Mapping reference signals in wireless communication systems to avoid repetition

Abstract

The described technology is generally directed towards having a transmitter in a wireless network generate and map reference signal sequences (e.g., for demodulation or other reference signal usage) so that the reference signal sequences are non-repetitive in a resource block. Avoiding repetition of the reference signal sequences reduces the peak-to-average power ratio in orthogonal frequency-division multiplexing (OFDM) systems. In one aspect, a transmitter device generates different reference signal sequences to avoid repetition of resource signal sequences, and maps the different reference signal sequences to appropriate (different) resource elements of a resource block. In one implementation, the different reference signal sequences can be based on different indexes of antenna ports. In an alternative implementation, the different reference signal sequences can be based on different code division multiplexing groups.

What is claimed is: 
     
         1 . A method, comprising:
 generating, by a transmitter device comprising a processor, respective reference signal sequences associated with antenna ports of the transmitter device, wherein the respective reference signal sequences are different and are non-repetitive within a resource block corresponding to an orthogonal frequency division multiplexing symbol for the antenna ports;   mapping, by the transmitter device, the respective reference signal sequences to different resource elements of the resource block; and   transmitting, by the transmitter device, the different resource elements to a receiver device based on the mapping.   
     
     
         2 . The method of  claim 1 , wherein generating the respective reference signal sequences is based on different code division multiplexing groups. 
     
     
         3 . The method of  claim 1 , wherein generating the respective reference signal sequences comprises generating respective demodulation reference signal sequences. 
     
     
         4 . The method of  claim 1 , wherein generating the respective reference signal sequences comprises generating respective channel state information reference signal sequences. 
     
     
         5 . The method of  claim 1 , wherein network equipment comprises the transmitter device, and wherein transmitting the different resource elements to the receiver device comprises transmitting the respective reference signal sequences as respective downlink reference signal sequences to the receiver device. 
     
     
         6 . The method of  claim 1 , wherein a user equipment comprises the transmitter device, and wherein transmitting the different resource elements to the receiver device comprises transmitting the respective reference signal sequences as respective uplink reference signal sequences to the receiver device. 
     
     
         7 . The method of  claim 1 , wherein generating the respective reference signal sequences comprises generating respective pseudo-random reference signal sequences. 
     
     
         8 . A communications device, comprising:
 a processor; and   a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, the operations comprising:
 generating respective reference signal sequences associated with antenna ports of a transmitter device, wherein the respective reference signal sequences are different and are non-repetitive within a resource block corresponding to an orthogonal frequency division multiplexing symbol for the antenna ports; 
 mapping the respective reference signal sequences to different resource elements of resource elements of the resource block; and 
 transmitting at least the different resource elements to a receiver device based on the mapping. 
   
     
     
         9 . The communications device of  claim 8 , wherein generating the respective reference signal sequences is based on different code division multiplexing groups. 
     
     
         10 . The communications device of  claim 9 , wherein generating the respective reference signal sequences comprises generating respective demodulation reference signal sequences. 
     
     
         11 . The communications device of  claim 8 , wherein generating the respective reference signal sequences comprises generating respective channel state information reference signal sequences. 
     
     
         12 . The communications device of  claim 8 , wherein the communications device is a network device configured to downlink transmit the resource block to a user equipment. 
     
     
         13 . The communications device of  claim 8 , wherein the communications device is a mobile device configured to uplink transmit the resource block to network equipment. 
     
     
         14 . The communications device of  claim 8 , wherein the respective reference signal sequences are respective pseudo-random reference signal sequences. 
     
     
         15 . A non-transitory machine-readable medium, comprising executable instructions that, when executed by a processor of a transmitter device, facilitate performance of operations, the operations comprising:
 generating respective reference signal sequences associated with antenna port indexes of a first device comprising a transmitter, wherein the respective reference signal sequences differ and do not repeat within a resource block corresponding to an orthogonal frequency division multiplexing symbol for the antenna port indexes;   mapping the respective reference signal sequences to different ones of resource elements of the resource block; and   transmitting the resource elements to a second device comprising a receiver based on the mapping.   
     
     
         16 . The non-transitory machine-readable medium of  claim 15 , wherein generating the respective reference signal sequences is based on different code division multiplexing groups. 
     
     
         17 . The non-transitory machine-readable medium of  claim 15 , wherein generating the respective reference signal sequences comprises generating respective demodulation reference signal sequences. 
     
     
         18 . The non-transitory machine-readable medium of  claim 15 , wherein generating the respective reference signal sequences comprises generating respective channel state information reference signal sequences. 
     
     
         19 . The non-transitory machine-readable medium of  claim 15 , wherein the first device comprising the transmitter is network equipment comprising the transmitter, and wherein transmitting the resource elements to the second device comprises transmitting the respective reference signal sequences as respective downlink reference signal sequences to the second device. 
     
     
         20 . The non-transitory machine-readable medium of  claim 15 , wherein the first device comprising the transmitter is a user equipment, and wherein transmitting the resource elements to the second device comprises transmitting the respective reference signal sequences as respective downlink reference signal sequences to the second device.