Dispensing with Channel Estimation: Differentially Modulated Cooperative Wireless Communications

作者：Wang Li^*; Hanzo Lajos

来源：IEEE Communications Surveys and Tutorials, 2012, 14(3): 836-857.

DOI：10.1109/SURV.2011.081611.00138

• Cooperative communications
• amplify-forward relaying
• decode-forward relaying
• cooperative resource allocation
• irregular channel coding
• IRCC codes
• AF cooperation
• DF cooperation
• near-capacity communications
• channel capacity
• wireless system capacity
• non-coherent detection
• multiple-symbol sphere detection
• EXIT charts
• wireless system design

As a benefit of bypassing the potentially excessive-complexity and yet inaccurate channel estimation, differentially encoded modulation in conjunction with low-complexity non-coherent detection constitutes a viable candidate for user-cooperative systems, where estimating all the links by the relays is unrealistic. In order to stimulate further research on differentially modulated cooperative systems, a number of fundamental challenges encountered in their practical implementations are addressed, including the time-variant-channel-induced performance erosion, flexible cooperative protocol designs, resource allocation as well as its high-spectral-efficiency transceiver design. Our investigations demonstrate the quantitative benefits of cooperative wireless networks both from a pure capacity perspective as well as from a practical system design perspective.

• 出版日期2012