Signal transmission method for wideband wireless mobile commutation system

Abstract

The invention relates to a signal transmission method used in a broadband wireless mobile communication system, belonging to the technical field of digital information transmission. Firstly, source coding, channel coding and digital modulation are subsequently implemented on information which is generated by a sending terminal, and the modulated information is obtained; TFU-OFDM modulation is implemented on the modulated information, and a plurality of modulated symbols are combined into frame signals to be sent out; the received frame signals are separated into TFU-OFDM modulated symbols according to the corresponding combining mode; the TFU-OFDM demodulation is implemented on the modulated symbols to obtain serial data, and digital demodulation, channel decoding and source decoding are successively implemented on the serial data to obtain initial information. The advantage of fast synchronous speed of TDS-OFDM technology is maintained. And the estimation of the receiving terminal on the channel response is more accurate. Synchronization and channel estimation are separated, which is convenient for the modularization of the system. The processing efficiency of the system is improved. And the method is especially applied to the broadband wireless mobile communication system.

Description

technical field [0001] The invention relates to a signal transmission method used in a broadband wireless mobile communication system, belonging to the technical field of digital information transmission. Background technique [0002] The goal of broadband wireless mobile communication is to achieve high quality, high speed, and support multimedia transmission for high-speed mobile users. For this reason, the main difficulty is the frequency selective fading caused by the multipath effect of the channel, which is manifested as intersymbol interference in the time domain. [0003] The proposal of Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) technology provides a practical means to solve this problem. The main idea is: divide the channel into several orthogonal sub-channels in the frequency domain, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them on each sub-channel for transmission. The signal bandwi...

AI Technical Summary

Problems solved by technology

[0010] (2) Cells and sectors are not distinguished

[0011] (3) Poor adaptability to different system bandwidths

[0013] (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

[0014] (6) The number of FFT points is large

Cannot minimize computational complexity

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