MIMO Hybrid-ARQ Utilizing Lower Rate Retransmission over Mobile WiMAX System

Chen, Cheng-Ming; Hsu, Jen-Yuan; Kuo, Ping-Heng; Ting, Pangan

doi:10.1109/mws.2009.8

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…To achieve reliable transmission over fading channels, automatic repeat request (ARQ) protocols can be employed at the medium access control layer [16]. ARQ protocols for MIMO systems were considered in the literature, see, for example, [17][18][19][20]. Moreover, to have an insight into the energy efficiency in ARQ systems, some research works investigated the trade-off between the energy efficiency and delay, that is, the energy-delay trade-off (EDT) [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis of antenna selection multi‐input multi‐output automatic repeat request systems over Nakagami‐mfading channels

Tran

Safaei

et al. 2015

IET Communications

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Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis of antenna selection multi‐input multi‐output automatic repeat request systems over Nakagami‐mfading channels

Tran

Safaei

et al. 2015

IET Communications

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“…To reduce buffer size and power consumption, a lower rate MIMO mode in retransmission request, termed as Lower Rate Retransmission (LRR) Scheme [Chen et. al, 2009], is proposed.…”

Section: Introductionmentioning

confidence: 99%

Advanced Transmission Techniques in WiMAX

Hincapié¹,

Sierra²

2012

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Electronic devices such as mobile phones and laptop computers are parts of modern life. Users of portable wireless devices always desire such devices to be of small volume, light weight, and low cost. Thanks to the rapid advances in very large scale integration (VLSI) technology, this dream has become a reality in the past two decades. As technology grows rapidly, a mobile is not just a phone recently. The highly integration of circuits makes the mobile phone and the PDA (personal digital assistant) been combined into a single handset, which is called a smart phone. Also, the Internet carries various information resources and services, such as electronic mail, online chat, file transfer and file sharing, these attractive proprieties make wireless internet service becomes an important function that should be integrated into mobile devices. There are many ways for the user to connect to the internet. The traditional wireless local area network (WLAN) is a popular communication system for accessing the Internet. However, the reach of WiFi is very limited. WLAN connectivity is primarily constrained to hotspots, users need to find the access points and can only use it in certain rooms or areas. As the user get out of range of the hotspot, the signal will become very weak and the user may lose the connection. This disadvantage limits the mobility of wireless communication. Except for the widely used wireless local area network, third generation (3G) mobile telephony based on the High Speed Downlink Packet Access (HSDPA), which is part of the UMTS standards in 3G communications protocol, is another high speed wireless internet access service. It has become popular nowadays that people can get to the internet via cellular communication system. This technology gives the users the ability to access to the Internet wherever the signal is available from the cellular base station. However, the quality sometimes depends on the number of users simultaneously connected per cellular site. In addition to utilizing WLAN/3G dual-mode terminals to enhance efficiency of mobile number portability service, WiMAX (the Worldwide Interoperability for Microwave Access) is an emerging telecommunications technology that provides wireless data transmission in a variety of ways, ranging from point-to-point links to full mobile cellular-type access. WiMAX is similar to Wi-Fi but it can also permit usage at much greater distances. The bandwidth and range of WiMAX make it suitable for the applications like VoIP (Voice over Internet Protocol) or IPTV (Internet Protocol Television). Many people expect WiMAX to emerge as another technology that may be adopted for handset devices in the near future.

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“…However, little research has been devoted on the decoding complexity issue in MIMO HARQ systems (e.g., [31]- [33]). In [31], a suboptimal hard decision decoding algorithm is utilized in MIMO HARQ systems to reduce the decoding complexity at the cost of sacrificing the Bit Error Rate (BER) performance.…”

mentioning

confidence: 99%

“…Thus, the scheme in [32] would not be a desirable protocol for limited memory receivers. It is investigated in [33] that a low rate Alamouti-based HARQ protocol has the computational complexity advantage to other conventional HARQ protocols in the decoding process.…”

mentioning

confidence: 99%

Fast-Decodable MIMO HARQ Systems

Hosseini

Abouei

Uysal

2015

IEEE Trans. Wireless Commun.

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This paper presents a comprehensive study on the problem of decoding complexity in a Multi-Input MultiOutput (MIMO) Hybrid Automatic Repeat reQuest (HARQ) system based on Space-Time Block Codes (STBCs). We show that there exist two classes of fast-decodable MIMO HARQ systems: independent and dependent STBC structures. For the independent class, two types of protocols namely, fixed and adaptive threshold-based are presented and their effectiveness in both computational complexity reduction and spectral efficiency preservation are discussed. For the dependent class, a fast Sphere Decoder (SD) algorithm with a low computational complexity is proposed for decoding process of HARQ rounds. Two new concepts are introduced to leverage the fast-decodable notion in MIMO HARQ systems. Simulation results show that the proposed fast-decodable MIMO HARQ protocols in both classes provide a significant reduction in the decoding complexity as compared with the original MIMO HARQ method.

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MIMO Hybrid-ARQ Utilizing Lower Rate Retransmission over Mobile WiMAX System

Cited by 5 publications

References 9 publications

Energy efficiency analysis of antenna selection multi‐input multi‐output automatic repeat request systems over Nakagami‐mfading channels

Energy efficiency analysis of antenna selection multi‐input multi‐output automatic repeat request systems over Nakagami‐mfading channels

Advanced Transmission Techniques in WiMAX

Fast-Decodable MIMO HARQ Systems

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