A Pilot Design and Channel Estimation Method for Offset Orthogonal Multi-Carrier System
A multi-carrier system and channel estimation technology, which is applied in the field of broadband wireless communication, can solve problems such as difficult data recovery, large error of channel impulse response value, and increased system complexity, so as to improve realizability, reduce noise interference, and simplify equations group effect
Active Publication Date: 2018-09-18
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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Problems solved by technology
The existing system generally adopts the block insertion method when designing pilots, because the OFDM-OQAM system is only orthogonal in the real part, and the actual channel is not ideal, so adjacent symbols and adjacent subcarriers will generate virtual signals for the current pilot. If a zero-forcing algorithm similar to OFDM symbols is used in channel estimation, the error of the channel impulse response value obtained is relatively large, and it is difficult to restore the data after equalization
In addition, the received signal contains relatively complex interference components, which cannot be completely eliminated only by taking the real part operation, so it is generally necessary to use methods such as constructing a grid point model, interference estimation and cancellation, and iterative operations to further eliminate residual interference. thus increasing the complexity of the system
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[0027] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
[0028] Under comparable channel models, in order to reduce algorithm complexity and improve system realizability, this embodiment proposes a novel OFDM-OQAM pilot design and channel estimation method.
[0029] The OFDM-OQAM pilot adopts a set of optimized block pilot design methods and normalizes the complex structure, which is superior to the classic IAM that only uses real or imaginary parts for channel estimation in terms of...
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The invention relates to a pilot frequency design and channel estimation method for an offset orthogonal multicarrier system. The method comprises steps that, an optimal pilot frequency sequence is employed to carry out pilot frequency design for the offset orthogonal multicarrier system; channel estimation for a reception end is carried out by employing a forward single-time two-dimensional filtering method. The method is advantaged in that, algorithm complexity is reduced, and system realizability is improved.
Description
technical field [0001] The invention relates to the field of broadband wireless communication, in particular to a pilot frequency design and channel estimation method of an offset orthogonal multi-carrier system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is the most mainstream broadband communication modulation method at present. It has the characteristics of high spectral efficiency, strong anti-multipath ability, and flexible multiple access. It is especially suitable for wireless high-speed data transmission under urban multipath channels. . Combined with MIMO (Multiple Input Multiple Output), it has been widely used in IEEE802.11a / g / ac Wireless Local Area Network (WLAN), IEEE802.16 Worldwide Interoperability for Microwave Access (WiMAX), IEEE802.22 Wireless Metropolitan Area Network (WRAN ), the fourth generation mobile communication (4G) and so on. [0003] Although the OFDM system has obvious advantages, it also has some disadvan...
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IPC IPC(8): H04L27/26H04L25/02
CPCH04L25/0202H04L27/261
Inventor 施玉松邱云周罗炬锋汪涵李凤荣刘衍青叶晓青尚素娟郑春雷
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI