Orthogonal frequency division multiple access system and method for wireless relay communication

Abstract

The invention relates to an orthogonal frequency division multiple access system and an orthogonal frequency division multiple access method for wireless relay communication. The system provided by the invention comprises a base station (BS), a relay station (RS) and a user terminal. The method mainly comprises the following steps of: setting a downlink relay zone and an uplink relay zone in a time division multiplexing (TDM) way in a downlink sub-frame and an uplink sub-frame of a physical layer frame structure of the BS respectively, setting a downlink relay zone in an uplink sub-frame of a physical layer frame structure of a frequency division duplexing (FDD) wireless receiver of the RS to define a relay sub-channel and orthogonal frequency division multiple access (OFDMA) symbol combinations for the reception of the RS from the downlink relay zone of the BS, and setting an uplink relay zone in a downlink sub-frame of a physical layer frame structure of an FDD wireless transmitter of the RS to define a relay sub-channel and OFDMA symbol combinations for the reception of the RS from the uplink relay zone of the BS; and performing the wireless relay communication among the BS, the RS and the user terminal in an FDD way based on the set uplink and downlink physical layer frames of the BS and the RS. By the system and the method, the single-FDD-wireless-transceiver-based relay communication of the RS can be realized in a communication system, the relay communication among the RS, the BS and the user terminal can be effectively ensured, and kinds of possible interference can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a wireless relay communication orthogonal frequency division multiplexing access system and method. Background technique [0002] IEEE 802.16 is the first broadband wireless access standard, which mainly includes two versions: one is the broadband fixed wireless access version 802.16-2004 of the 802.16 standard, and the other is the broadband mobile wireless access version 802.16e of the 802.16 standard. Only two network elements are defined in the 802.16-2004 standard, specifically BS (base station) and SS (subscriber station); in the 802.16e standard, only two network elements are also defined, specifically BS and MS (mobile subscriber station). stand). [0003] At present, the 802.16 Multihop Relay SG (802.16 Multihop Relay Research Group) only proposed the concept of RS (Relay Station) for WiMAX (Global Interoperability of Microwave Access). The relay communi...

AI Technical Summary

Problems solved by technology

[0011] The first is to divide the carrier into continuous groups, which is the simplest to implement, and the adjacent sub-channel interference is small, but the effect of frequency diversity obtained is poor

[0012] The second is that carriers of different sub-channels are interleaved in a regular manner. This frequency diversity effect is better, but the system is more sensitive to inter-sub-channel interference.

[0021] 1. RS needs to have two sets of FDD wireless transceivers, the structure is complex and the cost is high

[0022] 2. In the FDD communication mode, network system communication may exist such as Figure 4 Mutual interference of the 4 cases shown in (a)-(d)

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