Pilot spectrum design method based on channel quality in OFDM system

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] refer to figure 1 , a method for designing a pilot pattern based on channel quality in an OFDM system of the present invention is performed according to the following steps:

[0024] First, in the design of pilot insertion pattern, a pilot distribution method with periodic cyclic trapezoidal distribution is proposed. Each trapezoidal pilot distribution pattern is a group of pilots, and the pilot patterns are represented by a matrix. The number of rows of the matrix is ​​the number of OFDM symbols N, the number of columns is the number of sub-carriers M, and k is the number of adjacent pilots contained in each OFDM symbol. The initial value is k=2, and the value of k is based on the channel quality. The evaluation mechanism and pilot adjustment scheme are changed, and the pilot pattern H N×M Expressed as:

[0025]

[0026] Among them, 1