Multi-resolution broadcasting over the Grassmann and stiefel manifolds

Hussien, Mohammad T.; Seddik, Karim G.; Gohary, Ramy H.; Shaqfeh, Mohammad; Alnuweiri, Hussein; Yanıkömeroğlu, Halim

doi:10.1109/isit.2014.6875165

Cited by 6 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have shown previously in [1] that restricting the matrix A in (4), which represents the incremental HR information, to possess a unitary structure (drawn from the unitary group U M ) ensures the preservation of the distance characteristics of the non-coherent code. With the restriction that A ∈ U M we can write H d = AH, where d = denotes equality in distribution.…”

Section: Hr Layer (Coherent) Code Constructionmentioning

confidence: 99%

“…In multi-resolution broadcast communication systems two classes of receivers can be identified: low-resolution (LR) receivers, which do not have access to channel state information (CSI) and can only perform non-coherent detection and high-resolution (HR) receivers, which have access to reliable CSI and can perform coherent detection [1]. The LR information constitutes the basic information that must be reliably communicated to both classes of receivers, whereas the HR information constitutes the incremental information that only the HR receivers have access to.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Space-Time Block Codes over the Stiefel Manifold

Hussien

Seddik

Gohary

et al. 2015

2015 IEEE Global Communications Conference (GLOBECOM)

Self Cite

View full text Add to dashboard Cite

In this paper we develop two approaches for designing unitarily-constrained space-time block codes, which are suitable for communicating high-resolution information in layered multiple-input multiple-output broadcast channels. Unlike existing space-time codes, which are usually synthesized from standard phase-shift keying (PSK) or quadrature amplitude modulation constellations, the space-time codes proposed herein are designed using direct optimization over the unitary group. In comparison with conventional unitary space-time block codes, including Alamouti code with PSK constellations, the space-time codes generated by the proposed approaches exhibit significantly better performance, more favorable distance spectra and more effective utilization of the degrees of freedom that underlie the unitary group.

show abstract

Section: Hr Layer (Coherent) Code Constructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Space-Time Block Codes over the Stiefel Manifold

Hussien

Seddik

Gohary

et al. 2015

2015 IEEE Global Communications Conference (GLOBECOM)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Later, the idea of DC-RS was applied to turbo-coded scenarios [23]. From another perspective, a scheme that simultaneously transmits two types of codewords [24][25][26], Grassmann manifold and unitary group, can be considered a similar study because it allows for both coherent and noncoherent detection.…”

Section: Introductionmentioning

confidence: 99%

Boosting Spectral Efficiency With Data-Carrying Reference Signals on the Grassmann Manifold

Endo,

Iimori,

Pradhan

et al. 2024

IEEE Trans. Wireless Commun.

View full text Add to dashboard Cite

In wireless networks, frequent reference signal transmission for accurate channel reconstruction may reduce spectral efficiency. To address this issue, we consider to use a data-carrying reference signal (DC-RS) that can simultaneously estimate channel coefficients and transmit data symbols. Here, symbols on the Grassmann manifold are exploited to carry additional data and to assist in channel estimation. Unlike conventional studies, we analyze the channel estimation errors induced by DC-RS and propose an optimization method that improves the channel estimation accuracy without performance penalty. Then, we derive the achievable rate of noncoherent Grassmann constellation assuming discrete inputs in multi-antenna scenarios, as well as that of coherent signaling assuming channel estimation errors modeled by the Gauss-Markov uncertainty. These derivations enable performance evaluation when introducing DC-RS, and suggest excellent potential for boosting spectral efficiency, where interesting crossings with the non-data carrying RS occurred at intermediate signal-to-noise ratios.

show abstract