Methods and apparatuses for signaling with geometric constellations in a rayleigh fading channel
First Claim
1. A communication system, comprising:
- a transmitter capable of transmitting signals to a receiver via a communication channel;
wherein the transmitter comprises;
a coder capable of receiving user bits and output encoded bits using a code having a specific code rate;
a mapper capable of mapping encoded bits to symbols in a non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM
1024);
a modulator capable of generating a signal for transmission via the communication channel using symbols generated by the mapper;
wherein the receiver comprises;
a demodulator capable of demodulating a signal received via the communication channel;
a demapper capable of estimating likelihoods from a demodulated signal based upon the NU-QAM 1024; and
a decoder capable of estimating decoded bits from likelihoods generated by the demapper based upon the code;
wherein the NU-QAM 1024 comprises an in-phase component and a quadrature component, where each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 1.289 from the following set of amplitudes;
−
38.8088, −
31.7370, −
26.1892, −
25.0630, −
18.4668, −
18.4668, −
16.6894, −
16.6675, −
9.2115, −
9.2115, −
9.0888, −
9.0480, −
3.7549, −
3.7549, −
3.7549, −
3.7549, 3.7539, 3.7539, 3.7539, 3.7539, 9.0476, 9.0509, 9.2107, 9.2107, 16.6677, 16.6875, 18.4662, 18.4662, 25.0617, 26.1893, 31.7383, and 38.8190.
2 Assignments
0 Petitions
Accused Products
Abstract
Communication systems are described that use signal constellations, which have unequally spaced (i.e. ‘geometrically’ shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR, over the Rayleigh fading channel. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes dmin, are also described. Capacity measures that are used in the selection of the location of constellation points include, but are not limited to, parallel decode (PD) capacity and joint capacity.
77 Citations
28 Claims
-
1. A communication system, comprising:
-
a transmitter capable of transmitting signals to a receiver via a communication channel; wherein the transmitter comprises; a coder capable of receiving user bits and output encoded bits using a code having a specific code rate; a mapper capable of mapping encoded bits to symbols in a non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM
1024);a modulator capable of generating a signal for transmission via the communication channel using symbols generated by the mapper; wherein the receiver comprises; a demodulator capable of demodulating a signal received via the communication channel; a demapper capable of estimating likelihoods from a demodulated signal based upon the NU-QAM 1024; and a decoder capable of estimating decoded bits from likelihoods generated by the demapper based upon the code; wherein the NU-QAM 1024 comprises an in-phase component and a quadrature component, where each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 1.289 from the following set of amplitudes; −
38.8088, −
31.7370, −
26.1892, −
25.0630, −
18.4668, −
18.4668, −
16.6894, −
16.6675, −
9.2115, −
9.2115, −
9.0888, −
9.0480, −
3.7549, −
3.7549, −
3.7549, −
3.7549, 3.7539, 3.7539, 3.7539, 3.7539, 9.0476, 9.0509, 9.2107, 9.2107, 16.6677, 16.6875, 18.4662, 18.4662, 25.0617, 26.1893, 31.7383, and 38.8190.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A communication system, comprising:
-
a transmitter capable of transmitting signals via a communication channel; wherein the transmitter comprises; a coder capable of receiving user bits and output encoded bits using a code having a specific code rate; a mapper capable of mapping encoded bits to symbols in a non-uniform quadrature amplitude modulation 1024-point symbol constellation (NU-QAM
1024);a modulator capable of generating a signal for transmission via the communication channel using symbols generated by the mapper; wherein the NU-QAM 1024 comprises an in-phase component and a quadrature component, where each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 1.289 from the following set of amplitudes; −
38.8088, −
31.7370, −
26.1892, −
25.0630, −
18.4668, −
18.4668, −
16.6894, −
16.6675, −
9.2115, −
9.2115, −
9.0888, −
9.0480, −
3.7549, −
3.7549, −
3.7549, −
3.7549, 3.7539, 3.7539, 3.7539, 3.7539, 9.0476, 9.0509, 9.2107, 9.2107, 16.6677, 16.6875, 18.4662, 18.4662, 25.0617, 26.1893, 31.7383, and 38.8190.- View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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-
19. A communication system, comprising:
-
a receiver capable of receiving signals via a communication channel; wherein the receiver comprises; a demodulator capable of demodulating a signal received via the communication channel; a demapper capable of estimating likelihoods from a demodulated signal based upon the NU-QAM 1024; and a decoder capable of estimating decoded bits from likelihoods generated by the demapper using a code having a specific code rate; and wherein the NU-QAM 1024 comprises an in-phase component and a quadrature component, where each component comprises 32 levels of amplitude such that the amplitudes scaled by a scaling factor are within 1.289 from the following set of amplitudes; −
38.8088, −
31.7370, −
26.1892, −
25.0630, −
18.4668, −
18.4668, −
16.6894, −
16.6675, −
9.2115, −
9.2115, −
9.0888, −
9.0480, −
3.7549, −
3.7549, −
3.7549, −
3.7549, 3.7539, 3.7539, 3.7539, 3.7539, 9.0476, 9.0509, 9.2107, 9.2107, 16.6677, 16.6875, 18.4662, 18.4662, 25.0617, 26.1893, 31.7383, and 38.8190.- View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification