Pilot scrambling for channel estimation
AssigneeCohere Technologies, Inc.
InventorsShachar Kons, Michail Tsatsanis
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Abstract
A wireless communication technique to improve channel estimation using pilot signals includes receiving data symbols for transmission over a wireless communication channel using multiple antenna ports, generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports, mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence, multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal, and transmitting the output signal over a wireless communication channel.
Claims19
A method of wireless communication, comprising:
- receiving data symbols for transmission over a wireless communication channel using multiple antenna ports;
- generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports;
- mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence;
- multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal comprising an OFDM symbol;
- and
- transmitting the output signal over a wireless communication channel,
- wherein the generating the plurality of scrambling sequences comprises:
- using a pseudorandom number generator to generate a pseudorandom sequence,
- generating a plurality of circular shifts based on evenly dividing a length of the OFDM symbol, and
- generating each of the plurality of scrambling sequences by performing a circular shift operation on the pseudorandom sequence using each of the plurality of circular shifts for the each antenna port.
A wireless communication device comprising a memory storing instruction and a processor, wherein the instructions, when executed by the processor, cause the processor to implement a method comprising:
- receiving data symbols for transmission over a wireless communication channel using multiple antenna ports;
- generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports;
- mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence;
- multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal;
- and
- transmitting the output signal over a wireless communication channel,
- wherein the generating the plurality of scrambling sequences includes using a different pseudorandom number generator to generate a pseudorandom sequence for each antenna port.
A wireless signal transmission apparatus comprising a processor, configured to:
- receive data symbols for transmission over a wireless communication channel using multiple antenna ports;
- generate a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports;
- map, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence;
- multiplex a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal;
- and
- cause a transmission of the output signal over a wireless communication channel,
- wherein generating the plurality of scrambling sequences comprises:
- using a pseudorandom number generator to generate a pseudorandom sequence,
- generating a plurality of circular shifts based on evenly dividing a length of the OFDM symbol, and
- generating each of the plurality of scrambling sequences by performing a circular shift operation on the pseudorandom sequence using each of the plurality of circular shifts for the each antenna port.
Dependencies are inferred from the claim text.