Adaptive antenna arrays for reducing the delay spread in indoor radio channels

Passerini, C.; Missiroli, M.; Riva, G.; Frullone, M.

doi:10.1049/el:19960191

Cited by 11 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This causes the impulse response of the indoor radio channel to appear like a series of pulses [103]. The use of adaptive antennas to improve such channels is discussed in [104].…”

Section: B Indoor-mobile Radio Systemmentioning

confidence: 99%

“…3) Nulling Delayed Arrivals: A reduction in delay spread using an array by nulling the delayed signals arriving from different directions has been reported in [100] and [104]. The simulation study presented in [104] considers indoor radio channels, uses a PN sequence as a reference signal and the SMI algorithm to estimate the array weights, and concludes that using an adaptive array, a substantial reduction in delay spread is possible.…”

Section: A Reduction In Delay Spread and Multipath Fadingmentioning

confidence: 99%

“…The simulation study presented in [104] considers indoor radio channels, uses a PN sequence as a reference signal and the SMI algorithm to estimate the array weights, and concludes that using an adaptive array, a substantial reduction in delay spread is possible. Similar conclusions are reached in [100] using an experimental array of four elements mounted on a vehicle.…”

Section: A Reduction In Delay Spread and Multipath Fadingmentioning

confidence: 99%

See 2 more Smart Citations

Applications Of Antenna Arrays To Mobile Communications, Part I: Performance Improvement, Feasibility, And System Considerations

1997

Proc. IEEE

View full text Add to dashboard Cite

“…This causes the impulse response of the indoor radio channel to appear like a series of pulses [103]. The use of adaptive antennas to improve such channels is discussed in [104].…”

Section: B Indoor-mobile Radio Systemmentioning

confidence: 99%

Section: A Reduction In Delay Spread and Multipath Fadingmentioning

confidence: 99%

Section: A Reduction In Delay Spread and Multipath Fadingmentioning

confidence: 99%

See 1 more Smart Citation

Applications Of Antenna Arrays To Mobile Communications, Part I: Performance Improvement, Feasibility, And System Considerations

1997

Proc. IEEE

View full text Add to dashboard Cite

“…A straightforward method to increase the bandwidth can be found from the theory describing the relationship between the frequency selective fading and the multipath delay spread: the larger the delay spread is, the narrower the coherence bandwidth is 8, and the use of antenna array for its effects in reducing the delay spread 9, 10, 11. The above researches are found mainly in fields of the mobile communications.…”

Section: Introductionmentioning

confidence: 99%

Studies on the coherence bandwidth of high‐frequency vehicular communication system with antenna array

Li¹,

Duan²,

Ma³

et al. 2011

Wireless Communications

View full text Add to dashboard Cite

High-frequency (HF) vehicular communication system works with the frequency-selective fading channel, thereby the coherence bandwidth is limited due to the multipath time dispersive effect, which imposes the difficulty for achieving the high-data rate transmission. The present paper investigates the antenna array technique for its ability in reducing the multipath delay spread of the ionosphere channel and, thus, increasing possibly the bandwidth of the HF system. To enable fast moving speed of the vehicular receiver, we propose to use single antenna at the receiver and the adaptive array at the transmitter. The adaptive beamforming is driven based on the protocol design and reciprocity principle of channel. In order to evaluate the performance of array system, a statistical HF double-directional channel model, which includes angular information at both the transmitter and receiver, is presented. The explicit expressions are obtained for calculating the coherence bandwidth. The numerical results show the efficiency of this approach for mid-latitude mid-range channel.

show abstract

“…Over the decades, the research expanded to provide improvement in convergence, tracking, robustness, power consumption, and versatility of the signal-processing algorithms [2,6,14,15]. In addition, research in adaptive array applications was extended in the areas of radar [16,17] and varying communications systems, such as spread spectrum, TDMA, CDMA, TOA, and indoor radio [18][19][20][21][22][23][24][25]. A third major area of research for adaptive arrays is the effect of the antenna array design itself on its performance in the adaptive mode [26][27][28][29][30][31][32][33][34][35][36][37].…”

mentioning

confidence: 99%

The Effect of Mutual Coupling on the Nulling Performance of Adaptive Antennas

Svendsen

Gupta

2012

IEEE Antennas Propag. Mag.

View full text Add to dashboard Cite

The effect of mutual coupling on the performance of adaptive antennas has been a topic of considerable interest for the last three decades. The general conclusion of the work reported in the open literature is that mutual coupling degrades the performance of adaptive antennas. We have carried out an in-depth study of the effects of mutual coupling on the performance of adaptive antennas. Our studies show that this conclusion is not entirely correct. Yes, one does need the in-situ array manifold to obtain the fi xed response in the desired signal direction. Otherwise, adaptive weights can also suppress the desired signal. Note that for adaptive antennas based on minimizing the mean squared error between the array output and a locally generated reference signal, this is not an issue. However, mutual coupling between antenna elements hardly affects the nulling performance of adaptive antennas. In fact, in a given size aperture, as the number of antenna elements is increased, one obtains better nulling performance, irrespective of the increased mutual coupling between antenna elements. Also, as expected, for strong wideband interfering signals, one should carry out space-time adaptive processing (STAP).A daptive-antenna array systems constitute a multidisci pline technology area that has spanned a number of dec ades in the engineering and scientifi c community, due to advances in electromagnetics and signal processing [1][2][3][4][5][6][7][8]. Adaptive arrays consist of antenna elements that sense the signal environment, and a real-time signal processor that automatically optimizes a user-defi ned metric, such as signal-to-noise ratio (SNR), by combining the weighted output of each element (or channel). Adaptive antennas thus can provide real-time adaptive nulling and beamforming. They have appli cations in radar, navigation, RF communication systems, seismic analysis, and sonar [8].The origins of adaptive nulling can be found in the 1960s, when a sidelobe canceller was developed to aid in radar applications [9], and the least-mean-square (LMS) error algorithm was established based on the steepest-descent method [10]. Both of these contributions enabled automatic interference suppression without knowledge of the interferers. Therefore, a weak desired signal can be extracted from a environment with strong interferers [11]. Experimental verifi cation of adaptive nulling was given in [12,13]. Over the decades, the research expanded to provide improvement in convergence, tracking, robustness, power consumption, and versatility of the signal-processing algorithms [2,6,14,15]. In addition, research in adaptive array applications was extended in the areas of radar [16,17] and varying communications systems, such as spread spectrum, TDMA, CDMA, TOA, and indoor radio [18][19][20][21][22][23][24][25]. A third major area of research for adaptive arrays is the effect of the antenna array design itself on its performance in the adaptive mode [26][27][28][29][30][31][32][33][34][35][36][37]. The element pattern [26,27,31], distrib...

show abstract

Adaptive antenna arrays for reducing the delay spread in indoor radio channels

Cited by 11 publications

References 4 publications

Applications Of Antenna Arrays To Mobile Communications, Part I: Performance Improvement, Feasibility, And System Considerations

Applications Of Antenna Arrays To Mobile Communications, Part I: Performance Improvement, Feasibility, And System Considerations

Studies on the coherence bandwidth of high‐frequency vehicular communication system with antenna array

The Effect of Mutual Coupling on the Nulling Performance of Adaptive Antennas

Contact Info

Product

Resources

About