A method and device for determining the starting position of an OFDM symbol

Abstract

The invention discloses a method and device for determining a starting point position of an OFDM symbol. The method and device are used for improving the accuracy of symbol starting point positioningand improving the quality of user network experience. The method includes the steps that a receiving end determines the positions of starting points of lead codes in a received signal, wherein the lead codes includes long guide codes; the receiving end conducts cross-correlation operation on the received signal and K preset long guide codes included in a preset long guide code set to obtain K operation results, and the operation results are used for representing the positions of the long guide codes in the lead codes; the preset long guide code set is stored in the receiving end, and K is an integer of not less than 2; the receiving end determines the starting position of the OFDM symbol according to the positions of the starting points of the lead codes and the K operation results; the starting position of the OFDM symbol is the same as the starting points of the long guide codes.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and equipment for determining the start position of an Orthogonal Frequency Division Multiple (OFDM) symbol. Background technique [0002] At present, in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system, the communication bandwidth is divided into multiple sub-channels, and each sub-channel includes multiple sub-carriers, and then the sub-channel is used as a resource unit to allocate to multiple users. In this way, multiple user equipments can communicate at the same time, and through the orthogonality between subcarriers, a high degree of overlap of subcarriers is realized, which greatly improves spectrum utilization. Therefore, OFDMA communication systems are widely used. [0003] Due to the technical characteristics of OFDMA, multiple users occupy different subcarriers for communication in the frequency domain, but transmit...

AI Technical Summary

Problems solved by technology

[0008] However, in the OFDMA system, multiple users send signals at the same time. Due to the channel fading, transmit power and the position from the base station experienced by the signals of multiple users are different, the signal strength of each user's signal reaching the base station will be different, and the arrival time there are also differences

The current synchronization method is more susceptible to user signal strength interference during fine synchronization, and the positioning results are usually biased towards users with stronger signals, that is, the starting point of positioning symbols is biased towards the starting point of symbols of users with strong signals, which makes the signal weak The symbol positioning of users with weak signals is not accurate, and the signals of users with weak signals cannot be successfully decoded, so users with weak signals have poor network experience

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