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A transmission signal preprocessing method and device

A technology for transmitting signals and transmission methods, applied in the field of transmission signal preprocessing and transmission methods and devices, to achieve the effects of improving spectrum efficiency, increasing effective coverage, and reducing interference

Inactive Publication Date: 2015-08-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The present invention provides a transmission signal preprocessing method and device, so as to finally solve the problem of reducing co-channel interference in the system transmission process by at least solving the problem of related combination in multi-point transmission technology

Method used

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  • A transmission signal preprocessing method and device
  • A transmission signal preprocessing method and device
  • A transmission signal preprocessing method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] In a distributed cooperative communication system, the number of base stations participating in the current cooperation is 2, and there are K users served under the current cooperative base station set.

[0091] Base station 1 and base station 2 respectively obtain the downlink channel information H of the kth user according to measurement or feedback 1,k and H 2,k , calculate the optimal precoding vector W independently for the kth user 1,k and W 2,k

[0092] The transmitted signal of base station 1 does not undergo phase rotation, that is, The final precoding vector of base station 1 is W 1 , k ~ = W 1 , k

[0093] Base station 2 seeks an optimal rotation angle θ from the pre-designed angle codebook according to the following formula, so that the fol...

Embodiment 2

[0098] In a distributed cooperative communication system, the number of base stations participating in the current cooperation is 2, and there are K users served under the current cooperative base station set.

[0099] Base station 1 and base station 2 respectively obtain the k-th user downlink channel coefficient matrix H according to measurement or feedback 1,k and H 2,k , calculate the optimal precoding vector W independently for the kth user 1,k and W 2,k

[0100] The transmitted signal of base station 1 does not undergo phase rotation, that is, R 1 = 1, the final precoding vector of base station 1 is W 1 , k ~ = W 1 , k

[0101] Use the following formula to directly calculate the phase rotation factor e of base station 2 jθ

[0102] ...

Embodiment 3

[0106] Assume that the base stations participating in the cooperation are base station 1, base station 2, and base station 3, and the number of service users under the three cooperative base stations is K.

[0107] Base station 1, base station 2 and base station 3 respectively obtain the k-th user downlink channel coefficient matrix H according to measurement or feedback 1,k 、H 2,k and H 3,k , calculate the optimal precoding vector W independently for the kth user 1,k , W 2,k and W 3,k .

[0108] Base station 2 and base station 3 seek an optimal rotation angle θ from the pre-designed codebook according to the following formula 2 and θ 3 , so that the following formula holds

[0109]

[0110] In the formula, H 1,k 、H 2,k and H 3,k Denote the downlink channel coefficient matrices from base station 1, base station 2, and base station 3 to user k, respectively. The final precoding vector of base station 2 is The final precoding vector of base station 3 is

[011...

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Abstract

A method and an apparatus for preprocessing and transmitting transmission signal are disclosed in the invention. The method includes that: W 1,k and W 2,k , which are the independent and optimal pre-coding vectors of a first transmission terminal and a second transmission terminal to the kth user, are calculated by the first transmission terminal and the second transmission terminal respectively according to downlink channel coefficient matrixes H 1,kand H 2,k of the kth user acquired through measurement or feedback; phase circumrotation is not performed for the transmission signal of the first transmission terminal, that is, the phase circumrotation matrix is R1=1, and a final pre-coding vector of the first transmission terminal is W ~ 1,k=W 1,k; a phase circumrotation matrix R2 of the second transmission terminal is calculated, and a final pre-coding vector of the second transmission terminal is calculated by W ~ 2,k= W 2,k°e j? according to the phase circumrotation matrix R2 of the second transmission terminal, wherein e j? is a phase circumrotation factor; the final pre-coding vectors W ~ 1,k and W ~ 2,k are made as processing weight values of the transmission sides which are used to multiply the respective original transmission signals, and the obtained results by multiplying are transmitted through antennas as final transmission signals. The invention reduces interference at the edge of cells and improves the frequency spectrum efficiency at the edge of cells.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically, relates to a method and device for preprocessing and sending a transmitted signal. Background technique [0002] With the continuous development of multi-antenna communication technology, it is found that for the current cellular network topology, in the practice of OFDMA technical standards 802.16e / m and LTE, the real same-frequency networking has not been realized, resulting in isolated cell spectrum The efficiency is higher and the networking efficiency is lower. In addition to the cell edge rate problem in the same-frequency networking, the average throughput of the cell is also significantly reduced. The same-frequency networking is one of the most important problems faced by both OFDMA standards WiMAX and LTE. Multi-point transmission uses different radio frequency access points (RRUs), base stations (BSs) and relay stations (Relays) in the base stati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04W16/14
CPCH04B7/0634
Inventor 宁迪浩朱登魁肖华华鲁照华
Owner ZTE CORP
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