WIRELESS BACKHAUL COMMUNICATION

• US 20130185617A1
• Filed: 01/14/2013
• Published: 07/18/2013
• Est. Priority Date: 01/12/2012
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: ROH, June Chul, HOSUR, Srinath, BERTRAND, Pierre, DABAK, Anand
• Application Number:
  US13/740,729
• Publication Number:
  US 20130185617A1
• Time in Patent Office: Days
• US Class Current: 714/800
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/001 applied to control information
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 27/2605 Symbol extensions, e.g. Zero Tail, Unique Word [UW]
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor

Abstract

A method for wireless backhaul communication comprising receiving, by a wireless backhaul transmitter, a data stream in a bit format and generating, by the wireless backhaul transmitter using a single-carrier block transmission scheme, a radio frame to include a plurality of physical data channel (PDCH) blocks, a pilot signal (PS) block and a physical control channel (PCCH) block with each block type pre-appended with a cyclic prefix (CP). A length of the PS block in symbols, a length of the PCCH block in symbols and a length of the PDCH block in symbols is determined by a frequency band, a bandwidth, and a channel condition. The wireless backhaul transmitter then transmits the radio frame.

Claims

1. A method for wireless backhaul communication, comprising:

receiving, by a wireless backhaul transmitter, a data stream in a bit format;

generating, by the wireless backhaul transmitter using a single-carrier block transmission scheme, a radio frame to include a plurality of physical data channel (PDCH) blocks, a pilot signal (PS) block and a physical control channel (PCCH) block with each block type pre-appended with a cyclic prefix (CP), wherein a length of the PS block in symbols, a length of the PCCH block in symbols and a length of the PDCH block in symbols is determined by a frequency band, a bandwidth, and a channel condition; and

transmitting the radio frame.

2. The method of claim 1, wherein the CP is a copy of the last N_CP symbols of the corresponding block type to which the CP is pre-appended.

3. The method of claim 1, wherein the length of the PCCH block in symbols is N_CP+N_FFT/2ⁿ symbols in length, where n is any positive integer greater than or equal to zero.

4. The method of claim 1, wherein the CP is replaced with a unique word of a known sequence.

6. The system of claim 4, wherein the CP is a copy of the last N_CP symbols of the corresponding PDCH block, where each PDCH block is N_FFT symbols in length.

7. The system of claim 4, wherein the digital radio frame further includes a pilot signal (PS) block pre-appended with a CP so that the PS block is N_CP+N_FFT symbols in length and a physical control channel (PCCH) block pre-appended with a CP so that the PCCH block is N_CP+N_FFT symbols in length.

8. The system of claim 4, wherein the number of symbols used for each block is determined by a frequency band, a bandwidth, and a channel condition.

9. The system of claim 4, wherein the length of the PCCH block in symbols is N_CP+N_FFT/2ⁿ symbols in length, where n is any positive integer greater than or equal to zero.

10. The system of claim 4, further comprising a wireless receiver to receive a second analog signal from another wireless backhaul system, to convert the second analog signal into a digital signal using al using a single-carrier block transmission scheme, and process the digital signal in order to extract a data stream from the digital signal.

11. The transmitter chain of claim 4, comprising:

a frame formatter to receive the data in bits and to format the bits into blocks of bits;

an forward error-checking (FEC) encoder to receive the radio frame from the frame formatter, to encode the radio frame to include the parity information, and to generate FEC blocks of bits;

a scrambler to receive the FEC blocks from the FEC encoder and to scramble the bits within each FEC block of the radio frame;

a symbol mapper to receive the scrambled FEC blocks from the scrambler and to map the bits of the scrambled FEC blocks to symbols forming the N PDCH blocks;

a CP block adder to receive the N PDCH blocks from the symbol mapper and to pre-append each PDCH block with a CP block thereby producing an extended PDCH block for each PDCH block;

a pilot signal and PCCH multiplexer to receive the N extended PDCH blocks from the CP block adder and to insert at least one PS block and a PCCH block into the radio frame, wherein the at least one PS block and the PCCH block are in symbol format and the combination of the extended PDCH blocks, the PCCH block and the at least one PS block form the radio frame;

a pulse shaping filter to receive the radio frame from the pilot block and PCCH multiplexer and to shape the pulses that comprise the radio frame; and

an interpolator and re-sampler to receive the radio frame from the pulse shaping filter and to convert the sample rate of the radio frame to a rate more favorable for a digital-to-analog convertor (DAC) component of an analog RF front-end.

12. The system of claim 4, wherein the wireless transceiver includes two transmitter chains with each transmitter chain generating a separate radio frame to be transmitted on a different polarization of the first analog signal.

13. The system of claim 4, wherein the wireless transceiver includes two transmitter chains with each transmitter chain generating a separate radio frame to be transmitted by a separate microwave antenna.

14. The system of claim 4, wherein the wireless transceiver includes four transmitter chains generating a separate radio frame.

15. The system of claim 4, wherein each transmitter chain uses the same PCCH.

16. The system of claim 4, wherein each transmitter chain uses a separate PCCH.

17. The system of claim 4, wherein each transmitter chain uses the same encoding method, code rate, and modulation order.

18. The system of claim 4, wherein each transmitter chain uses a different encoding method, code rate, and modulation order.

20. The transmitter of claim 16, wherein the CP block is a copy of the last N_CP symbols of the corresponding PDCH block and the PDCH block is N_FFT symbols in length.

21. The transmitter of claim 16, wherein the PS block is pre-appended with the CP so that the PS block is N_CP+N_FFT symbols in length and is used for signal recovery by a receiver.

22. The transmitter of claim 16, wherein the PCCH block is pre-appended with the CP so that the PCCH block is N_CP+N_FFT symbols in length and is used to relay operation and management information for a wireless backhaul system.

23. The transmitter of claim 16, wherein the number of symbols used by the pilot block, the PCCH block and the body frame is determined by a frequency band, a bandwidth, and a channel condition.

24. The transmitter of claim 16, wherein the PCCH block is N_CP+N_FFT/2ⁿ symbols in length, where n is any positive integer greater than or equal to zero.

5. A wireless backhaul system, comprising:

a wireless transceiver to receive a data stream in bit format;

a transmitter chain to convert the data stream into a digital radio frame, wherein the digital radio frame includes N physical data channel (PDCH) blocks with each PDCH block comprising a cyclic prefix (CP) pre-appended to a corresponding PDCH block, wherein the transmitter chain uses a single-carrier block transmission scheme; and

a radio frequency (RF) front end to convert the digital radio frame into a first analog signal and transmit the first analog signal.

19. A wireless backhaul transmitter, comprising:

a transmitter to produce and transmit a radio frame, the transmitter comprising;

a frame formatter to receive data in bits and to arrange the bits into data blocks of bits;

a forward error-checking (FEC) encoder to receive the data blocks of bits from the frame formatter, to encode the data blocks and to generate FEC blocks of bits for each data block of bits;

a scrambler to receive the FEC blocks from the spreader and to scramble the bits within each FEC block of the radio frame;

a symbol mapper to receive the FEC blocks from the scrambler and to map the bits of the FEC blocks to symbols to form N PDCH blocks;

a cyclic prefix (CP) adder to receive the radio frame from the symbol mapper and to pre-append each of the N PDCH blocks with a CP;

a pilot signal (PS) and physical control channel (PCCH) multiplexer to receive the N PDCH blocks from the CP adder and to combine at least one PS block and a PCCH block with the N PDCH blocks to form a radio frame;

a pulse shaping filter to receive the radio frame from the PS and PCCH multiplexer and to shape the pulses that comprise the radio frame;

an interpolator and re-sampler to receive the radio frame from the pulse shaping filter and to convert the sample rate of the radio frame to a rate more favorable for a digital-to-analog convertor (DAC) component of an analog RF front-end; and

the analog RF front-end to receive the radio frame from the interpolator and re-sampler, to convert the radio frame to an analog signal and to transmit the analog signal.