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首页> 外文期刊>International journal of communication systems >Power domain cyclic spread multiple access: An interference‐resistant mixed NOMA strategy
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Power domain cyclic spread multiple access: An interference‐resistant mixed NOMA strategy

机译：功率域循环扩展多址：抗干扰的混合NOMA策略

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摘要

The next generation wireless access technology highly relies on nonorthogonal multiple access (NOMA) technique. This paper proposes a novel power domain cyclic spread multiple access (PDCSMA) scheme for the design of NOMA system with power domain superposition coding (SC) and cyclic spreading at the transmitter concurrent with symbol level successive interference cancellation (SL-SIC) at the receiver. Based on acceptable difference in channel gain, the users are grouped together to form PDCSMA clusters, and the unique power is allotted to each user in a cluster. The user with good channel condition is allotted less power, and the user with poor channel condition is allotted more power. Each PDCSMA cluster has its own spreading code, and the data of every user in a cluster are cyclic spread with the same code. Each cluster supports the number of multipath components equivalent to the length of the spreading code. The use of cyclic spreading makes the signal suffered by multipath fading less prone to intra cluster interference. The user signal is decoded by minimum mean square error-frequency domain equalization (MMSE-FDE) or maximal ratio combining (MRC)-based receiver in which weak user is detected with hard decision, and strong user is detected with SIC. Compared with conventional power domain NOMA (PDNOMA) and interleaved NOMA, the proposed PDCSMA achieves better bit error rate (BER) performance and assures guaranteed detection.
机译：下一代无线接入技术高度依赖于非正交多址（NOMA）技术。本文针对NOMA系统的设计提出了一种新的功率域循环扩展多址（PDCSMA）方案，该系统具有功率域叠加编码（SC）和发射器处的循环扩展以及接收器处的符号级连续干扰消除（SL-SIC） 。根据可接受的信道增益差异，将用户分组在一起以形成PDCSMA群集，并将唯一功率分配给群集中的每个用户。信道状况好的用户分配的功率较小，信道状况差的用户分配的功率较大。每个PDCSMA群集都有自己的扩展代码，并且群集中每个用户的数据都使用相同的代码进行循环扩展。每个集群都支持与扩展代码的长度相等的多路径分量。循环扩频的使用使得遭受多径衰落的信号较不容易受到集群内干扰。用户信号通过基于最小均方误差频域均衡（MMSE-FDE）或基于最大比率组合（MRC）的接收器进行解码，其中使用硬决策检测弱用户，而使用SIC检测强用户。与传统的电源域NOMA（PDNOMA）和交错式NOMA相比，所提出的PDCSMA具有更好的误码率（BER）性能，并确保了检测的可靠性。

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