COMMUNICATION DEVICE AND METHOD

• US 20080144628A1
• Filed: 05/21/2007
• Published: 06/19/2008
• Est. Priority Date: 12/15/2006
• Status: Active Grant

• Current Assignee: Xueshan Technologies Inc. (Wi-LAN Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Tsai, Shang-Ho, Cheng, Po-Yuen, Yin, Shih-Chung, Huang, Chung-Yen
• Granted Patent: US 7,697,533 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters

Abstract

A communication device and a method of processing input data. The communication device, processing input data constituting at least one of data packet comprises a detection unit, an Automatic Gain Controller (AGC), a signal processor, a demodulator, a pre-detection module, and a Baseband module. The detection unit receives the input data to perform the packet detection. The Automatic Gain Controller, coupled to the detection unit, generates an adjusted data and a gain control parameter once packet is detected. The signal processor, coupled to the AGC, performs the data signal processing includes at least one of analog to digital transformation processing, radio frequency processing and baseband processing, and detects at least one of the desired signal, noise and interference. The demodulator, coupled to the signal processor, demodulates the processed data into a processed data according to at least one processing function of noise reduction, interference reduction, and signal compensation. The pre-detection module, coupled to the demodulator, determines whether a potential error has occurred in the demodulated input data by a pre-detection method prior completing retrieval of the data packet for performing a packet-based error check sequence, and performs a selection to decide whether the components need to be terminated and which of the components need to be terminated if there is a potential error occurred on the demodulated input data. The Baseband module, coupled to the demodulator, performs a packet-based error check on the data packet upon completing retrieval of the data packet if there is no potential error occurred on the demodulated input data.

Claims

1. A method of processing input data constituting at least one of data packet in a receiver, comprising:

receiving the input data to perform the packet detection process;

generating an adjusted data and an gain control parameter once packet is detected;

performing signal processing and demodulation to transform the adjusted data into a demodulated data according to at least one processing function of noise reduction, interference reduction, and signal compensation, wherein said signal processing and demodulation perform the data signal processing includes at least one of analog to digital transformation processing, radio frequency processing and baseband processing, wherein signal processing and demodulation further include detecting at least one of the desired signal, noise and interference;

determining whether a potential error has occurred in the demodulated input data by a pre-detection method prior of completing retrieval of the data packet for performing a packet-based error check sequence;

performing a selection to decide whether the components need to be terminated and which of the components need to be terminated if there is a potential error occurred on the demodulated input data; and

performing a packet-based error check on the data packet upon completing retrieval of the data packet if there is no potential error occurred on the demodulated input data;

2. The method of claim 1, wherein the pre-detection method comprises:

estimating energies of the input data in at least one predetermined time interval;

calculating energy difference between two time intervals; and

generating an error indication signal based on the energy difference.

3. The method of claim 2, wherein generating the error based on the energy difference comprises:

calculating an error duration if the energy difference exceeds an energy threshold; and

generating the error indication signal if the error duration exceeds a duration threshold.

4. The method of claim 1, wherein the pre-detection method further comprises:

providing a known preamble;

determining a received preamble in the demodulated input data; and

generating an error indication signal if the received preamble is not the known preamble.

5. The method of claim 1, wherein the pre-detection method comprises:

retrieving a data symbol in the demodulated input data;

providing an expected data symbol based on the data symbol;

calculating an error distance between the expected data symbol and the data symbol; and

generating an error indication signal based on the error distance.

6. The method of claim 5, wherein generating the error indication signal based on the error distance comprises:

increasing an error count if the error distance exceeds a distance threshold; and

generating the error indication signal if the error count exceeds a count threshold.

7. The method of claim 5, wherein the expected data symbol is an expected pilot symbol.

8. The method of claim 1, wherein the pre-detection method comprises:

performing Viterbi decoding on the demodulated input data to obtain an optimal path metrics;

calculating a metric ratio of maximum to minimum of the optimal path metrics;

generating an error indication signal if the metric ratio exceeds a ratio threshold.

9. The method of claim 1, wherein the selection to decide whether the components need to be terminated and which of the components need to be terminated, said components need to be terminated comprises Radio Frequency (RF), Analog-to-Digital Converter (ADC), and Baseband components;

the period of time for termination is the time of waiting the completion of the data packet has fully received.

10. The method of claim 1, wherein the selection to decide whether the components need to be terminated and which of the components need to be terminated, said components need to be terminated comprises the Baseband component;

wherein the packet detection is continued to be applied to the packet, which has indicated as a potential error.

11. The method of claim 1, wherein the packet-based error check is Frame Check Sequence (FCS).

12. A communication device, processing input data constituting at least one of data packet, comprising:

a detection unit receiving the input data to perform the packet detection;

an Automatic Gain Controller (AGC), coupled to the detection unit, generating an adjusted data and an gain control parameter once packet is detected;

a signal processor, coupled to the AGC, performing the data signal processing includes at least one of analog to digital transformation processing, radio frequency processing and baseband processing, and detecting at least one of the desired signal, noise and interference;

a demodulator, coupled to the signal processor, demodulating the processed data into a processed data according to at least one processing function of noise reduction, interference reduction, and signal compensation;

a pre-detection module, coupled to the demodulator, determining whether a potential error has occurred in the demodulated input data by a pre-detection method prior of completing retrieval of the data packet for performing a packet-based error check sequence, and performing a selection to decide whether the components need to be terminated and which of the components need to be terminated if there is the potential error occurred on the demodulated input data; and

a Baseband module, coupled to the demodulator, performing a packet-based error check on the data packet upon completing retrieval of the data packet if there is no potential error occurred on the demodulated input data.

13. The communication device of claim 12, wherein the pre-detection module estimates energies of the input data in at least one predetermined time interval, calculates energy difference between two time intervals, and generates an error indication signal based on the energy difference.

14. The communication device of claim 13, wherein the pre-detection module calculates an error duration if the energy difference exceeds an energy threshold, and generates the error indication signal if the error duration exceeds a duration threshold.

15. The communication device of claim 12, wherein the pre-detection module provides a known preamble, determines a received preamble in the demodulated input data, and generates an error indication signal if the received preamble is not the known preamble.

16. The communication device of claim 12, wherein the pre-detection module retrieves a data symbol in the demodulated input data, provides an expected data symbol based on the data symbol, calculates an error distance between the expected data symbol and the data symbol, and generates an error indication signal based on the error distance.

17. The communication device of claim 16, wherein the pre-detection module increases an error count if the error distance exceeds a distance threshold, and generates the error indication signal if the error count exceeds a count threshold.

18. The communication device of claim 16, wherein the expected data symbol is an expected pilot symbol.

19. The communication device of claim 12, wherein the pre-detection module performs Viterbi decoding on the demodulated input data to obtain an optimal path metrics, calculates a metric ratio of maximum to minimum of the optimal path metrics, and generates an error indication signal if the metric ratio exceeds a ratio threshold.

20. The communication device of claim 12, wherein the pre-detection module decide whether the components need to be terminated and which of the components need to be terminated, said components need to be terminated comprises Radio Frequency (RF), Analog-to-Digital Converter (ADC), and Baseband components;

the period of time for termination is the time of waiting the completion of the data packet has fully received.

21. The communication device of claim 12, wherein the pre-detection module decide whether the components need to be terminated and which of the components need to be terminated, said components need to be terminated comprises the Baseband component;

wherein the packet detection is continued to be applied to the packet, which has indicated as a potential error.