Techniques and apparatuses for transmit diversity while maintaining low peak to average power ratio
Some techniques and apparatuses described herein may assign resource elements of a particular resource block for transmission by two or more different antennas in a fashion such that the symbols are interleaved in frequency and/or in time, which improves frequency diversity of the two or more different antennas, thereby improving uplink performance of the UE. In some aspects, when the two or more resource blocks are contiguous, then each antenna may produce an interleaved frequency division multiple access (IFDMA) waveform, which may maintain peak to average power ratio (PAPR) properties of a single channel FDMA transmission. Thus, some techniques and apparatuses described herein may achieve transmit diversity and/or frequency diversity of a stream of symbols on two or more antennas without significantly increasing the PAPR of the stream of symbols.
1. A method of wireless communication, comprising:
generating, by a wireless communication device having a first antenna and a second antenna, a first signal and a second signal from a set of symbols, wherein the first signal includes a first portion of the set of symbols interleaved with null values and the second signal includes a second portion of the set of symbols interleaved with null values;
assigning, by the wireless communication device, a first resource block and a second resource block for transmission of the first signal and the second signal, wherein the first antenna is assigned to transmit the first signal and the second signal during first time intervals of the first resource block and the second resource block, wherein the second antenna is assigned to transmit a modified version of the first signal and the second signal during second time intervals of the first resource block and the second resource block, and wherein the first time intervals and the second time intervals are different time intervals; and
transmitting, by the wireless communication device, the first signal and the second signal on the first time intervals using the first antenna and the modified version of the first signal and the second signal on the second time intervals using the second antenna, wherein the first signal and the second signal are interleaved with each other, and wherein the modified version of the first signal and the second signal is generated based at least in part on Alamouti encoding of the set of symbols.
2. The method of claim 1 , wherein the first time intervals and the second time intervals are interleaved in a time domain.
3. The method of claim 1 , wherein the first time intervals and the second time intervals are orthogonal in a time domain.
4. The method of claim 1 , wherein the first resource block and the second resource block are contiguous with respect to each other.
5. The method of claim 1 , wherein the first time intervals and the second time intervals are equally spaced in time.
6. The method of claim 1 , wherein the first resource block and the second resource block are not contiguous with respect to each other.
7. The method of claim 1 , wherein the first signal and the second signal are generated before a discrete Fourier transform spreading process is performed with regard to the first signal and the second signal.
8. The method of claim 1 , wherein at least one symbol, of the set of symbols, is associated with a reference signal.
9. The method of claim 1 ,
wherein a set of signals, which includes the first signal and the second signal, is generated based at least in part on a space-time block code to be transmitted on a group of antennas that includes the first antenna and the second antenna,
wherein the set of signals is configured to permit time and frequency multiplexing of the set of signals, and
wherein the set of signals are to be transmitted on the group of antennas.
10. The method of claim 1 , wherein subcarriers associated with the first signal are orthogonal to subcarriers associated with the second signal.
11. A wireless communication device, comprising:
memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
generate a first signal and a second signal from a set of symbols, wherein the first signal includes a first portion of the set of symbols interleaved with null values, and wherein the second signal includes a second portion of the set of symbols interleaved with null values;
assign a first resource block and a second resource block for transmission of the first signal and the second signal, wherein a first antenna of the wireless communication device is assigned to transmit the first signal and the second signal during first time intervals of the first resource block and the second resource block, wherein a second antenna of the wireless communication device is assigned to transmit a modified version of the first signal and the second signal during second time intervals of the first resource block and the second resource block, and wherein the first time intervals and the second time intervals are different time intervals; and
transmit the first signal and the second signal on the first time intervals using the first antenna and the modified version of the first signal and the second signal on the second time intervals using the second antenna, wherein the first signal and the second signal are interleaved with each other, and wherein the modified version of the first signal and the second signal is generated based at least in part on Alamouti encoding of the set of symbols.
12. The wireless communication device of claim 11 , wherein the first signal and the second signal are generated before a discrete Fourier transform spreading process is performed with regard to the first signal and the second signal.
13. The wireless communication device of claim 11 , wherein at least one symbol, of the set of symbols, is associated with a reference signal.
14. The wireless communication device of claim 11 , wherein a set of signals, which includes the first signal and the second signal, is generated based at least in part on a space-time block code to be transmitted on a group of antennas that includes the first antenna and the second antenna, and wherein the set of signals is configured to permit time and frequency multiplexing of the set of signals, and wherein the set of signals are to be transmitted on the group of antennas.
15. The wireless communication device of claim 11 , wherein subcarriers associated with the first signal are orthogonal to subcarriers associated with the second signal.
16. An apparatus for wireless communication, comprising:
means for generating a first signal and a second signal from a set of symbols, wherein the first signal includes a first portion of the set of symbols interleaved with null values and the second signal includes a second portion of the set of symbols interleaved with null values;
means for assigning a first resource block and a second resource block for transmission of the first signal and the second signal, wherein a first antenna of the apparatus is assigned to transmit the first signal and the second signal during first time intervals of the first resource block and the second resource block, wherein a second antenna of the apparatus is assigned to transmit a modified version of the first signal and the second signal during second time intervals of the first resource block and the second resource block, and wherein the first time intervals and the second time intervals are different time intervals; and
means for transmitting the first signal and the second signal on the first time intervals using the first antenna and the modified version of the first signal and the second signal on the second time intervals using the second antenna, wherein the first signal and the second signal are interleaved with each other, and wherein the modified version of the first signal and the second signal is generated based at least in part on Alamouti encoding of the set of symbols.
17. The apparatus of claim 16 , wherein the first signal and the second signal are generated before a discrete Fourier transform spreading process is performed with regard to the first signal and the second signal.
18. The apparatus of claim 16 , wherein at least one symbol, of the set of symbols, is associated with a reference signal.
19. The apparatus of claim 16 , wherein a set of signals, which includes the first signal and the second signal, is generated based at least in part on a space-time block code to be transmitted on a group of antennas that includes the first antenna and the second antenna, and wherein the set of signals is configured to permit time and frequency multiplexing of the set of signals, and wherein the set of signals are to be transmitted on the group of antennas.
20. The apparatus of claim 16 , wherein subcarriers associated with the first signal are orthogonal to subcarriers associated with the second signal.
21. A method of wireless communication, comprising:
assigning, by a wireless communication device having a first antenna and a second antenna, a first resource block and a second resource block for transmission of a set of symbols, wherein the first antenna is assigned to transmit a first portion of the set of symbols during first time intervals of the first resource block and the second resource block, wherein the second antenna is assigned to transmit a second portion of the set of symbols during second time intervals of the first resource block and the second resource block, and wherein the first time intervals and the second time intervals are different time intervals; and
transmitting, by the wireless communication device, the first portion of the set of symbols on the first time intervals using the first antenna and the second portion of the set of symbols on the second time intervals using the second antenna, wherein the first portion of the set of symbols on the first time intervals and the second portion of the set of symbols are interleaved with each other.
22. The method of claim 21 , wherein the first time intervals and the second time intervals are interleaved in a time domain.
23. The method of claim 21 , wherein the first time intervals and the second time intervals are orthogonal in a time domain.
24. The method of claim 21 , wherein the first resource block and the second resource block are contiguous with respect to each other.
25. The method of claim 21 , wherein the first time intervals and the second time intervals are equally spaced in time.
26. The method of claim 21 , wherein the first resource block and the second resource block are not contiguous with respect to each other.
27. The method of claim 21 ,
wherein a first signal and a second signal are to be generated based at least in part on the set of symbols,
wherein the first time intervals are for transmission of the first signal and the second signal, and
wherein the second time intervals are for transmission of a modified version of the first signal and a modified version of the second signal.
28. The method of claim 27 , wherein the modified version of the first signal and the modified version of the second signal are configured based at least in part on a space-time block code to enable combination of the first signal, the second signal, the modified version of the first signal, and the modified version of the second signal to obtain the set of symbols.
29. The method of claim 27 , wherein the first signal and the second signal are generated before a discrete Fourier transform spreading process is performed with regard to the first signal and the second signal.
30. The method of claim 21 , wherein at least one symbol, of the set of symbols, is associated with a reference signal.