Multi-antenna signal transmission method adopting time domain and frequency domain combined orthogonal frequency division multiplexing

Abstract

The invention relates to a time-frequency domain combining method for OFDM multi-antenna signal transmission, belonging to technology field of digital information transmission. First, original information produced by transmitting terminal is sequentially subject to source coding, channel coding, digital modulation, space-time coding and TFU-OFDM modulation; the modulated signal is transmitted through multi-antenna; the received signal is sequentially subject to TFU-OFDM demodulation, space-time decoding, digital demodulation, channel decoding, source decoding to acquire original information. The invention has merits that TFU-OFDM solves frequency selective fading and time selective fading problem arising from multipath transmission and Doppler frequency offset in broad band wireless mobile communication system; the MIMO technology with space diversity multiplexing characteristic promotes data transmission rate of communication system and spectrum effectiveness, enhances system capacity of communication system, promotes communication reliability.

Description

technical field [0001] The invention relates to a multi-antenna signal transmission method using time-frequency domain joint orthogonal frequency division multiplexing, which belongs to the technical field of digital information transmission. Background technique [0002] In wireless communication, all wireless technologies face the challenges of signal fading, channel multipath, increasing interference and limited spectrum. Multiple-input multiple-output multi-antenna system (hereinafter referred to as MIMO) uses multipath to provide higher data throughput without occupying additional radio frequencies, and at the same time increases the coverage of the communication system and improves the reliability of communication. sex. It solves two of the most difficult problems facing any radio technology today, namely data transmission rate and system capacity. Therefore, the MIMO system has become the key technology of the next generation wireless communication system. [0003]...

AI Technical Summary

Problems solved by technology

[0007] (2) Cells and sectors are not distinguished

[0008] (3) Poor adaptability to different system bandwidths

[0010] (5) Although TDS-OFDM is in a typical urban mobile environment, the moving speed is 60km / h and 180km / h, and the signal-to-noise ratio is greater than 5.3 and 5.8dB respectively, and the bit error rate can reach no more than 3×10 -6 , but when the number of FFT points, carrier spacing, PN length, etc. are changed, the support effect on mobility is unknown

[0011] (6) The number of FFT points is large

Cannot minimize computational complexity

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