A Generalized Zero-Forcing Precoder with Successive Dirty-Paper Coding in MISO Broadcast Channels
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1eb3f0ee-c7fc-4222-b6d4-25285d7ddbb4
- author
- Hu, Sha LU and Rusek, Fredrik LU
- organization
- publishing date
- 2017-03
- 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
- 2022-05-02 18:36:19
@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 (<=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}}, doi = {{10.1109/TWC.2017.2686399}}, volume = {{16}}, year = {{2017}}, }