A kind of OFDM communication method and system with uniform sub-band superposition

Abstract

The invention discloses an OFDM communication method and system with uniform subband superposition, and belongs to the technical field of wireless communication. The present invention divides the high-speed code stream into a lower-speed code stream through uniform sub-band division, thereby reducing the signal sampling rate; then each sub-band is convoluted with a polyphase multi-stage filter to reduce the band External attenuation improves the spectrum utilization rate of the entire system; finally, each sub-band performs corresponding spectrum shift and superposition, and transmits through the wireless channel, and the receiving end is the reverse process of the transmitting end. The technical effect brought by the implementation of the present invention is: through the uniform sub-band division, the signal sampling rate can be reduced, so that the order of the filter is reduced; when filtering, the calculation speed can be improved by adopting a multi-phase and multi-stage filtering method, Reduce computational complexity; by selecting an appropriate filter, the out-of-band attenuation of the signal is reduced, and the spectrum utilization rate is increased to about 99%.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to an OFDM (Orthogonal Frequency Division Multiplexing) communication technology with uniform subband superimposition. Background technique [0002] With the development of wireless communication and the Internet, wireless transmission data increases exponentially, and the performance and rate requirements for communication data transmission are getting higher and higher. In order to transmit more data, there are the following methods: first, increase the bandwidth of the channel, but in reality there is a shortage of spectrum resources, and the channel bandwidth cannot be increased indefinitely, so the current spectrum resources are difficult to meet the growing data, which has become the development trend of wireless communication. secondly, through the new waveform design method, the spectrum utilization rate is improved and the out-of-band attenuation is reduced...

AI Technical Summary

Problems solved by technology

However, if the entire channel bandwidth is directly filtered, the order of the filter used is relatively high, which makes the calculation complexity very high and increases the difficulty for hardware implementation.

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