ADAPTIVE CYCLIC-SHIFT BASED MULTIPLEXING
First Claim
1. A method for wireless communications for a base station, comprising:
- determining a first delay spread for a first antenna port of a channel;
assigning a first pilot signal for the first antenna port to a first cyclic shift of a symbol of a subframe based at least in part on the first delay spread;
determining a second delay spread for a second antenna port of the channel, wherein the first antenna port and the second antenna port are different;
assigning a second pilot signal for the second antenna port to a second cyclic shift of the symbol of the subframe based at least in part on one or both of the first delay spread or the second delay spread;
determining remaining available cyclic shifts for the symbol of the subframe; and
multiplexing data on the remaining available cyclic shifts for the symbol, wherein the data is transmitted by one or both of the first antenna port or the second antenna port.
1 Assignment
0 Petitions
Accused Products
Abstract
Aspects of the present disclosure provide techniques for using cyclic-shifts in code division multiplexing to shift transmitted signals (e.g., reference signals, control signals, and/or data) from different antenna ports of the transmitting device. Particularly, for multiple-input multiple-output (MIMO) systems that multiply the capacity of a radio link by using multiple transmit and receive antennas to exploit multipath propagation, aspects of the present disclosure minimize interference at the receiving device by separating the signals from different antenna ports based on the channel impulse response (or delay spread) of each antenna port of the channel. In some examples, the transmitting device may maximize resource utilization by interleaving the reference signals, control signals, and/or data from a plurality of antenna ports while maintaining adequate spacing between each signal.
-
Citations
30 Claims
-
1. A method for wireless communications for a base station, comprising:
-
determining a first delay spread for a first antenna port of a channel; assigning a first pilot signal for the first antenna port to a first cyclic shift of a symbol of a subframe based at least in part on the first delay spread; determining a second delay spread for a second antenna port of the channel, wherein the first antenna port and the second antenna port are different; assigning a second pilot signal for the second antenna port to a second cyclic shift of the symbol of the subframe based at least in part on one or both of the first delay spread or the second delay spread; determining remaining available cyclic shifts for the symbol of the subframe; and multiplexing data on the remaining available cyclic shifts for the symbol, wherein the data is transmitted by one or both of the first antenna port or the second antenna port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An apparatus for wireless communications, comprising:
-
a memory configured to store instructions; a processor communicatively coupled with the memory, the processor configured to execute the instructions to; determine a first delay spread for a first antenna port of a channel; assign a first pilot signal for the first antenna port to a first cyclic shift of a symbol of a subframe based at least in part on the first delay spread; determine a second delay spread for a second antenna port of the channel, wherein the first antenna port and the second antenna port are different; assign a second pilot signal for the second antenna port to a second cyclic shift of the symbol of the subframe based at least in part on one or both of the first delay spread or the second delay spread; determine remaining available cyclic shifts for the symbol of the subframe; and multiplex data on the remaining available cyclic shifts for the symbol, wherein the data is transmitted by one or both of the first antenna port or the second antenna port. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. A computer readable medium for wireless communications, comprising code for:
-
determining a first delay spread for a first antenna port of a channel; assigning a first pilot signal for the first antenna port to a first cyclic shift of a symbol of a subframe based at least in part on the first delay spread; determining a second delay spread for a second antenna port of the channel, wherein the first antenna port and the second antenna port are different; assigning a second pilot signal for the second antenna port to a second cyclic shift of the symbol of the subframe based at least in part on one or more of the first delay spread or the second delay spread; determining remaining available cyclic shifts for the symbol of the subframe; and multiplexing data on the remaining available cyclic shifts for the symbol, wherein the data is transmitted by one or both of the first antenna port or the second antenna port. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
-
25. An apparatus for wireless communications, comprising:
-
means for determining a first delay spread for a first antenna port of a channel; means for assigning a first pilot signal for the first antenna port to a first cyclic shift of a symbol of a subframe based at least in part on the first delay spread; means for determining a second delay spread for a second antenna port of the channel, wherein the first antenna port and the second antenna port are different; means for assigning a second pilot signal for the second antenna port to a second cyclic shift of the symbol of the subframe based at least in part on one or more of the first delay spread or the second delay spread; means for determining remaining available cyclic shifts for the symbol of the subframe; and means for multiplexing data on the remaining available cyclic shifts for the symbol, wherein the data is transmitted by one or both of the first antenna port or the second antenna port. - View Dependent Claims (26, 27, 28, 29, 30)
-
Specification