Time division duplex transmission method for broadband wireless communication system

Abstract

The invention relates to a time division duplex transmission method for a broadband wireless communication system, belonging to the technical field of digital information transmission. The method comprises the following steps: using a time / frequency-domain unified orthogonal frequency division multiple access (TFU-OFDMA) technology to carry out downlink multiple access so as to obtain downlink signals at a transmitting end of a base station; using a time / frequency-domain unified single carrier multiple access (TFU-SCMA) technology to carry out uplink multiple access so as to obtain uplink signals at a transmitting end of user equipment; and using a time division duplex frame structure to carry out duplex transmission on the downlink signals and the uplink signals. The TFU-OFDMA technology provided by the invention solves the multiple access problems in the TFU-OFDM (Time / Frequency-domain Unified Orthogonal Frequency Division Multiplexing) modulation process, can flexibly allocate wireless resources and can effectively overcome deep fade, narrow-band interference and the like. The TFU-SCMA technology provided by the invention solves the multiple access problems in the improved SC-FDE (Single Carrier Frequency Domain Equalization) modulation process, reserves the advantages of low complexity of the transmitting end in the SC-FDE technology, low peak-to-average power ratio and the like, and enables the receiving end to be subject to synchronization and channel estimation better.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, in particular to a time division duplex transmission method in a broadband wireless communication system. Background technique [0002] The broadband wireless communication system can realize the duplex transmission of signals through the Time Division Duplexing (TDD) method, that is, the downlink (communication link transmitted from the base station to the user equipment) signal and the uplink (transmitted from the user equipment to the base station) signal. communication link) signals are transmitted on the same frequency band in two different time periods. [0003] Signal transmission in broadband wireless communication needs to overcome the problems of frequency selective fading and time selective fading caused by channel multipath effect and Doppler effect. The proposal of technologies such as Orthogonal Frequency Division Multiplexing (hereinafter referred to as OF...

AI Technical Summary

Problems solved by technology

This scheme can flexibly allocate wireless resources, well adapt to the different transmission rates of each user, and effectively resist deep fading and narrowband interference, but it is not conducive to fast time synchronization at the receiving end

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