User-defined OFDM (Orthogonal Frequency Division Multiplexing) transceiver

Abstract

The invention discloses a user-defined OFDM (Orthogonal Frequency Division Multiplexing) transceiver, which comprises a zero intermediate frequency transmitting and receiving channel and a digital signal processing module, wherein the zero intermediate frequency transmitting and receiving channel is used for carrying out up conversion on a base band I / Q (Input / Output) signal generated by the digital signal processing module and outputting after power amplification during emission, as well as receiving an OFDM signal and outputting the base band I / Q signal to the digital signal processing module after completing down conversion during reception; the digital signal processing module is used for carrying out carrier tracking, OFDM demodulation and data decoding according the base band I / Q signal collected by an A / D (Analog to Digital)converter and outputting data in a needed format to an upper computer during reception, as well as completing data coding and user-defined OFDM format generation according to data issued by the upper computer during emission. The user-defined OFDM transceiver has the advantages of high sensitivity, far transmission distance and strong timeliness and is suitable for wireless data transmission under the environment with high sensitivity with the transmission rate of 2 Mbps and complex terrain; the user-defined OFDM transceiver provides communication for equipment, such as an unmanned aerial vehicle, and provides a foundation for expanding the market of the unmanned aerial vehicle.

Description

technical field [0001] The invention relates to a self-defined OFDM transceiver device. Background technique [0002] In recent years, a multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, "OFDM") has attracted widespread attention. The multi-carrier transmission technology decomposes the data stream into several independent sub-data streams. When the total data transmission rate remains unchanged, each sub-data stream will have a much lower bit rate. Using the low-rate multi-state symbols formed at such a low bit rate to modulate the corresponding subcarriers constitutes a transmission system in which multiple low-rate symbols are sent in parallel. As a multi-carrier digital modulation technology, OFDM uses the data to be transmitted as frequency domain information, encodes the data and modulates it into a time domain signal for transmission in the frequency domain, and performs revers...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no OFDM transceiver equipment for 2Mbps on the market. Traditional OFDM is mainly DVB-T and WIFI; DVB-T is aimed at video data transmission with 8M bandwidth, and the sensitivity is not enough. Under the limited transmission power, the transmission distance is not enough; The delay of WIFI is too large, the real-time performance is not strong, and there are too many protocols

In summary, the traditional OFDM transceiver equipment has problems such as inappropriate rate, poor real-time performance, and transmission distance that does not meet the requirements.

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