Rant Free Random Access News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Grant-free random access is promising in achieving massive connectivity with sporadic transmissions in massive machine type communications (mMTC) for internet of things (IoT) applications, where the hand-shaking between the access point (AP) and users is skipped, leading to high multiple access efficiency. In grant-free random access, the AP needs to identify the active users and perform channel estimation and signal detection. Conventionally, pilot signals are required for the AP to achieve user activity detection and channel estimation before active user signal detection, which may still result in substantial overhead and latency. In this paper, to further reduce the overhead and latency, we investigate the problem of grant-free random access without the use of pilot signals in a millimeter wave (mmWave) multiple input and multiple output (MIMO) system, where the AP performs blind joint user activity detection, channel estimation and signal detection (UACESD). We show that the blind ....

Approximate Message Passing , Channel Estimation , Covariance Matrices , Rant Free Random Access , Nternet Of Things , Massive Machine Type Communications , Message Passing , Illimeter Wave Communication , Millimeter Wave Communications , Imo Communication , Signal Detection , Ser Activity Detection ,