Wireless transmission method for TDD OFDM system and physical layer frame structure

Abstract

The invention discloses a wireless communication method of a TDD OFDM wireless communication system, and a physical layer frame structure for realizing the communication method. The physical layer frame is divided into two sub-frames with the same duration and structure, each sub-frame comprises a plurality of regular service time slots and two guard periods (i.e. a first guard period and a second guard period). During conducing wireless transmission, each sub-frame sends a downlink service control message by using a regular time slot, receives uplink service by using one or more regular time slots after pausing for a period of time, and sends downlink service by using one or more regular time slots after pausing for a period of time. By using the provided physical layer frame structure, the time slot resources can be flexibly adjusted according to the specific statues of the uplink service and the downlink service during transmission, thereby improving the utilization ratio of system resources; and the allocation of the first guard period and the second guard period inhibit the interference between the uplink signals ant the downlink signals.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a wireless transmission method and a physical layer frame structure of a Time Division Duplex (TDD) Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) communication system. Background technique [0002] The physical layer frame structure is the basis of any communication system, that is, each communication system contains its own unique physical layer frame structure. During the design process of the physical layer, it is necessary to fully consider and weigh the resource utilization rate of the communication system (such as spectrum efficiency, etc.), multiple access (access) methods, key technologies of the physical layer, and implementation feasibility. [0003] TD-SCDMA (Time Division-Synchronized Code Division Multiple Access, Time Division-Synchronized Code Division Multiple Access) is one of the third-genera...

AI Technical Summary

Problems solved by technology

Although the GP length can meet most application scenarios, according to the field test results, it can be found that in a specific same-frequency networking environment, such as a relatively open environment, a basin, etc., and the approximate line-of-sight propagation environment between cells, then adjacent cells, more distant The direct or multiple reflected downlink signals of the cell may still cause serious interference to the uplink signal of the cell, affecting the overall performance of the system

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