Efficiently identifying system waveform in uplink transmission
Systems and methodologies are described that facilitate indicating a type of waveform utilized for uplink transmission in a wireless communication environment. An access terminal can select a type of waveform from a set of possible waveform types. Moreover, a reference signal can be generated based upon the selected type of waveform. For instance, a sequence employed to yield the reference signal can be generated and/or chosen as a function of the selected type of waveform. According to another illustration, a tone location and/or a symbol location of the reference signal can as part of the uplink transmission to the base station from the access terminal. The base station can detect the selected type of waveform utilized by the access terminal for the uplink transmission based upon parameter(s) recognized from the reference signal.
1. A method that facilitates recognizing utilized waveform type in a wireless communication environment, comprising:
receiving an uplink transmission that includes a reference signal;
recognizing a parameter associated with the received reference signal; and
detecting whether a single carrier-frequency division multiple access (SC-FDMA) waveform or an orthogonal frequency division multiple access (OFDMA) waveform is utilized for the uplink transmission based on the recognized parameter, and wherein the SC-FDMA waveform utilizes single carrier modulation and frequency domain equalization.
2. The method of claim 1 , wherein the reference signal is a demodulation reference signal.
3. The method of claim 1 , further comprising transmitting a signal indicating a base station selected type of waveform to be used for the uplink transmission.
4. The method of claim 1 , wherein the parameter is an identity of a Zadoff-Chu sequence associated with the reference signal.
5. The method of claim 4 , further comprising evaluating the identity of the Zadoff-Chu sequence based upon energy detection after correlation with a local copy of an assumed Zadoff-Chu sequence.
6. The method of claim 5 , evaluating the identity of the Zadoff-Chu sequence further comprises detecting at least one of a cyclic shift of the Zadoff-Chu sequence, a root index of the Zadoff-Chu sequence, or whether a discrete Fourier transform (DFT) / fast Fourier transform (FFT) operation was applied to the Zadoff-Chu sequence prior to application of an inverse fast Fourier transform (IFFT) operation.
7. The method of claim 1 , wherein the parameter is at least one of a symbol location or a tone location at which the reference signal is carried.
8. The method of claim 1 , further comprising leveraging the detected type of waveform to at least one of decode or demodulate the uplink transmission.
9. A wireless communications apparatus, comprising:
a memory that retains instructions related to obtaining an uplink transmission that includes a demodulation reference signal, identifying a parameter associated with the received demodulation reference signal, and detecting whether a single carrier-frequency division multiple access (SC-FDMA) waveform or an orthogonal frequency division multiple access (OFDMA) waveform is utilized for the uplink transmission based on the recognized parameter, and wherein the SC-FDMA waveform utilizes single carrier modulation and frequency domain equalization; and
a processor, coupled to the memory, configured to execute the instructions retained in the memory.
10. The wireless communications apparatus of claim 9 , wherein the memory further retains instructions related to transmitting a signal indicating a base station selected type of waveform to be used for the uplink transmission.
11. The wireless communications apparatus of claim 9 , wherein the parameter is one or more of an identity of a Zadoff-Chu sequence associated with the demodulation reference signal, a symbol location of the demodulation reference signal, or a tone location of the demodulation reference signal.
12. The wireless communications apparatus of claim 11 , wherein the memory further retains instructions related to analyzing the identity of the Zadoff-Chu sequence based upon energy detection after correlation with a local copy of an assumed Zadoff-Chu sequence.
13. A wireless communications apparatus that enables recognizing utilized waveform type in a wireless communication environment, comprising:
means for identifying a parameter associated with a reference signal included within a received uplink transmission; and
means for detecting whether a single carrier-frequency division multiple access (SC-FDMA) waveform or an orthogonal frequency division multiple access (OFDMA) waveform is utilized for the uplink transmission based on the recognized parameter, and wherein the SC-FDMA waveform utilizes single carrier modulation and frequency domain equalization.
14. The wireless communications apparatus of claim 13 , further comprising means for transmitting a signal to control the type of waveform utilized for the uplink transmission.
15. The wireless communications apparatus of claim 13 , wherein the parameter is one or more of an identity of a Zadoff-Chu sequence associated with the reference signal, a symbol location of the reference signal, or a tone location of the reference signal.
16. A non-transitory computer-readable medium having computer executable code stored thereon, comprising:
code for identifying a parameter associated with a reference signal included within a received uplink transmission; and
code for detecting whether a single carrier-frequency division multiple access (SC-FDMA) waveform or an orthogonal frequency division multiple access (OFDMA) waveform is utilized for the uplink transmission based on the recognized parameter, and wherein the SC-FDMA waveform utilizes single carrier modulation and frequency domain equalization.
17. The non-transitory computer-readable medium of claim 16 , further comprising:
code for transmitting a signal to control the type of waveform utilized for the uplink transmission.
18. The non-transitory computer-readable medium of claim 16 , wherein the parameter is one or more of an identity of a Zadoff-Chu sequence associated with the reference signal, a symbol location of the reference signal, or a tone location of the reference signal.
19. A wireless communications apparatus, comprising:
a processor configured to:
receive an uplink transmission that includes a demodulation reference signal;
recognize a parameter associated with the received demodulation reference signal, wherein the parameter is at least one of an identity of a Zadoff-Chu sequence associated with the demodulation reference signal, a symbol location of the demodulation reference signal, or a tone location of the demodulation reference signal;
detect whether a single carrier-frequency division multiple access (SC-FDMA) waveform or an orthogonal frequency division multiple access (OFDMA) waveform is utilized for the uplink transmission based on the recognized parameter, and wherein the SC-FDMA waveform utilizes single carrier modulation and frequency domain equalization; and
decode the uplink transmission based upon the detected type of waveform.