文档介绍：662 IEEE JOURNAL ON SELECTED AREAS MUNICATIONS, VOL. 17, NO. 4, APRIL 1999
Software Radio Architecture with Smart Antennas:
A Tutorial on Algorithms plexity
Javad Razavilar, Member, IEEE, Farrokh Rashid-Farrokhi, Member, IEEE, and K. J. Ray Liu, Senior Member, IEEE
Abstract— Recently, there has been considerable interest in grammed for emerging standards. It also can be dynamically
using antenna arrays in works to updated with new software without any changes in hardware
increase the capacity and decrease the cochannel interference. and infrastructure. Rapid deployment is another important
Adaptive beamforming with smart antennas at the receiver in-
creases the carrier-to-interference ratio (CIR) in a wireless link. feature of the software radio. In wireless applications where
This paper considers a work with beamforming capa- different standards might be deployed, users’ roaming can be
bilities at the receiver which allows two or more transmitters to a big issue in existing platforms. In the software radio system,
share the same channel municate with the base station. The users just need to download the new air interface upon entering
plexity and algorithm structure of a the new territory.
base station are considered in terms of a software radio system
model, initially with an omnidirectional antenna. The software The reallocation of bandwidth is a standards-setting process
putational model is then expanded to characterize a that takes a considerably long time. On the other hand, due to
network with smart antennas. The application of the software fixed finite resources, one cannot assume that more physical
radio smart antenna is demonstrated through two examples. radio channels will be added to a spectrum allocation to reduce
First, traffic improvement in work with a smart antenna the probability of blocking or forced termination [9]–[13]. The
is considered, and the implementation of a hand-off algorithm in
the software radio is presented. The