A Method for Suppressing Phase Rotation Errors in Signals with High Data Transmission Efficiency

Abstract

The invention relates to an OFDM communication system and belongs to the communication field. A method for suppressing phase rotation errors in signals with high data transmission efficiency, characterized in that: subcarrier interleaving mapping is used, and the specific steps are step 1. The sequence generator at the transmitting end sends a group of subcarrier frequency domain sequence groups of N sequences , after the inverse fast Fourier transform, the time-domain sequence group is obtained; step 2, the time-domain sequence group is interleaved and mapped using rotational conjugation to obtain two subcarrier sequence groups of N sequences, and then the two sequence groups are divided into The bits are merged and added and sent to the receiving end; step 3, the receiving end performs Fourier transform on the received signal sequence group with noise and frequency offset, and then subtracts the adjacent subcarrier sequence signals to offset the ICI interference sequence , so as to eliminate the ICI interference and obtain the received sequence signal. By adopting the method of the invention, the phase rotation error in the signal can be further suppressed and the bit error rate performance of the system can be improved.

Description

technical field [0001] The invention relates to the technical field of OFDM, in particular to a method for suppressing phase rotation errors in signals with high data transmission efficiency in an OFDM communication system in a high-speed mobile channel environment. Background technique [0002] With the continuous improvement of the transmission rate of current wireless communication systems, inter-symbol interference (Inter-symbol Interference, ISI) and channel fading have become the main problems of traditional single-carrier systems. Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier modulation technology with high transmission rate, and its subcarriers are overlapped and orthogonal to each other so as to have a high spectrum utilization rate; at the same time, its Its long symbol period makes it have good ability to resist multipath fading and narrowband interference. Therefore, OFDM has become one of the key technologies of the fourth-gene...

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Problems solved by technology

[0009] However, after analyzing various current subcarrier mapping schemes, it is not difficult to find that: (1) most of the mapping schemes (for example: Scheme 1-Scheme 4) will cause the data transmission efficiency to be reduced to half of the original, and this is in some high-demand subcarriers. Data transmission rate communication scenarios are often not allowed; (2) Some mapping schemes (such as: scheme 5) can obtain better data transmission efficiency, but the scheme itself will also lead to a decrease in performance gain

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