OFDM-based cell user communication method and system thereof

Abstract

The present invention discloses a community users communication method based on the orthogonal frequency division multiplexing, including carrying out the grouping handling to users in each community in the orthogonal frequency division multiplexing mobile communication system; and making different groups users in the community occupy different time domain symbol resources to process the communication data transmission. Accordingly the present invention also discloses a community users communication system based on the orthogonal frequency division multiplexing. The present invention can reduce interference between users in one community and interference between communities in the mobile communication system.

Description

technical field [0001] The present invention relates to Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplex) technology in the field of mobile communication, in particular to a cell user communication method and system based on Orthogonal Frequency Division Multiplexing. Background technique [0002] At present, multi-carrier technology has become a hot technology in broadband wireless communication. Its basic idea is to divide a broadband carrier into multiple sub-carriers, and transmit data simultaneously on the divided multiple sub-carriers. Among them, Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplex) technology is a more representative technology among multi-carrier technologies. It divides a given channel into several orthogonal sub-channels in the frequency domain and allows sub-carriers The frequency spectrum partially overlaps, because as long as different subcarriers are mutually orthogo...

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Problems solved by technology

[0005] The first is to use different frequencies to carry data between adjacent cells, so as to avoid mutual interference between users in the cells, but this solution is due to the use of different frequencies between adjacent cells to carry data. , thus naturally reducing the frequency utilization;

[0006] The second is based on Code Division Multiple Access (CDMA) technology. All adjacent cells use the same frequency to carry data to obtain higher frequency utilization. Different mobile users use different random spread spectrum In this way, intra-cell user interference and inter-cell user interference are randomized through signal spreading, but this solution does not completely eliminate intra-cell user interference and inter-cell user interference, making the CDMA system Intra-cell user interference and inter-cell user interference still exist, resulting in limited user capacity in the CDMA system

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