Adaptive non-linear model for highly-spectrally-efficient communications

• US 9,252,822 B2
• Filed: 08/29/2014
• Issued: 02/02/2016
• Est. Priority Date: 06/20/2012
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: MagnaCom, Ltd. (Broadcom, Inc.)
• Inventors: Eliaz, Amir
• Primary Examiner(s): HA, DAC V
• Application Number:
  US14/472,559
• Publication Number:
  US 20150055722A1
• Time in Patent Office: 522 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/10 Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/16 Circuits
• CPC Class Codes: H04B 1/709 Correlator structure
• CPC Class Codes: H04B 17/0085 using test signal generators
• CPC Class Codes: H04B 17/15 Performance testing
• CPC Class Codes: H04B 17/29 Performance testing
• CPC Class Codes: H04B 2001/0416 having gain or transmission power control
• CPC Class Codes: H04L 1/0036 arrangements specific to the receiver
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0048 in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder for spatial equalizer H04L25/03286
• CPC Class Codes: H04L 1/005 Iterative decoding, including iteration between signal detection and decoding operation
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/203 Details of error rate determination, e.g. BER, FER or WER
• CPC Class Codes: H04L 1/206 for modulated signals
• CPC Class Codes: H04L 2025/03369 Partial response
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/0236 using estimation of the other symbols
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• CPC Class Codes: H04L 25/03038 : with a non-recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/03057 : with a recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/03178 : Arrangements involving sequence estimation techniques
• CPC Class Codes: H04L 25/03197 : methods of calculation involving metrics
• CPC Class Codes: H04L 25/03267 : with decision feedback equalisers
• CPC Class Codes: H04L 25/0328 : with interference cancellation circuitry adaptations for interference cancellation within a sequence estimator H04L25/03305; interference related aspects of direct sequence spread spectrum H04B1/7097; interference related aspects of frequency hopping spread spectrum H04B1/715; see also H04B1/10
• CPC Class Codes: H04L 25/03305 : Joint sequence estimation and interference removal joint detection of several desired signals H04L25/03331
• CPC Class Codes: H04L 25/03318 : Provision of soft decisions
• CPC Class Codes: H04L 25/03337 : Arrangements involving per-survivor processing
• CPC Class Codes: H04L 25/03343 : Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03834 : using pulse shaping
• CPC Class Codes: H04L 25/03885 : adaptive
• CPC Class Codes: H04L 25/03949 : equalizer selection or adaptation based on feedback multiple signaling inclusive of a precoding command for adapting the transmitter H04L1/0031; feedback for transmit diversity systems H04B7/0619; selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 25/08 : Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
• CPC Class Codes: H04L 27/00 : Modulated-carrier systems
• CPC Class Codes: H04L 27/01 : Equalisers baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005
• CPC Class Codes: H04L 27/02 : Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/04 : Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/2278 : using correlation techniques, e.g. for spread spectrum signals
• CPC Class Codes: H04L 27/36 : Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/366 : Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
• CPC Class Codes: H04L 27/368 : adaptive predistortion
• CPC Class Codes: H04L 27/38 : Demodulator circuits; Receiver circuits
• CPC Class Codes: H04L 7/0058 : detection of error based on equalizer tap values
• CPC Class Codes: H04L 7/0087 : Preprocessing of received signal for synchronisation, e.g. by code conversion, pulse generation or edge detection
• CPC Class Codes: H04L 7/02 : Speed or phase control by the received code signals, the signals containing no special synchronisation information H04L7/0075 takes precedence
• CPC Class Codes: H04L 7/042 : Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

Abstract

A receiver may be operable to generate estimates of transmitted symbols using a sequence estimation process that may incorporate a non-linear model. The non-linear model may be adapted by the receiver based on particular communication information that may be indicative of non-linearity experienced by the transmitted symbols. The receiver may generate a reconstructed signal from the estimates of the transmitted symbols. The receiver may adapt the non-linear model based on values of an error signal generated from the reconstructed signal, and the values of the error signal may be generated from a portion of the generated estimates that may correspond to known symbols and/or information symbols. The values of the error signal corresponding to the known symbols may be given more weight in an adaptation algorithm, and the values of the error signal corresponding to the information symbols may be given less weight in the adaptation algorithm.

Claims

1. A receiver comprising:

a nonlinearity modeling circuit operable to generate a model of nonlinear distortion introduced by a transmitter of a signal received by said receiver, wherein said model of nonlinear distortion is operable to be adapted during operation of said receiver; and

a sequence estimation circuit operable to;

generate transmitted symbol decisions for said received signal through comparison of said received signal to a reference signal generated using said model of nonlinear distortion introduced by said transmitter; and

generate a feedback signal through application of said model of nonlinear distortion introduced by said transmitter to said generated transmitted symbol decisions.

2. The receiver of claim 1, wherein adaptation of said model of nonlinear distortion introduced by a transmitter is based on said feedback signal.

3. The receiver of claim 1, wherein adaptation of said model of nonlinear distortion introduced by said transmitter is based on an indication of transmit power used by said transmitter.

4. The receiver of claim 1, wherein adaptation of said model of nonlinear distortion introduced by said transmitter is based on an order of modulation used by said transmitter for transmission of said received signal.

5. The receiver of claim 1, wherein adaptation of said model of nonlinear distortion introduced by said transmitter is based on strength at which said received signal is received.

6. The receiver of claim 1, wherein adaptation of said model of nonlinear distortion introduced by said transmitter is based on frequency of said received signal.

7. A receiver comprising:

a nonlinearity modeling circuit operable to generate a model of nonlinear distortion introduced by a transmitter of a signal received by said receiver, wherein;

said model of nonlinear distortion is operable to be adapted during operation of said receiver; and

adaptation of said model of nonlinear distortion introduced by said transmitter is based on control traffic communicated by said transmitter; and

a sequence estimation circuit operable to;

generate transmitted symbol decisions for said received signal through comparison of said received signal to a reference signal generated using said model of nonlinear distortion introduced by said transmitter.

8. A receiver comprising:

a nonlinearity modeling circuit operable to generate a model of nonlinear distortion introduced by a transmitter of a signal received by said receiver, wherein;

said model of nonlinear distortion is operable to be adapted during operation of said receiver; and

adaptation of said model of nonlinear distortion introduced by said transmitter is based on a performance indicator measured by said receiver for said received signal; and

a sequence estimation circuit operable to;

generate transmitted symbol decisions for said received signal through comparison of said received signal to a reference signal generated using said model of nonlinear distortion introduced by said transmitter.

9. A receiver comprising:

a nonlinearity modeling circuit operable to generate a model of nonlinear distortion introduced by a transmitter of a signal received by said receiver, wherein;

said model of nonlinear distortion is operable to be adapted during operation of said receiver; and

adaptation of said model of nonlinear distortion introduced by said transmitter is based on one or both of pilot symbols and preamble symbols of said received signal; and

a sequence estimation circuit operable to;

generate transmitted symbol decisions for said received signal through comparison of said received signal to a reference signal generated using said model of nonlinear distortion introduced by said transmitter.

10. A receiver comprising:

front-end circuitry operable to receive a signal via a channel, wherein said received signal is a result of a transmitted sequence of symbols;

nonlinearity modeling circuitry operable to;

generate a model of nonlinear distortion experienced by said received signal; and

adjust said model of nonlinear distortion during reception of said received signal; and

sequence estimation circuitry operable to;

generate a candidate sequence of symbols;

distort, using said model of nonlinear distortion, said candidate sequence of symbols, said distortion of said candidate sequence of symbols resulting in a reference signal; and

determine whether said candidate sequence of symbols is a likely match to said transmitted sequence of symbols based on said reference signal.

11. The receiver of claim 10, wherein said sequence estimation circuit is operable to generate a feedback signal through distortion of a generated symbol decision based on said model of nonlinear distortion.

12. The receiver of claim 11, wherein said adjustment of said model of nonlinear distortion is based on said feedback signal.

13. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on an indication of transmit power used by said transmitter.

14. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on an order of modulation used by said transmitter for transmission of said received signal.

15. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on strength at which said received signal is received.

16. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on control traffic communicated by said transmitter.

17. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on a performance indicator measured by said receiver for said received signal.

18. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on one or both of pilot symbols and preamble symbols of said received signal.

19. The receiver of claim 10, wherein said adjustment of said model of nonlinear distortion is based on frequency of said received signal.