Self-adapting pilot frequency dispensing device and self-adapting pilot frequency dispensing method in OFDMA system

Abstract

The invention provides a self-adapting pilot frequency dispensing device and a self-adapting pilot frequency dispensing method in an OFDMA system. A transmitting end comprises a pilot frequency configuration determination module, a pilot frequency power determination module and a pilot frequency dispenser, wherein the pilot frequency configuration determination module is used for selecting corresponding pilot frequency configurations from preset pilot frequency configurations and sending the corresponding pilot frequency configurations to the pilot frequency dispenser according to the speed grade of a terminal and channel condition; the pilot frequency power determination module is used for determining a corresponding pilot frequency power according to the distance between the terminal and the transmitting end and sending the corresponding pilot frequency power to the pilot frequency dispenser; and the pilot frequency dispenser is used for carrying out pilot frequency distribution adaptively for different terminals according to the related information sent by the pilot frequency configuration determination module and the pilot frequency power determination module. The device and the method give comprehensive consideration to the self-adaptation of the pilot frequency configuration and the pilot frequency power, reduce the consumption of the pilot frequency power, and improve the estimated performance of a whole channel.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an adaptive pilot allocation device and method in an OFDMA system. Background technique [0002] Orthogonal Frequency Division Multiplexing Access (OFDM) technology and Multiple-Input Multiple-Out-put (MIMO) technology are Beyond Third Generation (B3G) systems and the first The mainstream technology adopted in the evolution process of the fourth generation system (Forth Generation, 4G). The MIMO-OFDM system combining the two technologies has both advantages. Among them, MIMO technology can effectively increase the capacity of the system, improve the performance of the system, and can also significantly improve the coverage of the network and the reliability of transmission; Characteristics such as sexual fading and high spectrum utilization have received widespread attention. The MIMO-OFDM system decomposes the frequency selective fading channel into a group of parallel fla...

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Problems solved by technology

[0005] Among them, the Chinese patent application No. 03800406.2 has the following disadvantages: in this patent, the adaptive selection of the pilot configuration is compared with the preset threshold, but the determination of the threshold is difficult, and the patent does not give specific information. Determination basis, in the pilot adaptation process, only the adaptation of the pilot configuration is considered, and the adaptation of the pilot power is not considered

[0006] No. 200410088876.2 Chinese patent application has the following deficiencies: In this patent, although the basis and implementation of pilot frequency adaptation are given, the adaptation of pilot frequency power is not considered

[0007] Chinese patent application No. 200580031388.0 has the following deficiencies: the pilot adaptive allocation method proposed in this patent is only applicable to 802.11 systems, the application range has certain limitations, and the adaptive pilot configuration is not considered

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