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Transmission signal preprocessing transmission method and device

A technology for transmitting signals and a transmitting method, which is applied in the field of transmitting signal preprocessing and transmitting methods and devices, and achieves the effects of reducing interference, improving spectral efficiency, and increasing effective coverage.

Inactive Publication Date: 2012-08-22
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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  • Transmission signal preprocessing transmission method and device
  • Transmission signal preprocessing transmission method and device
  • Transmission signal preprocessing transmission method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] 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.

[0093] 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

[0094] The transmitted signal of base station 1 does not undergo phase rotation, that is, The final precoding vector of base station 1 is

[0095] Base station 2 seeks an optimal rotation angle θ from the pre-designed angle codebook according to the following formula, so that the following formula holds

[0096]

[0097] In the formula, H 1，k and H 2，k Denote the downlink channel coefficient matrices from base station 1 and base station 2 to user k, respectively. The final precoding vector of base station 2...

Embodiment 2

[0100] 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.

[0101] 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

[0102] 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

[0103] Use the following formula to directly calculate the phase rotation factor e of base station 2 jθ

[0104] e jθ = W 2 , k H H ...

Embodiment 3

[0108] 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.

[0109] 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 .

[0110] 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

[0111]

[0112] 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

The invention discloses a transmission signal preprocessing transmission method and device. The transmission signal preprocessing transmission method is applied to a wireless communication system comprising a first transmission terminal and a second transmission terminal both of which participate in cooperation, and comprises the following steps of: calculating each optimal pre-coding vectors W1, k and W2, k independent to the kth user respectively according to measured or fed back kth user downlink channel coefficient matrix H1, k and H2 through the first transmission terminal and the second transmission terminal; without carrying out phase rotation on a transmission signal of the first transmission terminal, i.e., a phase rotation matrix R1 is equal to 1, calculating a phase rotation matrix R2 of the second transmission terminal through the final precoding vector of the first transmission terminal, and calculating a final precoding vector ej theta of the second transmission terminal as a phase rotation factor according to the phase rotation matrix R2 of the second transmission terminal; and according to a final precoding vector and a transmission side processing weight as a processing transmission signal, multiplying by each original transmission signal as a final transmission signal to be transmitted out through an antenna. According to the invention, a multipoint transmission technology is effectively utilized, the interference of a cell edge is reduced, and the frequency spectrum efficiency of the cell edge is improved.

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 Applications(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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