Non-codebook-precoding-based transmission method for multi-input multi-output (MIMO) system
A transmission method and precoding technology, applied in transmission systems, digital transmission systems, baseband system components, etc., can solve disadvantages and other problems
Inactive Publication Date: 2011-07-13
BEIJING UNIV OF POSTS & TELECOMM
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It can be clearly seen from the figure that after the SQLD operation, the sub-channels of each layer are basically arranged in ascending order according to the detection order, which is still very unfavorable for suppressing error propagation
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Embodiment 1
[0104] Such as Figure 5 Shown is the transmission model diagram of the embodiment of the present invention; in this embodiment, the sending end uses the channel reciprocity of the TDD system to obtain channel information, and the specific steps include:
[0105] S501: The sending end performs channel coding on the initial bit-level sending signal b; preferably, channel coding methods such as Turbo codes and LDPC codes can be used;
[0106] S502: The sender performs symbol modulation on the channel-coded bit-level signal to obtain Preferably, QPSK, 16QAM, 64QAM and other modulation methods can be used;
[0107] S503: The sending end inserts the pilot; preferably, it can be realized by means of frequency division, time division, code division, etc.;
[0108] S504: The sender directly uses the channel reciprocity of TDD to obtain the channel state information H at time t t ;
[0109] S505: The sending end pairs H t Perform SLQD to get the unitary matrix Q t , the lower tr...
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The invention provides a non-codebook-precoding-based transmission method for a multi-input multi-output (MIMO) system, which comprises the following steps that: a transmitting end acquires the channel information of the previous time by using feedback or specific channel reciprocity of a time division duplexing (TDD) system, acquires a unitary matrix Q and a lower triangular matrix L in which elements on a diagonal are arranged in a descending order of the probability by performing sequential LQ decoding (SLQD) operation on the channel information, and then finishes precoding of transmission signals and a pilot frequency; the receiving end performs channel estimation on the pilot frequency signal which finishes precoding, acquires the lower triangular matrix L in which elements on a diagonal are arranged in a descending order of the probability, which is obtained after the transmitting end performs the SLQD, processes the received signal by a successive interference cancellation (SIC) technology, eliminates interference of some layer of sub-channel signals from the front layers of sub-channels, and finishes data stream detection of each sub-channel layer by layer. According to the technical scheme of the invention, the MIMO sub-channel detection performance of the receiving end is efficiently improved and the complexity of the processing operation of the receiving end is reduced.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a transmission method based on non-codebook precoding (SLQD) used in MIMO systems. Background technique [0002] With the deepening of multi-antenna technology research, Multiple-Input Multiple-Output (MIMO) systems have been widely used, which can bring many benefits to channel capacity, link reliability and coverage, such as Foschini et al. of Bell Labs proposed a simple codec (Vertical Bell Labs layered Space-Time, V-BLAST) structure, and the experimental system achieved a spectral efficiency of up to 20-40Bits / Hz ( 4 transmitting antennas and 8 receiving antennas). For the V-BLAST system, the maximum likelihood detection is the optimal reception in the sense of the minimum bit error rate, but its decoding complexity increases exponentially with the number of antennas and the number of modulation constellation points. The sorted serial interference cancellatio...
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IPC IPC(8): H04L25/03H04B7/04H04B7/06H04B7/08
CPCH04L25/0204H04B7/0621H04L1/0631H04L1/0656
Inventor 李立华张平高向川孙奇宋磊徐晓亮
Owner BEIJING UNIV OF POSTS & TELECOMM