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Correction method for phase noise of multi-antenna OFDM system receiving terminal

A technology of orthogonal frequency division and correction method, applied in multi-frequency code systems, multi-carrier systems and other directions, can solve problems such as affecting system performance and large phase noise

Inactive Publication Date: 2009-07-08
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

In addition, higher system bandwidth requires higher center frequencies, and higher RF frequencies introduce greater phase noise, further affecting system performance

Method used

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  • Correction method for phase noise of multi-antenna OFDM system receiving terminal
  • Correction method for phase noise of multi-antenna OFDM system receiving terminal
  • Correction method for phase noise of multi-antenna OFDM system receiving terminal

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Embodiment Construction

[0058] The receiving end phase noise correction method of multi-antenna OFDM system proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0059] (1) The transmitting end of the multi-antenna OFDM system, in the process of sending data, places a pilot OFDM symbol in the data OFDM symbol with a set interval, and the data is Subcarriers whose data is not zero in OFDM symbols and pilot OFDM symbols are effective subcarriers;

[0060] (2) The mth antenna of the above-mentioned transmitting end selects n effective sub-carriers to place pilots among the N effective sub-carriers of each pilot-OFDM symbol, and places the effective sub-carriers after the pilots to record for p 1 ,p 2 ,...,p n , where the pth i Pilot P(p i )for

[0061]

[0062] Among them, Z p is a set positive integer that is relatively prime to N;

[0063] (3) The mth antenna of the above-mentioned sending end selects s ​​effective sub-carriers amo...

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Abstract

The invention relates to a correction method of phase noise at a multi-antennae Orthogonal Frequency Division Multiplexing (OFDM) system receiving end belonging to the wireless data-transmission field. The method places a pilot OFDM symbol every a plurality of data OFDM symbols. In the pilot symbols, the receiving end obtains a channel matrix of the current symbol as a reference channel matrix of subsequent data symbols according to a receiving signal on a pilot sub-carrier and the receiving end pilot. In the data symbols, the receiving end obtains the channel matrix of the current symbol according to the receiving signal on the pilot sub-carrier and a reservation signal at the receiving end and obtains a united matrix of a transceiving phase noise mean values by comparing the channel matrix with that of the pilot symbol. According to an estimate value of the transceiving phase noise mean values which are separated from the united matrix, a detection matrix is adjusted. The method can simultaneous estimate and correct the phase noise of the transmitting and receiving antennas, and improve the system performance.

Description

technical field [0001] The invention relates to a method for correcting phase noise at a receiving end of a multi-antenna orthogonal frequency division multiplexing system, belonging to the field of wireless data transmission. Background technique [0002] Next-generation wireless communications require support for higher data rates and spectral efficiency. Adopting a multi-antenna technology (hereinafter referred to as MIMO) and a modulation method with high spectrum efficiency, such as Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM), is an effective method to obtain a high-speed transmission rate. In the MIMO-OFDM system, the phase noise of the transmitting antenna and the receiving antenna will not only cause the common phase deflection of all subcarriers in an OFDM symbol, but also cause each subcarrier to suffer from the intersubcarrier crosstalk of other subcarriers. Especially in today's situation where the demand for data rate is getting...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/38
Inventor 周世东张秀军许鹏肖元章王京肖立民周春晖李云洲杨海斌
Owner TSINGHUA UNIV
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