Method and apparatus to generate virtual sector wide static beams using phase shift transmit diversity
a technology of phase shift and transmit diversity, applied in the direction of polarised antenna unit combination, wireless communication, wireless commuication services, etc., can solve the problems of unable to provide sector wide coverage for one logical antenna, two physical antennas cannot provide sector wide coverage for one physical antenna, and existing techniques produce combined over-the-air signals that fail to fully utilize the full bs power
Inactive Publication Date: 2015-08-27
ALCATEL LUCENT SAS
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AI Technical Summary
Benefits of technology
This approach ensures sector-wide coverage without calibration, fully utilizing base station power and simplifying implementation, while maintaining equivalent coverage to a single physical antenna, even with a small number of physical antennas.
Problems solved by technology
Achieving this coverage is often hard especially if the number of physical antennas that make up a logical antenna is small.
For example, currently two physical antennas can not provide sector wide coverage for one logical antenna according to existing techniques.
Furthermore, if sufficient physical antennas are used to obtain sector-wide coverage, existing techniques produce a combined over-the-air signal that fails to fully utilize the full BS power.
However, in general such combining often suffers from some problems.
This calibration capability adds cost, operational complexity and an additional part that can fail.
As another example problem, the gains that need to be employed often do not permit utilization of full transmission power of each path.
The disadvantage is that the BS power is significantly under-utilized and wasted for these common channels.
Method used
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[0026]Various example embodiments will now be described more fully with reference to the accompanying drawings in which some example embodiments are shown.
[0027]While example embodiments are capable of various modifications and alternative forms, the embodiments are shown by way of example in the drawings and will be described herein in detail. It should be understood, however, that there is no intent to limit example embodiments to the particular forms disclosed. On the contrary, example embodiments are to cover all modifications, equivalents, and alternatives falling within the scope of this disclosure. Like numbers refer to like elements throughout the description of the figures.
[0028]Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second eleme...
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In one embodiment, the method includes receiving a signal, and generating first and second transmission signals from the received signal. The first signal has a fixed phase, and the second signal has a phase that changes over time. The first and second signals are sent from first and second antennas, respectively.
Description
BACKGROUND OF THE INVENTION[0001]In modern wireless systems (e.g., LTE, WIMAX, HSPA, UMTS, CDMA, etc) base station (BS) antennas are defined both physically and logically (in LTE they are referred to as antenna ports). Logical antennas are mapped to and implemented via physical antennas (e.g., typically several physical antennas are mapped to one logical antenna). Physical antennas are generally transparent and not visible to mobile stations (MSs), while logical antennas are generally distinguishable to MSs.[0002]When these physical antennas are combined to yield one logical antenna, identical signals corresponding to the logical antenna are transmitted over multiple physical antennas after they are pre-processed through pre-coding matrices. These signals thus transmitted combine over the air to yield one signal transmitted over a logical antenna.[0003]Some of these signals (such as common channels including broadcast channels) need to achieve proper sector-wide (or cell-wide as it ...
Claims
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IPC IPC(8): H04B7/06
CPCH04B7/0617H01Q3/30H01Q3/40H01Q21/26H04B7/0682
Inventor RUDRAPATNA, ASHOK N.
Owner ALCATEL LUCENT SAS