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How to generate a codebook

A codebook and precoding technology applied in the field of communication systems

Active Publication Date: 2016-02-17
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] - New codebook coefficients can be easily restricted to 8PSK alphabet (by constraining the constellation of phase parameters)

Method used

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  • How to generate a codebook
  • How to generate a codebook
  • How to generate a codebook

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] version 8 codebook

[0028] For reference, we repeat the Release 8 codebook specification for 4 antennas:

[0029] For transmission on 4 antenna ports, p ∈ {0,1,2,3}, the precoding matrix W shall be chosen from Table 6.3.4.2.3-2 or a subset thereof. quantity means derived from the expression A set of {s} matrices defined by the given columns, where I is the 4×4 identity matrix and the vector are given in Table 1 below.

[0030] Table 1:

[0031] Codebook for transmission on antenna ports {0,1,2,3}

[0032]

[0033] According to an exemplary embodiment of the present invention, and using the same notation as above, a new codebook for 8 antennas can be defined in the following form:

[0034]

[0035] in is a new codebook entry for codebook index m and layer number υ derived from two sets of coefficients from the Release 8 codebook defined by indices n1 and n2 and sets of columns {s1} and {s2} respectively get. is the appropriate scaling factor and is...

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Abstract

A precoding codebook matrix / vector of length 2L is generated by the selection of two matrices / vectors, each from one of a predetermined set of L×L matrices and multiplying each column of one of the matrices / vectors by a complex coefficient.

Description

technical field [0001] The present invention relates to a communication system and a communication method in which stations use MIMO transmission. In a particular example, the present invention relates to mobile networks, such as UMTS Long Term Evolution (LTE) networks. Background technique [0002] In wireless communications such as LTE, both base stations (also called evolved Node Bs or eNodeBs) and terminals (also called user equipment or UEs) are typically equipped with multiple antennas. This allows MIMO operation. The mobile terminal typically measures the downlink channel for each pair of antennas and derives a channel state report to send to the base station. The base station can then use this information for scheduling decisions, such as: [0003] ●Which terminals are sent to; [0004] ● Which frequency / time / code resources to use; [0005] • MIMO transmission mode (eg number of spatial streams, SU-MIMO or MU-MIMO). [0006] An efficient method for capturing ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06
CPCH04B7/0639H04B7/0417H04B7/0456H04B7/0469H04B7/0478
Inventor M.特萨诺维T.J.莫斯莱C.C.奇奥
Owner KONINK PHILIPS ELECTRONICS NV