Unitary pre-coding method and device, decoding method and device and unitary pre-coding/pre-decoding system
A technology of unitary precoding and decoding method, applied in baseband system components, shaping network in transmitter/receiver, preventing/detecting errors through diversity reception, etc., can solve parallel sub-channel gain difference and power distribution effect Insignificant, complex signaling control system overhead and other issues, to achieve the effect of reducing gain difference and channel condition number
Inactive Publication Date: 2010-08-11
HUAWEI TECH CO LTD
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[0005] However, due to the randomness of the MIMO channel matrix, the column (or row) vectors of the channel generally have different lengths, and the vectors often show a considerable degree of non-orthogonality, so the obtained after diagonal decomposition There are generally significant differences in the gains of parallel sub-channels, and the channel condition number is also large
Although adjusting the rate and power allocation between sub-channels can reduce the impact of the worst sub-channel on the average throughput of the system, the effect of power allocation is generally not significant, and rate allocation often leads to complex signaling control and additional system overhead
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[0041] Such as figure 1 As shown, it is a flow chart of an embodiment of the decoding method of the present invention. This embodiment takes the closed-loop system FDD as an example to describe the decoding process. The method includes:
[0042] Step 101, performing grid reduction on the channel matrix or the transformation matrix of the channel matrix to obtain a reduced channel matrix;
[0043] At the receiving end, Lattice Reduction (LR) is performed on the channel matrix or the transformation matrix of the channel matrix to obtain the reduced channel matrix; for example, the LR algorithm can be applied to the conjugate transposition matrix of the channel matrix H, and formula (1) can be used to obtain Reduced channel matrix:
[0044] h red =H H T (1)
[0045] Among them, H red Represents a reduced channel matrix, T is a unimodular matrix with integer elements and a determinant of ±1; then formula (1) is transformed to obtain formula (2):
[0046] H ...
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The embodiment of the invention relates to a unitary pre-coding method and a device, a decoding method and a device and a unitary pre-coding / pre-decoding system. The decoding method comprises the following steps of: carrying out grid reduction on a channel matrix or a transformation matrix of the channel matrix to obtain a reduced channel matrix; carrying out diagonalization decomposition on the reduced channel matrix to obtain a group of parallel subchannels and a corresponding unitary matrix; and decoding a receiving signal according to the parallel subchannels and the unitary matrix. In addition, the embodiment of the invention also comprises the unitary pre-coding / pre-decoding system. By carrying out the grid reduction on the channel matrix or the transformation matrix of the channel matrix and carrying out subsequent processing through the unitary pre-coding method and the device, the decoding method and the device and the unitary pre-coding / pre-decoding system, the gain difference and the channel condition number between the parallel subchannels are effectively lowered.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a unitary precoding method and device, a decoding method and device, and a unitary precoding and decoding system. Background technique [0002] With the continuous development of communication technology, multiple-input multiple-output (Multiple-input multiple-output, MIM0) system has also been widely used, it can greatly improve the transmission rate of wireless communication systems without increasing the bandwidth, and meet high rate data transmission business requirements. [0003] While the MIMO system uses the space dimension to increase the rate of signal transmission, it also introduces interference between signals, which is manifested as inter-antenna interference in point-to-point transmission (that is, single user), and closed-loop processing usually has better performance than open-loop systems. performance gain. In a frequency division duplex (FDD) s...
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IPC IPC(8): H04L25/03H04L1/06
Inventor 刘锋沈晖李斌罗毅
Owner HUAWEI TECH CO LTD