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OFDMA system frequency time 2-D wire-less resource scheduling model and scheduling method

A wireless resource scheduling, system frequency technology, applied in the direction of orthogonal multiplexing system, electrical components, multiplexing communication, etc., can solve the problem of high throughput or spectrum efficiency, the system cannot obtain, and the fading channel is not considered Issues such as time domain variation

Inactive Publication Date: 2006-08-09
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, these current allocation methods consider resource allocation from the perspective of subcarriers (frequency domain), using the uncorrelation of fading between subcarriers and multi-user diversity, without considering the time domain variation of fading channels. At this time, the system High throughput or spectral efficiency cannot be achieved; if the time-domain change information of the fading channel can also be known at the sending end, it can be used to bring time diversity and corresponding multi-user diversity to further improve spectral efficiency (system capacity)

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  • OFDMA system frequency time 2-D wire-less resource scheduling model and scheduling method
  • OFDMA system frequency time 2-D wire-less resource scheduling model and scheduling method
  • OFDMA system frequency time 2-D wire-less resource scheduling model and scheduling method

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Embodiment Construction

[0075] In order to further understand the present invention, we carry out simulation analysis and verification below:

[0076] In the simulation, WSNR (Worst SNR) is used to represent the worst signal-to-noise ratio in the cell, which is defined as the signal-to-noise ratio (SNR) when the user is at the edge of the cell, and the influence of shadow fading and fast fading is not considered.

[0077] In order to facilitate the comparison between different methods, two scheduling methods of OFDM-TDMA and random allocation are also simulated in the scheduling of OFDMA frames: OFDM-TDMA scheduling method is to allocate time slots to different users, each user in a The entire frequency band is occupied in the time slot; and the random resource allocation is to assign frequency-time blocks to users randomly.

[0078] The resource scheduling performance of a downlink OFDMA cell is simulated in the 5GHz frequency band. The path loss factor is selected as n=4, the standard deviation of...

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Abstract

Analyzing issue of OFDMA system resource scheduling deeply, the invention discloses system model of frequency and time two dimensional dynamic resource scheduling and resource scheduling strategy based on OFDMA frame. The invention also discloses high performance method for scheduling two dimensional dynamic resource of frequency and time in OFDMA system, and converts optimization problem of linear programming to optimization problem of non-linear programming, which is further converted to simple two steps scheduling method so as to reduce scheduling complexity. Taking full advantage of fading characteristic in frequency domain and time domain in OFDM system, using capacity of wireless channel farthest, the invention reaches higher efficiency of frequency spectrum and system capacity.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to an OFDMA system frequency-time two-dimensional radio resource scheduling model and a scheduling method thereof. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing: Orthogonal Frequency Division Multiplexing) is a special multi-carrier transmission technology, which divides a wide transmission bandwidth into multiple orthogonal subcarriers for parallel data transmission. Of course, OFDM can also be regarded as a modulation technique or multiplexing technique. One of the biggest advantages of OFDM technology is to resist multipath fading. Since the entire transmission bandwidth is divided into multiple narrowband subcarriers, within each subcarrier, the signal can be regarded as flat fading. In a single-carrier modulation system, the fading of the channel will affect the entire signal bandwidth; however, in an OFDM multi-carrier modulation system,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J4/00H04J11/00
Inventor 张兴王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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