SMOOTH MODULATION SWITCHING
First Claim
1. A transmitter that transmits modulated signals over a communication link, the transmitter comprising:
- a channel encoder to encode data bits;
a modulator to modulate the encoded data bits, wherein the modulator selects one of a first modulation scheme and a second modulation scheme for each of a plurality of time slots;
wherein, for each time slot, the channel encoder;
includes a prefix and a suffix at the beginning and end, respectively, of the encoded data bits corresponding to the respective time slot, the prefix and the suffix being selected based on the selected modulation scheme for the respective time slot; and
passes the prefix, the encoded data bits, and the suffix to the modulator;
wherein, for each time slot, the modulator;
modulates the prefix, the encoded data bits, and the suffix received from the channel encoder according to the selected modulation scheme for the respective time slot; and
applies a window function to the prefix and the suffix.
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Accused Products
Abstract
A transmitter comprises a channel encoder to encode data bits; a modulator to modulate the encoded data bits, wherein the modulator selects one of a first modulation scheme and a second modulation scheme for each of a plurality of time slots; wherein, for each time slot, the channel encoder: includes a prefix and a suffix at the beginning and end, respectively, of the encoded data bits corresponding to the respective time slot, the prefix and the suffix being selected based on the selected modulation scheme for the respective time slot; and passes the prefix, the encoded data bits, and the suffix to the modulator; wherein, for each time slot, the modulator: modulates the prefix, the encoded data bits, and the suffix received from the channel encoder according to the selected modulation scheme for the respective time slot; and applies a window function to the prefix and the suffix.
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Citations
26 Claims
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1. A transmitter that transmits modulated signals over a communication link, the transmitter comprising:
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a channel encoder to encode data bits; a modulator to modulate the encoded data bits, wherein the modulator selects one of a first modulation scheme and a second modulation scheme for each of a plurality of time slots; wherein, for each time slot, the channel encoder; includes a prefix and a suffix at the beginning and end, respectively, of the encoded data bits corresponding to the respective time slot, the prefix and the suffix being selected based on the selected modulation scheme for the respective time slot; and passes the prefix, the encoded data bits, and the suffix to the modulator; wherein, for each time slot, the modulator; modulates the prefix, the encoded data bits, and the suffix received from the channel encoder according to the selected modulation scheme for the respective time slot; and applies a window function to the prefix and the suffix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communication system comprising:
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at least one wireless communication unit to transmit to and receive wireless signals from at least one mobile device over a communication link; and a controller coupled to the at least one wireless communication unit to wherein the at least one wireless communication unit comprises; a receiver to demodulate received signals and to decode data bits in the demodulated signals; and a transmitter to encode data bits from a data source and to modulate data bits for transmission to the at least one mobile device; wherein the transmitter selects one of a first modulation scheme and a second modulation scheme for each of a plurality of time slots; wherein, for each time slot, the transmitter; includes a prefix and a suffix at the beginning and end, respectively, of the encoded data bits corresponding to the respective time slot, the prefix and the suffix being selected based on the selected modulation scheme for the respective time slot; modulates the prefix, the encoded data bits, and the suffix according to the selected modulation scheme for the respective time slot; and applies a window function to the modulated prefix and the modulated suffix. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of communicating data in a system utilizing time slots, the method comprising:
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selecting one of a first modulation scheme and a second modulation scheme for each time slot; prepending data corresponding to each respective time slot with a prefix based on the selected modulation scheme for each respective time slot; appending the data corresponding to each respective time slot with a suffix based on the selected modulation scheme for each respective time slot; modulating the prefix, the data, and the suffix according to the selected modulation scheme for each respective time slot; applying a window function to the modulated prefix, the data, and the suffix for each time slot; and transmitting the prefix, the data, and the suffix over a communication link for each respective time slot such that at least a portion of the prefix is transmitted during a period when power levels on the communication link are at a minimum level. - View Dependent Claims (18, 19, 20, 21)
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22. A program product comprising a processor-readable medium on which program instructions are embodied, wherein the program instructions are operable, when executed by at least one programmable processor included in a device that modulates and transmits communication signals, to cause the device to:
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pre-pend a prefix to received data in each of a plurality of time slots based on a selected modulation scheme for each respective time slot; append a suffix to the received data in each respective time slot based on the selected modulation scheme for each respective time slot; modulate the prefix, the data, and the suffix according to the selected modulation scheme for each respective time slot; apply a window function to the modulated prefix, the data, and the suffix for each time slot; and transmit the prefix, the data, and the suffix over a communication link for each respective time slot such that at least a portion of the prefix is transmitted during a period when power levels on the communication link are at a minimum level. - View Dependent Claims (23, 24, 25, 26)
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Specification