Abstract
In this paper, we propose a new vector perturbation scheme which reduces the complexity associated with finding perturbation vectors by searching for the real and imaginary components individually. To minimize a performance loss induced from decoupling joint search, we apply diagonal precoding at the transmitter whose phase angles are iteratively optimized according to the criterion of maximizing the chordal distance between subspaces spanned by the real and imaginary components. Since our main objective is to reduce the system cost, we also propose a simple non-iterative method of finding phase angles with slight performance loss. Simulation results show that the proposed decoupled vector perturbation reduces the average number of search candidate by 56% in comparison to the original vector perturbation in 4-by-4 system. It is also noted that the simple choice of phase angles provides the performance almost identical to that of the iteratively optimized angles. Moreover, we develope a receive antenna combining method for the vector perturbation systems with multiple-antenna receivers. The proposed algorithm designs receive combiners based on the criterion of optimizing the performance metric via a block-coordinate ascent approach.
| Original language | English |
|---|---|
| Title of host publication | IEEE International Conference on Communications |
| DOIs | |
| Publication status | Published - 2010 Aug 13 |
| Event | 2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, South Africa Duration: 2010 May 23 → 2010 May 27 |
Other
| Other | 2010 IEEE International Conference on Communications, ICC 2010 |
|---|---|
| Country | South Africa |
| City | Cape Town |
| Period | 10/5/23 → 10/5/27 |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Computer Networks and Communications
Cite this
Decoupled search for vector perturbation in multiuser downlink systems. / Park, Seok Hwan; Han, Hyeon Seung; Lee, Inkyu.
IEEE International Conference on Communications. 2010. 5501933.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Decoupled search for vector perturbation in multiuser downlink systems
AU - Park, Seok Hwan
AU - Han, Hyeon Seung
AU - Lee, Inkyu
PY - 2010/8/13
Y1 - 2010/8/13
N2 - In this paper, we propose a new vector perturbation scheme which reduces the complexity associated with finding perturbation vectors by searching for the real and imaginary components individually. To minimize a performance loss induced from decoupling joint search, we apply diagonal precoding at the transmitter whose phase angles are iteratively optimized according to the criterion of maximizing the chordal distance between subspaces spanned by the real and imaginary components. Since our main objective is to reduce the system cost, we also propose a simple non-iterative method of finding phase angles with slight performance loss. Simulation results show that the proposed decoupled vector perturbation reduces the average number of search candidate by 56% in comparison to the original vector perturbation in 4-by-4 system. It is also noted that the simple choice of phase angles provides the performance almost identical to that of the iteratively optimized angles. Moreover, we develope a receive antenna combining method for the vector perturbation systems with multiple-antenna receivers. The proposed algorithm designs receive combiners based on the criterion of optimizing the performance metric via a block-coordinate ascent approach.
AB - In this paper, we propose a new vector perturbation scheme which reduces the complexity associated with finding perturbation vectors by searching for the real and imaginary components individually. To minimize a performance loss induced from decoupling joint search, we apply diagonal precoding at the transmitter whose phase angles are iteratively optimized according to the criterion of maximizing the chordal distance between subspaces spanned by the real and imaginary components. Since our main objective is to reduce the system cost, we also propose a simple non-iterative method of finding phase angles with slight performance loss. Simulation results show that the proposed decoupled vector perturbation reduces the average number of search candidate by 56% in comparison to the original vector perturbation in 4-by-4 system. It is also noted that the simple choice of phase angles provides the performance almost identical to that of the iteratively optimized angles. Moreover, we develope a receive antenna combining method for the vector perturbation systems with multiple-antenna receivers. The proposed algorithm designs receive combiners based on the criterion of optimizing the performance metric via a block-coordinate ascent approach.
UR - http://www.scopus.com/inward/record.url?scp=77955362847&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77955362847&partnerID=8YFLogxK
U2 - 10.1109/ICC.2010.5501933
DO - 10.1109/ICC.2010.5501933
M3 - Conference contribution
AN - SCOPUS:77955362847
SN - 9781424464043
BT - IEEE International Conference on Communications
ER -