Method for reducing peak-to-average power ratio of multiple input multiple output (MIMO) - orthogonal frequency division multiplexing (OFDM) signal for space-frequency coding

A technology of MIMO-OFDM and peak-to-average power ratio, which is applied in the field of wireless and wired communication, and can solve the problems of reducing peak-to-average power ratio and high complexity of MIMO-OFDM

Active Publication Date: 2011-05-25
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] For the high peak-to-average power ratio of space-frequency coded MIMO-OFDM signals, the existing methods of controlling and reducing the peak-to-average power ratio of OFDM signals are directly applied to coded MIMO-OFDM, which has the disadvantages of high complexity and the need to send sideband information , the

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  • Method for reducing peak-to-average power ratio of multiple input multiple output (MIMO) - orthogonal frequency division multiplexing (OFDM) signal for space-frequency coding
  • Method for reducing peak-to-average power ratio of multiple input multiple output (MIMO) - orthogonal frequency division multiplexing (OFDM) signal for space-frequency coding
  • Method for reducing peak-to-average power ratio of multiple input multiple output (MIMO) - orthogonal frequency division multiplexing (OFDM) signal for space-frequency coding

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[0072] Parameter description: QAM modulation with q=4, MIMO-OFDM system with 2 transmit antennas and N=1024 subcarriers, Q=4 in the parameter set, and M=2 and M=4 for the number of groups respectively.

[0073] Simulation results show that while the present invention effectively reduces PAPR, the bit error rate performance when no sideband information is sent is basically the same as that when the sideband information is completely known. At the same time, due to the reduction of PAPR, the influence of the high power amplifier on the distortion of the signal becomes smaller, and the bit error rate performance of the present invention is better than the bit error rate performance obtained when the original signal passes through the high power amplifier state when the sideband information is not sent. Considerable improvement.

[0074] In Pr{PAPR>PAPR 0}=10 -4 , when the grouping number is 2, adopting the multi-sequence combination method proposed by the present invention can ...

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Abstract

The invention discloses a method for reducing a peak-to-average power ratio of multiple input multiple output (MIMO) - orthogonal frequency division multiplexing (OFDM) signal for space-frequency coding. On a transmitter end, data is coded, interlaced, modulated and alamounti space-frequency coded to obtain a group of frequency-domain sequence, the group of frequency-domain sequence is grouped, so multiple groups of candidate time-domain signals are obtained by selecting appropriate parameters, and a group of time-domain signals with the minimum peak-to-average power ratio (PAPR) is selected to be transmitted. On the end of a receiver, after the operation of a received signal such as fast fourier transformation (FFT), estimation of a channel, space-frequency coding and the like, a frequency-domain signal which is superimposed by the channel noise is obtained, and the hard decision is performed on the frequency-domain signal to obtain a nose-free frequency-domain signal. The signal is restored according to all possible combination ways to obtain candidate data, and only the data which is restored by adopting a correct restoring way conforms to the original modulation constellation.The method can effectively reduce the peak-to-average power ratio of the MIMO-OFDM signal, is free from transmitting the side information, improves the frequency band utilization rate of the system, and can be applied to different communication systems based on the space-frequency coding-based MIMO-OFDM technology.

Description

technical field [0001] The invention belongs to the technical field of wireless and wired communication of multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) signals based on space-frequency coding, and in particular relates to the use of multi-sequence combination to reduce the peak-average value of MIMO-OFDM signals of space-frequency coding Power Ratio (PAPR) is not a method of sending side information. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology, as a very effective transmission method against time-varying multipath channels, has been widely used in wireless communication systems, such as WLAN, WiMAX and DVB systems. At the same time, multiple-input multiple-output (MIMO) technology, as another transmission method that can increase the transmission rate of the wireless communication system, can increase the transmission rate of the wireless communication system without increasing the syst...

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Application Information

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IPC IPC(8): H04B7/06H04L27/26
CPCY02D30/70
Inventor 江涛黎偲屈代明
Owner HUAZHONG UNIV OF SCI & TECH
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