Cooperative MIMO relay beamforming in overloaded DS/CDMA multicast networks

A new beamforming scheme is proposed for multi-input multi-output (MIMO) non-regenerative relays in an overloaded synchronous direct sequence code division multiple access (DS-CDMA) network in which the number of users is larger than the processing gain. In this scheme, several transmitters multicas...

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Vydáno v:IET communications Ročník 11; číslo 3; s. 344 - 354
Hlavní autoři: Mehrizi, Sajad, Mahboobi, Behrad
Médium: Journal Article
Jazyk:angličtina
Vydáno: The Institution of Engineering and Technology 16.02.2017
Témata:
antenna number
array signal processing
Beamforming
code division multiple access
computational complexity
concave programming
cooperative communication
cooperative MIMO relay beamforming
DC programming method
difference‐of‐two convex functions
direct sequence code division multiple access network
indefinite quadratic programming
Interference
MIMO communication
MIMO‐CDMA scheme
Multicast
multiinput multioutput nonregenerative relays
multiple‐access interference
Networks
nonconvex programming
optimisation problem
overloaded synchronous DS‐CDMA multicast networks
Programming
radiofrequency interference
Receivers
Relay
relay networks (telecommunication)
SDP
SINR constraint
SOCP
spread spectrum communication
total relay transmission power minimization
Transmitters
nonconvex programming
spread spectrum communication
optimisation problem
radiofrequency interference
SINR constraint
multiinput multioutput nonregenerative relays
difference-of-two convex functions
total relay transmission power minimization
MIMO communication
concave programming
SDP
relay networks (telecommunication)
array signal processing
overloaded synchronous DS-CDMA multicast networks
DC programming method
code division multiple access
multiple-access interference
cooperative communication
direct sequence code division multiple access network
SOCP
cooperative MIMO relay beamforming
MIMO-CDMA scheme
indefinite quadratic programming
antenna number
computational complexity
ISSN:1751-8628, 1751-8636
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Shrnutí:A new beamforming scheme is proposed for multi-input multi-output (MIMO) non-regenerative relays in an overloaded synchronous direct sequence code division multiple access (DS-CDMA) network in which the number of users is larger than the processing gain. In this scheme, several transmitters multicast their data to their groups of receivers through MIMO relays and DS-CDMA technique is utilised to decrease the level of multiple access interference (MAI) at the relays and the receivers. At the relays, the data of transmitters are despread, beamformed and re-spread. The aim of the beamformer is to minimise the total relays transmission power subject to the signal to interference and noise ratio (SINR) constraints at the receivers. This optimisation problem is an indefinite quadratic (non-convex) programming. Semi-definite programming (SDP) and second-order cone programming (SOCP) are two existing methods to solve the problem. However, they, respectively, suffer from high computational complexity and performance degradation when the number of antennas or users increase. To effectively mitigate these deficiencies, we propose a novel DC (difference of two convex functions) programming method. Our simulation results demonstrate the computational advantage of the proposed DC programming over SDP, while a better performance over SOCP is achieved. Moreover, the superiority of the proposed MIMO-CDMA scheme over other multiplexing schemes is shown by several scenarios.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2016.0610