In this paper, we propose an uplink joint time and angle domain sparse code multiple access (TASCMA) scheme for mmWave systems to improve the system capacity and user con⌉nectivity. This proposed scheme mainly includes three processes: sparse spreading, antenna allocation and beamforming, which are coordinated by the base station (BS). The spreading process is conducted over time domain by associating a specific sparse spreading vector with each user according to its location, while the antenna allocation and beamforming processes are conducted over angle domain to superimpose the user signals in a beam to further achieve the multiplexing gain. At each user, it spreads its signal with its own spreading sequence and then sends the spread signal to the mmWave channel. At the BS receiver, first the receive beamforming is performed and then a corresponding factor graph is constructed, based on which, message passing algorithm (MPA) is performed to recover all users' transmitted messages. Simulation results show that the proposed TASCMA scheme has better Bit Error Rate(BER) performance than the existing schemes. Keywords-TASCMA, Sparse spread spectrum, Antenna allo⌉cation, Beamforming, MPA.


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    Title :

    Joint Time and Angle Domain Sparse Code Multiple Access for mmWave Systems


    Contributors:
    Yu, Xiaoxia (author) / Zhang, Zhaoyang (author) / Wang, Jue (author) / Song, Xuran (author)


    Publication date :

    2019-09-01


    Size :

    945081 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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