A Channel Estimation Method for Mimo-ofdm System Based on Optimal Pilot
A MIMO-OFDM and channel estimation technology, which is applied in the field of communication channel estimation, can solve problems such as accuracy limitations, and achieve the effects of facilitating hardware implementation, improving method performance, and reducing computational complexity
Active Publication Date: 2017-01-04
SYSU HUADU IND SCI & TECH INST +1
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In addition, in practical applications, LS channel estimation is easily affected by Gaussian white noise and subcarrier interference (Inter-ChannelInterference, ICI), and the accuracy is limited at low signal-to-noise ratios.
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[0020] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.
[0021] Please refer to figure 1 and figure 2 , the present invention is based on the optimal pilot MIMO-OFDM system channel estimation method comprising:
[0022] S101. Periodically insert OFDM block pilot symbols into all carriers by using block pilot insertion. It should be noted that, for frequency-selective channels, the channel is quasi-static or slowly time-varying, and the channel estimation based on fast-running pilots is used to periodically insert block pilot signals on all carriers, which will have a higher Estimated accuracy. as image 3 The 2×2 MIMO system shown is taken as an example, and the transmitting and receiving antennas are correlated. Let the number of subcarriers N=64 of an OFDM symbol, and the cyclic prefix N cp =16. Transmitting antenna 1 transmits bit stream X1, and transmitting antenna ...
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The invention discloses an optimal pilot frequency based MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system channel estimation method. The optimal pilot frequency based MIMO-OFDM system channel estimation method comprises the steps of: designing an optimal pilot frequency sequence; performing STBC (Space Time Block Coding) on the optimal pilot frequency sequence to obtain special pilot frequency sequences; designing multiple special pilot frequency sequences to have a phase shift relationship; processing the special pilot frequency sequences; estimating channel responses at all the time points by adopting an iterative pilot frequency estimation way. Compared with the prior art, the optimal pilot frequency based MIMO-OFDM system channel estimation method simplifies treatment of a receiver as the optimal pilot frequency is designed by applying double standards, i.e., MSE (Mean Square Error) and PAPR (Peak-to-Average Power Ratio) and the STBC pilot frequency design is adopted, reduces algorithm complexity as the multiple special pilot frequency sequences are designed to have the phase shift relationship and multi-dimensional matrix LS (Least Squares) operation is transformed into one-dimensional matrix operation, brings convenience to the implementation of the hardware, improves performances of the traditional channel estimation method and enlarges the range of application of SNR (Signal Noise Ratio) thereof as the method is based on an optimization idea of the system.
Description
technical field [0001] The present invention relates to the technical field of communication channel estimation, in particular to a method for channel estimation in MIMO-OFDM system based on optimal pilot frequency. Background technique [0002] With the improvement of people's requirements for the sound quality of wireless audio, more and more people pay attention to wireless audio technology. [0003] Currently, wireless audio transmission technologies mainly include Bluetooth, WI-FI and MIMO-OFDM. Bluetooth technology has a short transmission distance, low data transmission rate, and weak anti-interference ability, which makes it almost impossible to use in high-quality wireless audio systems. WI-FI technology has wide coverage, fast transmission rate, and strong anti-interference ability. It has been widely used all over the world and is the mainstream technology of today's wireless audio technology. However, the current WI-FI technology still has its own limitations. ...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 陆许明徐永键戴健强谭洪舟
Owner SYSU HUADU IND SCI & TECH INST