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EGT-and MRC-based phase TCQ (trellis coded quantization) method for MISO (multiple input single output) wireless system

A wireless system, phase technology, applied in the direction of diversity/multi-antenna system, space transmit diversity, etc., can solve problems such as performance loss

Inactive Publication Date: 2013-04-03
NORTHWEST A & F UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited feedback rate, Quantization must be done before feedback, which will inevitably cause some performance penalty

Method used

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  • EGT-and MRC-based phase TCQ (trellis coded quantization) method for MISO (multiple input single output) wireless system
  • EGT-and MRC-based phase TCQ (trellis coded quantization) method for MISO (multiple input single output) wireless system
  • EGT-and MRC-based phase TCQ (trellis coded quantization) method for MISO (multiple input single output) wireless system

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with specific embodiments.

[0036] refer to figure 1 and figure 2 , the method for the phase TCQ quantification of the MISO wireless system based on EGT and MRC comprises the following steps:

[0037] Step 1): The transmitting end uses EGT to transmit beamforming, and the receiving end receives the transmitting beamforming.

[0038] Step 2): At the receiving end, the phase of the beamforming vector is quantized using an n-bit Trellis Quantization Coding (TCQ) quantizer. Due to the periodicity of the phase, we only need to quantize the phase of one cycle (the source symbol in the quantization process) .

[0039] Step 3): The receiving end feeds back the quantization result to the sending end.

[0040] In step 2), the specific flow of n-bit TCQ quantizer quantization phase:

[0041] 2.1) The codebook of the n-bit TCQ quantizer is divided into four subcodebooks, each subcodebook has N / 2 codewords...

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Abstract

The invention discloses an EGT-and MRC-based phase TCQ (trellis coded quantization) method for an MISO (multiple input single output) wireless system. The method is characterized by including the steps of firstly, a sending end sending beam forming by EGT, and a receiving end receiving the sent beam forming; secondly, quantifying a vector phase of beam forming by an n-bit TCQ quantizer; and thirdly, the receiving end feeding back quantization result to the sending end. The existing phase quantization technology includes SQ (scalar quantization) and VQ (vector quantization), an SQ method is simple but low in flexibility and performance, the VQ is higher in flexibility and performance than the SQ, the sending end and the receiving end require codebook storage, and design of high-dimensional VQ is difficult. The phase is quantified by TCQ, and the phase TCQ method is high in performance without codebook storage and is easy to implement.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and in particular to a method for phase TCQ quantization of a MISO wireless system based on EGT and MRC. The method quantizes the phase and feeds it back to the sender. Background technique [0002] In a use M t In a MISO wireless system with one transmitting antenna and one receiving antenna, each source symbol (a complex scalar) s at the transmitting end is sent to M t root antenna, where s ∈ C (C represents the set of complex numbers). For EGT beamforming, the source symbols s are rotated by different phases in different antennas. let x i (a complex scalar) is the output of the ith antenna, then here used to ensure that M t The overall power of the root antenna. The output of the transmitter can be a vector Represents, where (·)' represents the transpose of the vector. Assume w=e jθ ,but x = sw / ...

Claims

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Application Information

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IPC IPC(8): H04B7/06H04B7/08
Inventor 方勇罗婷婷
Owner NORTHWEST A & F UNIV
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