Beam-switching-Assisted CMA Initialization for Handset Adaptive Antenna

Boonpoonga, Akkarat; Sirisuk, P.; Phongcharoenpanich, Chuwong; Krairiksh, M.

doi:10.1109/rws.2007.351872

Cited by 4 publications

(11 citation statements)

References 6 publications

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“…Furthermore, in case (a), the convergence property of CMA with and without onoff algorithm seems to be slow because the angle space between desired and interference signals is small [16]. In case (b), the SINR trajectories obtained from the antenna using CMA with and without on-off algorithm are almost identical because an initial beam obtained from on-off algorithm is identical to that one without on-off algorithm.…”

Section: Simulationsmentioning

confidence: 98%

“…By selecting feed probes properly, the same radiation patterns as in [17] could be obtained with less sophisticated antenna fabrication [19]. The PASE using switched-probe elements was utilized for initializing CMA to improve convergence rate of the previous work in [16] and was revealed that the antenna could mitigate the effect of two interference signals [20].…”

Section: Introductionmentioning

confidence: 99%

“…In our proposed system, a flat four beam antenna was employed as a receiving antenna to provide four radiation patterns in azimuth plane simply using one bit phase shifters [15]. A main beam with maximum received power was employed as an initial beam for CMA to improve convergence rate [16]. When square patches of one-wavelength width that provided switched-beam patterns [17] were utilized in a phased array in [15], a variety of radiation patterns could be produced by selecting appropriate element patterns in each array element together with one-bit phase shifters.…”

Section: Introductionmentioning

confidence: 99%

“…Although the techniques in [16] and [20] do improve the convergence behavior, the hardware circuitry increases the size and the cost of the system, and the phase shifters also cause some signal loss. Digital beam synthesis [21] was proposed to digitally synthesize beams in different directions instead of using phase shifters.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adaptive Array Antenna Using On-Off and CMA Algorithms for Microwave RFID Readers

Tantisopharak

Boonpoonga

Phongcharoenpanich

et al. 2011

IEICE Trans. Commun.

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SUMMARYThis paper proposes an adaptive antenna using a combination of on-off and CMA algorithms. With the proposed technique, the on-off algorithm is first employed to search for a desired signal direction in which maximum received power is achieved. Then, interference is suppressed by performing CMA. Simulations are conducted according to the potential application of the proposed adaptive antenna. The simulation results show the SINR improvement implying that the proposed adaptive antenna can be applied to microwave RFID systems in order to resolve reader collision. Furthermore, the proposed adaptive antenna is implemented and then experimented. The experimental results verify that the proposed adaptive antenna can reduce interference resulting in the collision problem.

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Section: Simulationsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adaptive Array Antenna Using On-Off and CMA Algorithms for Microwave RFID Readers

Tantisopharak

Boonpoonga

Phongcharoenpanich

et al. 2011

IEICE Trans. Commun.

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“…Here, Į is a progressive phase between each element, which can be obtained from [5] 0 0 sin cos n n ka D T I I (6) where 0…”

Section: A Proposed Systemmentioning

confidence: 99%

Simple initialization scheme for CMA adaptive antenna by using digital beam synthesis

Tantisopharak

Boonpoonga

Sirisuk

et al. 2008

2008 5th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

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This paper presents a simple technique of initialization for CMA adaptive antenna. The technique utilizes digital beam synthesis for a circular array antenna to synthesize the beams in digital domain. The synthesized beam can be switched into different directions by choosing proper weight vectors. The weight vectors are calculated through a phased array principle. The beams obtained from the synthesis are employed to initial CMA in order to improve its convergence property. The technique makes the compact adaptive antenna using CMA possible. Simulation results show that the proposed technique can significantly improve the convergence property of CMA.

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Stabilised blind interference suppression of constant modulus‐based adaptive array over Rayleigh fading channels by initial antenna selection

Maruta¹,

Ahn²

2019

IET Microwaves, Antennas & Propagation

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This article proposes an initial antenna selection for constant modulus‐based blind interference suppression algorithms to stabilise their prominent interference suppression performance. Constant modulus algorithm (CMA) is a well‐known blind adaptive array scheme, but it cannot suppress the interference when signal‐to‐interference power ratio (SIR) is <0 dB. It faces strong limits on their applicable region over Rayleigh fading channels where instantaneous channel gain fluctuates over 10 dB range. Even if the expected desired signal strength is larger than interference, CMA may still miscapture the interference and incorrectly suppress the desired signal. The authors’ proposal is simplified approach to select the antenna element whose reception power is maximal. Certain antenna element can be expected to capture the desired signal precisely under the condition where SIR is statistically positive, so that the CMA processor can utilise it as an initial input. This condition will be ensured by increasing antenna element number, supported by the trends that base station antenna elements are going massive. Computer simulations verifies improved interference suppression performance provided by the proposed scheme. This article also verified applicability for multi‐modulus algorithm to accommodate M‐ary quadrature amplitude modulation (QAM) use.

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Beam-switching-Assisted CMA Initialization for Handset Adaptive Antenna

Cited by 4 publications

References 6 publications

Adaptive Array Antenna Using On-Off and CMA Algorithms for Microwave RFID Readers

Adaptive Array Antenna Using On-Off and CMA Algorithms for Microwave RFID Readers

Simple initialization scheme for CMA adaptive antenna by using digital beam synthesis

Stabilised blind interference suppression of constant modulus‐based adaptive array over Rayleigh fading channels by initial antenna selection

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