Methodology and method and apparatus for signaling with capacity optimized constellations
First Claim
1. A digital communication system, comprising:
- a transmitter configured to transmit signals to a receiver via a communication channel;
wherein the transmitter, comprises;
a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate;
a mapper configured to map encoded bits to symbols in a symbol constellation;
a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper;
wherein the receiver, comprises;
a demodulator configured to demodulate the received signal via the communication channel;
a demapper configured to estimate likelihoods from the demodulated signal;
a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper; and
wherein the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin.
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Accused Products
Abstract
Communication systems having transmitter, includes a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate, a mapper configured to map encoded bits to symbols in a symbol constellation, a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper. In addition, the receiver includes a demodulator configured to demodulate the received signal via the communication channel, a demapper configured to estimate likelihoods from the demodulated signal, a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper. Furthermore, the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin.
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Citations
23 Claims
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1. A digital communication system, comprising:
a transmitter configured to transmit signals to a receiver via a communication channel; wherein the transmitter, comprises; a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate; a mapper configured to map encoded bits to symbols in a symbol constellation; a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper; wherein the receiver, comprises; a demodulator configured to demodulate the received signal via the communication channel; a demapper configured to estimate likelihoods from the demodulated signal; a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper; and wherein the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of transmitting bits of user information between a transmitter and a receiver over a communication channel, comprising:
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using a coder within the transmitter to encode the bits of user information in accordance with a coding scheme; using a mapper within the transmitter to map the encoded bits of user information to a symbol constellation, wherein the symbol constellation is a capacity optimized geometrically spaced symbol constellation that provides a given capacity at a reduced signal-to-noise ratio compared to a signal constellation that maximizes dmin; using a modulator within the transmitter to modulate the symbols in accordance with a modulation scheme; transmitting the modulated signal via the communication channel using the transmitter; receiving a modulated signal at the receiver; using a demodulator within the receiver to demodulate the modulated signal in accordance with the modulation scheme; using a demapper within the receiver to demap the demodulated signal using the geometrically shaped signal constellation to produce likelihoods; and decoding the likelihoods using the receiver to obtain an estimate of the decoded bits. - View Dependent Claims (21, 22)
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23. A method of transmitting bits of user information between a transmitter and a receiver over a communication channel, comprising:
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transmitting information over a channel using a geometrically shaped symbol constellation; determining the locations of points within a symbol constellation having a fixed number of constellation point to achieve an initial target user data rate; configuring the transmitter and the receiver using the symbol constellation; using the transmitter to; encode the bits of user information in accordance with a coding scheme; map the encoded bits of user information to the symbol constellation; modulate the symbols in accordance with a modulation scheme; transmit the modulated signal via the communication channel; using the receiver to; receive modulated signals transmitted by the transmitter; demodulate the modulated signal in accordance with the modulation scheme; demap the demodulated signal using the signal constellation to produce likelihoods; decode the likelihoods to obtain an estimate of the decoded bits; modifying the locations of the fixed number of points within the geometrically shaped symbol constellation to change the target user data rate; and configuring the transmitter and the receiver with the modified symbol constellation during the transmission of bits of user information.
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Specification