Symbol interleaving method

Abstract

The invention discloses a symbol interleaving method. The symbol interleaving method includes the steps that after current data needing to be transmitted to user equipment are converted into symbol sequences, the symbol sequences are sequentially written into a matrix by columns to obtain an initial matrix, wherein the row number R of the initial matrix is an OFDM symbolic number Nsymbol corresponding to the symbol sequences, and the column number C of the initial matrix is the product of the number Ncarrier of subcarriers occupied by OFDM symbols and the number Nsubs of sub-bands occupied by the symbol sequences; according to the formula: P(j)=P1(j, Ncarrier, Nsubs)+P2(j, Ncarrier), column permutation is carried out on the initial matrix to obtain a column permutation matrix, wherein P(j) is the column number of the j column, in the initial matrix, of the column permutation matrix, P1(j, Ncarrier, Nsubs)=pi (mod (j, Ncarrier)) * Nsubs, pi() is a preset permutation function, P2(j, Ncarrier) meets a formula (please see the formula in the specification), and according to a formula (please see the formula in the specification), permutation is carried out on the column permutation matrix to obtain an interleaved matrix, wherein Q(i) is the row number of the i row, in the column permutation matrix, of the interleaved matrix; symbols in the interleaved matrix are sequentially output by rows to obtain interleaved symbol sequences. The symbol interleaving method is suitable for the LTE 230 system.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a symbol interleaving method. Background technique [0002] The authorized frequency points of the power communication network are discretely distributed in the frequency band of 223.525MHz to 231.65MHz, a total of 40, each with a bandwidth of 25KHz, called physical sub-bands. The logical subbands correspond to the physical subbands 223.525 MHz to 231.65 MHz one by one. Each logical subband adopts SC-OFDM as the basic technology to carry effective information. Each radio frame of a subband is divided into an uplink time slot and a downlink time slot. An uplink time slot has 23 SC-OFDM symbols, three of which are demodulation reference symbols, and 20 data symbols, each of which has 10 valid subcarriers. [0003] On a variable parameter channel such as land mobile communication, a long-lasting deep fading valley point will affect a series of bits, so that bit errors of...

AI Technical Summary

Problems solved by technology

If certain subbands or several consecutive SC-OFDMs are interfered by a multi-subband user, according to the current design and resource mapping method without channel interleaving, a large amount of data in a code block may be interfered, resulting in this code block could not decode correctly

[0005] Due to the different channel propagation characteristics of the 230MHz frequency band 3G and 4G frequency bands, and the size of the code block, the number of subcarriers and the number of OFDM symbols in a transport block (TB) are also different from other systems, the traditional interleaving method cannot be directly applied to the LTE230 system middle

An interleaving method suitable for LTE230 systems supporting multiple subband users has not yet been proposed

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