Phase rotation for preambles within multiple user, multiple access, and/or MIMO wireless communications

Abstract

Phase rotation for preambles within multiple user, multiple access, and/or MIMO wireless communications. An appropriately designed phase rotation vector and/or appropriately designed cyclic shift delays (CSDs) are applied to respective sub-band components of the preamble. With appropriately designed CSDs, certain fields within the preamble are not modified. For example, a legacy short training field (L-STF) of the preamble is not changed when using appropriately designed CSDs. The respective CSDs may be implemented as integer multiples of a common CSD (e.g., 0×CSD, 1×CSD, 2×CSD, etc. such that one of the values of such a CSD vector may be zero [0], another may be the common CSD itself, etc.). Also, by employing an appropriately designed phase rotation vector and integer multiples of a CSD to a preamble, the respective peak to average power ratio (PAPR) between different respective fields within the preamble may be minimized.

What is claimed is: 
     
         1 . A wireless communication device comprising:
 a processor configured to:
 receive, from another wireless communication device, a first sub-band component of a signal via a first sub-band of a communication channel, wherein the signal includes a plurality of sub-components including the first sub-band component and a second one or more sub-band components, wherein the second one or more sub-band components have undergone rotation based on a phase rotation vector, and wherein the first sub-band component and the second one or more sub-band components of the signal have undergone cyclic shift delay (CSD); 
 receive a second sub-band component of the signal via a second sub-band of the communication channel; and 
 process the first sub-band component and the second one or more sub-band components of the signal based on the CSD and the phase rotation vector to recover data transmitted from the another wireless communication device. 
   
     
     
         2 . The wireless communication device of  claim 1 , wherein the processor is further configured to:
 receive a third sub-band component of the signal via a third sub-band of the communication channel;   receive a fourth sub-band component of the signal via a fourth sub-band of the communication channel; and   process the first sub-band component, the second sub-band component, the third sub-band component, and the fourth sub-band component based on the CSD and the phase rotation vector to recover the data transmitted from the another wireless communication device.   
     
     
         3 . The wireless communication device of  claim 2 , wherein the phase rotation vector is [1, −1, −1, −1]. 
     
     
         4 . The wireless communication device of  claim 2 , wherein:
 the first sub-band of the communication channel is a first 20 MHz sub-band of an 80 MHz communication channel;   the second sub-band of the communication channel is a second 20 MHz sub-band of the 80 MHz communication channel;   the third sub-band of the communication channel is a third 20 MHz sub-band of the 80 MHz communication channel; and   the fourth sub-band of the communication channel is a fourth 20 MHz sub-band of the 80 MHz communication channel.   
     
     
         5 . The wireless communication device of  claim 1 , wherein:
 the first sub-band of the communication channel is a first 20 MHz sub-band of the communication channel; and   the second sub-band of the communication channel is a second 20 MHz sub-band of the communication channel.   
     
     
         6 . The wireless communication device of  claim 1  further comprising:
 a communication interface, coupled to the processor, that is configured to support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system; and 
 the processor configured to receive the signal from the another wireless communication device via the communication interface. 
 
     
     
         7 . The wireless communication device of  claim 1  further comprising:
 a wireless station (STA), wherein the another wireless communication device includes an access point (AP). 
 
     
     
         8 . The wireless communication device of  claim 1  further comprising:
 an access point (AP), wherein the another wireless communication device includes a wireless station (STA). 
 
     
     
         9 . A wireless communication device comprising:
 a processor configured to:
 receive, from another wireless communication device, a first sub-band component of a signal via a first sub-band of a communication channel, wherein the signal includes a plurality of sub-components including the first sub-band component and a second one or more sub-band components, wherein the second one or more sub-band components have undergone rotation based on a phase rotation vector that is [1, −1, −1, −1], and wherein the first sub-band component and the second one or more sub-band components of the signal have undergone cyclic shift delay (CSD); 
 receive a second sub-band component of the signal via a second sub-band of the communication channel; 
 receive a third sub-band component of the signal via a third sub-band of the communication channel; 
 receive a fourth sub-band component of the signal via a fourth sub-band of the communication channel; and 
 process the first sub-band component, the second sub-band component, the third sub-band component, and the fourth sub-band component of the signal based on the CSD and the phase rotation vector to recover data transmitted from the another wireless communication device. 
   
     
     
         10 . The wireless communication device of  claim 9 , wherein:
 the first sub-band of the communication channel is a first 20 MHz sub-band of an 80 MHz communication channel;   the second sub-band of the communication channel is a second 20 MHz sub-band of the 80 MHz communication channel;   the third sub-band of the communication channel is a third 20 MHz sub-band of the 80 MHz communication channel; and   the fourth sub-band of the communication channel is a fourth 20 MHz sub-band of the 80 MHz communication channel.   
     
     
         11 . The wireless communication device of  claim 9  further comprising:
 a communication interface, coupled to the processor, that is configured to support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system; and 
 the processor configured to receive the signal from the another wireless communication device via the communication interface. 
 
     
     
         12 . The wireless communication device of  claim 9  further comprising:
 a wireless station (STA), wherein the another wireless communication device includes an access point (AP). 
 
     
     
         13 . The wireless communication device of  claim 9  further comprising:
 an access point (AP), wherein the another wireless communication device includes a wireless station (STA). 
 
     
     
         14 . A method for execution by a wireless communication device, the method comprising:
 receiving, via a communication interface of the wireless communication device and from another wireless communication device, a first sub-band component of a signal via a first sub-band of a communication channel, wherein the signal includes a plurality of sub-components including the first sub-band component and a second one or more sub-band components, wherein the second one or more sub-band components have undergone rotation based on a phase rotation vector, and wherein the first sub-band component and the second one or more sub-band components of the signal have undergone cyclic shift delay (CSD);   receiving, via the communication interface of the wireless communication device and from the another wireless communication device, a second sub-band component of the signal via a second sub-band of the communication channel; and   processing the first sub-band component and the second one or more sub-band components of the signal based on the CSD and the phase rotation vector to recover data transmitted from the another wireless communication device.   
     
     
         15 . The method of  claim 14  further comprising:
 receiving, via the communication interface of the wireless communication device and from the another wireless communication device, a third sub-band component of the signal via a third sub-band of the communication channel; 
 receiving, via the communication interface of the wireless communication device and from the another wireless communication device, a fourth sub-band component of the signal via a fourth sub-band of the communication channel; and 
 processing the first sub-band component, the second sub-band component, the third sub-band component, and the fourth sub-band component based on the CSD and the phase rotation vector to recover the data transmitted from the another wireless communication device. 
 
     
     
         16 . The method of  claim 15 , wherein the phase rotation vector is [1, −1, −1, −1]. 
     
     
         17 . The method of  claim 15 , wherein:
 the first sub-band of the communication channel is a first 20 MHz sub-band of an 80 MHz communication channel;   the second sub-band of the communication channel is a second 20 MHz sub-band of the 80 MHz communication channel;   the third sub-band of the communication channel is a third 20 MHz sub-band of the 80 MHz communication channel; and   the fourth sub-band of the communication channel is a fourth 20 MHz sub-band of the 80 MHz communication channel.   
     
     
         18 . The method of  claim 14 , wherein:
 the first sub-band of the communication channel is a first 20 MHz sub-band of the communication channel; and   the second sub-band of the communication channel is a second 20 MHz sub-band of the communication channel.   
     
     
         19 . The method of  claim 14  further comprising:
 operating the communication interface of the wireless communication device to support communications within at least one of a satellite communication system, a wireless communication system, a wired communication system, a fiber-optic communication system, or a mobile communication system. 
 
     
     
         20 . The method of  claim 14 , wherein the wireless communication device includes a wireless station (STA), and the another wireless communication device includes an access point (AP).