Wireless device and method in the wireless device

A transmitter, comprising:

• an analog-to-digital converter circuit configured to translate an analog audio signal into a digital Pulse-Code Modulation (PCM) format audio signal;
• an audio signal compressor circuit configured to compress the PCM format audio signal into a coded bit stream with a modified Adaptive differential Pulse-code Modulation (ADPCM) algorithm;
• a framing circuit configured to packetize the coded bit stream into a 1.125 ms frame data by adding a preamble, a signaling field, a data field, and a cyclic redundancy check field to the coded bit stream;
• a scrambler circuit configured to scramble the frame data with an ID number;
• a modulator circuit configured to generate a modulated signal by modulating the scrambled frame data with a predetermined modulation scheme;
• a transmitter circuit configured to transmit the modulated signal;
• wherein the predetermined modulation scheme comprises π/4-DPSK or QPSK modulation scheme with 204.8 kHz symbol rate.

A receiver, comprising:

• a receiver circuit configured to receive a signal;
• a demodulator circuit configured to generate a demodulated signal by demodulating the signal with a predetermined demodulation scheme;
• a de-scrambler circuit configured to de-scramble the demodulated signal with an ID number;
• a de-framing circuit configured to de-packetize the de-scrambled signal into coded bit stream by removing a preamble, a signaling field, a data field, and a cyclic redundancy check field from the de-scrambled signal;
• an audio signal decompressor circuit configured to decompress the coded bit stream into a PCM format audio signal using a modified Adaptive differential Pulse-code Modulation (ADPCM) algorithm;
• a digital-to-analog converter circuit configured to translate the PCM format audio signal into analog audio signal;
• wherein the predetermined modulation scheme comprises π/4-DPSK or QPSK modulation scheme with 204.8 kHz symbol rate.

A receiver, comprising:

• a receiving circuit configured to receive a signal;
• a demodulator circuit configured to generate a demodulated signal by demodulating the signal with a predetermined demodulation scheme;
• a de-scrambler circuit configured to de-scramble the demodulated signal with an ID number;
• a de-framing circuit configured to de-packetize the de-scrambled signal into coded bit stream by removing a preamble, a signaling field, a data field, and a cyclic redundancy check field from the de-scrambled signal;
• an audio signal decompressor circuit configured to decompress the coded bit stream into a PCM format audio signal using a modified Adaptive differential Pulse-code Modulation (ADPCM) algorithm;
• a digital-to-analog converter circuit configured to translate the PCM format audio signal into analog audio signal;
• wherein a sample rate of the digital PCM format audio signal varies from 28 kHz to 48 kHz, Effective Number Of Bits of the digital PCM format audio signal is greater than 16 bit, and the coded bit stream has a bit rate of 336 kbps.

A method in a transmitter, comprising:

• translating, by an analog-to-digital converter, an analog audio signal into a digital Pulse-Code Modulation (PCM) format audio signal;
• compressing, by an audio signal compressor, the PCM format audio signal into a coded bit stream with a modified Adaptive differential Pulse-code Modulation (ADPCM) algorithm;
• packetizing, by a framer, the coded bit stream into a 1.125 ms frame data by adding a preamble, a signaling field, a data field, and a cyclic redundancy check field to the coded bit stream;
• scrambling, by a scrambler, the frame data with an ID number;
• generating, by a modulator, a modulated signal by modulating the scrambled frame data with a predetermined modulation scheme;
• and
• transmitting, by a transmitting unit, the modulated signal;
• and
• sending, by a controller, digital ADPCM format audio signal at least 189 symbols per frame.

A method in a receiver, comprising:

• receiving, by a receiving unit, a signal;
• Generating, by a demodulator, a demodulated signal by demodulating the signal with a predetermined demodulation scheme;
• de-scrambling, by a de-scrambler, the demodulated signal with an ID number;
• de-packetizing, by a de-framer, the de-scrambled signal into coded bit stream by removing a preamble, a signaling field, a data field, and a cyclic redundancy check field from the de-scrambled signal;
• decompressing, by an audio signal decompressor, the coded bit stream into a PCM format audio signal using a modified Adaptive differential Pulse-code Modulation (ADPCM) algorithm;
• translating, by a digital-to-analog converter, the PCM format audio signal into analog audio signal;
• wherein the predetermined modulation scheme comprises π/4-DPSK or QPSK modulation scheme with 204.8 kHz symbol rate.