Abstract:
A system and method for Interference Cancellation (IC). One aspect relates to iterative interference cancellation with iterative finger delay adaptation. The interference cancellation method comprises receiving multi-paths of a signal; and performing iterative interference cancellation to remove multi-path interference, wherein the performing iterative IC comprises estimating a Signal-to-Interference-plus-Noise Ratio (SINR) at each of a plurality of pre-determined rake receiver finger delays, and performing successive Channel Estimation (CE) and IC on rake receiver fingers according to their estimated SINRs, and wherein the CE of a next finger does not start until interference of a previous finger is removed from a sample buffer. The method may further comprise improving estimated rake receiver finger delay, and each iteration decreases the amount of interference observed by each finger.
Abstract:
A base station simulcast controller module apparatus (1402) is adapt ed to send a message to a base station controller (1406) to direct the base station controller (1406) to send downlink packets across each of a plurality of base stations (1404A 1404B and 1404C) for simul cast with a common sector identity ID. One or more simulcasting con trol instructions may be sent to the plurality of base stations (1404A 1404B and 1404C) to facilitate simulcasting with the sector ID from the plurality of base stations (1404A 1404B and 1404C).
Abstract:
Un procedimiento (800) para la formación de haces distribuidos basándose en la portadora y en la interferencia causada, el procedimiento que se implementa por una estación base de una pluralidad de estaciones base, cada estación base que sirve a un solo usuario, el procedimiento que comprende: recibir (802) información de estado de canal desde los usuarios; determinar (804) un vector de formación de haz de transmisión basándose en la maximización de una función de utilidad M(wi) que comprende una relación de la señal a interferencia causada más ruido, en el que cada estación base determina por separado el vector de formación del haz de transmisión para su usuario; y utilizar (806) el vector de formación de haz de transmisión para formación de haz; y en el que la interferencia causada a cada usuario se escala por uno o más factores de ponderación α, en el que la escala se produce como:**Fórmula** en el que wi indica el vector de formación de haz de transmisión, hii, hij indican coeficientes de canal, Pi indica la restricción de potencia para la estación base i.
Abstract:
Base stations may include a plurality of antenna ports adapted to communicatively couple to respective remote antenna units. A base station simulcast controller module may be coupled with each antenna port and may be adapted to transmit downlink transmissions over a plurality of remote antenna units with two or more of the remote antenna units simulcasting downlink transmissions as a simulcasting group. In response to one or more obtained network traffic parameters the base station simulcast controller module may modify the simulcasting group to include at least one different remote antenna unit. Methods operational on base station may include transmitting downlink transmissions over a plurality of remote antenna units where two or more of the remote antenna units form a simulcasting group. The simulcasting group can be modified to include at least one different remote antenna unit in response to one or more obtained network traffic parameters.
Abstract:
An RF connection matrix may include first and second carrier specific RF connection matrix modules. The first carrier specific RF connection matrix module can be adapted to route a first downlink transmission to one or more remote antenna units for transmission on a first carrier. The second carrier specific RF connection matrix module can be adapted to route a second downlink transmission to one or more remote antenna units for transmission on a second carrier. Methods for facilitating simulcasting and de simulcasting may include receiving a signal associated with a sector ID which signal includes a first downlink transmission for a first carrier and a second downlink transmission for a second carrier. The first downlink transmission can be routed to one or more remote antenna units for transmission on the first carrier. The second downlink transmission can be routed to one or more remote antenna units for transmission on the second carrier.
Abstract:
Distributed antenna systems (DASs) can include a plurality of spatially separated remote antenna units. According to at least one example, a first group of remote antenna units can simulcast downlink transmissions on a first carrier with a particular sector identity (ID). A second group of remote antenna units, including at least one different remote antenna unit from the first group, can simulcast downlink transmissions on a second carrier with the same sector ID. According to at least one other example, two or more remote antenna units which include respective coverage areas that are non-adjacent to one another can be employed to simulcast downlink transmissions.
Abstract:
A method, an apparatus, and a computer program product are provided. The apparatus may be configured to establish a first call for a first subscription, and accept a second call for a second subscription while maintaining the first call. A single RF transmit chain may be scheduled for uplink transmissions associated with the first call and uplink transmissions associated with the second call. A timesharing schedule for the transmit chain may determine timing for the uplink transmissions associated with the first call is transmitted and when the uplink transmissions associated with the second call is transmitted on the transmit chain. Downlink transmissions associated with the first and second calls may be received using different receive chain. Downlink transmissions associated with the first and second calls may be received using the same receive chain.
Abstract:
A method, an apparatus, and a computer program product are provided. The apparatus may be configured to establish a first call for a first subscription, and accept a second call for a second subscription while maintaining the first call. A single transmit chain may be used to transmit uplink traffic associated with the first call and uplink traffic associated with the second call. A timesharing schedule for the transmit chain may determine when the uplink traffic associated with the first call is transmitted and when the uplink traffic associated with the second call is transmitted on the transmit chain. Downlink traffic associated with the first and second calls may be received using different receive chain. Downlink traffic associated with the first and second calls may be received using the same receive chain.