Dual-mode wireless and wired power line communications

• US 7,269,403 B1
• Filed: 06/03/2004
• Issued: 09/11/2007
• Est. Priority Date: 06/03/2004
• Status: Active Grant

• Current Assignee: MIMO Research, LLC
• Original Assignee: George J. Miao
• Inventors: Miao, George J.
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Nguyen, Huy D
• Application Number:
  US10/859,777
• Time in Patent Office: 1,195 Days
• Field of Search: 455/402, 455/11.1, 455/17, 455/129, 455/552.1, 709/249
• US Class Current: 455/402
• CPC Class Codes: H04B 2203/5441 Wireless systems or telephone
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 3/237 using two adaptive filters, e.g. for near end and for end echo cancelling
• CPC Class Codes: H04B 3/542 the information being in digital form

Abstract

This invention presents a dual-mode wireless/wired power line communications that is used to carry signals with variable transmission data rates from 31.0 Mbps to 173.6 Mbps over a power line cable. The dual-mode wireless/wired power line communications can be seamlessly used either to connect with any wired devices over cable lines directly or to connect with any wireless devices without wires. This enables multiuser to access high-speed Internet over the wall power sockets, and to provide distribution of data and multiple data streams, such as voice over IP, audio and video, HDTV, throughout the home, office, hotel room or airport waiting area, and so on. On the other hand, using the dual-mode wireless/wired power line communications modem is to utilize the availability of an existing infrastructure of wires and wall outlets, thereby eliminating the requirements of new installation of power line cables.

Claims

1. A dual-mode wireless and wired power line communications system comprising:

a MIMO-based wireless modem;

a power line communications modem;

a micro-controller coupled to both of said MIMO-based wireless modem and said power line communications modem;

said MIMO-based wireless modem coupled to N antennas and coupled to said power line communications modem, where N is an integer and greater than 1;

said power line communications modem connected to a power line central modem in a local transformer station over a power line cable; and

said power line central modem in a local transformer station coupled to a power line communications backbone gateway.

2. The dual-mode wireless and wired power line communications system of claim 1 wherein said MIMO-based wireless modem can be one of type modems, including a MIMO-based WLAN, a MIMO-based UWB, any combinations of dual/triple-mode WLAN, any combinations of WLAN and UWB modem, a wireless phone, or a portable wireless device.

3. The dual-mode wireless and wired power line communications system of claim 1 wherein said power line communications modem further contains:

a DSP/communication transmitter processor;

a Digital shaped transmitter filter;

a dual-mode adaptive bit loading approach;

a time- and frequency-domain echo cancellation;

a DSP/communication receiver processor;

a channel estimator;

a digital receiver filter; and

an analog transmitter and receiver unit.

4. The dual-mode wireless and wired power line communications system of claim 3 wherein said DSP/communication transmitter processor further includes:

a user-k ID code mask coupled to an adjustable pseudorandom encrypting generator that is coupled to a digital spreader;

a variable-size S/P converter coupled to a 2-D trellis encoder and mapping that is coupled to a variable block interleaver;

an IFFT coupled to cyclic extension that is coupled to P/S converter; and

a variable-size control.

5. The dual-mode wireless and wired power line communications system of claim 4 wherein said adjustable pseudorandom encrypting generator produces a unique pseudorandom sequence of the user-k with adjustable length, which the unique pseudorandom sequence is orthogonal to other pseudorandom sequences.

6. The dual-mode wireless and wired power line communications system of claim 4 wherein said 2-D trellis encoder and mapping further comprises:

B bit inputs in parallel, where B is an integer;

a convolution encoder (n, k, m) with k-input, n-output linear sequential circuit with input memory of m;

a modulation mapping;

a QPSK table;

a 16-QAM table;

a 32-QAM table;

a 64-QAM table;

a 128-QAM table; and

a selector.

7. The dual-mode wireless and wired power line communications system of claim 6 wherein said 2-D trellis encoder and mapping can produce different encoding and modulation mapping in terms of QPSK, QAM and other modulations.

8. The dual-mode wireless and wired power line communications system of claim 6 wherein said convolution encoder can be one of types, including (2, 1, m), (3, 2, m), (4, 3, m) or (5, 4, m), where m is an integer and input memory.

9. The dual-mode wireless and wired power line communications system of claim 4 wherein the IFFT has 512-point pins including:

12 Nulls in the pin #0 (DC) and pins from #251 to #260 with zero value;

coefficients of 1 to 250 mapped to the pins #1 to #250;

the coefficients of 250 to 1 passed through a complex conjugate and copied into pins #261 to #511;

496 subcarriers for transmitting data; and

4 subcarriers for pilots that are BPSK modulated by a pseudo binary sequence.

10. The dual-mode wireless and wired power line communications system of claim 4 wherein the variable-size control provides adjustable parallel-size information to the variable-size S/P converter, the 2-D trellis encoder and mapping, and the variable block interleaver.

11. The dual-mode wireless and wired power line communications system of claim 3 wherein the dual-mode adaptive bit loading approach has two operation modes, including a constant bits assignment and an adaptive bits loading assignment.

12. The dual-mode wireless and wired power line communications system of claim 11 wherein the adaptive bits loading assignment further includes:

performing channel estimation;

estimating channel response and noise variance;

calculating total SNR and SNR_N, where SNR_N is the Nth subchannel SNR;

determining a difference between SNR and SNR_T, where SNR_T is a threshold;

assigning number of bits per subchannel;

getting maximum bits for all the subchannels; and

sending bits loading information to a receiver.

13. The dual-mode wireless and wired power line communications system of claim 3 wherein the time- and frequency-domain echo cancellation has four operation modes including:

turning on both of frequency-domain echo canceller and time-domain echo canceller;

turning on the frequency-domain echo canceller only;

turning on the time-domain echo canceller only;

or

turning off both of the frequency-domain echo canceller and time-domain echo canceller.

14. The dual-mode wireless and wired power line communications system of claim 3 wherein the DSP/communication receiver processor further comprises:

a TEQ coupled to a S/P, which is coupled to a removing cyclic extension followed by a FFT;

an adaptive bit information per carrier coupled to said FFT that is coupled to a subtractor;

said subtractor coupled to a FEQ that is coupled to a variable block deinterleaver followed by a demapping and decoder;

said demapping and decoder coupled to a variable-size P/S converter followed by a digital despreader; and

a user-k ID mask key coupled to an adjustable pseudorandom decrypting generator, which provides a unique pseudorandom sequence for said digital despreader.

15. A dual-mode wireless and wired power line communications system has:

N antennas coupled to a residential dual-mode wireless and wired power line basestation that is coupled to a power line central modem followed by a power communications backbone gateway, where N is an integer;

said residential dual-mode wireless and wired power line basestation further including a MIMO-based wireless modem, a microcontroller, and a power line communications modem;

said MIMO-based wireless modem coupled to said microcontroller followed by said power line communications modem, which also is connected with said MIMO-based wireless modem;

said power line communications modem coupled to said power line central modem; and

said power line communications modem having M interfaces that are used to connect with a HDTV, a computer, and/or user devices, where M is an integer.

16. A dual-mode wireless and wired power line communications system of claim 15 wherein said power line communications modem transmits and receives scalability data rates.

17. A dual-mode wireless and wired power line communications system of claim 15 wherein said power line communications modem further including:

a digital interface coupled to a communication transmitter and a communication receiver;

a dual-mode time-domain and frequency-domain echo cancellation coupled to said communication transmitter and said communication receiver;

said communication transmitter coupled to a digital shaped transmitter filter followed by an analog transmitter and receiver unit;

a dual-mode adaptive bit loading approach coupled to said communication transmitter;

said analog transmitter and receiver unit coupled to a digital receiver filter;

said digital receiver filter coupled to a channel estimator and said communication receiver; and

said channel estimator coupled to said communication receiver.

18. A dual-mode wireless and wired power line communications system of claim 17 wherein said dual-mode adaptive bit loading approach uses storing instructions to selectively set for a constant bits loading mode or an adaptive bits loading mode.

19. A dual-mode wireless and wired power line communications system of claim 17 wherein said dual-mode time-domain and frequency-domain echo cancellation is programmable to operate at different modes.

20. A dual-mode wireless and wired power line communications system of claim 15 wherein said power line communications modem can be used to delivery Internet television services at user devices.