Wideband reference signal transmission in sc-fdma communication systems
AssigneeIntel Corporation
InventorAris Papasakellariou
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Abstract
Embodiments of the invention provide methods for transmitting reference signals (RS) from user equipments (UEs) in wireless communication systems. These RS are used, among other functions, by a serving base station to schedule data transmission from UEs and perform power and timing control of the UE signal transmissions. The RS are constructed based on constant amplitude zero autocorrelation (CAZAC) sequences, including their possible modifications. The invention describes methods to multiplex transmission of RS from multiple UEs by having the serving base station control the CAZAC sequence and the associated cyclic shift, transmission bandwidth, transmission period, and transmission power applied to the RS transmission by each UE.
Claims26
1-14. (canceled)
In a communication system wherein user equipments communicate with a serving base station, a method for at least one user equipment of said user equipments to transmit reference signals, said method comprising the steps of:
- said serving base station informing said at least one user equipment of a transmission spectral comb in a transmission bandwidth;
- and
- said at least one user equipment periodically transmitting a reference signal having said transmission spectral comb in said transmission bandwidth.
In a communication system wherein user equipments communicate with a serving base station, a method for at least one user equipment of said user equipments to transmit reference signals, said method comprising the steps of:
- said serving base station informing said at least one user equipment of a transmission bandwidth;
- said at least one user equipment periodically transmitting a reference signal in said transmission bandwidth, said reference signal having a comb spectrum;
- and
- said comb spectrum varies during successive transmissions of said periodically transmitted reference signal according to a predetermined pattern.
23-31. (canceled)
In a communication system wherein user equipments communicate with a serving base station, a method for at least one user equipment of said user equipments to a transmit reference signal, said method comprising the steps of:
- said serving base station informing said at least one user equipment of a cyclic shift;
- said at least one user equipment constructing a reference signal by applying said cyclic shift to a sequence;
- and
- said at least one user equipment periodically transmitting said reference signal.
In a communication system wherein user equipments communicate with a serving base station, a method for at least one user equipment of said user equipments to transmit a reference signal, said method comprising the steps of:
- said serving base station informing said at least one user equipment of a transmission power level;
- and
- said at least one user equipment periodically transmitting a reference signal having reference signal transmission power determined from said transmission power level.
A method, comprising the steps of:
- transmitting to at least one user equipment a transmission spectral comb in a transmission bandwidth;
- and
- receiving periodically from said at least one user equipment a reference signal having said transmission spectral comb in said transmission bandwidth.
A method, comprising the steps of:
- receiving a transmission bandwidth;
- and
- periodically transmitting a reference signal in said transmission bandwidth, said reference signal having a comb spectrum, said comb spectrum varying during successive transmissions of said periodically transmitted reference signal according to a predetermined pattern.
A method, comprising the steps of:
- receiving a cyclic shift in a communications signal;
- constructing a reference signal by applying said cyclic shift to a sequence;
- and
- periodically transmitting said reference signal.
Dependencies are inferred from the claim text.