WIRELESS Universal serial bus[USB]

By | November 28, 2010

Wireless  USB  is  a  wireless  technology  which  enables  the  high  speed computer  peripheral  interface,  USBs.  It  is  a  wire replacement of existing USB  technology  using  a  Multi Band Orthogonal  Frequency  Division Multiplexing  radio  technique.  Wireless  USB  is  a  logical bus  that supports  data  exchange  between  a  host device(typically a PC )  and a wide range  of  simultaneously  accessible peripherals. The attached peripherals share  bandwidth through a host- scheduled, TDMA-based protocol. The bus allows  peripherals  to be  attached, configured, used, and detached while the host and other peripherals are in operation.  Security definitions are provided to as sure  secure associations between hosts and devices,  and to assure private communication. Wireless USB connects USB devices  with the  USB  host using  a   ‘hub and spoke’  model.  The Wireless USB host is the ‘hub ”  at the center, and each device sits at the end of  a  ‘spoke’.        E ach  ‘ spoke ‘  is  a  point-to-point connection between the host and device. Wireless USB hosts can support up to 127 devices.

INTRODUCTION

Universal serial bus[USB] technology has made it easier to connect peripherals to PCs than prior methods, such as serial and parallel ports. USB lets users attach peripherals and other devices-such as digital cameras, game controllers, hard drives, printers, and scanners-without having to install individual drivers or use expansion cards, all without rebooting the computer. However, USB requires connections via cables, which can become a jumble when many devices are involved. And the cables limit the distance over which users can connect devices. To address this issue, a number of companies-including Alereo, Belkin International, D-Link, Fujits, Gemtek Technology, Hewlett-Packard, Icron Technologies, Intel, Lenovo, LSI Corp., Realtek Semiconductor, Samsung, Staccato Communications, Synopsys, and Wisair- are beginning to release products based on wireless USB (WUSB). “There is significant interest among both computer and consumer- electronic vendors to move from wired to wireless peripheral connections,”

The use of consumer electronics with computers in home-entertainment systems has created a market for WUSB products, which offer easier implementation and communication of multimedia between devices than wired USB provides, Moreover, the technology would let users move around with connected mobile devices beyond the reach of cables.

The initial WUSB products will be dongles and hubs, but vendors will release computers and devices with built-in WUSB capabilities later this year, Huang predicted. Proponents believe large-scale WUSB sales are just over the horizon. As Figure 1 shows, In-Stat estimates there will be 4 billion USB-enabled devices worldwide by 2011, with 503 million, or 12.6 percent, using WUSB. This year, In-Stat predicts, out of 2.5 billion USB devices, only 3 million, or 0.1 percent, will be WUSB-enabled.

Design Considerations

There are several architectural considerations in developing WUSB. In addition to providing wireless connectivity, WUSB must be backwards compatible with wired USB and provide a bridge to wired USB devices. Also, the host and solutions will need to enable the exchange of data between clusters or devices not related to the same host. Low-cost implementation of WUSB will also be important to the successful integration of the technology. Implementation will follow the wired USB connectivity models as closely as possible to reduce development time and to preserve the low-cost, easy-to-use model, which has become pervasive in the PC industry.

FEATURES  OF  UWB:

 Scaleable speeds up over 1 Gbps

 Frequency: 3.1 GHz to 10.6 GHz
 Divided into 14 bands; 5 groups
 Each band is 528 MHz wide
 OFDM symbols are interleaved across all bands
 Provides  protection  against  multi-path/interference
 Frequency: 3.1 GHz to 10.6 GHz (cont.)
 Band Groups 1 & 2: Longer range apps
 Bands Groups 3 & 4: Shorter range apps

USAGE APPLICATIONS

With  the  growing  use  of digital media  in the PC, consumer electronic(CE) and  mobile communication  environments,  a common standard  interconnect  is  needed  to  support  the  on-going convergence  of  these environments.  The  trend  toward convenient wireless distribution of digital information provides  an  opportunity to introduce  a  single, standard  wireless  interconnect  capable  of supporting  usage  models across  all three environments.

The CE  environment  will  have  high-performance  wireless interface expectations. Consumer usage models will  center  on  streaming  media distribution  that  typically  uses compression  algorithms.  The performance  objective  is  to  ensure a  high quality of  service  is maintained  to meet  typical  consumer entertainment expectations. Typical  video  delivery  with standard  SDTV/DVD  will consume between 3 and 7 Mbps while HDTV will use between 19 and 24 Mbps. A point distribution technology  like wireless USB with an effective bandwidth of 480 Mbps could manage multiple  HDTV  streams.  Host buffering  could enable  a network  backbone  to  effectively  distribute content  to  all distribution hosts, enhancing the quality experience for allusers.

Business applications for WUSB include a variety of different usage possibilities.  Common  devices  such  as  printers, scanners, harddrives, and  projectors  could  all  be  used  in wireless scenarios. These devices would function the same way as  if they were using wired USB,  but without all  the  cables. Office  services  on  the  corporate  network  could  migrate to WUSB  and benefit from  faster performance  than  shared network devices  offer.WUSB  also supports  dual-role  devices(DRDs),  which  in addition to  being  a WUSB  device,  can function  as  a  host  with  limited capabilities.  For example,  a digital  camera  could  act as  a device  when connected  to a computer and as a host when transferring pictures directly to a printer.

CONCLUSION

As  discussed  above, Wireless  USB  is  a  technically-superior interface technology  but  its  advantages  are  the  result  of significantly greater complexity when compared to wired USB. Given  today’s  demanding customers  and  competing  interface technologies,  we believe  that manufacturers  can  only  ensure market acceptance  by  delivering  robust Wireless  USB performance in their initial products.

The quality of a Wireless USB implementation will depend on the ability  to successfully balance high  throughput and power. After achieving basic operation with early prototypes, these are key  success  factors which developers will need  to  address  to fine-tune product  performance.  For example,  it  is entirely conceivable  that  a  poor  Wireless  USB implementation  will repeatedly retransmit as  a result of data errors, slowing down its  throughput  and wasting  valuable  battery  power. As concluding part we can say that WUSB since be will designed and has got good support more products need to be improved.

Read more>> wireless USB

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