Software Radio: Technologies and Services by M. Gerla, P. Johansson, R. Kapoor, F. Vatalaro (auth.),

By M. Gerla, P. Johansson, R. Kapoor, F. Vatalaro (auth.), Enrico Del Re (eds.)

Next-generation cellular communications tend to hire diversified innovations and criteria. The implementation in software program of as many receiver functionalities as attainable seems to be the simplest answer for dealing with the multiplicity of communications choices. the concept that of software program radio, relationship again to 1991, initially attracted advertisement curiosity because of the prospect that transmission layer capabilities may be absolutely software-defined. an identical strategy may be prolonged to protocols of the better layers too, therefore conceiving a programmable to enforce the functionalities of a number of layers of protocols through resident software program or software program downloaded from the community. together with chosen technical contributions to the Workshop on "Software Radio", this quantity offers with state of the art surveys of the permitting applied sciences and the potential prone of software program radio implementations for destiny cellular communications.
Original and state of the art study and improvement is gifted in fields such as:
- software program radio for common instant net access
- software program radio for multimedia communications
- software program radio architecture
- community structure, protocols and providers
- software program radio expertise in the direction of pervasive appliance.
This quantity on software program radio is a necessary reference for either researchers and telecommunications professionals.

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With the current specification, up to seven slave devices can be set to communicate with a master radio in one device, establishing a so-called piconet. Several of these piconets can be linked together in ad-hoc scatternets to allow communication in flexible configurations. Furthermore, the use of unlicensed ISM band has a good impact on the cost ofBT systems. All these aspects make BT suitable for the realisation of an ad-hoc wireless LAN, especially for short-range indoor environments. In our experiments, we have tested the behaviour of a typical TCP/IP application, such as an FTP session, through a BT wireless connection.

Table 2. Environments description Envl 2mt distance between terminals on different desks Env2 3mt distance on different desktops and microwave oven 4m away beneath a wall Env3 4mt distance, wall in the middle with metal whiteboards on both sides Env4 8mt distance on the same laboratory, with manv obstacles between BT devices EnvS 3mt distance on different desktops with microwave oven between them Many tests have been carried out in every environment, using different BT packet types. More precisely, we have only changed the packet formats in forward direction (from master to slave), whereas in reverse direction we have always used single slot unprotected packets (DHI), because they appear ideal to carry the low' 34 traffic in this direction (mainly due to TCP acknowledgement).

2. 1 Introduction There is an increasing interest in architectural integration between Software Defined Radio (SDR) base stations and the adaptive processing needed for smart antennas. With wireless data service becoming a major component in the telecommunications world, the users are demanding anytime, anywhere access to a wide spectrum of information by handheld mobile devices. This requires a ubiquitous high capacity wireless network and provides strong motivation for considering smart antenna applications in the base station (and possibly in the mobile terminals).

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