Method and transmitter for constant envelope phase modulation and demodulation
AssigneeNanjing Zgmicro Company Limited
InventorBin Xu
Life of this patent
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Abstract
Techniques for constant envelope phase modulation and demodulation of a wireless signal such as BLE are described. The method comprises: dividing a binary data stream to be transmitted into a plurality of groups of binary data according to a predetermined phase modulation mode, each group of binary data comprising a plurality of bits; mapping the binary data stream into a plurality of phase symbols, wherein each group of binary data is mapped into one phase symbol; modulating a phase sequence composed of the phase symbols into a phase signal using a phase waveform obtained by integrating a predetermined pulse function; and converting the phase signal into two baseband signals by means of a cosine function and a sine function respectively.
Claims20
A method for constant envelope phase modulation of BLE, comprising:
- dividing a binary data stream to be transmitted into a plurality of groups of binary data according to a predetermined phase modulation mode, each of the groups of binary data including a plurality of bits;
- mapping the binary data stream into a plurality of phase symbols, wherein the each of the group of binary data is mapped into one of the phase symbols;
- modulating a phase sequence including the phase symbols into a phase signal φ(t) using a phase waveform p(t) obtained by integrating a predetermined pulse function y(t), wherein a mathematical expression of the phase waveform p(t) is:
- p
-
- (
- t
- )
- =
- {
- 0
- t
- <
- 0
- ∫
- 0
- t
- y
-
- (
- x
- )
-
- dx
- ∫
- 0
- T
- y
-
- (
- x
- )
-
- dx
- 0
- ≤
- t
- ≤
- T
- 1
- t
- >
- T
- ;
- and
- converting the phase signal into two baseband signals by means of a cosine function and a sine function respectively.
A transmitter for constant envelope phase modulation of BLE, comprising:
- a transmitting data processor configured to provide a binary data stream;
- a phase mapper configured to divide the binary data stream into a plurality of groups of binary data, and map the groups of binary data into a plurality of phase symbols;
- a phase waveform generator configured to generate a phase waveform p(t) by integrating a predetermined pulse function y(t), wherein a mathematical expression of the phase waveform p(t) is:
- p
-
- (
- t
- )
- =
- {
- 0
- t
- <
- 0
- ∫
- 0
- t
- y
-
- (
- x
- )
-
- dx
- ∫
- 0
- T
- y
-
- (
- x
- )
-
- dx
- 0
- ≤
- t
- ≤
- T
- 1
- t
- >
- T
- ;
- a phase signal generator configured to modulate the phase sequence into a phase signal by using the phase waveform;
- a baseband signal generator configured to convert the phase signal into two baseband signals;
- an RF signal generator configured to modulate the two baseband signals into two branching RF signals respectively, combine the two branching RF signals to generate a combined RF signal and amplify the combined RF signal by a power amplifier;
- and
- an antenna configured to transmit the amplified RF signal.
A transmitter for constant envelope phase modulation of BLE, comprising:
- a transmitting data processor configured to provide a binary data stream;
- a phase mapper configured to divide the binary data stream into a plurality of groups of binary data, and map the groups of binary data into a plurality of phase symbols;
- a digital phase waveform generation unit configured to generate a digital phase waveform p(t) by integrating a predetermined pulse function y(t), wherein a mathematical expression of the digital phase waveform p(t) is:
- p
-
- (
- t
- )
- =
- {
- 0
- t
- <
- 0
- ∫
- 0
- t
- y
-
- (
- x
- )
-
- dx
- ∫
- 0
- T
- y
-
- (
- x
- )
-
- dx
- 0
- ≤
- t
- ≤
- T
- 1
- t
- >
- T
- ;
- a digital phase signal generator configured to modulate the phase sequence into a digital phase signal by using the digital phase waveform, or generate the digital phase signal based on a pre-stored waveform data;
- a digital baseband signal generator configured to convert the digital phase signal into two digital baseband signals;
- a digital-to-analog converter configured to convert the two digital baseband signals into two analog baseband signals respectively;
- an RF signal generator configured to modulate the two analog baseband signals into two branching RF signals respectively, combine the two branching RF signals to generate a combined RF signal and amplify the combined RF signal by a power amplifier;
- and
- an antenna configured to transmit the amplified RF signal.
Dependencies are inferred from the claim text.