Abstract:
In an inter-cell interference relief method, a plurality of terminals are grouped into a plurality of groups. A base station transmits data to a first terminal belonging to a first group among the plurality of groups, without the help of a neighbouring base station. Additionally, the base station transmits data to a second terminal belonging to a second group among the plurality of groups, with the help of a neighbouring base station.
Abstract:
Disclosed is a technique for performing communication using ultrasonic waves in an environment in which radio waves are severely blocked and thus wireless communication is difficult to perform. According to the present invention, in an environment in which radio waves are severely blocked, a terminal using ultrasonic waves transmits ultrasonic waves via a solid structure serving as a medium, and a base station using ultrasonic waves receives ultrasonic waves via a solid structure serving as a medium.
Abstract:
An access point allocates a resource for ranging to an access terminal included therein, and receives a ranging channel that includes an identifier of the access terminal and a plurality of pilots. The AP checks the access terminal by using the received identifier, and measures a round trip delay of the access terminal based on the received pilots.
Abstract:
A retransmission method maps at least some bits of codeword to symbols according to a first modulation method at the time of first transmission. The retransmission method maps at least some bits of the codeword to symbols according to a second modulation method that is different from the first modulation method at the time of second transmission after the first transmission. In this case, the second modulation method may have a lower modulation order than that of the first modulation method, or a sum of average reliability per bit of symbol according to the second modulation may be larger than a sum of average reliability per bit of symbol according to the first modulation method.
Abstract:
The present invention relates to an apparatus and a method for selection of a precoding matrix. In the present invention, a precoding matrix to enable an effective signal-to-noise ratio (ESNR) to have a maximum value with respect to a signal vector that requires retransmission is selected in a codebook and fed back to a transmitter. Accordingly, since the effective signal-to-noise ratio has the maximum value after the signal vector is retransmitted, it is possible to minimize a reception error probability of retransmission.
Abstract:
A device for generating a transmission codebook in a communication system including a multi- input multi-output (MIMO) antenna according to an embodiment of the present invention includes: a frequency determiner that determines a frequency to allow the transmission codebook to have an optimal characteristic; a precoding matrix generator that generates a precoding matrix on the basis of the frequency; and a codebook generator that generates a retransmission codebook to be used for retransmission on the basis of the precoding matrix and generates the transmission codebook on the basis of the retransmission codebook.
Abstract:
In a symbol mapping method, transmission data is encoded to output information bits and re¬ dundancy bits. The information bits and the redundancy bits are mapped to a symbol according to a first mapping scheme at a first transmission, and the information bits and the redundancy bits are mapped to a symbol according to a second mapping scheme at a second transmission.
Abstract:
In a symbol mapping apparatus, a channel coder outputs a codeword including a plurality of information bits and a plurality of redundancy bits by encoding transmission data. A symbol mapper maps the codeword to the symbol while changing a mapping scheme in the unit of the codeword.
Abstract:
Bereitgestellt wird eine Vorrichtung zur Raumfilterung unter Verwendung eines Sendeverzögerungsunterschieds von Signalen und ein Verfahren für selbiges. Eine Scanvorrichtung kann einen Erstes-Signal-Erzeugungsteil, der ein erstes Signal erzeugt, einen Zweites-Signal-Erzeugungsteil, der ein zweites Signal erzeugt und einen Antwortempfangsteil, der eine Antwortnachricht basierend auf einem Ankunftszeitunterschied zwischen dem ersten Signal und dem zweiten Signal von der Gegenvorrichtung empfängt, umfassen. Damit kann die Scanvorrichtung Vorrichtungen, die in einer speziellen Richtung lokalisiert sind und Vorrichtungen, die in anderen Richtungen lokalisiert sind, unter Verwendung von einem Ankunftszeitunterschied der empfangenen Signale trennen.
Abstract:
Es werden ein Zufalls-Jitter-Strahlformungsverfahren zum Verringern des Einflusses einer Nebenkeule zum Verringern einer Strahlbreite und ein Sender und ein Empfänger, die dieses verwenden, geschaffen. Das Zufalls-Jitter-Strahlformungsverfahren enthält das Teilen einer Reihe von Binärfolgen zum Erzeugen mehrerer Bitgruppen, das Bestimmen einer Strahlcharakteristik, die jeder der Bitgruppen entspricht, aus einer Menge zweier oder mehrerer Strahlcharakteristiken mit demselben Gewinn und mit derselben Phase in einer Zielrichtung und das Formen eines Strahls mit der entsprechenden Strahlcharakteristik für jede der Bitgruppen.