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Apparatus and method for non-orthogonal transmissions

A non-orthogonal, signal transmission technology, applied in the field of non-orthogonal transmission, can solve problems such as complex demodulators, and achieve good system performance, small complexity, and flexible design effects

Active Publication Date: 2018-03-02
HUAWEI TECH CO LTD
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Problems solved by technology

Such a demodulator is usually too complex for practical applications since it must go through all possible sequences of

Method used

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  • Apparatus and method for non-orthogonal transmissions
  • Apparatus and method for non-orthogonal transmissions
  • Apparatus and method for non-orthogonal transmissions

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Embodiment Construction

[0048] reference figure 1 , Shows a block diagram of an exemplary transmitter apparatus 100 including aspects of the disclosed embodiments. The various aspects of the disclosed embodiments point to increasing the aggregate spectrum efficiency in the LDS-type multiple access transmission scheme, while reducing the complexity of the receiver.

[0049] reference figure 1 In the transmitter device 100, a different Forward Error Correction (FEC) encoder 102 is used to encode K information bit streams u. The coded bits d corresponding to different streams K are subjected to rate matching in the corresponding rate matching device 104. The rate-matched bits e are independently interleaved in one of the interleavers 106, and then mapped to modulation symbols or modulated data messages in the modulator 108. Then, the modulated data message is fed to the LDS transmitter 110 for expansion using a no cycle or cycle-free LDS expansion matrix (referred to herein as an acyclic signature matrix)...

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Abstract

A transmitter apparatus in a wireless communication system that includes a processor. In one embodiment, the processor is configured to receive at least one modulated data message and spread the at least one modulated data message into a transmission signal using a low density signature matrix. The low density signature matrix is a cycle-free signature matrix. A receiver apparatus is configured toreceive the transmission signal and detect within the received transmission signal at least one modulated data message. The processor is configured to detect the at least one modulated data message in one iteration using the cycle-free signature matrix. Such cycle-free signature matrices are constructed as a concatenation of phase rotating identity matrices and all-zero matrices.

Description

Technical field [0001] Aspects of the present disclosure generally relate to wireless communication systems, and more particularly to non-orthogonal transmission between base stations and wireless user equipment. Background technique [0002] One of the main challenges of next-generation wireless communication systems is the considerable increase in traffic. Current systems such as Long Term Evolution (LTE) have provided very high peak data rates for each user in the uplink and downlink. Therefore, it seems reasonable to believe that such predicted service growth is the reason for the higher overall data rate, that is, the higher spectrum efficiency of many simultaneous users, rather than increasing the spectrum efficiency of each user. [0003] When considering several users, code division multiple access (CDMA) is one of the most spectrally efficient schemes. In the CDMA type system, after being assigned a user-specific signature and extension, multiple codewords related to dif...

Claims

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Application Information

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IPC IPC(8): H04J13/00
CPCH04J13/0007H04B1/707
Inventor 阿娜伊德·罗伯特萨法维阿尔伯托·杰赛普·佩罗蒂布兰尼斯拉夫·波波维奇
Owner HUAWEI TECH CO LTD
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