Dynamic OFDM-FDMA systems under realistic assumptions: On the influence of channel knowlegde and inband signaling
نویسندگان
چکیده
Wireless OFDM systems offer the opportunity to transmit data simultaneously on the downlink of a cell to different wireless terminals by assigning different sets of subcarriers to different terminals. Due to the timeand frequency varying nature of subcarrier gains doing this dynamically has been shown to be beneficial in terms of various transmission metrics, i.e. average throughput, consumed power etc. . The potential of these dynamic subcarrier assignment schemes depends on two requirements. First, the access point has to “know” all subcarrier gains of all terminals in order to decide which terminals will receive which subcarrier. Second, after this decision has been made the terminals have to be informed of their assigned subcarrier sets. This task might be solved by a signaling system. So far, recent studies have always just assumed the existence of these two requirements without any cost. In this report we study the impact of explicitly implementing these two tasks in a dynamic assignment system, answering the question: which degree of advantage remains after considering realistic channel knowledge and an implemented signaling system.
منابع مشابه
On the effect of inband signaling and realistic channel knowledge on dynamic OFDM-FDMA systems
Dynamically assigning subcarriers of OFDM systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. However, the success of such a scheme depends on the ability of the access point to inform terminals of their newest subcarrier assignments as well as on the accuracy of the channel state information used to generate new assignme...
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In this study we investigate the performance of dynamic OFDM-FDMA systems including the cost of signaling. As dynamic OFDM-FDMA systems assign system resources (= sub-carriers, modulation types, power) periodically to different terminals, changing these assignments for the down-link data transmission require the access point to inform terminals about their new resource assignments. Hence, in or...
متن کاملA study of impact of inband signaling and realistic channel knowledge for an example dynamic OFDM-FDMA system
Dynamically assigning sub-carriers of OFDM systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. The success of such a scheme, however, depends on the ability of the access point to inform terminals of their newest subcarrier assignments as well as on the accuracy of the channel state information used to generate new assign...
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Dynamically assigning subcarriers to terminals in an OFDM-FDMA system optimizes various performance metrics. However, it also requires that terminals are periodically informed about their assigned subcarriers. Hence, the signaling overhead has to be taken into account for both system design and performance evaluation. We investigate two possibilities how to design an inband signaling system, wi...
متن کاملA study of impact of inband signalling and realistic channel knowledge for an example dynamic OFDM-FDMA system
Dynamically assigning sub-carriers of orthogonal frequency division multiplexing (OFDM) systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. The success of such a scheme, however depends on the ability of the access point to inform terminals of their newest sub-carrier assignments as well as on the accuracy of the channel ...
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