Patent ID: 8121021
Filing Date: 2012-02-21
Classification: H04L

Abstract:
1. A data transmission method for an orthogonal frequency division multiplexing system, comprising sending M, which is greater than 1, orthogonal frequency division multiplexing symbols included in each of data transmission units with different bandwidths, wherein, each of the data transmission units with different bandwidths sends two kinds of orthogonal frequency division multiplexing symbols with different cyclic prefix lengths: orthogonal frequency division multiplexing symbols with long cyclic prefixes and orthogonal frequency division multiplexing symbols with short cyclic prefixes, which are transmitted in the same sub-carrier; and the data transmission units with different bandwidths transmit an identical number of orthogonal frequency division multiplexing symbols with the long cyclic prefixes and an identical number of the orthogonal frequency division multiplexing symbols with the short cyclic prefixes; and wherein, the data transmission units with different bandwidths transmit the orthogonal frequency division multiplexing symbols with the long cyclic prefix at a first symbol position.