Methods and devices for communications systems using multiplied rate transmission
First Claim
1. A communication system comprising:
- a transmitter comprising;
a covariance inducing module configured to accept blocks of transmission values and generate blocks of modulation values in dependence upon at least the blocks of transmission values, wherein the covariance inducing module is configured to transform the transmission values as a matrix multiplication by a matrix proportional to H−
1/2, where a covariance of noise introduced by the continuous channel into the demodulation values is proportional to H; and
a modulation unit coupled to the covariance inducing module configured to accept the blocks of the modulation values and form a corresponding transmission signal for transmission over a continuous channel in dependence upon at least the blocks of modulation values and a signalling signal; and
a receiver comprising;
a demodulation unit configured to accept a received signal from the continuous channel, and generate blocks of demodulated values in dependence upon at least the received signal; and
an covariance—
intersymbol interference (ISI) reducing module configured to accept the blocks of demodulated values and form decoded values in dependence upon at least the blocks of demodulated values, each decoded value being an estimate of a transmission value;
wherein the covariance inducing and covariance—
ISI reducing modules are configured to apply to the transmission signal and remove from the received signal a predetermined intersymbol interference applied to a transmission established in dependence upon at least a multiplier factor K and a signal pulse characterized by at least a bandwidth B.
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Accused Products
Abstract
Cost, electronic circuitry limitations, and communication channel behavior yield communication systems with strict bandwidth constraints. Hence, maximally utilizing available bandwidth is crucial, for example in wireless networks, to supporting ever increasing numbers of users and their demands for increased data volumes, low latency, and high download speeds. Accordingly, it would be beneficial for such networks to support variable bandwidth allocations such that smaller frequency sub-bands are allocated to users, as their number increases, but the individual users/nodes insert more data-carrying signals in order to compensate for the loss of operating bandwidth arising from the accommodation of more users. It would further be beneficial for transmitters and receivers according to embodiments of such a network architecture to be based upon low cost design methodologies allowing their deployment within a wide range of applications including high volume, low cost consumer electronics for example.
50 Citations
22 Claims
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1. A communication system comprising:
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a transmitter comprising; a covariance inducing module configured to accept blocks of transmission values and generate blocks of modulation values in dependence upon at least the blocks of transmission values, wherein the covariance inducing module is configured to transform the transmission values as a matrix multiplication by a matrix proportional to H−
1/2, where a covariance of noise introduced by the continuous channel into the demodulation values is proportional to H; anda modulation unit coupled to the covariance inducing module configured to accept the blocks of the modulation values and form a corresponding transmission signal for transmission over a continuous channel in dependence upon at least the blocks of modulation values and a signalling signal; and a receiver comprising; a demodulation unit configured to accept a received signal from the continuous channel, and generate blocks of demodulated values in dependence upon at least the received signal; and an covariance—
intersymbol interference (ISI) reducing module configured to accept the blocks of demodulated values and form decoded values in dependence upon at least the blocks of demodulated values, each decoded value being an estimate of a transmission value;wherein the covariance inducing and covariance—
ISI reducing modules are configured to apply to the transmission signal and remove from the received signal a predetermined intersymbol interference applied to a transmission established in dependence upon at least a multiplier factor K and a signal pulse characterized by at least a bandwidth B. - View Dependent Claims (2, 3, 4, 5)
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6. A transmitter comprising:
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a covariance inducing module configured to accept blocks of transmission values and generate blocks of modulation values in dependence upon at least the blocks of transmission values, wherein the covariance inducing module is configured to transform the transmission values as a matrix multiplication by a matrix proportional to H−
1/2, where a covariance of noise introduced by the continuous channel into the demodulation values is proportional to H; anda modulation unit coupled to the covariance inducing module configured to accept the blocks of the modulation values and form a corresponding transmission signal for transmission over a continuous channel in dependence upon at least the blocks of modulation values and a signalling signal; wherein the covariance inducing module is configured to apply to the transmission signal a predetermined covariance established in dependence upon at least a multiplier factor K and a signal pulse characterized by at least a bandwidth B. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A receiver comprising:
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a network discovery module, the network discovery module establishing that the received signal comprises N messages broadcast to N users and that M other receivers have better noise than the receiver; a demodulation unit configured to accept a received signal from the continuous channel, and generate blocks of demodulated values in dependence upon at least the received signal; and a covariance—
ISI reducing module configured to accept the blocks of demodulated values and form decoded values in dependence upon at least the blocks of demodulated values, each decoded value being an estimate of a transmission value;
whereinthe covariance—
ISI reducing module performs iterative processing to decode N−
M messages in order to establish the message intended for that receiver and is configured to remove from the received signal a predetermined intersymbol interference applied to a transmission applied to a transmission channel coupled to the continuous channel, the predetermined intersymbol interference established in dependence upon at least a multiplier factor K and a signal pulse characterized by at least a bandwidth B. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A transmitter comprising:
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a covariance inducing module configured to accept blocks of transmission values and generate blocks of modulation values in dependence upon at least the blocks of transmission values, wherein the covariance inducing module is configured to transform the transmission values as a matrix multiplication by a matrix P, where P satisfies the equation P·
P†
=ES·
H−
1/K where P†
is the Hermitian transpose of P, ES represents the average expected squared norm of the transmission signal over a predetermined time period, H is a matrix defined such that each matrix element hij depends upon the degree of overlap between the modulation pulse for the ith modulation value in a block of modulation values to be transmitted and the jth modulation value in the block of modulation values to be transmitted, and K is a multiplier factor such that the covariance of noise introduced by the continuous channel into the demodulation values is proportional to H; anda modulation unit coupled to the covariance inducing module configured to accept the blocks of the modulation values and form a corresponding transmission signal for transmission over a continuous channel in dependence upon at least the blocks of modulation values and a signalling signal. - View Dependent Claims (21, 22)
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Specification