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Method for obtaining optimum guide symbolic power

An optimal and power technology, applied in the field of optimizing the power of OFDM pilot symbols, which can solve the problems of reducing the accuracy of channel estimation, decreasing the signal-to-noise ratio during demodulation, and increasing the interference of data symbols.

Inactive Publication Date: 2005-07-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0010] When the total transmission power of the system is limited, for channel estimation assisted by pilot symbols, on the one hand, increasing the power of pilot symbols can improve the accuracy of channel estimation, but the interference to data symbols will also increase. With the increase of the power of the pilot symbol, the power allocated to the data symbol will inevitably decrease, resulting in a decrease in the signal-to-noise ratio during demodulation; on the other hand, reducing the power of the pilot symbol will reduce the accuracy of channel estimation, especially when the mobile station moves at high speed Time

Method used

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  • Method for obtaining optimum guide symbolic power
  • Method for obtaining optimum guide symbolic power
  • Method for obtaining optimum guide symbolic power

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Embodiment Construction

[0043] The first step, in the OFDM system (i.e. M=16) that adopts 16QAM modulation, select channel to be M.1225Vehicular ChannelA, the amplitude of each path is Rayleigh distribution, select three-path channel (i.e. L=3), each The power spectrum of one path is Classic spectrum. Set the carrier frequency as 2GHz, the signal bandwidth as 20MHz, and the number of subcarriers N=4096, then the symbol period is 200μs, the guard interval is 50μs, and the interval of the pilot symbols in the frequency domain and the time domain is 4 (that is, D t =D f =4). In addition, set the signal-to-noise ratio of the channel as: E b / N 0 = 12dB.

[0044] In the second step, the interpolation filter depth is set to be 3 (that is, Q=P=3), and the system parameters and the sinc function shown below are given by the previous step:

[0045] f p l = sin c ( l ...

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Abstract

The invention supplies a method to gain the optimal guidance symbol power. It is used the factors that system noise signal ration in the channel estimating, base station and mobile platform relative move speed, coherent testing channel estimating interpolation filter coefficient and it depth, signal modulating module and the functional relation between the optimal guidance symbol power and the data symbol power ratio to gain the method used to gain the optimal power radio. The method of the invention is adopted to gain the optimal bit error ratio to the self-adapting OFDM system at the condition of giving the total emission power.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to the technology of optimizing OFDM pilot symbol power. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a high-speed transmission technology in a wireless environment. The main idea of ​​OFDM technology is to divide a given channel into many orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel, if the guard interval is selected properly, then each sub-channel The fading exhibits a flat characteristic, and can greatly reduce Inter-Symbol Interference (ISI). [0003] Compared with the single-carrier system, the OFDM system uses multiple subcarriers to transmit a parallel data stream, and the coded and interleaved data stream is modulated on multiple subcarriers. In the multipath fading channel with frequency selectivity, the OFDM system has B...

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Application Information

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IPC IPC(8): H04J11/00H04L1/00
Inventor 陈继明张涵邹波唐友喜李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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