System and method for improved frequency/phase error tracking in high-speed high-frequency communication

Patent metadata

Field	Value
Publication number	US-9577863-B2
Application number	US-52293208-A
Country	US
Kind code	B2
Filing date	Jan 15, 2008
Priority date	Jan 16, 2007
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A single carrier modulation scheme suitable for use in high frequency communication systems is provided that achieves improved residual frequency error and phase noise estimation. At a transmitter, cyclically orthogonal constant amplitude pilot signals are inserted at the beginning (or end) of a plurality of SCBT blocks of a block coded data stream. At a receiver, a phase rotation of the received data stream is determined to remove a residual frequency error or to estimate the phase noise.

First claim

What is claimed is:

1. A method for providing improved frequency and phase error tracking in a high-speed high-frequency communication system, the method comprising:
performing encoding, interleaving and symbol mapping on a data stream of original information bits to produce a resulting data stream;
partitioning the resulting data stream into blocks to produce a partitioned data stream, wherein the partitioned data stream is a single-carrier block transmission (SCBT) partitioned data stream;
inserting a pilot sequence, distinct from a cyclic prefix, into at least two or more blocks of the partitioned data stream, wherein the pilot sequence is inserted into each of the at least two or more blocks at only one of the beginning of each block and the end of each block, and wherein the pilot sequence is a cyclically orthogonal constant-amplitude sequence; and
modulating and transmitting the partitioned data stream including the inserted pilot sequences using a single carrier modulation and transmission scheme.

2. The method according to claim 1 , further comprising:
receiving the data stream at a receiver;
determining a phase rotation of the received partitioned data stream by correlating at least a portion of the received data stream with a local copy of the pilot sequence;
estimating the frequency and phase error; and
correcting a frequency/phase error of the received partitioned data stream using the estimated frequency and phase error.

3. The method according to claim 1 , further comprising adding transmit redundancy to the partitioned data stream prior to transmitting the partitioned data stream.

4. The method according to claim 3 , wherein said transmit redundancy comprises the cyclic prefix.

5. The method according to claim 4 , wherein a length of said cyclic prefix is adaptively selected by a receiver.

6. The method according to claim 1 , wherein a length of the pilot sequence is substantially between 5% and 10% of the length of a given block of said partitioned data stream.

7. The method according to claim 1 , wherein said pilot sequence is also inserted at the beginning of each of said at least two blocks of said partitioned data stream when said inserting operation inserts the pilot sequence at the end of each of said at least two blocks.

8. The method according to claim 1 , wherein said pilot sequence is also inserted at the end of each of said at least two blocks of said partitioned data stream when said means for inserting inserts the pilot sequence at the beginning of each of said at least two blocks.

9. The method according to claim 1 , wherein said cyclically orthogonal constant-amplitude sequence is generated in accordance with the following equation:

P
⁡

(

n
=

p
+

N
*
q

)

=

ⅇ

j
⁡

(

2
⁢

⁢
π
⁢

⁢
r

N

⁢
pq

+
α

)

,

⁢

p
=
1

,
…
⁢

,
N

q
=
1

,
…
⁢

,
N

where r is prime to N, α is a phase offset factor, and N is an integer.

10. A data transmitter, comprising:
an encoder configured to encode a data stream of original information bits, which has been partitioned into blocks as a single-carrier block transmission (SCBT) partitioned data stream, into a coded data stream;
an interleaver configured to interleave the coded data stream, resulting in an interleaved data stream;
a symbol mapper configured to map symbols onto the interleaved data stream, resulting in a symbol-mapped data stream; and
a pilot inserter configured to insert a pilot sequence, distinct from a cyclic prefix, into at least two or more blocks of the symbol-mapped data stream, wherein the pilot sequence is inserted into each of the at least two or more blocks at only one of the beginning of each block and the end of each block, and wherein the pilot sequence is a cyclically orthogonal constant-amplitude sequence;
wherein the data transmitter is configured to modulate and transmit the symbol-mapped data stream including the inserted pilot sequences using a single carrier modulation and transmission scheme.

11. The data transmitter according to claim 10 , wherein transmit redundancy is added prior to transmitting the partitioned data stream.

12. The data transmitter according to claim 11 , wherein said transmit redundancy comprises the cyclic prefix.

13. The data transmitter according to claim 12 , wherein a length of said cyclic prefix is adaptively selected by a receiver.

14. The data transmitter according to claim 10 , wherein a length of the pilot sequence is substantially between 5% and 10% of the length of a given block of said partitioned data stream.

15. The data transmitter according to claim 10 , wherein said pilot sequence is also inserted at the beginning of each of said at least two blocks of said partitioned data stream when said means for inserting inserts the pilot sequence at the end of each of said at least two blocks.

16. The data transmitter according to claim 10 , wherein said pilot sequence is also inserted at the end of each of said at least two blocks of said partitioned data stream when said means for inserting inserts the pilot sequence at the beginning of each of said at least two blocks.

17. The data transmitter according to claim 10 , wherein said cyclically orthogonal constant-amplitude sequence is generated in accordance with the following equation:

P
⁡

Assignees

• Birru Dagnachew
• Seyedi-Esfahani Seyed-Alireza
• Koninklijke Philips Nv

Inventors

• Birru Dagnachew
• Seyedi-Esfahani Seyed-Alireza

Classifications

• H04L27/2657 Primary

  Carrier synchronisation · CPC title

• H04L27/2607

  Cyclic extensions · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04B1/62

  for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio · CPC title

• H04L27/2692

  with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver · CPC title