Optimisation of contoured beams for satellite antennas

Patel, P.D.; Chan, K.K.

doi:10.1049/ip-h-2.1985.0071

Cited by 12 publications

(6 citation statements)

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“…Finally conclusions are drawn in Section V. Figure 1. multi-cell model of MSS system As shown in Figure 1, satellite antennas create multiple beams through beam-forming technology [10]- [11], each of which covers a cell respectively. Since the result of beamforming is not ideal, in the case of same frequency network, strong inter-cell interference exists between two vicinal cells.…”

Section: Intruductionmentioning

confidence: 99%

Multi-Cell Interference Cancellation for TD-SCDMA Compatible Mobile Satellite System

Zhu

Ren

2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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In this paper two multi-cell interference cancellation (MCIC) schemes are proposed for the TD-SCDMA compatible mobile satellite service (MSS) system, including the parallel scheme and the serial scheme. In the MCIC schemes inter-cell interference is reconstructed and cancelled with the initial data, which is obtained through traditional single-cell joint detection (SCJD). Both intra-cell and inter-cell interference can be eliminated through the MCIC schemes and the uplink system performance is greatly improved compared with traditional SCJD scheme.Keywords-TD-SCDMA; satellite; MAI; inter-cell; interference cancellation. I. INTRUDUCTIONAs the extension for the cellular mobile communication system, the TD-SCDMA compatible MSS system [1]-[2] is very essential for the integration of the third generation mobile communications system and MSS system. The air interface of the system is compatible with TD-SCDMA, with half frequency division duplexing (HFDD) or frequency division duplexing (FDD) mode.As the other CDMA-based systems, both MAI and ISI cause significant degradations to the uplink performance of this system, including intra-cell interference and inter-cell interference. Joint detection [5], as one linear multiuser detection (MUD) technique [3]-[4] is widely used to eliminate the MAI and ISI within the reference cell. One common JD algorithm is the Minimum mean squared error (MMSE) algorithm [6]. However, traditional single-cell joint detection (SCJD) scheme handles inter-cell interference as white noise, which greatly limits the detection precision. To reduce the interference from the adjacent cells, one inter-cell interference cancellation (ICIC) scheme has been reported previously [7]-[8], which estimates and cancels the adjacent cell interference according to the received signal in the reference cell. For the adjacent cell signal is much weaker than the reference cell signal, the adjacent cell data is not estimated as precious as the reference cell data, which degrades the uplink system performance. For each cell, the estimation of the same adjacent cell is repeated, which wastes resource and increases the computational complexity.In MSS system, because uplink signals from all cells are transferred to the same ground station for unified treatment, received signals and detection results of different cells can be easily shared. Based on this feature, this paper proposes the multi-cell interference cancellation (MCIC) schemes, which makes an improvement for the ICIC scheme. In the MCIC schemes, more than one cell is detected together and the detected results of all cells are shared to avoid repeating estimation. The initial and final user data is obtained respectively in each cell with the SCJD technology. Inter-cell interference is reconstructed and eliminated with initial data of all cells. Both intra-cell and inter-cell interferences are cancelled and the system performance is greatly enhanced.The rest of the paper is organized as the following: Section II describes the system model. In section III the mult...

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Section: Intruductionmentioning

confidence: 99%

Multi-Cell Interference Cancellation for TD-SCDMA Compatible Mobile Satellite System

Zhu

Ren

2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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“…Features such as low cross-polarization, frequency reuse capability, ease of fabrication, and higher reliability make this field attractive for many researchers, resulting in a large number of literature. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Some works focus on far-field representation. [3][4][5] For example, in Reference 3, the synthesis of a multifeed reflector antenna is performed using wavelet expansion of far field.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies discuss optimization algorithm such as the field projection method, 6 field correlation method, 7 adaptive nulling method, 8,9 or popular method of power synthesis optimization. [11][12][13][14][15][16][17][18] It is of note that improvement in the efficiency of the overall pattern synthesis procedure is subject to improvements in the efficiency of synthesis approach and/or optimization algorithm. In the proposed procedure, both aforementioned efficiencies are noticed.…”

Section: Introductionmentioning

confidence: 99%

“…One way for realizing these composite patterns, named as “contoured beams,” is employing the multifeed configuration. Features such as low cross‐polarization, frequency reuse capability, ease of fabrication, and higher reliability make this field attractive for many researchers, resulting in a large number of literature 3‐18 . Some works focus on far‐field representation 3‐5 .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of contoured beam multifeed reflector antenna for optimum coverage

Aryanian

Amini

2020

Micro & Optical Tech Letters

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A synthesis procedure for realizing contoured beams in multifeed reflector antenna is proposed. The proposed procedure solves the synthesis problem so that the maximum gain and low ripple together with low cross polarization are achieved. To this end, first, the relation between the physical parameters of the antenna and the gain loss over the contour is investigated. Then, the maximum achievable gain is approximated, which is needed to study the next issue, that is the optimization procedure. A new optimization procedure is presented, through which the desired contoured beam is achieved. The synthesis procedure employs physical optic (PO) method, which is timeconsuming. To reduce the computational time, which is another focus of the analysis, we introduce an efficient method for computing the PO integral. Through this method, the 3D PO integral is mapped to a 2D integral. The procedure is applied to Brazil coverage. Results show that the cross-polarization is below −20 dB and the gain deviation is less than 1 dB over the contour, which is suitable for satellite communications.

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“…For example, many effective beam synthesis algorithms [3]- [6] and adaptive nulling methods [7], [8] have been available for realizing required radiation patterns. Mayhan derived a general expression for the optimum excitations and successfully predicted the beam forming and nulling performance of the antenna based on this expression [9].…”

Section: Introductionmentioning

confidence: 99%

Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

Zhang

Wang

2004

IEEE Microw. Wireless Compon. Lett.

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In this letter, array-fed reflector or lens antennas are proven by using Fourier analysis methods to follow a kind of frequency-domain principle of pattern multiplication, which states that the spectrum of the composite field of such an antenna is the product of the spectrum of the far field of the individual spot beam and that of the excitation coefficient sequence. This principle will provide a useful and efficient tool not only for determining the optimum excitations but also for predicting the antenna performance.Index Terms-Fourier transform, principle of pattern multiplication, satellite communication, shaped-beam antenna.

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Optimisation of contoured beams for satellite antennas

Cited by 12 publications

References 0 publications

Multi-Cell Interference Cancellation for TD-SCDMA Compatible Mobile Satellite System

Multi-Cell Interference Cancellation for TD-SCDMA Compatible Mobile Satellite System

Synthesis of contoured beam multifeed reflector antenna for optimum coverage

Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

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