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Low complexity receiver and method for low density signature modulation

A low-density, multiplication technology, applied in the field of wireless technology, can solve impractical problems

Active Publication Date: 2016-04-20
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

LDS reception with MPA provides good performance and features, but it may not be practical for other schemes, such as Orthogonal Frequency Division Multiple Access (OFDMA)

Method used

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  • Low complexity receiver and method for low density signature modulation
  • Low complexity receiver and method for low density signature modulation
  • Low complexity receiver and method for low density signature modulation

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Embodiment Construction

[0020] The structure and operation of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to use the invention, and do not limit the scope of the invention.

[0021] Although MPA utilizes sparse sequences in symbol multiplexing to reduce the complexity of multi-user detection, there is still room to reduce the complexity (in terms of computation time) of MPA detectors while guaranteeing near-optimal performance of MPA. Various system and method embodiments are provided for implementing low-complexity MPA schemes with substantially little or tolerable performance loss compared to standard MPA. This low-complexity MPA scheme can be implemented by a receiver (referred to herein as a "low-complexity receiver") for LDS modulate...

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Abstract

Method and apparatus embodiments are provided for low complexity message passing algorithm (MPA) detection with substantially minor or tolerated performance loss compared to the standard MPA. A method includes calculating, at a detector, a plurality of function nodes (FNs) according to a plurality of received multiplexing signals for a one or a plurality of user equipments (UEs) using a plurality of first MPA computations that map a plurality of variable nodes (VNs) corresponding to the UEs to the FNs and using a priori information in an initial vector of probabilities for each of the VNs, excluding from the first MPA computations a plurality of first relatively small multiplication terms, updating the probabilities for the VNs using the last calculated FNs and a plurality of second MPA computations that map the FNs to the VNs, and excluding a plurality of second relatively small multiplication terms from the second MPA calculations.

Description

[0001] This application claims U.S. Nonprovisional Application No. 14 / 212,583, filed March 14, 2014, entitled "Low Complexity Receiver and Method for Low Density Signature Modulation," and the March 2013 The interests of U.S. Provisional Patent Application No. 61 / 788,881, filed on the 15th, entitled "Low Complexity Receiver for Low Density Signature Modulation (Low Complexity Receiver for Low Density Signature Modulation)", the contents of these two applications are incorporated by reference into this text technical field [0002] The present invention relates to wireless technology and, in particular embodiments, to a low complexity receiver and method for low density signature modulation. Background technique [0003] Low Density Signature (LDS) is a Code Division Multiple Access (CDMA) technique in which the spreading sequence of the data symbols is sparse. Message Passing Algorithm (MPA) is a belief propagation (BP) based multiuser detection for LDS modulation. The MPA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/00
CPCH04J13/0007H04B1/707
Inventor 侯赛因·尼克泊阿里瑞扎·白野斯特默罕默德哈迪·巴里
Owner HUAWEI TECH CO LTD
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