Techniques to decrease signal amplitude peak-to-average ratio in a wireless communications system
View Patent ↗Techniques to reduce signal amplitude peak-to-average ratio (PAR) in a wireless communications system are described. The apparatus may include a signal conditioning module to receive a baseband signal. The signal conditioning module may split the baseband signal along multiple paths, delay one or more of the paths, and combine the multiple paths to form a conditioned signal having lower signal amplitude PAR than the baseband signal. Other embodiments are described and claimed.
1. An apparatus, comprising:
a signal conditioning module to receive a baseband signal, said signal conditioning module comprising:
multiple parallel paths for splitting said baseband signal, the multiple parallel paths comprise n paths having gain factors α 1 , . . . ,α n , where α 1 +α 2 + . . . +α n = 1 and n comprises a positive integer value, the multiple parallel paths comprising a first path wherein the baseband signal is provided directly to an amplifier;
a delay block for delaying each of the subsequent multiple parallel paths; and
a combiner block to combine said multiple parallel paths to form a conditioned signal having a lower signal amplitude peak-to-average ratio than said baseband signal.
2. The apparatus of claim 1 , wherein said baseband signal comprises a code division multiple access signal.
3. The apparatus of claim 1 , wherein said multiple parallel paths comprise the first path having a gain factor α and a second path having a gain factor (1-α).
4. The apparatus of claim 1 , wherein said delay block comprises a delay value greater than one chip time.
5. The apparatus of claim 1 , wherein said conditioning module provides said conditioned signal to a power amplifier module.
6. The apparatus of claim 1 , wherein said conditioned signal comprises less spurious out-of-band emissions than a clipped signal.
7. A system, comprising:
an antenna; and
a transmitter node to couple to said antenna, said transmitter node comprising:
a signal conditioning module to receive a baseband signal, said signal conditioning module comprising:
multiple parallel paths for splitting said baseband signal, the multiple parallel paths comprise n paths having gain factors α 1 , . . . ,α n , where α 1 +α 2 + . . . +α n = 1 and n comprises a positive integer value, the multiple parallel paths comprising a first path wherein the baseband signal is provided directly to an amplifier;
a delay block for delaying each of the subsequent multiple parallel paths; and
a combiner block to combine said multiple parallel paths to form a conditioned signal having a lower signal amplitude peak-to-average ratio than said baseband signal.
8. The system of claim 7 , wherein said baseband signal comprises a code division multiple access signal.
9. The system of claim 7 , wherein said multiple parallel paths comprise the first path having a gain factor α and a second path having a gain factor (1-α).
10. The system of claim 7 , wherein said delay block comprises a delay factor greater than one chip time.
11. The system of claim 7 , wherein said signal conditioning module provides said conditioned signal to a power amplifier module.
12. The system of claim 7 , wherein said conditioned signal comprises less spurious out-of-band emissions than a clipped signal.
13. The system of claim 7 , wherein said transmitter node transits said conditioned signal to a receiver node.
14. The system of claim 13 , wherein said receiver node comprises an equalization module for recovering said baseband signal.
15. The system of claim 13 , wherein said receiver node comprises a rake receiver.
16. A method, comprising:
receiving a baseband signal at a signal conditioning module;
splitting said baseband signal along multiple parallel paths, the multiple parallel paths comprise n paths having gain factors α 1 , . . . ,α n , where α 1 +α 2 + . . . +α n = 1 and n comprises a positive integer value;
providing said baseband signal along a first path directly to an amplifier;
delaying each of the subsequent multiple parallel paths; and
combining said multiple parallel paths to form a conditioned signal having a lower signal amplitude peak-to-average ratio than said baseband signal.
17. The method of claim 16 , wherein said baseband signal comprises a code division multiple access signal.
18. The method of claim 16 , wherein said multiple parallel paths comprise the first path having a gain factor α and the second path having a gain factor (1-α).
19. The method of claim 16 , wherein delaying comprises more than one chip time.
20. The method of claim 16 , further comprising providing said conditioned signal to a power amplifier module.
21. The method of claim 16 , wherein said conditioned signal comprises less spurious out-of-band emissions than a clipped signal.
22. The method of claim 16 , further comprising transmitting said conditioned signal to a receiver.