On the role of future high-frequency BFWA systems in broadband communication networks

Tardy, Isabelle; Grøndalen, Ole

doi:10.1109/mcom.2005.1391514

Cited by 8 publications

(9 citation statements)

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“…The development of BFWA infrastructures will form part of an integrated communication environment of the future. Today, last mile access is often based on cable technologies and asymmetric digital subscriber lines (ADSL), but for some areas and some users wireless access represents a better and cheaper alternative [7,8]. BFWA will reach users outside geographical and/or financial scope of ADSL or cable modem and can moreover offer higher capacity [8].…”

Section: Introductionmentioning

confidence: 99%

“…Today, last mile access is often based on cable technologies and asymmetric digital subscriber lines (ADSL), but for some areas and some users wireless access represents a better and cheaper alternative [7,8]. BFWA will reach users outside geographical and/or financial scope of ADSL or cable modem and can moreover offer higher capacity [8]. The first standard for BFWA was North-American MMDS, acronym staying for Multichannel Multipoint Distribution Service [9], working in the 2.6 GHz band.…”

Section: Introductionmentioning

confidence: 99%

“…LMDS is based on a two-layered network architecture: a first layer working at macrocell level (1-3 Km radius) and operating at high frequency (28/40 GHz [10]), and a second layer working at microcell level (50-500 m radius) and operating in the 5.8 GHz band [10]. LMDS was mainly studied for Internet browsing and video-on-demand services (in fact, it is based on DVB radio interface [8,10]), so the maximum downstream data rate allowed (38 Mb/s) is much higher than upstream one (512 Kb/s) [10]. MMDS and LMDS were developed at the end of '90s, but the commercial deployment of broadband services over such platforms is advancing quite slowly due to some technical uncertainties [11].…”

Section: Introductionmentioning

confidence: 99%

“…16 and HIPERMAN can be regarded as longer-range extensions of WLAN standards like IEEE 802.11x and HIPERLAN [13]. They should guarantee data rates of about 10-15 Mb/s over cells of about 5 Km of radius [8,11]. Such a goal is very ambitious and still to be reached at the present time.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, IEEE and ETSI introduced OFDM for IEEE 802. 16 and HIPERMAN respectively in order to increase average throughput under non-LOS and heavy multipath conditions [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

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A Joint MAC-PHY Approach for Medium Access Control in VBR MC-CDMA Broadband Indoor Connections

Sacchi

Scorza

Granelli

et al. 2006

Wireless Pers Commun

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Multicarrier Code Division Multiple Access (MC-CDMA) techniques were originally proposed at mid of 90's for wideband multi-user communications in wireless environments characterized by hostile propagation characteristics. In this work, 1 the design of a MC-CDMA-based infrastructure is considered for VBR broadband indoor connections with real-time asynchronous multiple access. At the present time, Broadband Fixed Wireless Access (BFWA) standards like IEEE 802.16 and HIPERMAN can bring broadband services inside buildings, but indoor access should be conveniently provided by a local area connection. The capability of MC-CDMA of supporting asynchronous multi-user variable-bit-rate (VBR) transmission is exploited jointly with an efficient and real-time Medium Access Control (MAC) strategy in order to allow a significant number of indoor VBR users to transmit information in CDMA modality with different quality of service (QoS) profiles. Different classes of users are defined at the MAC level. The available radio resources (i.e. the orthogonal subchannels) are selectively attributed to transmitting users depending on their performance achieved at MAC level and measured by an "intelligent" gateway. When the quality level is not satisfactory for one or more users, the AP issues a decrease of the data rate for such users while providing them with an increased number of subcarriers, guaranteeing a slower transmission fostered against frequency-selective channel distortions. The paper presents an overview of the system and tests its performance through extensive simulations. The proposed joint MAC-PHY approach demonstrates good performance in terms of achieved throughput and high flexibility in radio resource management.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In particular, IEEE and ETSI introduced OFDM for IEEE 802. 16 and HIPERMAN respectively in order to increase average throughput under non-LOS and heavy multipath conditions [8,11,12].…”

Section: Introductionmentioning

confidence: 99%

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