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A Generalized Zero-Forcing Precoder with Successive Dirty-Paper Coding in MISO Broadcast Channels

Hu, Sha LU and Rusek, Fredrik LU (2017) In IEEE Transactions on Wireless Communications 16(6). p.3632-3645
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 datatransmissions, namely, the GZF-DP precoder, where the suffix ‘DP’ stands for ‘dirty-paper’. The GZF-DP precoder is designed to generate a band-shaped and lower-triangular effective channel F such that only the entries along the main diagonal and the v first lower-diagonals can take non-zero values. Utilizing the successive DPC, the known non-causal inter-user interferences from the other (up to) users are canceled through successive encoding. We analyze... (More)
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 datatransmissions, namely, the GZF-DP precoder, where the suffix ‘DP’ stands for ‘dirty-paper’. The GZF-DP precoder is designed to generate a band-shaped and lower-triangular effective channel F such that only the entries along the main diagonal and the v first lower-diagonals can take non-zero values. Utilizing the successive DPC, the known non-causal inter-user interferences from the other (up to) 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 . 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 v. Moreover, we propose two low-complexity user-ordering algorithms for the GZF-DP precoderdesigns for both maximizations, respectively. We show through numerical results that, the proposed GZF-DP precoder with a smallv (<=3) renders significant rate increments compared to the previous precoder designs such as the linear ZF and user-grouping based DPC (UG-DP) precoders. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Transactions on Wireless Communications
volume
16
issue
6
pages
3632 - 3645
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85020901487
  • wos:000403495400038
ISSN
1536-1276
DOI
10.1109/TWC.2017.2686399
language
English
LU publication?
yes
id
1eb3f0ee-c7fc-4222-b6d4-25285d7ddbb4
date added to LUP
2017-03-20 12:52:53
date last changed
2018-01-07 11:56:24
@article{1eb3f0ee-c7fc-4222-b6d4-25285d7ddbb4,
  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 datatransmissions, namely, the GZF-DP precoder, where the suffix ‘DP’ stands for ‘dirty-paper’. The GZF-DP precoder is designed to generate a band-shaped and lower-triangular effective channel F such that only the entries along the main diagonal and the v first lower-diagonals can take non-zero values. Utilizing the successive DPC, the known non-causal inter-user interferences from the other (up to)  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 . 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 v. Moreover, we propose two low-complexity user-ordering algorithms for the GZF-DP precoderdesigns for both maximizations, respectively. We show through numerical results that, the proposed GZF-DP precoder with a smallv (&lt;=3) renders significant rate increments compared to the previous precoder designs such as the linear ZF and user-grouping based DPC (UG-DP) precoders.},
  author       = {Hu, Sha and Rusek, Fredrik},
  issn         = {1536-1276},
  language     = {eng},
  number       = {6},
  pages        = {3632--3645},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Wireless Communications},
  title        = {A Generalized Zero-Forcing Precoder with Successive Dirty-Paper Coding in MISO Broadcast Channels},
  url          = {http://dx.doi.org/10.1109/TWC.2017.2686399},
  volume       = {16},
  year         = {2017},
}