Compensation for propagation delay in a wireless communication system
First Claim
1. A method of compensating for propagation delay in a wireless communication system, wherein a processing unit in a base station or in a NodeB is in communication with a first plurality of antenna units being in wireless communication with at least a first terminal, the first terminal having a terminal antenna, the method comprising:
- determining relative propagation delay associated with a wireless channel from each of the first plurality of antenna units to the terminal antenna of said first terminal, the first plurality of antenna units being part of a distributed antenna system such that the first plurality of antenna units are spatially separated from each other and from the base station or the NodeB;
establishing a delay profile specific for the first terminal using the determined relative propagation delays; and
compensating for the determined relative propagation delay from each of the first plurality of antenna unit to said first terminal by applying the delay profile to a transmission between the processing unit and said first terminal,wherein the relative propagation delay between each of the first plurality of antenna units and said first terminal or between each of the first plurality of antenna units and each of a second plurality of terminals are determined in the frequency domain, wherein the method further comprises;
evaluating phase differences between propagation channels between said first terminal and the first plurality of antenna units, or between a terminal in the second plurality of terminals and the first plurality of antenna units, for two different frequencies;
estimating propagation time differences from the slope of one line being fitted to the evaluated phase differences over frequency.
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Abstract
In a first aspect the present invention relates to a method of compensating for propagation delay in a wireless communication system. A first base station is in communication with a first plurality of antenna units which are adapted to be in wireless communication with a first terminal. The first terminal having a terminal antenna. The first plurality of antenna units is spatially separated. The method according to the first aspect comprises the steps of determining relative propagation delay from each of the first plurality of antenna units to the terminal antenna and using the determined propagation delay to establish a delay profile to compensate for propagation delay from each of the antenna units to the first terminal and applying the delay profile to a transmission between the base station and the terminal. In a second aspect the present invention further relates to a system implementing the method according to the first aspect.
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Citations
25 Claims
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1. A method of compensating for propagation delay in a wireless communication system, wherein a processing unit in a base station or in a NodeB is in communication with a first plurality of antenna units being in wireless communication with at least a first terminal, the first terminal having a terminal antenna, the method comprising:
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determining relative propagation delay associated with a wireless channel from each of the first plurality of antenna units to the terminal antenna of said first terminal, the first plurality of antenna units being part of a distributed antenna system such that the first plurality of antenna units are spatially separated from each other and from the base station or the NodeB; establishing a delay profile specific for the first terminal using the determined relative propagation delays; and compensating for the determined relative propagation delay from each of the first plurality of antenna unit to said first terminal by applying the delay profile to a transmission between the processing unit and said first terminal, wherein the relative propagation delay between each of the first plurality of antenna units and said first terminal or between each of the first plurality of antenna units and each of a second plurality of terminals are determined in the frequency domain, wherein the method further comprises; evaluating phase differences between propagation channels between said first terminal and the first plurality of antenna units, or between a terminal in the second plurality of terminals and the first plurality of antenna units, for two different frequencies; estimating propagation time differences from the slope of one line being fitted to the evaluated phase differences over frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus in a base station or a NodeB configured to connect to a communication link for establishing communication to a first plurality of antenna units that each wirelessly communicate with at least a first terminal, the first terminal having a terminal antenna, the apparatus comprising a controller unit and a storage unit, the storage unit storing computer software that when executed by the controller unit controls the apparatus to compensate for propagation delay in a wireless communication system based on configuring the apparatus to:
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determine a relative propagation delay associated with a wireless channel from each of the first plurality of antenna units to the terminal antenna of said first terminal, the first plurality of antenna units being part of a distributed antenna system such that the first plurality of antenna units are spatially separated from each other and from the base station or the NodeB; establish a delay profile specific for the first terminal using the determined relative propagation delay; and compensate for the determined relative propagation delay from each of the first plurality of antenna units to said first terminal by applying the delay profile to a transmission between the processing unit and said first terminal, wherein the relative propagation delay between each of the first plurality of antenna units and said first terminal or between each of the first plurality of antenna units and each of a second plurality of terminals are determined in the frequency domain, and wherein the storage unit stores computer software that when executed by the controller unit further controls the apparatus to; evaluate phase differences between propagation channels between said first terminal and first plurality of antenna units, or between a terminal in the second plurality of terminals and first plurality of antenna units, for two different frequencies; and estimate propagation time differences from the slope of one line being fitted to the evaluated phase differences over frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification