Efficient random multiple-access using iterative interference cancelation receivers

Grinewitschus, Lukas; Schlegel, Christian

doi:10.1109/aero.2018.8396563

Cited by 2 publications

(1 citation statement)

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“…Other improvements are presented in e.g. [5,6,7,8,9]. Many of the works in this domain assume an error free transmission, and the loss is only due to collisions that are not resolved.…”

Section: Introductionmentioning

confidence: 99%

Two-Layer Coded Channel Access With Collision Resolution: Design and Analysis

Ebrahimi

Lahouti

Kostina

2020

IEEE Trans. Wireless Commun.

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We propose a two-layer coding architecture for communication of multiple users over a shared slotted medium enabling joint collision resolution and decoding. Each user first encodes its information bits with an outer code for reliability, and then transmits these coded bits with possible repetitions over transmission time slots of the access channel. The transmission patterns are dictated by the inner collision-resolution code and collisions with other users' transmissions may occur. We analyze two types of codes for the outer layer: long-blocklength LDPC codes, and short-blocklength algebraic codes. With LDPC codes, a density evolution analysis enables joint optimization of both outer and inner code parameters for maximum throughput. With algebraic codes, we invoke a similar analysis by approximating their average erasure correcting capability while assuming a large number of active transmitters. The proposed low-complexity schemes operate at a significantly smaller gap to capacity than the state of the art. Our schemes apply both to a multiple access scenario where number of users within a frame is known a priori, and to a random access scenario where that number is known only to the decoder. In the latter case, we optimize an outage probability due to the variability in user activity.

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“…Other improvements are presented in e.g. [5,6,7,8,9]. Many of the works in this domain assume an error free transmission, and the loss is only due to collisions that are not resolved.…”

Section: Introductionmentioning

confidence: 99%