Communications system and bit-loading method used in a communications system
First Claim
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1. A method for transmitting data via a power-line network, the method comprising:
- receiving data bits to be transmitted;
loading multiple copies of the data bits in a multi-dimension modulation scheme matrix, the dimensions being selected from frequency, time and code, each dimension being divided into sub-groups,allocating copies of each data bit within the matrix according to a predetermined arrangement so that within each dimension copies of the same data bit reside within different sub-groups;
wherein within each dimension the predetermined arrangement specifies positions of the copies of the data bits, such that the position of each successive copy of a respective data bit is specified according to a progression with respect to the position of the preceding copy of that data bit;
wherein the progression for one or more of the dimensions is based on an arithmetic function, and wherein for one or more of the dimensions, the number of sub-groups between successive copies of a respective data bit varies across the matrix;
modulating a signal in accordance with the modulation scheme matrix; and
transmitting the signal via a mains power line.
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Abstract
A communications system comprises a transmitter, receiver and channel. The transmitter transmits multiple copies of each data bit in a multi-dimension modulation scheme matrix, the dimensions being selected from frequency, time and code. Each dimension is divided into sub-groups. A bit-loading method is used such that copies of each data bit (b11, b12, b13) are allocated within the matrix according to a predetermined arrangement so that within each dimension copies of the same data bit reside within different sub-groups.
16 Citations
32 Claims
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1. A method for transmitting data via a power-line network, the method comprising:
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receiving data bits to be transmitted; loading multiple copies of the data bits in a multi-dimension modulation scheme matrix, the dimensions being selected from frequency, time and code, each dimension being divided into sub-groups, allocating copies of each data bit within the matrix according to a predetermined arrangement so that within each dimension copies of the same data bit reside within different sub-groups;
wherein within each dimension the predetermined arrangement specifies positions of the copies of the data bits, such that the position of each successive copy of a respective data bit is specified according to a progression with respect to the position of the preceding copy of that data bit;wherein the progression for one or more of the dimensions is based on an arithmetic function, and wherein for one or more of the dimensions, the number of sub-groups between successive copies of a respective data bit varies across the matrix; modulating a signal in accordance with the modulation scheme matrix; and transmitting the signal via a mains power line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A transmitter comprising:
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means for receiving data bits to be transmitted; a bit-loading module for loading multiple copies of data bits in a multi-dimension modulation scheme matrix, the dimensions being selected from frequency, time and code, each dimension being divided into sub-groups, wherein the module is configured to allocate copies of each data bit within the matrix according to a predetermined arrangement so that within each dimension copies of the same data bit reside within different sub-groups, wherein within each dimension the predetermined arrangement specifies positions of the copies of the data bits, such that the position of each successive copy of a respective data bit is specified according to a progression with respect to the position of the preceding copy of that data bit; wherein the progression for one or more of the dimensions is based on an arithmetic function, and wherein for one or more of the dimensions, the number of sub-groups between successive copies of a respective data bit varies across the matrix; means for modulating a signal in accordance with the modulation scheme; and means adapted to transmit the modulated signal via a mains power line. - View Dependent Claims (16, 17, 18, 19)
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20. A receiver comprising:
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means adapted to receive, via a mains power line, data bits that arc encoded as a signal that is modulated in multiple dimensions selected from time, frequency and code, the modulation being based on a multi-dimension modulation scheme matrix in which each dimension of the matrix is divided into sub-groups with copies of the respective data bits being arranged in the matrix according to a predetermined arrangement, such that within each dimension copies of the same data hit reside within different sub-groups, wherein within each dimension the predetermined arrangement specifies positions of the copies of the data bits, such that the position of each successive copy of a respective data bit is specified according to a progression with respect to the position of the preceding copy of that data bit; wherein the progression for one or more of the dimensions is based on an arithmetic function, and wherein for one or more of the dimensions, the number of sub-groups between successive copies of a respective data hit varies across the matrix; means for demodulating the modulated signal in accordance with the multi-dimension scheme matrix; a decoding module for decoding the demodulated signal to recover copies of the data bits on which the modulation is based; and means for determining a value of the received data bits. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A modem comprising:
a transmitter comprising; means for receiving data bits to be transmitted; a bit-loading module for loading multiple copies of data bits in a multi-dimension modulation scheme matrix, the dimensions being selected from frequency, time and code, each dimension being divided into sub-groups, wherein the module is configured to allocate copies of each data bit within the matrix according to a predetermined arrangements so that within each dimension copies of the same data bit reside within different sub-groups, wherein within each dimension the predetermined arrangement specifies positions of the copies of the data bits, such that the position of each successive copy of a respective data bit is specified according to a progression with respect to the position of the preceding copy of that data bit, wherein the progression for one or more of the dimensions is based on an arithmetic function, and wherein for one or more of the dimensions, the number of sub-groups between successive copies of a respective data bit varies across the matrix; means for modulating a signal in accordance with the modulation scheme; and means adapted to transmit the modulated signal via a mains power line; and
a receiver comprising;means adapted to receive the modulated signal via the mains power line; means for demodulating the modulated signal in accordance with the multi-dimension modulation scheme matrix; a decoding module for decoding the demodulated signal to recover copies of the data bits on which the modulation is based; and means for determining a value of the received data bits. - View Dependent Claims (30, 31)
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32. A communications system comprising:
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a transmitter for transmitting a signal, the transmitter comprising; means for receiving data bits to be transmitted; a bit-loading module for loading multiple copies of data bits in a multi-dimension modulation scheme matrix, the dimensions being selected from frequency, time and code, each dimension being divided into sub-groups, wherein the module is configured to allocate copies of each data bit within the matrix according to a predetermined arrangements so that within each dimension copies of the same data bit reside within different sub-groups; wherein within each dimension the predetermined arrangement specifies positions of the copies of the data bits, such that the position of each successive copy of a respective data bit is specified according to a progression with respect to the position of the preceding copy of that data bit, wherein the progression for one or more of the dimensions is based on an arithmetic function, and wherein for one or more of the dimensions, the number of sub-groups between successive copies of a respective data bit varies across the matrix; means for modulating a signal in accordance with the modulation scheme; and means adapted to transmit the modulated signal via a mains power line;
a channel on which the transmitted signal is to he carried; and
a receiver for receiving the transmitted signal, the receiver comprising;means adapted to receive the modulated signal via the mains power line; means for demodulating the modulated signal in accordance with the multi-dimension modulation scheme matrix; a decoding module for decoding the demodulated signal to recover copies of the data bits on which the modulation is based; and means for determining a value of the received data bits.
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Specification