A wireless communication ball decoding method based on signal characteristics
A technology for wireless communication and signal characteristics, applied in baseband systems, digital transmission systems, electrical components, etc., can solve the problem of high complexity, achieve low complexity, ensure bit error performance, and improve noise suppression.
Active Publication Date: 2018-04-13
SOUTH CHINA UNIV OF TECH
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[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a wireless communication sphere decoding method based on signal characteristics. Excellent receiving performance to solve the problem of high complexity of current MIMO receivers while ensuring excellent bit error performance
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[0019] Such as figure 1 Shown, a kind of wireless communication ball decoding method based on signal characteristic, comprises the following steps:
[0020] Step S101, extracting the auxiliary signal and the data signal to be demodulated from the received signal, wherein the data signal to be demodulated is hereinafter specifically referred to as the received signal, denoted as y, while the real transmitted signal is denoted as x;
[0021] Step S102, by extracting auxiliary signals, estimating the channels participating in this communication to obtain a channel matrix, or obtaining channel information by other means, the channel matrix is denoted as H, and w represents the noise of this communication;
[0022] Step S103, rotate the received signal y=Hx+w according to a certain angle θ, namely:
[0023] y exp(jθ)=Hx exp(jθ)+w exp(jθ);
[0024] For PSK signals, θ can be 0 degrees, and for QAM signals, θ can be 45 degrees to meet the following conditions:
[0025] conj(z)=Mz...
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The invention discloses a wireless communication sphere decoding algorithm based on signal characteristics. The method for achieving sphere decoding in each decoding cycle comprises the following steps that 1, channel information participating in decoding and signal to noise ratio information are obtained through collection or evaluation before it is confirmed that decoding needs to be conducted, and a channel matrix is broken down according to the channel information and the signal to noise ratio; 2, during decoding, received signals are rotated by a certain angle, wherein the rotating angle is relevant to the modulation mode; a rotating factor is introduced in decoding by transforming the rotated received signals, and dimension expansion is conducted on the received signals subjected to unitary transformation by means of the signal characteristics; 3, the signals in the expanded dimension are ranked in a certain sequence, a proper rotating factor is obtained through sphere decoding searching, and the signal corresponding to the rotating factor is an evaluation signal. The wireless communication sphere decoding algorithm based on the signal characteristics has the advantages that the algorithm can be suitable for demodulation in various modes, the bit error performance approximating sphere decoding can be achieved, and the calculation complexity is lower than that of a traditional sphere decoding algorithm.
Description
technical field [0001] The present invention relates to a wireless communication technology, in particular to a wireless communication sphere decoding method based on signal characteristics. The decoding method is a simplified sphere decoding receiver detection method in a wireless communication system. Background technique [0002] The increasing demands of wireless communication services have brought new challenges to the capacity of wireless systems. This challenge is more evident in mobile communication systems and wireless local area network (WLAN) systems. To address this challenge, multiple-input multiple-output (MIMO) technology can improve system performance by using multiple antennas at the transceiver end. Currently, the MIMO technology at the base station is widely used. [0003] The MIMO system uses multiple transmit antennas for data transmission at the transmit end, and multiple receive antennas for data reception at the receive end. When the interval betwe...
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IPC IPC(8): H04L1/00
CPCH04L25/03242
Inventor 丁跃华冯穗力李南希张榕彬
Owner SOUTH CHINA UNIV OF TECH