MMSE Based Interference Processing For Satellite Broadcast Reception (original) (raw)
Reduced front-end reception requirements for satellite broadcast using interference processing
IEEE Transactions on Consumer Electronics, 2000
The problem of fixed satellite broadcast reception is considered. The possibility of reducing the requirements on the antenna front-end dimensions is investigated. Interference processing and mitigation techniques are employed to cope with the increased level of adjacent system interference at the satellite broadcast receiver resulting from the less directive antenna. A novel satellite reception front-end antenna based on a multiple
Decision-directed interference cancellation applied to satellite broadcast reception
2005
This paper investigates the usage of established interference cancellation techniques applied to the simultaneous reception of geostationary satellite broadcast signals from two or more satellites. In particular the reduction of interference from adjacent satellites is of interest, which would allow a reduction of the antenna size and the requirements on the directivity of the installation. The rejection of unwanted adjacent satellite interferers can imply a large equivalent parabolic reflector size to achieve the required spatial separation of the signals. The usage of small and cheap reception antennas at the end-user premises can be facilitated by the reduction of the requirements on the antenna characteristics in terms of adjacent satellite interference rejection, in particular for the joint reception of signals from two or more simultaneous geostationary orbital locations.
Applicability of interference processing to DTH reception
2006
Today fixed satellite broadcast reception has to compete efficiently with other means of broadcast content delivery to end-users. The ease of reception is essential to maintain a high penetration rate under more competitive conditions. The introduction of DVB-S2 increases efficiency and allows for a higher throughput or a reduction of the reception equipment requirements. This means that a robust broadcast reception is conceivable with a reduced direct-to-home (DTH) antenna size. The current interference situation at common geostationary broadcast positions dictates the spatial discrimination requirements of common direct-to-home (DTH) reception antennas. A more robust coding rate or a relaxation of the frequency coordination constraints would obviously relax the requirements on the reception front-end but only at the expense of a reduced aggregate efficiency. The use of known interference processing schemes for DTH reception has been investigated under dual reception path scenarios, see . The present work extends the concept by introducing linear pre-processing (LPP) to combine coherent reception paths. These mechanisms will only be practical if the transmitted broadcast signals are compliant with established standards (ie. DVB-S [5] or DVB-S2 [4]). The maximization of the efficiency is a main objective under given reception environments. We show how multiuser detection techniques can increase efficiency and allow reduced antenna size under realistic conditions.
Space-time MMSE receivers for non-ideal multi-satellite channels
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738), 2004
This paper deals with the development of two new schemes of space-time MMSE receivers implemented for the forward link of a WCDMA multi-satellite system and their performance evaluation under non-ideal conditions. A comparison with other two space-time MMSE detectors already presented in the literature is also introduced. In this work the so called space-time transmit diversity technique (STTD) has been coupled with the minimum mean square error (MMSE) interference suppression technique. The idea has come from the realization that the diversity gain is limited by a medium-high level of multiple access interference ([14], [2]). As known, the classical Alamouti STTD ([3]) technique needs symbols synchronicity at the receiver. Firstly, in this paper we drop this need, extending the STTD technique to the asynchronous signals case. The proposed schemes can be distinguished by the order in which the spacetime processing and the MMSE interference suppression are performed. We named ST-MMSE Pre STTD if the MMSE filtering is performed before the space-time combining and ST-MMSE Post STTD if the interference suppression and the space-time combining are jointly processed. The STTD technique is based on the knowledge of the channel coefficients at the receiver. This paper aims also to answer to the following question: what happens when the channel coefficients are not perfectly estimated? Normally, no matter as the estimator is accurate, errors in the channel complex coefficients evaluation occur and the ST-MMSE receivers performance could be strongly degraded. A realistic multi-satellite WCDMA environment has been simulated in order to compare the proposed detectors. Bit error rates have been calculated by mean of Montecarlo simulations assuming a time-varying satellite channel model. The results show that the proposed Post-combining scheme gives the best results, when the estimation errors are not present, but it is more sensitive to the estimation errors than other receivers in the pedestrian channel. Anyway, the receivers, here proposed, still outperform the other schemes presented in literature in the vehicular channel, i.e., when the receiver has a high mobility, although a 30 o of channel phase coefficients estimation error is present. This work has to be intended as an extension of the previous works in [19] and [20].
Interference analysis in satellite cellular systems
[1992 Proceedings] The Third IEEE International Symposium on Personal, Indoor and Mobile Radio Communications
In next generation satellite mobile systems very high spectrum efficiency will be a primary objective. High spectrum efficiency is often related to a significant amount of eo-channel andlor adjacent channel interference. Therefore, system design should in general include consideration of both interference and noise effects. Interference evaluation in a mobile salellite cellular system is different from the case of a terrestrial system due to the presence of the on-board antenna which acts as a spatial filter. The paper addresses the modeling of interference in single and multi-satellite cellular system and provides some results of the analysis.
2014 7th Advanced Satellite Multimedia Systems Conference and the 13th Signal Processing for Space Communications Workshop (ASMS/SPSC), 2014
In the context of satellite communications, random access methods can significantly increase throughput and reduce latency over the network. The recent random access methods are based on multi-user multiple access transmission at the same time and frequency followed by iterative interference cancellation and decoding at the receiver. Generally, it is assumed that perfect knowledge of the interference is available at the receiver. In practice, the interference term has to be accurately estimated to avoid performance degradation. Several estimation techniques have been proposed lately in the case of superimposed signals. In this paper, we present an overview on existing channel estimation methods and we propose an improved channel estimation technique that combines estimation using an autocorrelation based method and the Expectation-Maximization algorithm, and uses pilot symbol assisted modulation to further improve the performance and achieve optimal interference cancellation.
Cognitive Interference Cancellation with Digital Channelizer for Satellite Communication
Sensors
The concept of Internet of Things (IoT) has attracted much research attention for the realization of a smart society. However, the radio transmission coverage of the existing IoT solutions is not enough to connect lots of devices deployed over wide areas. Therefore, satellite networks have been considered as one of the most attractive solutions to wide cell coverage of IoT, i.e., global-scaled IoT. In satellite communication, a digital channelizer is one of the most significant parts that support multiple transponders. Owing to their wide coverage, satellite communication systems are more vulnerable to interference than other types of wireless communication systems. In this study, a cognitive interference cancellation using the inherent properties of a digital channelizer is considered. The proposed method detects a subchannel corrupted by interference and omits it. A simple energy detection method and a modified version are proposed for detection of interference. In the modified (i...
Interference Mitigation Techniques for Broadband Satellite Systems
24th AIAA International Communications Satellite Systems Conference, 2006
This paper presents an overview of possible interference mitigation techniques aiming at increasing the system capacity of broadband multimedia satellite systems. A multi-star network topology using a bent-pipe transparent satellite is assumed. After a general overview, the paper concentrates on the assessment of Linear Precoding techniques for increasing the potential system capacity on the Forward Link. Potential performance improvements achievable in real systems are investigated as well as resulting system constraints.
Analysis and Performance of MIMO-OFDM in Mobile Satellite Broadcasting Systems
2010 IEEE Global Telecommunications Conference GLOBECOM 2010, 2010
The mobile satellite broadcasting arena is witnessing a constant increase in demand for improved transmission quality and higher number of services in order to remain on par with the corresponding terrestrial counterparts. A promising way forward in this regard is the migration from the conventional single polarization per beam to an advanced dual polarization per beam architecture for effective spectrum exploitation; this also enables the application of advanced multiple antenna (MIMO) techniques. The present paper moves from DVB-SH -the current state-of-the-art for mobile satellite services-towards a more advanced system architecture doubling the overall system capacity with a minimum power increase. It turns out that a multiplexing gain equal to two comes at a cost of about 6 dB for the conventional single polarization system, whereas for the advanced system the corresponding cost is about 3.5 dB.
MMSE Space-Time Equalization for GSIM Cellular Systems
In this paper, we propose a new receiver structure for GSM cellular systems. The receiver structure consists of an MMSE equalizer to mitigate the channel impairments separately followed by a Viterbi decoder for equalization of the GMSK signal (demodulation). Further, the proposed receiver structure can be incorporated with various antenna diversity schemes at the Base Station (BS) for GSM. Finally, a MMSE Space-Time receiver is proposed to mitigate both ISI and co-channel interferences jointly. The improved performance is verified through simulation results.