A simple space-time coding technique for wireless communication systems

Anoh, Kelvin; Jones, S. M. R.; Abd‐Alhameed, Raed A.; Mapoka, Trust T.; Okorafor, G. N.; Ngala, Mohammad

doi:10.1109/itecha.2015.7317436

Cited by 3 publications

(11 citation statements)

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“…Initially, this present work was first introduced in [1] for multiple input single output (MISO) systems; we extend our results to include large-antenna (N T > 4), MIMO, receivers up to N R = 2 receiving antennas and spectrally-efficient modulation schemes (e.g., 16 quadrature amplitude modulation (QAM) and 128 QAM). Large antenna systems provide three advantages, namely: the effect of small-scale fading is averaged out; the random channel between N T and N R become pairwise orthogonal as the elements grow; and lastly, it allows for transmit power efficiency in massive MIMO [20].…”

Section: Introductionmentioning

confidence: 62%

“…For example, the ISI-free QO-STBC is achieved through the rotation of one-half of the symbol constellation set [35][36][37], multidimensional rotation [38][39][40], Givens-rotations [16], EVD [17,18] and Hadamard matrices [1,17]. Although the EVD approach is less complex and will be followed, the results can be enhanced if an equivalent modal matrix can be derived without zeros terms.…”

Section: Full-diversity Qo-stbc Using Evd and The Proposedmentioning

confidence: 99%

“…Note that if the channel is defined as (12), the linear model will be expressed as (1). On the other hand, if the system has channel coefficients given by h = {h i } N T i=1 , then the system can be described (in linear form) as (4).…”

Section: Definition 1 [1]mentioning

confidence: 99%

“…These modern techniques dispensing with the large number of antennas also enable spectral efficiency and increased transmit-energy efficiency, although all antennas do not contribute equally [1][2][3][4]. This is laudable in the study of massive MIMO (mMIMO) systems that are being pursued by researchers and industrialists alike for coping with the growing demand for higher data rates in modern telecommunication services.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, it is difficult to decouple transmitted symbols using linear processing at the receiver of a standard QO-STBC system. Consequently, several solutions have been offered by researchers to eliminate the ISI, namely using Givens-rotation [16], eigenvalue decomposition (EVD) [17,18] and Hadamard matrices [1,17]. Although both the Givens-rotation technique and the EVDs approach yielded similar results [19], the EVD method is less complex to implement.…”

Section: Introductionmentioning

confidence: 99%

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Full-Diversity QO-STBC Technique for Large-Antenna MIMO Systems

et al. 2017

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The need to achieve high data rates in modern telecommunication systems, such as 5G standard, motivates the study and development of large antenna and multiple-input multiple-output (MIMO) systems. This study introduces a large antenna-order design of MIMO quasi-orthogonal space-time block code (QO-STBC) system that achieves better signal-to-noise ratio (SNR) and bit-error ratio (BER) performances than the conventional QO-STBCs with the potential for massive MIMO (mMIMO) configurations. Although some earlier MIMO standards were built on orthogonal space-time block codes (O-STBCs), which are limited to two transmit antennas and data rates, the need for higher data rates motivates the exploration of higher antenna configurations using different QO-STBC schemes. The standard QO-STBC offers a higher number of antennas than the O-STBC with the full spatial rate. Unfortunately, also, the standard QO-STBCs are not able to achieve full diversity due to self-interference within their detection matrices; this diminishes the BER performance of the QO-STBC scheme. The detection also involves nonlinear processing, which further complicates the system. To solve these problems, we propose a linear processing design technique (which eliminates the system complexity) for constructing interference-free QO-STBCs and that also achieves full diversity using Hadamard modal matrices with the potential for mMIMO design. Since the modal matrices that orthogonalize QO-STBC are not sparse, our proposal also supports O-STBCs with a well-behaved peak-to-average power ratio (PAPR) and better BER. The results of the proposed QO-STBC outperform other full diversity techniques including Givens-rotation and the eigenvalue decomposition (EVD) techniques by 15 dB for both MIMO and multiple-input single-output (MISO) antenna configurations at 10 −3 BER. The proposed interference-free QO-STBC is also implemented for 16 × N R and 32 × N R MIMO systems, where N R ≤ 2. We demonstrate 8, 16 and 32 transmit antenna-enabled MIMO systems with the potential for mMIMO design applications with attractive BER and PAPR performance characteristics.

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Section: Introductionmentioning

confidence: 62%