Results 231 to 240 of about 1,344,414 (278)

Mixed Massive Random Access

2020 IEEE 20th International Conference on Communication Technology (ICCT), 2020
In this paper, the massive random access scenario that a part of users transmit both common and user-specific information and the others transmit only common information is considered, and a mixed massive random access scheme is proposed. In the proposed scheme, the common information is transmitted by unsourced random access (URA) technique, and the ...
Zijie Liang, Jianping Zheng
openaire   +1 more source

Contention-based nonorthogonal massive access with massive MIMO

China Communications, 2020
The sporadic communication character of massive machine-type communication systems provides natural advantages to utilize the principle of compressive sensing (CS). However, due to the high computational complexity of CS algorithms, CS-based contention-free access schemes have limited scalability and high computational complexity for massive access ...
Yanna Bai   +3 more
openaire   +1 more source

Massive Random Access in Massive MIMO via Opportunistic Thresholding

ICC 2020 - 2020 IEEE International Conference on Communications (ICC), 2020
Non-orthogonal codes have been recently applied for massive IoT random access to a massive MIMO base station. Activity detection for this extension of on-off random access channel yields a jointly sparse multiple measurement vector (MMV) problem. However, no one investigated the regime when measurements per antenna are very limited but number of ...
Mohammad NaseriTehrani   +1 more
openaire   +1 more source

Preventing massive automated access to web resources

Computers & Security, 2009
Automated web tools are used to achieve a wide range of different tasks, some of which are legal activities, whilst others are considered attacks to the security and data integrity of online services. Effective solutions to counter the threat represented by such programs are therefore required.
BASSO, ALESSANDRO, SICCO, STEFANO
openaire   +2 more sources

Massive Upper Extremity Edema Following Vascular Access Surgery

Annals of Vascular Surgery, 1988
We recently treated three patients with chronic renal failure who required subclavian vein cannulation with Uldall catheters following thrombosis of their arteriovenous fistulae. New arteriovenous fistulae were created in each patient following removal of the Uldall catheters.
R A, McCready   +3 more
openaire   +2 more sources

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