Back to Search
Start Over
A Generalized Zero-Forcing Precoder with Successive Dirty-Paper Coding in MISO Broadcast Channels
- Publication Year :
- 2017
- Publisher :
- arXiv, 2017.
-
Abstract
- In this paper, we consider precoder designs for multiuser multiple-input-single-output (MISO) broadcasting channels. Instead of using a traditional linear zero-forcing (ZF) precoder, we propose a generalized ZF (GZF) precoder in conjunction with successive dirty-paper coding (DPC) for data-transmissions, namely, the GZF-DP precoder, where the suffix \lq{}DP\rq{} stands for \lq{}dirty-paper\rq{}. The GZF-DP precoder is designed to generate a band-shaped and lower-triangular effective channel $\vec{F}$ such that only the entries along the main diagonal and the $\nu$ first lower-diagonals can take non-zero values. Utilizing the successive DPC, the known non-causal inter-user interferences from the other (up to) $\nu$ users are canceled through successive encoding. We analyze optimal GZF-DP precoder designs both for sum-rate and minimum user-rate maximizations. Utilizing Lagrange multipliers, the optimal precoders for both cases are solved in closed-forms in relation to optimal power allocations. For the sum-rate maximization, the optimal power allocation can be found through water-filling, but with modified water-levels depending on the parameter $\nu$. While for the minimum user-rate maximization that measures the quality of the service (QoS), the optimal power allocation is directly solved in closed-form which also depends on $\nu$. Moreover, we propose two low-complexity user-ordering algorithms for the GZF-DP precoder designs for both maximizations, respectively. We show through numerical results that, the proposed GZF-DP precoder with a small $\nu$ ($\leq\!3$) renders significant rate increments compared to the previous precoder designs such as the linear ZF and user-grouping based DPC (UG-DP) precoders.<br />Comment: 31 pages, 13 figures, submitted to IEEE Transactions on Wireless Communications in Aug. 2016
- Subjects :
- Discrete mathematics
FOS: Computer and information sciences
Computer Science - Information Theory
Applied Mathematics
Information Theory (cs.IT)
020206 networking & telecommunications
020302 automobile design & engineering
02 engineering and technology
Maximization
Main diagonal
Computer Science Applications
symbols.namesake
0203 mechanical engineering
Broadcast channels
Lagrange multiplier
0202 electrical engineering, electronic engineering, information engineering
Zero Forcing Equalizer
symbols
Dirty paper coding
Electrical and Electronic Engineering
Mathematics
Coding (social sciences)
Communication channel
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....329874f555c7d266b2e9c105fed3c848
- Full Text :
- https://doi.org/10.48550/arxiv.1703.03174