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Array antenna arrangementArray antenna arrangement description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090010356, Array antenna arrangement. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD
The present invention relates to a wireless communication system comprising at least one base station in a communication cell, the base station being equipped with at least one array antenna comprising at least two antenna ports, where the at least two ports are connected to respective at least two corresponding antenna elements, where at least two of the at least two antenna elements, have essentially the same polarization. According to a certain aspect of the invention, in a first mode of operation, the array antenna is arranged for communication via one antenna radiation lobe, communicating one information stream to at least one UE (user equipment) in the cell. The present invention also relates to a method for communication of at least one information stream from a base station array antenna in a communication cell, the base station array antenna comprising at least two antenna ports, where the at least two ports are connected to respective at least two corresponding antenna elements, where at least two of the at least two antenna elements have essentially the same polarization. According to a certain aspect of the invention, in a first mode of operation, the method comprises the step: communicating one information stream, to at least one UE (user equipment) in the cell, via one antenna radiation lobe. BACKGROUND ARTThe demand for wireless communication systems has grown steadily, and is still growing, and a number of technological advancement steps have been taken during this growth. In order to acquire increased system capacity and user data bit rate for wireless systems by employing de-correlated propagation paths, MIMO (Multiple Input Multiple Output) systems have been considered to constitute a preferred technology for improving the capacity and the user data bit rate. MIMO employs a number of separate independent signal paths, for example by means of several transmitting and receiving antennas. Generally, a MIMO system utilizes de-correlated, or at least essentially de-correlated, transmitted signals. The meaning of the term “de-correlated signals” in this context is that the radiation patterns are essentially de-correlated. This is today made possible by means of spatial separation, i.e. having at least two antennas separated by 5-10 wavelengths, (calculated from the centre frequency of the frequency band for which the antennas are designed), normally in azimuth, in order to achieve low correlation between the signals at the antenna ports. These at least two antennas have at least one antenna radiation lobe each. It is also possible to combine spatial separation with polarization separation, where the antennas then also are arranged for transmission and reception of signals having orthogonal polarizations. A base station in a MIMO system may thus be arranged with a number of antennas, separated by 5-10 wavelengths, each one of the base station antennas either being designed for one polarization or a plurality of essentially de-correlated polarizations, typically two essentially de-correlated polarizations. These antennas produce antenna radiation lobes which are de-correlated, either by space or polarization, or both. It is necessary that a user equipment (for example a mobile phone or a portable computer) is arranged with at least two antenna ports for communication in a MIMO system. A problem with existing MIMO arrangements is that, since an original information stream is divided into two or more separate information streams, the SNR (Signal to Noise Ratio) is deteriorated given a fixed output power. A decreased SNR results in that the rate of transferred data, the data bit rate, is decreased. Furthermore, the signal path between the base station and the user equipment may be blocked by a number of objects such as large buildings in an urban environment, which objects cause a number of reflections. These reflections may result in that the signal to noise ratio (SNR) becomes even more deteriorated, and thus the signals transmitted between the base station and the user equipment may become more and more noisy the more buildings that are in the way. It may thus be possible to use MIMO only in the vicinity of a base station. A good MIMO performance requires good SNR. The traditional MIMO systems, having one information stream per antenna, are thus afflicted with a disadvantage concerning the data bit rate between the base station and the user equipment, both in urban environments and in the countryside, due to the fact that the base station antenna radiation lobes are spatially separated in order to obtain essentially de-correlated signals. This means that the MIMO system is not used optimally, for a given surface area and output power. DISCLOSURE OF THE INVENTIONThe objective problem that is solved by the present invention is to provide an arrangement suitable for a MIMO system, which arrangement is capable of providing an enhanced communication between a base station, having at least two antenna ports, and a user equipment, having at least two antenna ports for communication via the at least two base station antenna radiation lobes. The objective problem is solved by means of a wireless communication system according to the introduction, where the array antenna is arranged for communication via at least two antenna radiation lobes, each antenna radiation lobe communicating an information stream to the at least one UE (user equipment) in the cell, thus communicating by means of MIMO (Multiple Input Multiple Output). According to a certain aspect of the invention, this corresponds to a second mode of operation. The objective problem is also solved by means of an array antenna arranged for use in the communication system. Furthermore, the objective problem is also solved by means of a method according to the introduction, where the method further comprises the step: communicating at least two information streams, to the at least one UE (user equipment) in the cell, via at least two antenna radiation lobes. According to a certain aspect of the invention, this corresponds to a second mode of operation. That means that the decrease of SNR due to the dividing of an original information stream into two or more separate information streams is more or less recovered by use of array gain, where furthermore a relatively small amount of information regarding the channel is required. Preferred embodiments are disclosed in the dependent claims. Continue reading about Array antenna arrangement... Full patent description for Array antenna arrangement Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Array antenna arrangement patent application. 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