Wireless communication method and apparatus for allocating training signals and information bits

A bit and signal technology, applied in the field of wireless communication and equipment for allocating training signals and information bits, can solve the problems of lack of adaptive allocation of training signals, inability to allocate information, damage, etc.

Inactive Publication Date: 2009-09-30
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 1) lack of adaptive allocation of training signals within a group; and
[0017] 2) Lack of adaptive allocation of information bits in the internal time-frequency channel plane of the packet
Transmitters in current UWB OFDM systems cannot adaptively allocate information-carrying data bits within packets according to communication channel changes or desired conditions
[0020] However, it is known that even during relatively short periods of t...

Method used

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  • Wireless communication method and apparatus for allocating training signals and information bits
  • Wireless communication method and apparatus for allocating training signals and information bits
  • Wireless communication method and apparatus for allocating training signals and information bits

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0087] 1. A transmitter comprising:

[0088] a scrambling unit configured to generate a scrambled physical layer service data unit (PSDU) frame;

[0089] a convolutional encoder configured to generate encoded and punctured bits based on the scrambled PSDU frame;

[0090] a bit interleaver configured to interleave the encoded and punctured bits;

[0091] a modulation mapper configured to map the interleaved bits to an appropriately selected mapping and generate mapped interleaved bits;

[0092] an Orthogonal Frequency Division Multiplexing (OFDM) modulator configured to modulate the mapped interleaved bits to produce OFDM-modulated output bits; and

[0093] a transmit antenna configured to transmit the OFDM-modulated output bits.

[0094] 2. The transmitter of embodiment 1, wherein the modulation mapper is a quadrature phase shift keying (QPSK) modulation mapper.

[0095] 3. The transmitter of embodiment 1, wherein the modulation mapper is a dual carrier modulation (DCM) ma...

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PUM

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Abstract

Techniques of channel correction and demodulation for orthogonal frequency division multiplexing (OFDM) systems are enhanced so that higher effective data rates and/or lower error rates can be achieved with a minimal processing load. Pilots are adaptively moved and/or removed, and their positions are changed, to enhance the channel estimation, decoding, and demodulation processes at the receiver. Reception is also enhanced by adding, removing, or changing the positions, of information-carrying data bits.

Description

Background technique [0001] Efficient demodulation of Orthogonal Frequency Division Multiplexed (OFDM) signals requires accurate and sufficient frequency characteristics of the time-frequency channel experienced by the signal. Once a channel is fully characterized, or equivalently, "estimated", the channel estimate can be used to maximize the effectiveness of the channel in optimally demodulating signals experiencing said channel. Typically, this process is called "channel equalization". [0002] In modern wireless communication systems, where OFDM is the modulation technique of choice, such as European Computer Manufacturers Association (ECMA)-368 Ultra Wideband (UWB) Personal Area Network (PAN) systems, channels are typically characterized by having two sets of signal to execute. The first signal is called the preamble, and its preamble signal synthesis is completely known to the receiver at all time and frequency samples comprising the preamble signal. The preamble is ty...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03
CPCH04W72/0453H04L5/0048H04L5/0007H04L1/0059H04L1/0041H04L1/0045H04W72/0413H04B1/7163H04B7/0413H04B7/0689H04W72/21
Inventor I·查P·R·季塔布
Owner INTERDIGITAL TECH CORP
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