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Real-time service resource distribution method of orthogonal frequency division multisystem

An orthogonal frequency division and resource allocation technology, applied in the field of resource allocation in OFDM communication systems, can solve problems such as increasing the real-time service packet loss rate, not considering the constraints of latency, and reducing system capacity.

Inactive Publication Date: 2010-01-13
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0003] A method of resource allocation mentioned in "International Conference on Communications, Volume 5, 2004, pp2949-2953", because it does not consider the constraints of the waiting delay of the packets in the user queue, thus increasing the real-time The packet loss rate of the business reduces the system capacity; in addition, this method assumes that the user queue length is infinite, but the actual system is always limited, which is far from this assumption

Method used

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  • Real-time service resource distribution method of orthogonal frequency division multisystem
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  • Real-time service resource distribution method of orthogonal frequency division multisystem

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Embodiment 1

[0033] In this embodiment, an OFDM transmission system with a bandwidth of 20 MHz and a number of data subcarriers of 512 is used. The channel adopts the COST207 six-path model, the maximum multipath delay is 10us, the six paths are distributed at equal intervals within 0-10us, and the power spectral density of each path meets the usual Jake model. The maximum Doppler deviation is 50Hz. Each frame consists of one OFDM symbol.

[0034] The business source model adopts ON-OFF two-state Markov process. The activation period and the silent period are independent of each other and obey the exponential distribution (Efficiency of packet reservation multiple access, IEEE Trans. on Veh. Technol., 1991, vol.40: 170-176. and Performance of PRMA: A packet voice protocol for cellular systems , IEEE Trans. on Veh. Technol., 1991, vol.40:584-598.). The transition probability from the active period to the silent period is γ=1-exp(-T f / t 1 ), the transition probability from silent perio...

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Abstract

This invention relates to a distribution method for real-time service resources of the OFDM system characterizing that a dispatch module divides a packet into multiple priorities and decides the packet dispatch sequence based on the feedback information, the channel states of users, queue state, demand on service quality and the head packet time delay of a power combined algorithm, sub-carriers and the power combined distribution module distribute sub-carriers for the packets of high priorities first, then distribute them for packets of low priorities based on the sequence result provided by the dispatch module, information of user channel state and packet numbers in the user queue and meeting the needs of certain error bit rate so as to reduce steps for distributing sub-carrier waves and the sub-carrier exchange unit is turned on if necessary to maintain the system volume and its release unit is turned on to minimize the packet drop-out rate.

Description

Technical field: [0001] The invention belongs to the technical field of Orthogonal Frequency Division Multiplexing (OFDM) mobile communication, and particularly relates to a resource allocation method in an OFDM communication system. Background technique: [0002] Traditional OFDM resource allocation research focuses on two aspects of bit allocation and power allocation, such as "International Institute of Electronics and Electrical Engineers Communication Topics Journal" (IEEE J. -1758), a multi-user adaptive subcarrier, bit and power allocation algorithm. Because these algorithms do not take into account the random characteristics of service arrival, user queue status, user requirements for Quality of Service (QoS), etc. during the allocation process, it is difficult to provide users with satisfactory services. [0003] A method of resource allocation mentioned in "International Conference on Communications, Volume 5, 2004, pp2949-2953", because it does not consider the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04L27/26
Inventor 侯华周武旸朱近康
Owner UNIV OF SCI & TECH OF CHINA
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