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Equalizing device and equalizing method in transmission diversity mode of LTE (long term evolution) system

A technology of transmit diversity and equalization device, applied in space transmit diversity, baseband system components, diversity/multi-antenna systems, etc., and can solve problems such as residual interference and system performance degradation

Active Publication Date: 2012-09-19
合肥东芯通信股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In view of this, the purpose of the present invention is to provide an equalization device and method in transmit diversity mode in an LTE system, to overcome the residual interference caused by the introduction of non-orthogonality in the equalization method of the prior art, thus resulting in the degradation of the overall system performance The problem

Method used

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  • Equalizing device and equalizing method in transmission diversity mode of LTE (long term evolution) system
  • Equalizing device and equalizing method in transmission diversity mode of LTE (long term evolution) system
  • Equalizing device and equalizing method in transmission diversity mode of LTE (long term evolution) system

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Embodiment 1

[0092] See attached figure 1 , In order to be applied in the transmit diversity mode of the long-term evolution LTE system, the structure diagram of an equalization device disclosed in the first embodiment of the present invention mainly includes: an equivalent channel unit 101, a space division multiplexing equalization unit 102, and a second layer processing Unit 103.

[0093] in figure 1 In the equivalent channel unit 101, based on the number of transmitting antennas and receiving antennas, the receiving antennas construct equivalent channels in pairs according to the two-antenna transmit diversity mode.

[0094] Assume that NR is the number of receiving antennas at the receiving end of the system, NT is the number of transmitting antennas at the transmitting end of the system, and NR and NT take a number greater than or equal to 1.

[0095] Take a group of transmitting antennas i and j as an example for description. The corresponding matrix structure of the data signal r sent ...

example 1

[0109] When there are two transmitting antennas and N receiving antennas, N is greater than or equal to 1.

[0110] The equivalent channel unit 101 constructs an equivalent channel based on two transmitting antennas and N receiving antennas, and the N receiving antennas receive the data signal r sent by the two receiving antennas as shown in equation (3).

[0111] r = r 0 ( 0 ) conj ( r 0 ( 1 ) ) · · · r N - 1 ( 0 ) conj ( r N - 1 ( 1 ) ) - - - ( 3 )

[0112] Among them, r(0) represents the signal of the 0th subcarrier, and r(n) represents the signal of the nth subcarrier. The equivalent channel response H corresponding to each group of equivalent channels is shown in equation (4).

[0113] H = h 00 ( 0 ) - h 01 ( 0 ) conj ( h 01 ( 1 ) ) conj ( h 00 ( 1 ) ) ...

example 2

[0116] When there are two transmitting antennas and the receiving antenna is a single antenna:

[0117] The equivalent channel unit 101 constructs an equivalent channel based on two transmitting antennas and a single antenna for receiving.

[0118] The data signal r received by the single antenna is shown in equation (5).

[0119] r = r ( 0 ) conj ( r ( 1 ) ) - - - ( 5 )

[0120] The corresponding equivalent channel response H is shown in equation (6).

[0121] H = h 00 ( 0 ) - h 01 ( 0 ) conj ( h 01 ( 1 ) ) conj ( h 00 ( 1 ) ) - - - ( 6 )

[0122] Among them, r(0) represents the signal of the 0th subcarrier, r(1) represents the signal of the 1st subcarrier; h 00 (1) Represents the channel response from the 0th transmitting antenna to a single antenna on the first subcarrier; h 00 (0) represents the channel response ...

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Abstract

The invention discloses an equalizing device and an equalizing method in a transmission diversity mode of an LTE (long term evolution) system. The method includes the steps: constructing equivalent channels according to the number of transmitting antennas and receiving antennas, properly adjusting inputted OFDM (orthogonal frequency division multiplexing) signs and transmitting data signals and corresponding channel response in a two-antenna transmission diversity mode; precoding the channel response received by the receiving antennas; acquiring precoded channel response and the data signals received by the receiving antennas for space division multiplexing and equalizing, and acquiring and outputting a first layer and a second layer of soft bits; and receiving and processing the second layer of soft bits, and acquiring a soft bit value after negating a second soft bit value of each sign to serve as correct soft bit value output. Residual interference caused by non-orthogonality can be effectively resisted and reduced in a space division multiplexing and equalizing manner, so that system performances are improved.

Description

Technical field [0001] The present invention relates to the field of communication technology, and in particular to an equalization device and method in transmission diversity mode in LTE (Long Term Evolution system). Background technique [0002] The currently widely recognized wireless communication technology in the field of communication technology is 3GP LTE, and the Multiple-Input Multiple-Out-put (MIMO) technology is a key technology in the LTE system. MIMO technology is mainly used to provide space diversity gain and space division multiplexing gain. Among them, space diversity is realized by transmitting diversity and receiving diversity. [0003] In the LTE system, SFBC (Space Frequency Block Code, Space Frequency Block Code) transmission mode is mostly used for transmit diversity, and this transmission mode can simultaneously transmit two symbols on two subcarriers. Specifically, the two-antenna diversity transmission process is shown in Table 1. Two symbols x1 and x2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L1/06H04B7/08
Inventor 莫勇张国松李亚辉胡剑锋任江涛吴齐发唐相国
Owner 合肥东芯通信股份有限公司
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