Oscillating-beam smart antenna arrays and multicarrier systems: achieving transmit diversity, frequency diversity, and directionality

Zekavat, S.A.; Nassar, C.R.; Shattil, S.

doi:10.1109/tvt.2002.800628

Cited by 19 publications

(15 citation statements)

References 17 publications

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“…This is a direct result of the departure and the arrival of scatterers within the antenna array beam pattern window. Simulation results in [10] and [11] assuming a medium size city center, with 0.0005 <  < 0.05, reveals that time diversity gains as high as L = 7 is achievable using BPS scheme.…”

Section: Bpsmentioning

confidence: 97%

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Beam Pattern Scanning (BPS) versus Space-Time Block Coding (STBC) and Space-Time Trellis Coding (STTC)

Teh

Zekavat²

2009

IJCNS

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In this paper, Beam Pattern Scanning (BPS), a transmit diversity technique, is compared with two well known transmit diversity techniques, space-time block coding (STBC) and space-time trellis coding (STTC). In BPS (also called beam pattern oscillation), controlled time varying weight vectors are applied to the antenna array elements mounted at the base station (BS). This creates a small movement in the antenna array pattern directed toward the desired user. In rich scattering environments, this small beam pattern movement creates an artificial fast fading channel. The receiver is designed to exploit time diversity benefits of the fast fading channel. Via the application of simple combining techniques, BPS improves the probability-of-error performance and network capacity with minimal cost and complexity.In this work, to highlight the potential of the BPS, we compare BPS and Space-Time Coding (i.e., STBC and STTC) schemes. The comparisons are in terms of their complexity, system physical dimension, network capacity, probability-of-error performance, and spectrum efficiency. It is shown that BPS leads to higher network capacity and performance with a smaller antenna dimension and complexity with minimal loss in spectrum efficiency. This identifies BPS as a promising scheme for future wireless communications with smart antennas.

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Section: Bpsmentioning

confidence: 97%

“…This creates a slight motion of the beam pattern directed toward the desired users [10]. Beam pattern movement creates an artificial fast fading environment that leads to time diversity exploitable by the BPS receiver [11]. Beam pattern move- ment is created by applying time varying phase (t) to the elements of antenna array (see Figure 4).…”

Section: Bpsmentioning

confidence: 99%

Beam Pattern Scanning (BPS) versus Space-Time Block Coding (STBC) and Space-Time Trellis Coding (STTC)

Teh

Zekavat²

2009

IJCNS

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“…Recently, the authors have introduced a new antenna array scheme in [3,4,5,6] which offers both (1) high capacity via SDMA and (2) excellent probability-of-error performance at the mobile via its transmit diversity benefits. Both benefits are available while maintaining low mobile receiver complexity.…”

Section: Introductionmentioning

confidence: 99%

“…In the authors' proposed antenna array of [3,4,5,6], a unique, carefully controlled time-varying phase shift is applied to each antenna array element, sweeping the beam pattern directed to the mobile such that (1) the beam pattern maintains a constant large scale fade for the symbol duration T S ; (2) the beam pattern ensures L independent fades within each T S ; (3) after each T S , the antenna beam returns to its initial position, and sweeps same area of space over T S (leading to an oscillating antenna pattern and easing parameter estimation); (4) the movement of the beam pattern, as a percentage of half-power beamwidth (HPBW), is small, allowing the beam pattern to maintain directionality; and (5) the bandwidth expansion due to beam pattern movement is negligible. In this paper, we merge this novel antenna array technique with DS-CDMA systems.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we innovatively apply the oscillating-beam antenna arrays of [3,4,5,6] to DS-CDMA systems with CI chip shapes (CI/DS-CDMA) of [9,10,11,12,13]. This enables (1) very high capacity via the merger of SDMA (directionality of the antenna array) and CDMA (inherent in CI/DS-CDMA); and (2) very high performance via the construction of receivers that exploit both transmit diversity and frequency diversity.…”

Section: Introductionmentioning

confidence: 99%

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High-Performance Wireless via the Merger of CI Chip-Shaped DS-CDMA and Oscillating-Beam Smart Antenna Arrays

Zekavat

Nassar

Shattil³

2004

EURASIP J. Adv. Signal Process.

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We introduce a novel merger of direct sequence code division multiple access (DS-CDMA) and smart antenna arrays. With regard to the DS-CDMA scheme, we employ carrier interferometry DS-CDMA (CI/DS-CDMA), a novel implementation of DS-CDMA where chips are decomposable into narrowband frequency components. With regard to the antenna array, we deploy the oscillating-beam smart array. Here, applying proper time-varying phases to the array elements, we create small movement (oscillation) in the antenna array's pattern, while steering the antenna pattern main lobe to the position of the intended user. The oscillating antenna pattern creates a time-varying channel with a controllable coherence time. This, in turn, provides transmit diversity in the form of a time diversity gain at the mobile receiver side. At the receiver, three stages of combining are available: combining time components of the received signal within symbol duration (each experiencing a different fade) to enhance performance via time diversity; combining frequency components which make up the CI/DS-CDMA chip to enhance the performance via frequency diversity; and combining across chips to eliminate the interfering users on the system. Merging CI/DS-CDMA with the oscillating-beam smart antenna at the base station, we achieve very high capacity via the merger of SDMA (available through directionality of the antenna array) and code division multiple access (inherent in CI/DS-CDMA), and very high performance via the construction of receivers that exploit both transmit diversity and frequency diversity. We present the performance gains of the proposed merger.

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2010

MIMO‐OFDM for LTE, Wi‐Fi and WiMAX

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Oscillating-beam smart antenna arrays and multicarrier systems: achieving transmit diversity, frequency diversity, and directionality

Cited by 19 publications

References 17 publications

Beam Pattern Scanning (BPS) versus Space-Time Block Coding (STBC) and Space-Time Trellis Coding (STTC)

Beam Pattern Scanning (BPS) versus Space-Time Block Coding (STBC) and Space-Time Trellis Coding (STTC)

High-Performance Wireless via the Merger of CI Chip-Shaped DS-CDMA and Oscillating-Beam Smart Antenna Arrays

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