Mobile wireless communications device for modulations with memory
View Patent ↗A mobile wireless communications device may include an antenna, and a transceiver coupled to the antenna. The transceiver may use a modulation having memory for a message in a frame structure including a data portion and a termination portion based upon the data portion. The termination portion may drive the modulation to a desired known ending state. The modulation may include a spread spectrum modulation or a non-spread modulation.
1. A mobile wireless communications device comprising:
an antenna; and
a transceiver coupled to said antenna and configured to use a modulation having memory and corresponding trellis memory states for a message in a frame structure, the frame structure including a data portion and a termination portion, the termination portion being based upon the data portion and a number of trellis memory states, driving the modulation to a desired known ending trellis memory state, and having a length based upon a memory length of the modulation.
2. The mobile wireless communications device according to claim 1 wherein the frame structure further comprises a channel estimate portion.
3. The mobile wireless communications device according to claim 1 wherein the modulation comprises a spread spectrum modulation.
4. The mobile wireless communications device according to claim 1 wherein the modulation comprises a non-spread modulation.
5. The mobile wireless communications device according to claim 1 wherein the modulation comprises at least one of a continuous phase modulation (CPM), a Gaussian minimum shift keying (GMSK), a differential phase shift keying (DPSK), and a minimum-shift keying (MSK).
6. The mobile wireless communications device according to claim 1 further comprising a housing carrying said antenna and said transceiver.
7. A mobile wireless communications device comprising:
an antenna; and
a transceiver coupled to said antenna and configured to use a spread spectrum modulation having memory and corresponding trellis memory states for a message in a frame structure including a data portion, a termination portion based upon the data portion and a number of trellis memory states, and a channel estimate portion;
the termination portion for driving the spread spectrum modulation to a desired known ending trellis memory state and having a length based upon a memory length of the spread spectrum modulation.
8. The mobile wireless communications device according to claim 7 wherein the spread spectrum modulation comprises at least one of a continuous phase modulation (CPM), a Gaussian minimum shift keying (GMSK), a differential phase shift keying (DPSK), and a minimum-shift keying (MSK).
9. A wireless communication system using a modulation having memory and corresponding trellis memory states, the wireless communication system comprising:
a transmitter mobile wireless communications device comprising
an antenna, and
a transmitter coupled to said antenna and configured to transmit a message in a frame structure including a data portion and a termination portion based upon the data portion and a number of trellis memory states, and to use the termination portion for driving the modulation to a desired known ending trellis memory state, the termination portion having a length based upon a memory length of the modulation; and
a receiver mobile wireless communications device comprising
an antenna, and
a receiver coupled to said antenna and configured to receive the message.
10. The wireless communication system according to claim 9 wherein the frame structure further comprises a channel estimate portion.
11. The wireless communication system according to claim 9 wherein the modulation comprises a spread spectrum modulation.
12. The wireless communication system according to claim 9 wherein the modulation comprises a non-spread modulation.
13. A method for operating a mobile wireless communications device having an antenna, and a transceiver coupled thereto, the method comprising:
operating the antenna and the transceiver to use a modulation having memory and corresponding trellis memory states for a message in a frame structure including a data portion, and insert a termination portion based upon the data portion and a number of trellis memory states into the frame structure;
the termination portion driving the modulation to a desired known ending trellis memory state and having a length based upon a memory length of the modulation.
14. The method according to claim 13 wherein the frame structure further comprises a channel estimate portion.
15. The method according to claim 13 wherein the modulation comprises a spread spectrum modulation.
16. The method according to claim 13 wherein the modulation comprises a non-spread modulation.
17. The method according to claim 13 wherein the modulation comprises at least one of a continuous phase modulation (CPM), a Gaussian minimum shift keying (GMSK), a differential phase shift keying (DPSK), and a minimum-shift keying (MSK).