Abstract:
PROBLEM TO BE SOLVED: To efficiently send data in a wireless communication system.SOLUTION: An output waveform comprises traffic and overhead segments, and code division multiplexing (CDM) or orthogonal frequency division multiplexing (OFDM) is selected for each traffic segment. Each traffic segment carries CDM data at a chip rate if CDM is selected, and carries OFDM data if OFDM is selected. OFDM symbols are generated at a sample rate that is an integer ratio of the chip rate, and have the duration determined based on the traffic segment duration. The output waveform carries CDM data and/or OFDM data on subcarriers corresponding to at least one carrier in a spectral allocation and further carries OFDM data on remaining usable subcarriers in the spectral allocation.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for receiving packets via H-ARQ transmissions with interference cancellation in a quasi-orthogonal communication system.SOLUTION: To receive packets with interference cancellation, block transmissions for the packets are received on time-frequency blocks used by these packets. Receiver spatial processing is performed on input symbols to obtain detected symbols. For each packet that is decoded correctly, the transmission for the packet is terminated, and the interference due to the packet is estimated. Receiver spatial processing is performed on the interference-canceled symbols to obtain new detected symbols for all time-frequency blocks used by all correctly decoded packets. Each packet decoded in error and overlapping at least partially with any correctly decoded packet may be demodulated and decoded based on all detected symbols available for that packet.
Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus and a method for enhancing performance in a wireless communication system using beamforming transmission.SOLUTION: The method can include determining channel information for a user, and assigning a user device to at least one of a wide beam or at least one predetermined narrow beam. Further, the method includes assigning another user device during the same time period to at least some overlapping frequencies and the other one of the wide beam and the at least one predetermined narrow beam as the user device. Moreover, the at least one predetermined narrow beam includes a cluster of narrow beams and another cluster of narrow beams. In this case, the first cluster and the another cluster do not overlap.
Abstract:
PROBLEM TO BE SOLVED: To support mobile stations incapable of demodulating the entire bandwidth or capable of demodulating a less bandwidth than the entire bandwidth.SOLUTION: Users are scheduled on a less bandwidth than the entire bandwidth. Further, a certain user can be scheduled on a more bandwidth than other users.
Abstract:
PROBLEM TO BE SOLVED: To control transmit power of terminals to reduce interference.SOLUTION: A terminal may send a first transmission (e.g., for pilot or signaling) on a reverse link, receive feedback (e.g., a power control command or an erasure indicator) for the first transmission, and adjust a reference power level based on the feedback. The terminal may also receive interference information and possible other parameters such as a pilot quality indicator (PQI), an offset factor, and a boost factor from a sector. The terminal may determine transmit power for a second transmission to the sector based on the interference information, the reference power level, and/or the other parameters. The terminal may receive the feedback from one sector and may send the second transmission with CDMA or OFDMA to the same sector or a different sector.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques to more efficiently transmit pilots on demand on a reverse link.SOLUTION: Pilots are transmitted on demand on a reverse link and used for channel estimation and data transmission on a forward link. A base station selects at least one terminal for on-demand pilot transmission on the reverse link (210). Each of the at least one selected terminal is a candidate for receiving data transmission on the forward link. The base station assigns each of the at least one selected terminal with a time-frequency allocation (212), which may be for a wideband pilot, a narrowband pilot, or some other type of pilot. The base station receives and processes an on-demand pilot transmitted from each of the at least one selected terminal (216) and derives a channel estimate for the terminal based on the received pilot (218).
Abstract:
PROBLEM TO BE SOLVED: To provide a pilot symbol pattern for a pilot symbol transmitted from a mobile station or a base station.SOLUTION: The wireless communication apparatus comprises: at least one antenna; a memory that stores at least one time selective pilot pattern designed for a time selective channel and at least one frequency selective pilot pattern designed for a frequency selective channel; and a processor coupled with the at least one antenna and the memory, the processor selecting one pilot pattern of the at least one time selective pilot pattern and the at least one frequency selective pilot pattern, and setting pilot symbols of the selected pilot pattern to locations close to the edges of the hop region in accordance with a first order term of a communication channel.
Abstract:
programação de sub-banda e ajuste de recuo de amplificador de potência. sistemas e metodologias são descritos facilitando o efeito de mitigação da distorção não linear de um amplificador de potencia em uma margem de máscara espectral. as indicações de limite de potência podem ser analisadas na programação dos dispositivos móveis. os dispositivos móveis com limites de potência podem ser programados nas sub-bandas internas. os limites de potência podem ser baseados pelo menos em parte na informação de headroom de amplificador de potência. outros dispositivos móveis podem empregar as partes restantes de um espectro alocado. adicionalmente, os dispositivos móveis podem avaliar e estabelecer um recuo de amplificador de potência com base na programação de sub-banda.
Abstract:
atribuição de recursos de link reverso e controle de potência de link reverso para sistemas de comunicação sem fio é provida a atribuição de densidade de espectro de potência para terminais de acesso em um ambiente de rede sem fio. são determinadas informações de atribuição que incluem a atribuição de recursos de transmissão do link reverso e é criada uma instrução de controle de potência para o recurso de transmissão de link reverso atribuído. uma mensagem de atribuição que inclui tanto as informações de atribuição quanto a instrução de controle de potência é formatada e comunicada aos terminais de acesso. a mensagem de atribuição inclui um campo de controle de potência de link reverso que indica uma densidade espectral de potência de transmissão atribuída pelo ponto de acesso para a transmissão de link reverso pelo terminal.
Abstract:
canais de sinalização variados para um link reverso em um sistema de comunicação sem fio. sinalização é eficientemente enviada em um segmento de controle cdma configurável. para enviar sinalização, parâmetros de transmissão para o segmento de controle cdma para um setor servidor são determinados. estes parâmetros podem indicar o tamanho de segmento de controle cdma, os quadros nos quais o segmento de controle cdma é enviado, os canais de sinalização a serem enviados no segmento de controle cdma, e assim por diante. os canais de sinalização cdma habilitados para um terminal e o intervalo de transmissão médio para cada canal de sinalização cdma habilitado são determinados. para cada quadro no qual o segmento de controle cdma é enviado, os canais de sinalização a serem enviados no segmento de controle cdma naquele quadro são determinados. a sinalização para cada canal de sinalização é processada (por ex., codificada, canalizada, graduada e embaralhada). a sinalização processada para todos os canais de sinalização é combinada e mapeada em uma região de tempo frequência usada para o segmento de controle cdma no quadro.