A data transmitting method based on OFDM system

Abstract

A data transmission method based on an orthogonal frequency division multiplexing system, which is suitable for the orthogonal frequency division multiplexing system which pilot signals are distributed uniformly on frequency domain thereof, comprises following steps (1) the system distrubites data subcarriers to a plurality of resource blocks, the distrubition result makes each resource block hassame numbers of pilot symbols, and corresponding pilot symbols have fixed relative positions in each resource block; (2) the system distrubites resources in terms of a resource block, maps data on the resource block and sends out. By adopting the resource block distribution method of the invention, on transmitting terminals, a transmitter adopts a same mapping rule for different resource blocks; on receiving terminals, a receiver can adopt a same mapping rule and a channel establishment method, and difficulty of system scheduling resource also can be reduced.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a data transmission method of an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology converts a high-speed transmission data stream into a set of low-speed parallel transmission data streams, which greatly reduces the sensitivity of the system to the frequency selectivity of multipath fading channels, and the introduction of cyclic prefix , which further enhances the ability of the system to resist inter-symbol interference (ISI). In addition, the high bandwidth utilization rate and simple implementation make OFDM more and more widely used in the field of wireless communication. For example, WLAN system, WiMax system based on Orthogonal Frequency Division Multiple Access (OFDMA), etc. A system based on OFDM technology. Even in the beyond 3G (beyond 3-th generation) system, which...

AI Technical Summary

Problems solved by technology

However, in traditional resource allocation, it is generally only required to divide the number of data subcarriers by the number of data subcarriers of resource blocks to be an integer, without considering the influence of pilot subcarriers, which may cause the following problems: A. For the same size The number and position of pilot subcarriers in different resource blocks are different

[0005] It should be pointed out that the above-mentioned increased complexity does not bring additional gains. Therefore, when performing resource allocation, it is very necessary to fully consider the factors of pilot subcarriers in resource blocks and reduce the complexity of system implementation.

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