Abstract:
A method for transmitting signals over a power line network, wherein within the power line network at least one transmitter and at least one receiver communicate via at least two channels, each channel including a respective feeding port of at least one transmitter and the respective receiving port of the at least one transmitter and transmitter including at least two feeding ports. The method: determines a channel characteristic of each of the channels; applies a feeding port selection criterion based on the channel characteristic; and selects an excluded feeding port among the at least two feeding ports based on the feeding port selection criterion, wherein the excluded feeding port is not used during further communication. A corresponding power line communication modem can implement the method.
Abstract:
The present invention relates to a transmitting apparatus (54) for transmitting signals in a multi carrier system on the basis of a frame structure, each frame comprising at least two signaling patterns adjacent to each other in the frequency direction and at least one data pattern, said transmitting apparatus comprising frame forming means (59) adapted to arrange signaling data and pilot signals in each of said at least two signaling patterns in a frame, each signaling pattern having the same length, and to arrange data on frequency carriers of said at least one data pattern in a frame, transforming means (60) adapted to transform said signaling patterns and said data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means (61) adapted to transmit said time domain transmission signal. The present invention further relates to a corresponding transmitting method, a frame pattern for a multi carrier system and a receiving apparatus and method as well as a transmitting and receiving system and method.
Abstract:
The present invention relates to the fields of adaptive multi-carrier data transmission schemes. The present invention especially relates to a method of adapting transmission parameters of a group of subcarriers, a software program product and a communication device. The method of adapting transmission parameters of a group of subcarriers comprises steps of: determining a channel quality value for each subcarrier; establishing an order of assignment groups, each assignment group comprising one or more subcarriers, based on the channel quality values; assigning, in the order of the assignment groups, a transmission parameter to every assignment group, whereby assigning a transmission parameter to an assignment group comprises assigning the transmission parameter to all subcarriers of the assignment group; and calculating a link performance value based on previously assigned one or more transmission parameters; whereby the step of assigning a transmission parameter to every assignment group is based on the calculated link performance value.
Abstract:
A first wireless ad hoc network with a certain available amount of bandwidth comprises a plurality of wireless terminals communicating via wireless connections with each other. Each wireless connection requires a certain amount of the available amount of bandwidth. A problem occurs, if a wireless terminal wants to set up a new wireless connection requiring bandwidth or requires more bandwidth for an existing wireless connection and the required amount of bandwidth exceeds the left amount of the available amount of bandwidth of the first wireless ad hoc network. In a state of the art wireless ad hoc network the requested bandwidth cannot be provided and a user application may not be possible. According to the invention, however, the required amount of bandwidth can be provided by splitting the first wireless ad hoc network such that a second wireless ad hoc network is spawned which operates in a different communication channel and thus provides additional bandwidth. The second wireless ad hoc network comprises wireless terminals of the first wireless ad hoc network and/or new wireless terminals.
Abstract:
The present invention relates to transmit power allocation in multi-carrier, multiplexing MIMO communication systems. The present invention especially relates to a MIMO communication device, a method of assigning transmit power to two or more communication channels and a software program product. A multiple-input-multiple-output, MIMO, communication device according to the present invention comprises a link controller adapted to assign transmit power to two or more transmission channels, each of said transmission channels having preassigned a portion of transmit power for each of a group of subcarriers, said link controller being further adapted to assign, for each subcarrier of said group of subcarriers, at least part of the preassigned transmit power portion of a transmission channel that is not used for transmitting information at the subcarrier, to one or more transmission channels that are used for transmitting information at the subcarrier.
Abstract:
The present invention relates to a refinement of the Alamouti encoding scheme. The Alamouti scheme provides transmitting in a first period, the symbols S1 and S2 and in the next period the symbols—S2* and S1*, wherein S1* is the complex conjugate of S1. The symbols carrying the same information are transmitted on different paths to a receiver. If a disturbance occurs during the first period, the receiver may recover the symbol from symbol S1* in the second time period and vice versa. If no disturbance occurs, the receiver may use both symbols to further improve the transmission quality. An interleaver is provided to increase the transmission distance between redundant symbols, thereby causing the spread delay to be set to a value larger than the maximum length of typical channel disturbance in the communication channel.
Abstract:
The present invention relates to a transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame comprising at least one signalling pattern and one or more data patterns, said transmitting apparatus comprising frame forming means adapted to arrange first signalling data in said at least one signalling pattern in a frame, and adapted to arrange data in said one or more data patterns in a frame, whereby the data of said one or more data patterns comprise content data and sorting information enabling a sorting of the content data in the correct temporal order, transforming means adapted to transform said at least one signalling pattern and said one or more data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means adapted to transmit said time domain transmission signal.The invention further relates to a corresponding transmitting method and frame structure, as well as a corresponding receiving apparatus and method, and corresponding transmitting and receiving apparatus and method.
Abstract:
A method for transmitting a signal from a transmitter over a channel to a receiver on a Power Line Network, wherein said signal is OFDM-modulated on a set of sub-carriers, is proposed, wherein an OFDM tonemap and an eigenbeamforming encoding matrix are determined based on a channel estimation for each sub-carrier, a tonemap feedback signal and an eigenbeamforming feedback signal are generated, which are descriptive of said OFDM tonemap and said eigenbeamforming encoding matrix, respectively, and transmitted to the transmitter. A corresponding receiver, a transmitter, a power line communication and a power line communication system are described as well.
Abstract:
A method for transmitting a signal from a transmitter over a channel to a receiver on a Power Line Network, wherein said signal is OFDM-modulated on a set of sub-carriers, is proposed, wherein an OFDM tonemap and an eigenbeamforming encoding matrix are determined based on a channel estimation for each sub-carrier, a tonemap feedback signal and an eigenbeamforming feedback signal are generated, which are descriptive of said OFDM tonemap and said eigenbeamforming encoding matrix, respectively, and transmitted to the transmitter. A corresponding receiver, a transmitter, a power line communication and a power line communication system are described as well.
Abstract:
A device for bit-demultiplexing in a multicarrier MIMO communication system (e.g. precoded spatial multiplexing MIMO communication systems using adaptive OFDM), including a multicarrier MIMO transmitter and a multicarrier MIMO receiver. The multicarrier MIMO transmitter includes a demultiplexer and symbol mapper unit receiving an input bit stream and generating a plurality of symbol streams, each symbol stream being associated with a different transmission channel and including a plurality of data symbols, each data symbol being attributed to a different carrier; one or more multicarrier modulators generating at least two multicarrier modulated signals based on the symbol streams; and at least two transmit ports respectively transmitting the at least two multicarrier modulated signals, wherein a data throughput rate of each transmission channel is separately variable.