Information transmission method for lowering peak to average power ratio of OFDM system signal

A peak-to-average power ratio and information transmission technology, which is applied in the direction of multi-frequency code system, etc., can solve the problems of increasing system bit error rate, reducing information transmission rate, occupying spectrum resources, etc.

Active Publication Date: 2010-07-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] It can be seen that although the partial transmission sequence method can effectively reduce the peak-to-average power ratio, it needs to send the phase rotation factor as sideband information, which makes: on the one hand, the transmission of sideband information occupies the precious spectrum resources of the s

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  • Information transmission method for lowering peak to average power ratio of OFDM system signal
  • Information transmission method for lowering peak to average power ratio of OFDM system signal
  • Information transmission method for lowering peak to average power ratio of OFDM system signal

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[0087]Specific parameter scheme: the number of subcarriers of the OFDM system is 256, and the modulation method is 16QAM. The numbers of subsequences are 4 and 8 respectively, the number of inserted pilot symbols is 32, and the value set of phase rotation factors S={1,-1}.

[0088] The simulation result shows: on the basis of not sending part of the transmission sequence sideband information, the bit error rate result obtained by the present invention is basically equal to the bit error rate result obtained when the partial transmission sequence method assumes that the sideband information is completely and correctly received, And it is not much different from the result of the bit error rate under the ideal state.

[0089] The invention not only can effectively reduce the peak-to-average power ratio of the OFDM signal, but also does not need to send part of the sideband information of the transmission sequence. For example: when the number of subsequences is 4, the reduction...

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Abstract

The invention discloses an information transmission method for lowering peak to average power ratio of an OFDM system signal. In the method of the invention, after being coded, weaved, modulated and performed with serial/parallel conversion, the input bit stream is adjacently cut into a plurality of mutually disjoint frequency domain subsequences; each subsequence is inserted with pilot frequency as required; parts of transmission sequences are used for lowering the peak to average power ratio without transmitting a phase rotation factor to a receiving end. At the receiving end, the received signal is performed with serial/parallel conversion, DFT and parallel/serial conversion and is cut into a frequency domain signal subsequence according to the same mode with a receiver end; pilot frequency contained in the subsequence is utilized for the channel estimation of the subsequence; the multiplied phase rotation factor serves as one part of channel frequency response so as to restore frequency domain data in the subsequence; the frequency domain ratio data are combined into one sequence; and an output bit stream is obtained after demodulating, deinterlearing and decoding. The invention eliminates the influence of sideband information on the frequency spectrum utilization ratio and signal transmission rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication using an Orthogonal Frequency Division Multiplexing (OFDM) system, and in particular relates to an information transmission method that combines segmental channel estimation and partial transmission sequences to reduce the peak-to-average power ratio of OFDM signals without sending sideband information . Background technique [0002] In the mobile wireless channel, the signal arrives at the receiving antenna through a time-varying multipath channel from the transmitting antenna, which will produce time-selective fading and frequency-selective fading. Orthogonal frequency division multiplexing (OFDM) technology divides the frequency domain into multiple sub-channels, and the orthogonal overlap between adjacent sub-channels improves the efficiency of spectrum utilization. It can be seen that on the one hand, this technology can overcome frequency selective fading. On the other hand, ...

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Application Information

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IPC IPC(8): H04L27/26
Inventor 江涛管丽丽周洋屈代明
Owner HUAZHONG UNIV OF SCI & TECH
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