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Space diversity method and device

一种空间分集、空频分组编码的技术，应用在分集领域，能够解决不便、未定义八根发射天线分集方式等问题，达到提高分集增益、实现频率分集和编码增益、增加符号发送的次数的效果

Active Publication Date: 2010-07-07
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing LTE standard, the diversity mode under eight transmit antennas is not defined, so it is currently impossible to realize data transmission based on eight transmit antennas in the LTE-Advanced system, which brings inconvenience to practical applications

Method used

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Embodiment 1

[0044] In this embodiment, eight antenna ports are divided into groups of four. The space diversity method of this embodiment includes the following steps:

[0045] Step 11: use SFBC based on Alamouti coding as the smallest unit of space-time coding;

[0046] Step 12: Carry out orthogonal processing on SFBC to obtain the transmission signals of the four antenna ports;

[0047] For SFBC based on Alamouti coding, the Alamouti coding when four antennas are used to transmit simultaneously is shown in formula (3):

[0048] S 1 cS 3 - S 2 * - S 4 * ...

Embodiment 2

[0065] In this embodiment, the eight antenna ports are divided into two groups, and the rotation factor is 1. The space diversity method of this embodiment includes the following steps:

[0066] Step 21: use SFBC based on Alamouti coding as the smallest unit of space-time coding;

[0067] Step 22: Perform orthogonal processing on the SFBC to obtain the transmitted signals of the two antenna ports;

[0068] Here, the orthogonal processing is to perform twiddle factor processing on the SFBC, and the twiddle factor is equal to 1.

[0069] Step 23: Perform cyclic delay on the obtained transmission signals of the two antenna ports to obtain the transmission signals of the remaining six antenna ports;

[0070] Wherein, the cyclic delay is equivalent to the phase rotation processing in the frequency domain, specifically: multiplying the obtained transmitted signals on the two antenna ports by The transmitted signals of the remaining six antenna ports are obtained.

[0071] Here,...

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Abstract

The invention discloses a space diversity method which comprises the following steps: using a space-frequency block code which is based on an alamouti code, as the minimum unit for a space-time code; carrying out orthogonal processing on the space-frequency block code to obtain transmission signals of part of eight antenna ports, and circularly delaying the acquired transmission signals of the antenna ports to obtain transmission signals of the rest of the antenna ports; and each antenna port transmits the acquired transmission signal on the corresponding subcarrier at the corresponding time. The invention also discloses a space diversity device which comprises an orthogonal processing module, a signal circular delay module and a transmission module. The method and the device of the invention can realize data transmission of eight antennae in a long-term evolution advanced system, and can obtain better diversity gains without increasing extra cost for pilot frequency.

Description

technical field [0001] The present invention relates to the diversity technology in the long-term evolution advanced system, in particular to a space diversity method and device based on cyclic delay in the long-term evolution advanced system. Background technique [0002] In the Long-Term Evolution (LTE, Long Time Evolution) system, the downlink defines a diversity mode in which the transmitting antenna is two antennas or four antennas, wherein the diversity mode when the transmitting antenna is two antennas is Space-Frequency Block Coding (SFBC, Space -Frequency Block Coder), its encoding matrix is ​​shown in formula (1): [0003] [0004] In formula (1), each column represents a transmitting antenna, and each row represents a transmitting frequency; S 1 Indicates the symbol sent at the first moment, S 2 Indicates the symbol sent at the second moment, and represent S respectively 1 and S 2 the conjugate. [0005] When the transmitting antennas are four antennas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04B7/06H04L1/06
CPCH04B7/068H04B7/0671
Inventor 姜静孙云锋田开波
Owner ZTE CORP
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