Method and device for allocating wireless resources of single carrier orthogonal frequency division multiplexing system

Abstract

The invention discloses a method for allocating wireless resources of a single carrier orthogonal frequency division multiplexing system. The method is carried out in each time slot and comprises the following steps of: acquiring a channel state index of each user on each wireless resource block of each time slot and sorting to obtain the superior-inferior sequence of channel indexes each resource block of each user; determining the allocation priority according to the bandwidth requirement of the user on the current time slot; allocating wireless resource blocks in the system to each user according to the sequence from high to low of the allocation priority and the principle; and allocating the optimal set of channel indexes of a central wireless resource block selected from allocable wireless resource blocks meeting the bandwidth requirement of the user to the user. The invention also discloses a device for allocating the wireless resources of the single carrier orthogonal frequency division multiplexing system. The invention can dynamically and self-adaptively adjust the wireless resources occupied by each user on each time slot, improve the throughout rate of total data of the system as much as possible and simultaneously reduce the complexity for realization.

Description

technical field [0001] The present invention relates to an orthogonal frequency division multiplexing system, in particular to a method and device for allocating wireless resources in a single carrier orthogonal frequency division multiplexing system. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology is a multi-carrier modulation technology, which divides the wireless spectrum into several orthogonal sub-carriers, and at the same time converts the user's high-speed data signal stream into several low-speed sub-data streams through serial parallel and modulated onto each subcarrier for transmission. Due to the orthogonality between the sub-carriers, the inter-interference (ICI) can be greatly reduced, and the utilization rate of the wireless spectrum can be improved. Single-carrier orthogonal frequency division multiplexing (SC-FDMA), developed on the basis of OFDM technology, has the advantage of low peak-to-average power ratio, and ...

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Problems solved by technology

[0009] In order to improve the utilization rate of the system, Verdu et al. proposed a water injection method that uses channel information to dynamically allocate subcarriers and carrier transmission power (IEEE Trans. Information Theory, 39(3): 773-785, May 1993.R.S.Cheng and S. Verd′u.Gaussian multiaccess channels with ISI: Capacity region and multiuser water-filling), this method can theoretically reach the Shannon limit of channel capacity; but this method needs to traverse all the allocation schemes supported by the system, and then Each traversed possible allocation method recalculates the user sub-channel index, and then performs multiple iterations. The overhead and complexity of the system are extremely high, so there is only theoretical value.

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