Agency for Science, Technology and Research

Yan Wu

Sumei Sun

Zhongding Lei

Chin Keong Ho

Ying Chang Liang

Ho Wang Fung

Yuan Li

Ping He

Peng Hui Tan

A transmitter () for transmitting a signal, the signal comprising a plurality of signal values, the signal values being grouped to at least one signal value block. The transmitter comprises a pre-transformation unit () adapted to process each signal value block by a pre-transformation to produce a block of modulation symbols, wherein the pre-transformation comprises a phase rotation of the signal block values, which corresponds to the multiplication of the signal value block with a phase rotation matrix. The transmitter also comprises a modulation unit () adapted to modulate at least one carrier signal based on the modulation symbols and a sending unit () adapted to send the modulated carrier signal.

Method for transmitting a digital signal, method for receiving a digital signal, transmitter and receiver

A method of determining a residual frequency offset between a transmitter and a receiver in a transmission of data via a communication channel, is described, wherein the message is transmitted from the transmitter to the receiver via the communication channel and the message comprises at least one short preamble (), at least one long preamble () and user data (). The at least one long preamble () comprises residual frequency offset determination information based on which the residual frequency offset is determined.

Method for determining a residual frequency offset, communication system, method for transmitting a message, transmitter, method for processing a message and receiver

A method for transmitting a digital signal is described, wherein the digital signal is to be transmitted by a plurality of antennas and a 2-domain pre-transformation is carried out, i.e., in course of a pre-transformation modulation symbols assigned to subcarriers having different frequencies and assigned to subcarriers sent by different antennas are linearly combined.

Method for transmitting a digital data stream, transmitter, method for receiving a digital data stream and receiver

A transmitter that has a determination unit for determining a plurality of symbols () such that each symbol () has a tail component () and the plurality is determined in such a way that the tail components () are substantially equal and a tone generation unit for arranging the plurality of symbols () to form a plurality of long preambles () such that the plurality of long preambles () are tone-interleaved.

Transmitter, method for generating a plurality of long preambles and communication device

A method for transmitting data comprising a plurality of bits is described wherein the data is mapped to a plurality of modulation symbols, each modulation symbol comprising at least one more significant bit and at least one less significant bit, at least one parity bit is generated for the plurality of bits and the plurality of bits are mapped to more significant bits of the plurality of modulation symbols and the at least one parity bit is mapped to at least one less significant bit of the plurality of modulation symbols.

Method for transmitting data, method for receiving data, transmitter, receiver, and computer program products

A method for detecting a signal received via a communication channel, the communication channel being affected by noise, is described, wherein the received signal is processed according to a filtering step (), the filtering step comprises multiplication of at least one component of the received signal with a filter coefficient and the filter coefficient comprises a noise variance offset which corresponds to the variance of the noise.

Method for detecting a signal, detector and computer program product

A signal reconstructing section (), a receiver having the signal reconstructing section (), a communication system having the receiver, and a method for reducing noise in a transformed signal having a plurality of signal components and using the signal reconstructing section () are described. The signal reconstructing section () of the receiver has a detector () for detecting the transformed signal, decision modules () each having an input () coupled to output () of the detector, and a reconstructing module () having inputs () respectively coupled to output () of the decision modules (). The reconstructing module () is adapted to reconstruct one or more subcarriers of the plurality of subcarriers a predetermined number of times to thereby form a noise-reduced transformed signal. Reconstruction of the one or more subcarriers is performed one at a time or two or more simultaneously.

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Singapore, Singapore

Yan Wu