Method and device for realizing remote ranging detection

Abstract

The invention provides a method and an apparatus for implementing long-distance ranging detection, the method including: a base station receiving two continuous OFDM (orthogonal frequency division multiplexing) signals of a mobile station, eliminating prefixes of the two OFDM signals respectively to obtain a first OFDM symbol and a second OFDM symbol; performing a fast Fourier transform respectively for the first OFDM symbol and the second OFDM symbol to obtain a first OFDM symbol carrier sequence and a second OFDM symbol carrier sequence; performing an operation on the second OFDM symbol carrier sequence and detecting whether a ranging symbol is included in the second OFDM symbol, if yes, performing an operation on the first OFDM symbol carrier sequence to eliminate phase ambiguity, or else, ending the ranging detection. The invention eliminates the phase ambiguity in the meantime of implementing the long-distance detection; and, the calculation complexity is reduced since the calculation for the first OFDM symbol is based on the detecting result of the second OFDM symbol.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for realizing long-distance ranging detection. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) is a multi-carrier transmission technology. In recent years, OFDM has been widely used, especially in the field of mobile communication. OFDM is considered to be a very promising key technology, and it has become one of the physical layer technologies of the IEEE 802.16 protocol. [0003] In the OFDM system of the IEEE802.16e protocol, the uplink synchronization between the mobile station and the base station is completed through ranging detection. The current detection method of ranging is mainly for the detection of a single ranging symbol, but the detection method of a single ranging symbol cannot meet the needs of the mobile station. For long-distance access requirements, when the...

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Problems solved by technology

[0005] For the method provided by the IEEE 802.16e protocol, if the base station only detects a single symbol, it cannot distinguish which ranging symbol is received, resulting in phase ambiguity; if two symbols are detected at the same time, the phase ambiguity problem can be eliminated, but In this way, not only the cost of system implementation is high, but also the response time of the system is affected.

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