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- Title
Delay constrained throughput optimization in multi-hop AF relay networks, using limited quantized CSI.
- Authors
Taki, Mehrdad; Svensson, Tommy; Nezafati, Mohammad Bagher
- Abstract
In this paper, we analyze the throughput of multi-hop amplify and forward (AF) relay networks in delay-constrained scenario. Using quantized channel state information (CSI), the transmission rates and powers are discretely adapted with individual average power constraint on each node. A sub-gradient projection-based algorithm is utilized, by which there is no need for probability density functions (PDFs) to solve the optimization problem. Our numerical evaluations show that the sub-gradient projection-based algorithm results in a comparable performance with an analytical approach using PDFs. As shown, a considerably better performance obtained by the designed scheme compared to previous schemes with constant power transmission. More than 70% throughput improvement is achieved by our scheme compared to constant power transmission with just two more feedback bits and a short training time required at the beginning of the transmission.
- Subjects
CONSTRAINED optimization; PROBABILITY density function; POWER transmission; PDF (Computer file format); MODULATION coding
- Publication
EURASIP Journal on Wireless Communications & Networking, 2019, Vol 2019, Issue 1, pN.PAG
- ISSN
1687-1472
- Publication type
Article
- DOI
10.1186/s13638-019-1423-3