Radio frequency spectrum is a scarce and critical natural resource that is utilized for many services including surveillance, navigation, communication, and broadcast- ing. Recent years have seen tremendous growth in the use of spectrum especially by commercial cellular operators. Ubiquitous use of smartphones and tablets is one of the reasons behind an All-time high utilization of spectrum. As a result, cellular operators are experiencing a shortage of radio spectrum to meet bandwidth demands of users. On the other hand, spectrum measurements have shown that much spectrum not held by cellular operators is underutilized even in dense urban areas. This has motivated shared access to spectrum by secondary systems with no or minimal impact on incumbent systems. Spectrum sharing is a promising approach to solve the problem of spectrum congestion as it allows cellular operators access to more spectrum in order to satisfy the ever-growing bandwidth demands of commercial users.
标签： Spectrum Sharing Between Radars
上传时间： 2020-06-01
上传用户：shancjb
it is impotant to somepeople,all in good time,if you see it,must love it !thank you i f you see it,must love it !thank you
标签： you it somepeople see
上传时间： 2014-01-16
上传用户：xfbs821
It s time for web servers to handle ten thousand clients simultaneously, don t you think? After all, the web is a big place now
标签： simultaneously thousand clients servers
上传时间： 2013-12-30
上传用户：wlcaption
This cookbook contains a wealth of solutions to problems that SQL programmers face all the time. Recipes inside range from how to perform simple tasks, like importing external data, to ways of handling issues that are more complicated, like set algebra. Each recipe includes a discussion that explains the logic and concepts underlying the solution. The book covers audit logging, hierarchies, importing data, sets, statistics, temporal data, and data structures.
标签： programmers solutions cookbook contains
上传时间： 2013-12-08
上传用户：Altman
we present real-time particle filters, which make use of all sensor information even when the filter update rate is below the update rate of the sensors.
标签： information real-time particle present
上传时间： 2016-05-08
上传用户：顶得柱
Its functions are: n order within (excluding n) At the same time, 3 and 7 can be integral to all natural and a few of the square root of s, and function as a value to return, the final result s output to file out.dat China.
标签： functions excluding integral within
上传时间： 2016-11-12
上传用户：王者A
it is an management of a medical store which takes less time than maintaining all records manually
标签： maintaining management manually medical
上传时间： 2014-01-23
上传用户：dsgkjgkjg
Although there has been a lot of AVL tree libraries available now, nearly all of them are meant to work in the random access memory(RAM). Some of them do provide some mechanism for dumping the whole tree into a file and loading it back to the memory in order to make data in that tree persistent. It serves well when there s just small amount of data. When the tree is somewhat bigger, the dumping/loading process could take a lengthy time and makes your mission-critical program less efficient. How about an AVL tree that can directly use the disk for data storage ? If there s something like that, we won t need to read through the whole tree in order to pick up just a little bit imformation(a node), but read only the sectors that are neccssary for locating a certain node and the sectors in which that node lies. This is my initial motivation for writing a storage-media independent AVL Tree. However, as you step forth, you would find that it not only works fine with disks but also fine with memorys, too.
标签： available libraries Although nearly
上传时间： 2014-01-22
上传用户：zhoujunzhen
* DEFINITION * This a set of math functions that deal with time. The functions accept * 4-digit time values and 4-digit time of day values. Time values are * interpreted as hours-minutes and are valid if all digits are numeric and * 9 or less, except the second-to-last digit must be 5 or less. Time of day * values are valid if they conform to normally accepted clock values of * 1:00 to 12:59 for a 12-hour clock or 00:00 to 23:59 for a 24-hour clock.
标签： functions DEFINITION accept digit
上传时间： 2014-01-15
上传用户：Divine
RTX-51 is a runtime library that, together with C51, allows real-time systems to be implemented for all processors of the 8051 family (e.g., 8051, 8052, 80515, etc.), except for the 8?C751 and 8?C752. RTX-251 extends the functionality of the RTX-51 to the new intel MCSÒ 251 family of processors. It is available as a set of runtime libraries supporting the binary and the source mode to be used with the C251.
标签： implemented real-time together runtime
上传时间： 2013-12-13
上传用户：refent
