of different subcarriers and/or for exploiting a derivative correlation between the derivatives of different subcarriers.

Multicarrier transmission system with reduced complexity channel response estimation

Described is a transmission system for transmitting a multicarrier signal from a transmitter () to a receiver (). The multicarrier signal comprises a plurality of subcarriers. The receiver () comprises a channel estimator () for estimating amplitudes of the subcarriers and for estimating time derivatives of the amplitudes. The receiver () further comprises an equalizer () for canceling intercarrier interference included in the received multicarrier signal in dependence on the estimated amplitudes and derivatives (). The channel estimator () and/or the equalizer (24) are arranged for exploiting an amplitude correlation between the derivitives of different subcarriers. By making use of this correlation the complexity of the receiver () can be substantially reduced.

Multicarrier receiver with channel estimator

Described is a transmission system for transmitting a multicarrier signal from a transmitter () to a receiver (). The receiver () comprises an equalizer () for canceling intercarrier interference which may be included in the received multicarrier signal. The equalizer (), which preferably is a MMSE equalizer, comprises a reduced complexity filter for deriving a vector of estimated symbols () from a vector of received symbols (). The reduced complexity filter comprises a multiplication of an approximation of an inverse matrix Rwith the vector of received symbols (). The approximation of the inverse matrix Ris preferably a first order approximation.

Reduced complexity intercarrier interference cancellation

Described is a transmission system for transmitting a multicarrier signal from a transmitter () to a receiver (). The multicarrier signal comprises a plurality of subcarriers. The receiver () comprises a channel estimator () for estimating amplitudes of the subcarriers and for estimating time derivatives of the amplitudes. The receiver () further comprises an equalizer () for canceling intercarrier interference included in the received multicarrier signal in dependence on the estimated amplitudes and derivates (). The receiver () comprises a multiplication by a N&#xd7;N leakage matrix, and wherein the multiplication is implemented as a sequence of an N-point IFFT (), N pointwise multiplications () and an N-point FFT (). multiplications () and an N-point FFT ().

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Eindhoven, Netherlands

Alexei Gorokhov