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Iterative decision feedback equalization algorithm by loop detection in E-UTRAN uplink

A technology of decision feedback equalization and cyclic detection, which is applied to the shaping network in the transmitter/receiver, baseband system components, multi-frequency code system, etc., can solve the problems of increasing error rate and symbol error judgment, and achieve improved detection performance effect

Inactive Publication Date: 2010-11-03
杨浩
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AI Technical Summary

Problems solved by technology

[0006] Bit error propagation is an unavoidable problem of decision feedback equalization. It means that due to the effect of feedback, the previous wrongly judged symbols will bring this error to subsequent symbol judgments with feedback, resulting in wrong judgments of subsequent symbols and increasing errors. Rate

Method used

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  • Iterative decision feedback equalization algorithm by loop detection in E-UTRAN uplink
  • Iterative decision feedback equalization algorithm by loop detection in E-UTRAN uplink
  • Iterative decision feedback equalization algorithm by loop detection in E-UTRAN uplink

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] figure 1 It is the system block diagram of DFT-S OFDM sending end and receiving end.

[0018] For a single user, the data is transformed into the time domain by DFT and then allocated to specified subcarriers (the number of occupied subcarriers can be set, and the allocation methods can be centralized or distributed), with a total of 512 subcarriers. Then IFFT transforms the frequency domain signal into a time domain signal to form LB (long block), and add a cyclic prefix. Multiple LBs constitute a transmission subframe.

[0019] figure 2 It is a comparison diagram of CP structure and two UW structure frames in LB.

[0020] Sub-picture (a) is the frame structure required in the protocol, and the last 31 bits in the data LB are copied to the front of the block to form a circular structure. The sub-picture (b) is a traditional UW structure, and the space bet...

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Abstract

The invention provides a novel and efficient decision feedback equalization algorithm applicable to an E-UTRAN uplink. The algorithm takes the traditional frequency domain decision feedback equalization algorithm as a basis, adds a loop detection mechanism, and greatly reduces error code transmission and improves the reliability of data transmission through a plurality of iterative feedback. In addition, the algorithm adopts hard decision in the course of iterative feedback, thus greatly reducing complexity; and the algorithm does not need to change the frame structure of the uplink in an E-UTRAN protocol and the transmitter structure of a system, and does not affect the effectiveness.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to an E-UTRAN uplink and an E-UTRAN uplink cycle detection iterative decision feedback equalization algorithm. Background technique [0002] In order to meet people's ever-growing needs for mobile communication, there are some basic requirements in the selection of uplink wireless transmission technology: such as supporting scalable bandwidth, moderate PAPR / CM, ensuring the orthogonality of uplink transmission, etc. The single-carrier transmission scheme DFT-S OFDM has low PAPR (peak-to-average ratio) / CM (cubic metric), can improve power efficiency and expand coverage, and has become a basic candidate for LTE uplink transmission. [0003] Channel fading caused by multipath propagation is one of the most important problems in high-speed wireless data transmission. Equalization is an effective means to modify the transfer characteristics of modern channels. Linear equalizatio...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
Inventor 杨浩
Owner 杨浩
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