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LTE-A double codebook pre-coding selection method based on wave beam operation and group average

A precoding and dual codebook technology, applied in the field of LTE-A dual codebook precoding selection based on beam operation and grouping averaging, can solve problems such as increasing the number of subcarriers

Active Publication Date: 2015-09-02
上海瀚芯实业发展合伙企业(有限合伙)
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Problems solved by technology

2) On the other hand, its computational complexity increases as the bandwidth increases and the number of subcarriers increases

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  • LTE-A double codebook pre-coding selection method based on wave beam operation and group average
  • LTE-A double codebook pre-coding selection method based on wave beam operation and group average
  • LTE-A double codebook pre-coding selection method based on wave beam operation and group average

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Embodiment Construction

[0041] Below in conjunction with embodiment the present invention will be further described.

[0042] figure 1 Among them, for the dual codebook precoding of the transmission layer 1-4 under the LTE-A 8-antenna spatial multiplexing transmission mode, the LTE-A dual codebook precoding selection method based on beam calculation and group averaging in the present invention is applied to In the air interface model of WLAN and LTE heterogeneous network convergence, the following steps are included:

[0043] (1) In the frequency domain, for any channel on the entire bandwidth, traverse to find all the maximum and minimum values ​​in the channel frequency response amplitude corresponding to all subcarriers (the maximum and minimum values ​​appear at intervals), and calculate the two The difference between the adjacent maximum and minimum values ​​is taken as the absolute value, which is recorded as ΔH i , and calculate the number of subcarriers Δk between two adjacent maximum and min...

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Abstract

The invention discloses an LTE-A double codebook pre-coding selection method based on wave beam operation and group average. Aiming at double codebook pre-coding adopted in 1 to 4 transmission layers in an LTE-A8 antenna spatial multiplexing mode, taking mutual information maximization as a rule and through traversing wave beam vectors and phase modulating parameters and storing products of phase modulating channels and wave beams, the calculation of mutual information can be acquired through table look-up and a problem of a large amount of repeated calculation in pre-encoding matrix selection in the prior art is solved. According to the invention, the thought of group average is adopted for grouping subcarriers of the whole bandwidth and mutual information amount is calculated by utilizing the average value of the channels, so that the number of the channels requiring calculation is reduced substantially. Under a premise of not losing pre-coding performance, frequencies of complex multiplication, addition and matrix inverse operation are reduced and calculation complexity is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an LTE-A 8-antenna spatial multiplexing dual-codebook precoding selection algorithm, in particular to an LTE-A dual-codebook precoding selection method based on beam calculation and group averaging. Background technique [0002] The 3GPP LTE-A (LTE-Advanced) project is an evolution of LTE (Long Term Evolution), corresponding to LTE Release 10 and later versions. In LTE-A, the carrier aggregation technology supports a maximum bandwidth of 100MHz, a peak downlink rate of 1Gbit / s, and a peak spectral efficiency of 30bit / s / Hz. [0003] To achieve peak spectrum efficiency, LTE-A downlink supports up to 8 transmit antennas for data transmission, supports up to 8 layers of spatial multiplexing, and adopts a dual codebook precoding scheme. For layer 1 and layer 2, codebook 1 has a total of 16 matrices, each matrix is ​​composed of 4 beam vectors, codebook 2 is composed of a...

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Application Information

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IPC IPC(8): H04B7/04
CPCH04B7/04H04B7/0456H04B7/0478
Inventor 衡伟胡津铭朱云帆陈雪倩张清华
Owner 上海瀚芯实业发展合伙企业(有限合伙)
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