Space-Time Block Code Designs for Two-User MIMO X Channels

Shi, Long; Zhang, Wei; Xia, Xiang-Gen

doi:10.1109/tcomm.2013.080613.120972

Cited by 11 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, such an orthogonality can easily be achieved without global CSIT using the time division multiple access scheme (TDMA). Another linear transmission scheme achieving an (asymptotic) sum-rate of four cspcu was proposed in [14] for the (2 × 2) X-Network equipped with M transmit and N receive antennas, without the assumption of channel-state-information at any of the transmitters. Clearly, the sum-rate does not scale with the number of transmit or receive antennas, though full transmit and receive diversity gains are guaranteed.…”

Section: A Prior Work On Diversity Gain In Interference Networkmentioning

confidence: 99%

Interference aligned space-time transmission with diversity for the 2 × 2 X-Network

Ganesan

Srinath

2015

2015 IEEE International Symposium on Information Theory (ISIT)

View full text Add to dashboard Cite

The sum degrees of freedom (DoF) of the two-transmitter, two-receiver multiple-input multipleoutput (MIMO) X-Network (2 × 2 MIMO X-Network) with M antennas at each node is known to be 4M 3 . Transmission schemes which couple local channel-state-information-at-the-transmitter (CSIT) based precoding with space-time block coding to achieve the sum-DoF of this network are known specifically for M = 2, 4. These schemes have been proven to guarantee a diversity gain of M when a finite-sized input constellation is employed. In this paper, an explicit transmission scheme that achieves the 4M 3 sum-DoF of the 2 × 2 X-Network for arbitrary M is presented. The proposed scheme needs only local CSIT unlike the Jafar-Shamai scheme which requires the availability of global CSIT in order to achieve the 4M 3 sum-DoF. Further, it is shown analytically that the proposed scheme guarantees a diversity gain of M + 1 when finite-sized input constellations are employed.Freedom.that cell edge users are susceptible to interference from the neighbouring base stations and vice-versa.These issues have instigated research on better transmission techniques in interference networks, with information-theoretic rate tuples often used as the metric for designing better schemes. Since the capacity of interference networks is unknown in general, degrees of freedom (DoF) [1] is the widely targeted metric due to its relative ease of characterization. The sum-DoF of a Gaussian network is said to be d if its sum-capacity (in bits per channel use) can be approximated as C(SNR) = d log 2 SNR + o(log 2 SNR).Availability of channel-state-information at the transmitters (CSIT) is an important assumption in the characterization of the approximate capacity of Gaussian interference networks. Availability of perfect global CSIT 1 often enables one to design precoders that cast interference onto subspaces independent of the desired signal space at the receivers. This technique, termed interference alignment (IA), was first used implicitly in [2], [3], and explicitly appeared in [4], [5] in the context of 2 × 2 multiple-input multiple-output (MIMO) X-Networks. A K × J X-Network is a Gaussian interference network with K transmitters and J receivers and a total of KJ independent messages meant to be sent over the network, one from every transmitter to every receiver. A 2×2 X-Network with M antennas at each node is referred to as the (2 × 2, M ) X-Network. A lower bound on the sum-DoF was shown to be 4M 3 for such a network in [3], and it was proven in [5] that the sum-DoF equals 4M 3 , achieved using an IA scheme. All the aforementioned works assume the availability of perfect global CSIT.The concept of DoF assumes the use of a codebook with unconstrained alphabet size as well as unlimited peak power, but with an average power constraint. The channel is assumed to be static during the transmission of an entire codeword. Further, information-theoretic rate definitions also assume the usage of unlimited coding length. Clearly, all these assumptions are infeasible in p...

show abstract

Section: A Prior Work On Diversity Gain In Interference Networkmentioning

confidence: 99%

Interference aligned space-time transmission with diversity for the 2 × 2 X-Network

Ganesan

Srinath

2015

2015 IEEE International Symposium on Information Theory (ISIT)

View full text Add to dashboard Cite

show abstract

“…Kim rate maximization in terms of sum DoF, recent works [6]- [11] focused on improving diversity gain in interference channels. Linear transmission schemes were proposed in [6], [7] to achieve full diversity gain in the two X-channel equipped with arbitrary numbers of antennas at the transmitters and receivers. However, they could not achieve the sum DoF that scales with the number of antennas at the transmitters and receivers.…”

Section: Introductionmentioning

confidence: 99%

On-off Switched Interference Alignment for Diversity Multiplexing Tradeoff Improvement in the 2-User X-Network With Two Antennas

Kim

Kang

Choi

2019

IEEE Trans. Wireless Commun.

View full text Add to dashboard Cite

To improve diversity gain in an interference channel and hence to maximize diversity multiplexing tradeoff (DMT), we propose on-off switched interference alignment (IA) where IA is intermittently utilized by switching IA on/off. For on-off switching, either IA with symbol extension or IA with Alamouti coding is adopted in this paper. Deriving and analyzing DMT of the proposed schemes, we reveal that the intermittent utilization of IA with simultaneous non-unique decoding can improve DMT in the 2-user X-channel with two antennas. Both the proposed schemes are shown to achieve diversity gain of 4 and DoF per user of 4 3 . In particular, the on-off switched IA with Alamouti coding, to the best of our knowledge, surpasses any other existing schemes for the 2-user X-channel with two antennas and nearly approaches the ideal DMT.

show abstract

“…With high DoF, reliability in terms of the diversity gain is needed to be improved. Therefore, it is meaningful to combine interference alignment and space-time code, which can offer diversity gain [7] [8]. [9] proposes a new interference alignment scheme using Alamouti code for two users MIMO X channel, in which zero vector is introduced into each codeword.…”

Section: Introductionmentioning

confidence: 99%

Interference Cancellation Method without Feedback Amount for Three Users Interference Channel

Tian¹,

Zhang²,

Jia³

2017

OALib

View full text Add to dashboard Cite

In this paper, we investigate how to cancel multi-user interference without feedback amount over multiple-input multiple-output (MIMO) interference channel using space-time code. Three transmitter-receiver pairs are considered and each node is equipped with four antennas. Space-time codeword with dimension 4 × 4 is designed for three transmitters, respectively. The number of interfering codeword is reduced through the design of codeword. Then, multi-user interference is cancelled by a linear operation on the received signals. Compared with the existing scheme for the same scene, the transmission efficiency is improved, and the unidirectional cooperative link is not required. Simulation results demonstrate the validity of theoretical analysis.

show abstract

Space-Time Block Code Designs for Two-User MIMO X Channels

Cited by 11 publications

References 23 publications

Interference aligned space-time transmission with diversity for the 2 × 2 X-Network

Interference aligned space-time transmission with diversity for the 2 × 2 X-Network

On-off Switched Interference Alignment for Diversity Multiplexing Tradeoff Improvement in the 2-User X-Network With Two Antennas

Interference Cancellation Method without Feedback Amount for Three Users Interference Channel

Contact Info

Product

Resources

About

Space-Time Block Code Designs for Two-User MIMO X Channels

Cited by 11 publications

References 23 publications

Interference aligned space-time transmission with diversity for the 2 &#x00D7; 2 X-Network

Interference aligned space-time transmission with diversity for the 2 &#x00D7; 2 X-Network

On-off Switched Interference Alignment for Diversity Multiplexing Tradeoff Improvement in the 2-User X-Network With Two Antennas

Interference Cancellation Method without Feedback Amount for Three Users Interference Channel

Contact Info

Product

Resources

About

Interference aligned space-time transmission with diversity for the 2 × 2 X-Network

Interference aligned space-time transmission with diversity for the 2 × 2 X-Network