Pipeline architecture for multi-slot wireless link processing
View Patent ↗A wireless communication device processes N Radio Frequency (RF) bursts contained within N slots of a digital communications time divided frame, wherein N is a positive integer greater than one. The wireless communication device includes an RF front end, a baseband processor, and an equalizer module. The RF front end is operable to receive the plurality of received RF bursts and to convert the RF bursts to corresponding baseband signals. The baseband processor is operable to receive the baseband signals, to pre-equalization process the baseband signals to produce processed baseband signals, and to post-equalization process soft decisions. The equalizer is operable to equalize the processed baseband signals to produce the soft decisions. These RF bursts may be contained in adjacent slots or, in non-adjacent slots, or in a combination of adjacent slots and non-adjacent slots.
1. A method for processing a multi-slot Time Division Multiple Access (TDMA) signal by a wireless device, wherein the TDMA signal is received over a plurality of time periods as a first section followed by a second section followed by a third section, the method comprising:
pre-processing the first section;
pre-processing the second section while equalizing the first section;
post-processing the first section while equalizing the second section;
pre-processing the third section while equalizing the second section; and
post-processing the second section while equalizing the third section.
2. The method of claim 1 , further comprising:
determining a modulation of the first section; and
equalizing the first section based upon a determined modulation.
3. The method of claim 2 , wherein equalizing the first section comprises:
Maximum Likelihood Sequence Estimation (MLSE) equalizing the first section when a determined modulation is Gaussian Minimum Shift Keying (GMSK); and
Maximum A posteriori Probability (MAP) equalizing the first section when the determined modulation is Eight Phase Shift Keying (8PSK).
4. The method of claim 1 , wherein pre-processing includes at least one of:
de-rotation and frequency correction;
burst power estimation;
timing, channel, noise, and Signal-to-Noise Ratio estimation;
Automatic Gain Control loop processing;
soft decision scaling factor processing; and
matched filter processing.
5. The method of claim 1 , wherein pre-processing includes at least one of:
equalizer coefficient calculation; and
soft decision scaling factor processing.
6. The method of claim 1 , wherein post-processing includes at least one of:
phase averaging of a plurality of soft decisions; and
frequency estimation and tracking.
7. The method of claim 1 , wherein:
pre-processing is performed by a baseband processor;
post-processing is performed by the baseband processor; and
equalization is performed by an equalizer module.
8. A wireless device operable to process a multi-slot Time Division Multiple Access (TDMA) signal, wherein the TDMA signal is received over a plurality of time periods as a first section followed by a second section followed by a third section, the wireless device comprising:
a baseband processor operable to:
pre-process the third section; and
post-process the first section; and
an equalizer module coupled to the baseband processor and operable to equalize the second section,
wherein the equalizer module is operable to equalize the second section during the same or substantially the same time period(s) as the baseband processor is operable to pre-process the third section and/or post-process the first section.
9. The wireless device of claim 8 , wherein in the baseband processor is further operable to determine a modulation type.
10. The wireless device of claim 9 , wherein the modulation type is one of Gaussian Minimum Shift Keying (GMSK) and Eight Phase Shift Keying (8PSK).
11. The wireless device of claim 8 , wherein the baseband processor is operable to equalize the second section by one of Maximum Likelihood Sequence Estimation (MLSE) equalizing and Maximum A posteriori Probability (MAP) equalizing.
12. The wireless device of claim 8 , wherein the baseband processor is operable to pre-process the third section by one or more of:
de-rotation and frequency correction;
burst power estimation;
timing estimation;
channel estimation;
equalizer coefficient calculation;
automatic gain control loop processing;
soft decision scaling factor processing; and
matched filter processing.
13. The wireless device of claim 8 , wherein the baseband processor is operable to post-process the first section by one or more of:
phase averaging of a plurality of soft decisions;
frequency estimation; and
frequency tracking.
14. A wireless device for processing a multi-slot Time Division Multiple Access (TDMA) signal, wherein the TDMA signal is received over a plurality of time periods as a first section followed by a second section followed by a third section, the wireless device comprising:
a baseband processor; and
an equalizer module coupled to the baseband processor,
wherein, in combination, the baseband processor and equalizer module are operable to:
pre-process the first section;
pre-process the second section while equalizing the first section;
post-process the first section while equalizing the second section;
pre-process the third section while equalizing the second section; and
post-process the second section while equalizing the third section.
15. The wireless device of claim 14 , wherein, in combination, the baseband processor and equalizer module are further operable to:
determine a modulation of the first section; and
equalize the first section based upon a determined modulation.
16. The wireless device of claim 15 , wherein the equalizer module is operable to:
Maximum Likelihood Sequence Estimation (MLSE) equalize the first section when a determined modulation is Gaussian Minimum Shift Keying (GMSK); and
Maximum A posteriori Probability (MAP) equalize the first section when the determined modulation is Eight Phase Shift Keying (8PSK).
17. The wireless device of claim 14 , wherein pre- processing includes at least one of:
de-rotation and frequency correction;
burst power estimation;
timing, channel, noise, and Signal-to-Noise Ratio estimation;
Automatic Gain Control loop processing;
soft decision scaling factor processing; and
matched filter processing.
18. The wireless device of claim 14 , wherein pre-processing includes at least one of:
equalizer coefficient calculation; and
soft decision scaling factor processing.
19. The wireless device of claim 14 , wherein the post-processing includes at least one of:
phase averaging of a plurality of soft decisions; and
frequency estimation and tracking.