Analysis and Design of Communication Techniques in Spectrally Efficient Wireless Relaying Systems

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1 Diss. ETH No Analysis and Design of Communication Techniques in Spectrally Efficient Wireless Relaying Systems A dissertation submitted to the SWISS FEDERAL INSTITUTE OF TECHNOLOGY (ETH) ZURICH for the degree of Doctor of Sciences presented by JIAN ZHAO M.Sc., TU Hamburg-Harburg born May 7, 1979 citizen of China accepted on the recommendation of Prof. Dr. Armin Wittneben, examiner Prof. Dr. Gerhard Bauch, co-examiner 2010

2 Abstract In the past few decades, wireless communication has become one of the fastest growing sectors in the communication industry. In order to satisfy the tremendous growth of demand, wireless service providers are striving to improve the communication systems so that higher data rate wireless transmission can be supported. One of the major breakthroughs for supporting high data rate wireless communications is the multiple-input multiple-output (MIMO) communication technology, i.e., multi-antenna communication. The utilization of multiple antennas provides a significant increase in the reliability and the information transmission rate in wireless systems. After their proposal, multi-antenna communication has been widely adopted as a key solution for providing high data rate throughput in wireless systems. Nowadays, multi-antenna communication techniques are indispensable to most of the wireless communication standards. On the other hand, conventional wireless communication architecture does not seem to be feasible to offer the high data rate transmission required for future generation wireless communication systems in reasonably large areas, e.g., for the fourth generation (4G) cellular wireless networks. Relay communication was proposed as a means to extending the coverage range in wireless networks with reduced infrastructure deployment costs. However, conventional relaying protocols require two channel uses to transmit the data from the source to the destination via the relay, which leads to a loss in the spectral efficiency. The two-way relaying protocol was proposed to recover a significant portion of the spectral efficiency loss. Such a protocol combines the transmission of the bidirectional information flows in relay networks and is simple to implement in practical systems. This dissertation deals with the analysis and design of communication techniques in MIMO relaying systems, especially in MIMO two-way relaying systems. The analysis of the considered system is based on information theoretical performance limits, such as capacity and achievable rates. For the design of communication techniques, we propose practical transmission strategies and show their performance results based on practical performance measures. i

3 Abstract Firstly, we verify that relay communication can extend the coverage of wireless networks, and propose a quantitative analysis framework for determining the coverage extension by using decode-and-forward (DF) relays in cellular wireless systems. We define the coverage of cellular relaying networks based on the achievable rates, and provide theoretical calculations as well as simulations to show the improvement of coverage in cellular relaying systems. Secondly, information-theoretic performance analysis on MIMO two-way relaying systems is proposed. For MIMO two-way DF relaying systems, two data-combining schemes, i.e., the superposition coding (SPC) scheme and the network coding scheme, are studies in detail. When the transmit channel knowledge is available at the relay, we propose the optimum transmission strategies at the multi-antenna relay from the information-theoretic perspective for the two data combining schemes. Furthermore, we propose the methods to find the optimum time-division (TD) strategies between the multiple access (MAC) phase and the broadcast (BRC) phase in two-way DF relaying systems, considering both peak and average power constraints. Next, we consider the design of practical transmission schemes in MIMO two-way relaying systems. We propose a novel channel estimation method for the BRC phase of MIMO two-way DF relaying systems when the SPC scheme is applied. The self-interference (SI), which contains the known data at the receivers in two-way relaying systems, is utilized to estimate the channel. Since the SI is inherent in the received signals in two-way relaying systems, it does not consume additional system resources as pilots do. On the other hand, the SI can also be used together with pilots to offer superior channel estimation performances than the purely pilot-aided channel estimation scheme. Furthermore, we quantify the spectral efficiency improvement of the BRC phase channel with SI-aided channel estimation by deriving its achievable rates using different codebooks. Finally, we propose a novel method to exploit the bit-level SI so that asymmetric data rates can be transmitted in the BRC phase of two-way DF relaying systems when the network coding scheme is applied. Since the network coding scheme combines the data on the bit level, the major problem faced by the network coding scheme is how to transmit with asymmetric data rates to the user stations according to their individual link qualities in the BRC phase. In the proposed scheme, the weaker link receiver exploits the a priori bit information in each received data symbol, so that it only needs to decode on a subset of the signal constellation. Subject to the same bit error rate constraint, the weaker link receiver can decode at lower signal-to-noise ratio (SNR) compared to the stronger link. ii

4 Kurzfassung In den vergangenen Jahrzehnten hat sich die drahtlose Kommunikation in eine der am schnellsten wachsenden Sektoren der Nachrichtentechnik-Industrie gewandelt. Um die enorm gestiegene Nachfrage decken zu können, setzen Wireless Service Provider darauf, zukünftige drahtlose Kommunikationssysteme so zu verbessern, dass wesentlich höhere Datenraten unterstützt werden. Eine der wichtigsten Innovationen der letzten Jahre zur Unterstützung hoher Datenraten in der drahtlosen Kommunikation ist die Einführung der Multiple-Input Multiple-Output (MIMO)-Technologie, die durch die Verwendung von Merfach-Antennen-Arrays auf Seiten von Sender und Empfänger möglich wird. Die Verwendung von mehreren Antennen bietet für Wireless-Systeme eine signifikante Erhöhung der Zuverlässigkeit und der Übertragungsrate. Mittlerweile gilt die Verwendung von MIMO- Techniken allgemein als Schlüssel zur Bereitstellung hoher Übertragungsraten in drahtlosen Systemen und findet Eingang in die aktuellen Standards der drahtlosen Kommunikation. Auf der anderen Seite wirft dies aber auch die Frage auf, ob konventionelle drahtlose Kommunikations-Architekturen in der Lage sind, die für die künftige Generation drahtloser Kommunikationssysteme notwendigen hohen Datenraten allen Nutzer zur Verfügung zu stellen. Ist es z.b. im Fall von LTE Advanced, der vierten Generation (4G) zellularer Mobilfunknetze, möglich, auch Usern am Zellrand mit der gebotenen Zuverlässigkeit die erstrebten hohen Übertragungsraten zu liefern? Relay-Kommunikation wird als ein Mittel zur Erweiterung der Reichweite in drahtlosen Netzen vorgeschlagen, mit dem Vorteil geringerer Kosten für die Bereitstellung der Infrastruktur im Vergleich zu anderen Optionen, wie z.b. einer Erhöhung der Dichte von Basisstationen. Allerdings erfordern konventionelle Halb-duplex Relaying Protokolle zwei Kanalzugriffe, um die Daten von der Quelle über das Relay bis zum Bestimmungsort weiterzuleiten. Dies schlägt sich in einer reduzierten spektralen Effizienz nieder. Das Two-Way (Zwei-Wege) Relaying Protokoll wurde vorgeschlagen, um diese Verluste signifikant zu minimieren. Two-Way Relaying Protokolle kombinieren die Übermittlung zweier bidirektionaler Informationsflüsse in Relay-Netzen und können in vielen Fällen vergleichsweise problemlos in praktischen Systemen implementiert werden. Diese Dissertation befasst sich mit der Analyse und dem Entwurf von Kommunikationiii

5 Kurzfassung stechniken für MIMO-Relaying-Systeme, wobei insbesondere Two-Way Relaying betrachtet wird. Die Analyse der Relay-Systeme basiert auf Informationstheoretischen Metriken wie etwa der Kanalkapazität und den erreichbaren Datenraten. Wir schlagen geeignete Übertragungsstrategien vor und bewerten die Leistungsfähigkeit dieser Strategien anhand zweckmässiger Kenngrössen. Zunächst zeigen wir dass Relay-Kommunikation zur Erhöhung der Reichweite drahtloser Netzwerke eingesetzt werden kann und schlagen einen quantitativen Analyseansatz vor, um die Verbesserung der Reichweite in zellularen Funksystemen mittels sog. Decode-and- Forward (DF) Relays zu bestimmen. Die Reichweite zellularer Netzwerke definieren wir hierbei anhand der erzielbaren Übertragungsrate und präsentieren analytische Berechnungen sowie Simulationsergebnisse, welche die Reichweitenverbesserung der betrachteten Systeme durch Relaying belegen. Darüber hinaus schlagen wir einen Informationstheoretischen Ansatz zur Performanceanalyse von MIMO Two-Way Relaying Systemen vor. Für diese Systeme werden unter Einsatz von DF-Relaying zwei Verfahren detailliert untersucht, die sich darin unterscheiden, wie die beiden bidirektionalen Informationsflüsse kombiniert werden: das sog. Superposition Coding (SPC) Verfahren, sowie das Network Coding Verfahren. Für den Fall, dass der sendeseitige Kanalzustand am Relay bekannt ist, entwickeln wir die optimale Übertragungsstrategie für Mehrfach-Antennen-Relays durch die Informationstheoretische Betrachtung der beiden Verfahren. Weiterhin schlagen wir für diese Verfahren Methoden vor, um die optimale zeitliche Aufteilung zwischen der Multiple Access (MAC) Phase und der Broadcast (BRC) Phase in Two-Way-DF-Relaying-Systemen zu finden. Dabei werden systembedingte Anforderungen hinsichtlich einer Beschränkung von Spitzen- und Durchschnittsleistungen berücksichtigt. Als nächstes betrachten wir das Design von geeigneten Übertragungsverfahren für MIMO Two-Way Relaying Systeme. Wir schlagen eine neue Methode zur Kanalschätzung vor, die für die BRC Phase von MIMO Two-Way DF Relaying Systemen mit SPC angewendet werden kann. Die Selbst-Interferenz (SI), die durch das Two-Way-Relaying Prinzip in solchen Systemen entsteht, und die aus den über den Kanal zurückgesendeten und damit den Empfängern bekannten Daten besteht, wird genutzt, um den Kanal zu schätzen. Da bei Two-Way Relaying Systemen die SI inhärent in dem Empfangssignal vorhanden ist, werden keine zusätzlichen Systemressourcen wie Pilotsignale benötigt. Andererseits kann die SI auch zusammen mit Pilotsignalen genutzt werden, um eine verbesserte Kanalschätzung im Vergleich zur rein Piloten-gestützte Kanalschätzung zu bieten. Darüber hinaus quantifizieren wir die Verbesserung der spektralen Effizienz der BRC-Phase mit SI unterstützter iv

6 Kanalschätzung durch die Berechnung der erreichbaren Raten mit unterschiedlichen Codebüchern. Schließlich schlagen wir eine neuartige Methode vor, die für ein Network-Coding basiertes Two-Way-Relaying auf Bit-Ebene die SI nutzt, um asymmetrische Datenraten in der BRC Phase von Two-Way Relaying Systemen übertragen zu können. Da das Network- Coding Schema die Daten auf der Bit-Ebene verarbeitet, ist das hauptsächliche Problem dieses Schemas, wie asymmetrische Datenraten in der BRC Phase zu den Nutzerstationen entsprechend der individuellen Verbindungsqualität übertragen werden können. In dem vorgeschlagenen Schema nutzt die schwächere Verbindung die a priori Bitinformation in jedem empfangenen Datensymbol, so dass nur eine Teilmenge der Signalkonstellation dekodiert werden muss. Unter der gleichen Bitfehlerratenbedingung kann der Empfänger der schwächeren Verbindung so bei einem geringeren Signal-zu-Rausch-Verhältnis (SNR) dekodieren im Vergleich zu dem SNR der stärkeren Verbindung. v

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