1. A method of generating transmit power control feedback for a power control channel that lacks both error coded data and known data comprising:
setting a target signal quality for power control of the power control channel that corresponds to a target power control command error rate, according to a defined signal-quality-to-command-error-rate mapping function;
receiving power control commands over the power control channel;
estimating a signal quality for the power control channel based on the received power control commands; and
generating transmit power control feedback for the power control channel by comparing the estimated signal quality to the target signal quality;
wherein setting the target signal quality comprises determining the target signal quality value by:
using the target power control command error rate to access a data lookup table embodying the defined signal-quality-to-command-error-rate mapping function; or
using the target power control command error rate as an input value to a polynomial function embodying the defined signal-quality-to-command-error-rate mapping function.
2. The method of claim 1, wherein estimating a signal quality for the power control channel comprises estimating a signal-to-interference ratio for the power control channel, and wherein the target signal quality comprises a target signal-to-interference ratio.
3. The method of claim 1, wherein the power control channel comprises a Fractional Dedicated Physical Channel (F-DPCH) in a Wideband Code Division Multiple Access (W-CDMA) communication network.
4. The method of claim 1, wherein said mapping function comprises an additive white Gaussian noise (AWGN) mapping, such that the signal-quality-to-command-error-rate mapping function is independent of channel conditions.
5. A power control circuit for use in a wireless communication device or system, said power control circuit being operative to generate transmit power control feedback for a power control channel that lacks both error coded data and known data, said power control circuit comprising:
one or more processing circuits configured to:
set a target signal quality for power control of the power control channel that corresponds to a target power control command error rate, according to a defined signal-quality-to-command-error-rate mapping function;
receive power control commands over the power control channel;
estimate a signal quality for the power control channel based on the received power control commands; and
generate transmit power control feedback for the power control channel by comparing the estimated signal quality to the target signal quality; and
a mapping circuit configured to:
determine the target signal quality value by using the target power control command error rate to access a data lookup table embodying the defined signal-quality-to-command-error-rate mapping function; or
determine the target signal quality value by using the target power control command error rate as an input value to a polynomial function embodying the defined signal-quality-to-command-error-rate mapping function.
6. The power control circuit of claim 5, wherein said mapping function comprises an additive white Gaussian noise (AWGN) mapping, such that the signal-quality-to-command-error-rate mapping function is independent of channel conditions.
7. A wireless communication device comprising a power control circuit configured to generate transmit power control feedback for a power control channel received by the wireless communication device, wherein the power control channel lacks both error coded data and known data, and the power control circuit is configured to:
set a target signal quality for power control of the power control channel that corresponds to a target power control command error rate, according to a defined signal-quality-to-command-error-rate mapping function;
receive power control commands over the power control channel;
estimate a signal quality for the power control channel based on the received power control commands; and
generate transmit power control feedback for the power control channel by comparing the estimated signal quality to the target signal quality;
wherein to set the target signal quality, the power control circuit is configured to determine the target signal quality by:
using the target power control command error rate to access a data lookup table embodying the defined signal-quality-to-command-error-rate mapping function; or
using the target power control command error rate as an input value to a polynomial function embodying the defined signal-quality-to-command-error-rate mapping function.
8. A non-transitory computer readable medium storing a computer program for generating transmit power control feedback for a power control channel that lacks both error coded data and known data, the computer program comprising:
program instructions to set a target signal quality for power control of the power control channel that corresponds to a target power control command error rate, according to a defined signal-quality-to-command-error-rate mapping function;
program instructions to receive power control commands over the power control channel;
program instructions to estimate a signal quality for the power control channel based on the received power control commands;
program instructions to generate transmit power control feedback for the power control channel by comparing the estimated signal quality to the target signal quality; and
program instructions to determine the target signal quality value by:
using the target power control command error rate to access a data lookup table embodying the defined signal-quality-to-command-error-rate mapping function; or
using the target power control command error rate as an input value to a polynomial function embodying the defined signal-quality-to-command-error-rate mapping function.
9. The non-transitory computer readable medium of claim 8, wherein the power control channel comprises a Fractional Dedicated Physical Channel (F-DPCH) in a Wideband Code Division Multiple Access (W-CDMA) communication network.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A cordless communication device having a handset unit and a base unit, comprising:
a transceiver, disposed in the handset unit, having a transmitter and a receiver,
wherein the handset unit transceiver includes:
at least one intermediate frequency (IF) filter adapted to filter a received audio signal to output an IF signal corresponding to the received audio signal
a quadrature detector adapted to input the IF signal and to output a base band signal corresponding to the received audio signal, the base band signal being a composite of a sinusoid with an overlay of a pulse amplitude modulated (PAM) signal including the received audio signal chopped at a predetermined frequency;
a high pass filter adapted to filter the base band signal to output a square wave pulse train identical to the PAM signal; and
a ringing oscillator adapted to generate a switching signal in synchronization with the square wave pulse train and to generate a 180 degrees out-of-phase version of the switching signal,
wherein the transmitter is turned on and off at a predetermined frequency by the switching signal and the receiver is turned on and off by the 180 degrees out-of-phase version of the switching signal, to ensure than the receiver is turned off when the transmitter is turned on.
2. The cordless communication device according to claim 1, further comprising:
a transceiver, disposed in the base unit, having a transmitter and a receiver,
wherein the base unit transceiver includes:
a compandor adapted to input an audio signal and to output a compressed audio signal having less amplitude variation than the audio signal;
a chopper adapted to input the compressed audio signal and to output the PAM signal including the audio signal chopped at the predetermined frequency;
a modulator adapted to be controlled by the PAM signal to output a modulated signal; and
a voltage controlled oscillator (VCO) adapted to be controlled by the modulated signal.
3. The cordless communication device according to claim 2, wherein the base unit transceiver further includes a low pass filter adapted to filter the base band signal to provide the sinusoid without the overlay of the PAM signal to the compandor.
4. The cordless communication device according to claim 1, wherein the handset transceiver further comprises:
a phase locked loop (PLL);
a reference oscillator adapted to provide a reference signal for the PLL; and
a fixed divider adapted to divide the reference signal by a fixed divisor to generate a reference audio signal chopped at the predetermined frequency.
5. The cordless communication device according to claim 4, wherein the handset unit transceiver further comprises:
a voltage controlled oscillator;
an Exclusive-Or gate adapted to compare the switching signal with a received switching signal to generate an error signal based upon a frequency difference therebetween; and
a resistor capacitor (RC) low pass filter adapted to integrate the error signal to provide the integrated error signal to said reference oscillator,
wherein said reference oscillator is further adapted to correct frequencies of PAM signals generated in the handset unit with respect to PAM signals generated in the base unit and to correct reference frequencies provided to PLLs so as to correct frequencies of the VCOs in the base unit and the handset unit.
6. A cordless communication device having a handset unit and a base unit, comprising:
a transceiver, disposed in the base unit, having a transmitter and a receiver,
wherein the base unit transceiver includes:
a compandor adapted to input an audio signal and to output a compressed audio signal having less amplitude variation than the audio signal;
a chopper adapted to input the compressed audio signal and to output a pulse amplitude modulated (PAM) signal including the audio signal chopped at a predetermined frequency;
a modulator adapted to be controlled by the PAM signal to output a modulated signal;
a voltage controlled oscillator (VCO) adapted to be controlled by the modulated signal.
7. The cordless communication device according to claim 6, further comprising:
a transceiver, disposed in the handset unit, having a transmitter and a receiver,
wherein the handset unit transceiver includes:
at least one intermediate frequency (IF) filter adapted to filter a received audio signal to output an IF signal corresponding to the received audio signal
a quadrature detector adapted to input the IF signal and to output a base band signal corresponding to the received audio signal, the base band signal being a composite of a sinusoid with an overlay of a PAM signal including the received audio signal chopped at the predetermined frequency;
a high pass filter adapted to filter the base band signal to output a square wave pulse train identical to the PAM signal of the base band signal; and
a ringing oscillator adapted to generate a switching signal in synchronization with the square wave pulse train and to generate a 180 degrees out-of-phase version of the switching signal,
wherein the transmitter is turned on and off at a predetermined frequency by the switching signal and the receiver is turned on and off by the 180 degrees out-of-phase version of the switching signal, to ensure than the receiver is turned off when the transmitter is turned on.
8. The cordless communication device according to claim 6, wherein the base unit transceiver further includes a low pass filter adapted to filter the base band signal to provide the sinusoid without the overlay of the PAM signal to the compandor.
9. The cordless communication device according to claim 6, wherein the handset transceiver further comprises:
a phase locked loop (PLL);
a reference oscillator adapted to provide a reference signal for the PLL;
a fixed divider adapted to divide the reference signal by a fixed divisor to generate a reference audio signal chopped at the predetermined frequency.
10. The cordless communication device according to claim 9, wherein the handset unit transceiver further comprises:
an Exclusive-Or gate adapted to compare the switching signal with a received switching signal to generate an error signal based upon a frequency difference therebetween; and
a resistor capacitor (RC) low pass filter adapted to integrate the error signal to provide the integrated error signal to said reference oscillator,
wherein said reference oscillator is further adapted to correct frequencies of PAM signals generated in the handset unit with respect to PAM signals generated in the base unit and to correct reference frequencies provided to PLLs so as to correct frequencies of the VCOs in the base unit and the handset unit.